WIP / Hackathon: ODB over IPC #12
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Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
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Monday's version creates a This version takes care of most of the plumbing to have a daemon with thread pool and listening on IPC. Currently, the daemon just responds to the request by calling |
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Test t3206 failed on various CI runs because of the unsafe `oid_to_hex()` function. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Refactor worker thread and replace break/continue statements with explicit goto labels. This will simplify things as we add a keepalive-like feature. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Simplify the cleanup code in `worker_thread__wait_for_io_start()` and move the `close(fd)` to the caller. This will help us add a keepalive like feature in a later commit. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Refactor `worker_thread__do_io()` to let the caller close the fd. This will help us add a keepalive like feature in a later commit. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Refactor `worker_thread_proc()` and move our `SIMPLE_IPC_QUIT` handling outside of the loop. This will help us add a keepalive like feature in a later commit. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Teach `ipc-unix-socket` to keep a connection alive after the first request/response and accept a series of them. To maintain sync, each side must send a flush at the end of their message. This detail is hidden within the IPC layer. This extends the "Simple IPC" protocol in the spirit of keepalive. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Teach `ipc-win32` to keep a connection alive after the first request/response and accept a series of them. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Add `command_len` argument to the Simple IPC API. In my original Simple IPC API, I assumed that the request would always be a null-terminated string of text characters. The command arg was just a `const char *`. I found a caller that would like to pass a binary command to the daemon, so I want to ammend the Simple IPC API to take `const char *command, size_t command_len` and pass that to the daemon. (Really, the first arg should just be a `void *` or `const unsigned byte *` to make that clear, but I'm not going to bother right now.) Note, the response side has always been a `struct strbuf` which includes the buffer and length, so we already support returning a binary answer. (Yes, it feels a little weird returning a binary buffer in a `strbuf`, but it works.) Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
jeffhostetler
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May 18, 2021
real_ref was previously populated by dwim_ref(), which allocates new
memory. We need to make sure to free real_ref when discarding it.
(real_ref is already being freed at the end of create_branch() - but
if we discard it early then it will leak.)
This fixes the following leak found while running t0002-t0099:
Direct leak of 5 byte(s) in 1 object(s) allocated from:
#0 0x486954 in strdup /home/abuild/rpmbuild/BUILD/llvm-11.0.0.src/build/../projects/compiler-rt/lib/asan/asan_interceptors.cpp:452:3
#1 0xdd6484 in xstrdup wrapper.c:29:14
#2 0xc0f658 in expand_ref refs.c:671:12
#3 0xc0ecf1 in repo_dwim_ref refs.c:644:22
#4 0x8b1184 in dwim_ref ./refs.h:162:9
#5 0x8b0b02 in create_branch branch.c:284:10
#6 0x550cbb in update_refs_for_switch builtin/checkout.c:1046:4
#7 0x54e275 in switch_branches builtin/checkout.c:1274:2
#8 0x548828 in checkout_branch builtin/checkout.c:1668:9
#9 0x541306 in checkout_main builtin/checkout.c:2025:9
#10 0x5395fa in cmd_checkout builtin/checkout.c:2077:8
#11 0x4d02a8 in run_builtin git.c:467:11
#12 0x4cbfe9 in handle_builtin git.c:719:3
#13 0x4cf04f in run_argv git.c:808:4
git-for-windows#14 0x4cb85a in cmd_main git.c:939:19
git-for-windows#15 0x820cf6 in main common-main.c:52:11
git-for-windows#16 0x7f30bd9dd349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Signed-off-by: Andrzej Hunt <ajrhunt@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
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May 18, 2021
prefix_filename() returns newly allocated memory, and strbuf_addstr()
doesn't take ownership of its inputs. Therefore we have to make sure to
store and free prefix_filename()'s result.
As this leak is in cmd_bugreport(), we could just as well UNLEAK the
prefix - but there's no good reason not to just free it properly. This
leak was found while running t0091, see output below:
Direct leak of 24 byte(s) in 1 object(s) allocated from:
#0 0x49ab79 in realloc /home/abuild/rpmbuild/BUILD/llvm-11.0.0.src/build/../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0x9acc66 in xrealloc wrapper.c:126:8
#2 0x93baed in strbuf_grow strbuf.c:98:2
#3 0x93c6ea in strbuf_add strbuf.c:295:2
#4 0x69f162 in strbuf_addstr ./strbuf.h:304:2
#5 0x69f083 in prefix_filename abspath.c:277:2
#6 0x4fb275 in cmd_bugreport builtin/bugreport.c:146:9
#7 0x4cd91d in run_builtin git.c:467:11
#8 0x4cb5f3 in handle_builtin git.c:719:3
#9 0x4ccf47 in run_argv git.c:808:4
#10 0x4caf49 in cmd_main git.c:939:19
#11 0x69df9e in main common-main.c:52:11
#12 0x7f523a987349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Signed-off-by: Andrzej Hunt <ajrhunt@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
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May 18, 2021
parse_pathspec() allocates new memory into pathspec, therefore we need
to free it when we're done.
An UNLEAK would probably be just as good here - but clear_pathspec() is
not much more work so we might as well use it. check_ignore() is either
called once directly from cmd_check_ignore() (in which case the leak
really doesnt matter), or it can be called multiple times in a loop from
check_ignore_stdin_paths(), in which case we're potentially leaking
multiple times - but even in this scenario the leak is so small as to
have no real consequence.
Found while running t0008:
Direct leak of 112 byte(s) in 1 object(s) allocated from:
#0 0x49a85d in malloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0x9aca44 in do_xmalloc wrapper.c:41:8
#2 0x9aca1a in xmalloc wrapper.c:62:9
#3 0x873c17 in parse_pathspec pathspec.c:582:2
#4 0x503eb8 in check_ignore builtin/check-ignore.c:90:2
#5 0x5038af in cmd_check_ignore builtin/check-ignore.c:190:17
#6 0x4cd91d in run_builtin git.c:467:11
#7 0x4cb5f3 in handle_builtin git.c:719:3
#8 0x4ccf47 in run_argv git.c:808:4
#9 0x4caf49 in cmd_main git.c:939:19
#10 0x69e43e in main common-main.c:52:11
#11 0x7f18bb0dd349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 65 byte(s) in 1 object(s) allocated from:
#0 0x49ab79 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0x9acc46 in xrealloc wrapper.c:126:8
#2 0x93baed in strbuf_grow strbuf.c:98:2
#3 0x93d696 in strbuf_vaddf strbuf.c:392:3
#4 0x9400c6 in xstrvfmt strbuf.c:979:2
#5 0x940253 in xstrfmt strbuf.c:989:8
#6 0x92b72a in prefix_path_gently setup.c:115:15
#7 0x87442d in init_pathspec_item pathspec.c:439:11
#8 0x873cef in parse_pathspec pathspec.c:589:3
#9 0x503eb8 in check_ignore builtin/check-ignore.c:90:2
#10 0x5038af in cmd_check_ignore builtin/check-ignore.c:190:17
#11 0x4cd91d in run_builtin git.c:467:11
#12 0x4cb5f3 in handle_builtin git.c:719:3
#13 0x4ccf47 in run_argv git.c:808:4
git-for-windows#14 0x4caf49 in cmd_main git.c:939:19
git-for-windows#15 0x69e43e in main common-main.c:52:11
git-for-windows#16 0x7f18bb0dd349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 2 byte(s) in 1 object(s) allocated from:
#0 0x486834 in strdup ../projects/compiler-rt/lib/asan/asan_interceptors.cpp:452:3
#1 0x9ac9e8 in xstrdup wrapper.c:29:14
#2 0x874542 in init_pathspec_item pathspec.c:468:20
#3 0x873cef in parse_pathspec pathspec.c:589:3
#4 0x503eb8 in check_ignore builtin/check-ignore.c:90:2
#5 0x5038af in cmd_check_ignore builtin/check-ignore.c:190:17
#6 0x4cd91d in run_builtin git.c:467:11
#7 0x4cb5f3 in handle_builtin git.c:719:3
#8 0x4ccf47 in run_argv git.c:808:4
#9 0x4caf49 in cmd_main git.c:939:19
#10 0x69e43e in main common-main.c:52:11
#11 0x7f18bb0dd349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 179 byte(s) leaked in 3 allocation(s).
Signed-off-by: Andrzej Hunt <ajrhunt@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
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May 18, 2021
add_pending_object() populates rev.pending, we need to take care of
clearing it once we're done.
This code is run close to the end of a checkout, therefore this leak
seems like it would have very little impact. See also LSAN output
from t0020 below:
Direct leak of 2048 byte(s) in 1 object(s) allocated from:
#0 0x49ab79 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0x9acc46 in xrealloc wrapper.c:126:8
#2 0x83e3a3 in add_object_array_with_path object.c:337:3
#3 0x8f672a in add_pending_object_with_path revision.c:329:2
#4 0x8eaeab in add_pending_object_with_mode revision.c:336:2
#5 0x8eae9d in add_pending_object revision.c:342:2
#6 0x5154a0 in show_local_changes builtin/checkout.c:602:2
#7 0x513b00 in merge_working_tree builtin/checkout.c:979:3
#8 0x512cb3 in switch_branches builtin/checkout.c:1242:9
#9 0x50f8de in checkout_branch builtin/checkout.c:1646:9
#10 0x50ba12 in checkout_main builtin/checkout.c:2003:9
#11 0x5086c0 in cmd_checkout builtin/checkout.c:2055:8
#12 0x4cd91d in run_builtin git.c:467:11
#13 0x4cb5f3 in handle_builtin git.c:719:3
git-for-windows#14 0x4ccf47 in run_argv git.c:808:4
git-for-windows#15 0x4caf49 in cmd_main git.c:939:19
git-for-windows#16 0x69e43e in main common-main.c:52:11
git-for-windows#17 0x7f5dd1d50349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 2048 byte(s) leaked in 1 allocation(s).
Signed-off-by: Andrzej Hunt <ajrhunt@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
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May 18, 2021
mailinfo.p_hdr_info/s_hdr_info are null-terminated lists of strbuf's,
with entries pointing either to NULL or an allocated strbuf. Therefore
we need to free those strbuf's (and not just the data they contain)
whenever we're done with a given entry. (See handle_header() where those
new strbufs are malloc'd.)
Once we no longer need the list (and not just its entries) we can switch
over to strbuf_list_free() instead of manually iterating over the list,
which takes care of those additional details for us. We can only do this
in clear_mailinfo() - in handle_commit_message() we are only clearing the
array contents but want to reuse the array itself, hence we can't use
strbuf_list_free() there.
However, strbuf_list_free() cannot handle a NULL input, and the lists we
are freeing might be NULL. Therefore we add a NULL check in
strbuf_list_free() to make it safe to use with a NULL input (which is a
pattern used by some of the other *_free() functions around git).
Leak output from t0023:
Direct leak of 72 byte(s) in 3 object(s) allocated from:
#0 0x49a85d in malloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0x9ac9f4 in do_xmalloc wrapper.c:41:8
#2 0x9ac9ca in xmalloc wrapper.c:62:9
#3 0x7f6cf7 in handle_header mailinfo.c:205:10
#4 0x7f5abf in check_header mailinfo.c:583:4
#5 0x7f5524 in mailinfo mailinfo.c:1197:3
#6 0x4dcc95 in parse_mail builtin/am.c:1167:6
#7 0x4d9070 in am_run builtin/am.c:1732:12
#8 0x4d5b7a in cmd_am builtin/am.c:2398:3
#9 0x4cd91d in run_builtin git.c:467:11
#10 0x4cb5f3 in handle_builtin git.c:719:3
#11 0x4ccf47 in run_argv git.c:808:4
#12 0x4caf49 in cmd_main git.c:939:19
#13 0x69e43e in main common-main.c:52:11
git-for-windows#14 0x7fc1fadfa349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 72 byte(s) leaked in 3 allocation(s).
Signed-off-by: Andrzej Hunt <ajrhunt@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
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May 18, 2021
sorting might be a list allocated in ref_default_sorting() (in this case
it's a fixed single item list, which has nevertheless been xcalloc'd),
or it might be a list allocated in parse_opt_ref_sorting(). In either
case we could free these lists - but instead we UNLEAK as we're at the
end of cmd_for_each_ref. (There's no existing implementation of
clear_ref_sorting(), and writing a loop to free the list seems more
trouble than it's worth.)
filter.with_commit/no_commit are populated via
OPT_CONTAINS/OPT_NO_CONTAINS, both of which create new entries via
parse_opt_commits(), and also need to be free'd or UNLEAK'd. Because
free_commit_list() already exists, we choose to use that over an UNLEAK.
LSAN output from t0041:
Direct leak of 16 byte(s) in 1 object(s) allocated from:
#0 0x49a9d2 in calloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:154:3
#1 0x9ac252 in xcalloc wrapper.c:140:8
#2 0x8a4a55 in ref_default_sorting ref-filter.c:2486:32
#3 0x56c6b1 in cmd_for_each_ref builtin/for-each-ref.c:72:13
#4 0x4cd91d in run_builtin git.c:467:11
#5 0x4cb5f3 in handle_builtin git.c:719:3
#6 0x4ccf47 in run_argv git.c:808:4
#7 0x4caf49 in cmd_main git.c:939:19
#8 0x69dabe in main common-main.c:52:11
#9 0x7f2bdc570349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Direct leak of 16 byte(s) in 1 object(s) allocated from:
#0 0x49a85d in malloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0x9abf54 in do_xmalloc wrapper.c:41:8
#2 0x9abf2a in xmalloc wrapper.c:62:9
#3 0x717486 in commit_list_insert commit.c:540:33
#4 0x8644cf in parse_opt_commits parse-options-cb.c:98:2
#5 0x869bb5 in get_value parse-options.c:181:11
#6 0x8677dc in parse_long_opt parse-options.c:378:10
#7 0x8659bd in parse_options_step parse-options.c:817:11
#8 0x867fcd in parse_options parse-options.c:870:10
#9 0x56c62b in cmd_for_each_ref builtin/for-each-ref.c:59:2
#10 0x4cd91d in run_builtin git.c:467:11
#11 0x4cb5f3 in handle_builtin git.c:719:3
#12 0x4ccf47 in run_argv git.c:808:4
#13 0x4caf49 in cmd_main git.c:939:19
git-for-windows#14 0x69dabe in main common-main.c:52:11
git-for-windows#15 0x7f2bdc570349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Signed-off-by: Andrzej Hunt <ajrhunt@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
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May 18, 2021
parse_pathspec() populates pathspec, hence we need to clear it once it's
no longer needed. seen is xcalloc'd within the same function and
likewise needs to be freed once its no longer needed.
cmd_rm() has multiple early returns, therefore we need to clear or free
as soon as this data is no longer needed, as opposed to doing a cleanup
at the end.
LSAN output from t0020:
Direct leak of 112 byte(s) in 1 object(s) allocated from:
#0 0x49a85d in malloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0x9ac0a4 in do_xmalloc wrapper.c:41:8
#2 0x9ac07a in xmalloc wrapper.c:62:9
#3 0x873277 in parse_pathspec pathspec.c:582:2
#4 0x646ffa in cmd_rm builtin/rm.c:266:2
#5 0x4cd91d in run_builtin git.c:467:11
#6 0x4cb5f3 in handle_builtin git.c:719:3
#7 0x4ccf47 in run_argv git.c:808:4
#8 0x4caf49 in cmd_main git.c:939:19
#9 0x69dc0e in main common-main.c:52:11
#10 0x7f948825b349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 65 byte(s) in 1 object(s) allocated from:
#0 0x49ab79 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0x9ac2a6 in xrealloc wrapper.c:126:8
#2 0x93b14d in strbuf_grow strbuf.c:98:2
#3 0x93ccf6 in strbuf_vaddf strbuf.c:392:3
#4 0x93f726 in xstrvfmt strbuf.c:979:2
#5 0x93f8b3 in xstrfmt strbuf.c:989:8
#6 0x92ad8a in prefix_path_gently setup.c:115:15
#7 0x873a8d in init_pathspec_item pathspec.c:439:11
#8 0x87334f in parse_pathspec pathspec.c:589:3
#9 0x646ffa in cmd_rm builtin/rm.c:266:2
#10 0x4cd91d in run_builtin git.c:467:11
#11 0x4cb5f3 in handle_builtin git.c:719:3
#12 0x4ccf47 in run_argv git.c:808:4
#13 0x4caf49 in cmd_main git.c:939:19
git-for-windows#14 0x69dc0e in main common-main.c:52:11
git-for-windows#15 0x7f948825b349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 15 byte(s) in 1 object(s) allocated from:
#0 0x486834 in strdup ../projects/compiler-rt/lib/asan/asan_interceptors.cpp:452:3
#1 0x9ac048 in xstrdup wrapper.c:29:14
#2 0x873ba2 in init_pathspec_item pathspec.c:468:20
#3 0x87334f in parse_pathspec pathspec.c:589:3
#4 0x646ffa in cmd_rm builtin/rm.c:266:2
#5 0x4cd91d in run_builtin git.c:467:11
#6 0x4cb5f3 in handle_builtin git.c:719:3
#7 0x4ccf47 in run_argv git.c:808:4
#8 0x4caf49 in cmd_main git.c:939:19
#9 0x69dc0e in main common-main.c:52:11
#10 0x7f948825b349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Direct leak of 1 byte(s) in 1 object(s) allocated from:
#0 0x49a9d2 in calloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:154:3
#1 0x9ac392 in xcalloc wrapper.c:140:8
#2 0x647108 in cmd_rm builtin/rm.c:294:9
#3 0x4cd91d in run_builtin git.c:467:11
#4 0x4cb5f3 in handle_builtin git.c:719:3
#5 0x4ccf47 in run_argv git.c:808:4
#6 0x4caf49 in cmd_main git.c:939:19
#7 0x69dbfe in main common-main.c:52:11
#8 0x7f4fac1b0349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Signed-off-by: Andrzej Hunt <ajrhunt@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Aug 5, 2021
ibuf can be reused for multiple iterations of the loop. Specifically:
deflate() overwrites s.avail_in to show how much of the input buffer
has not been processed yet - and sometimes leaves 'avail_in > 0', in
which case ibuf will be processed again during the loop's subsequent
iteration.
But if we declare ibuf within the loop, then (in theory) we get a new
(and uninitialised) buffer for every iteration. In practice, my compiler
seems to resue the same buffer - meaning that this code does work - but
it doesn't seem safe to rely on this behaviour. MSAN correctly catches
this issue - as soon as we hit the 's.avail_in > 0' condition, we end up
reading from what seems to be uninitialised memory.
Therefore, we move ibuf out of the loop, making this reuse safe.
See MSAN output from t1050-large below - the interesting part is the
ibuf creation at the end, although there's a lot of indirection before
we reach the read from unitialised memory:
==11294==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x7f75db58fb1c in crc32_little crc32.c:283:9
#1 0x7f75db58d5b3 in crc32_z crc32.c:220:20
#2 0x7f75db59668c in crc32 crc32.c:242:12
#3 0x8c94f8 in hashwrite csum-file.c:101:15
#4 0x825faf in stream_to_pack bulk-checkin.c:154:5
#5 0x82467b in deflate_to_pack bulk-checkin.c:225:8
#6 0x823ff1 in index_bulk_checkin bulk-checkin.c:264:15
#7 0xa7cff2 in index_stream object-file.c:2234:9
#8 0xa7bff7 in index_fd object-file.c:2256:9
#9 0xa7d22d in index_path object-file.c:2274:7
#10 0xb3c8c9 in add_to_index read-cache.c:802:7
#11 0xb3e039 in add_file_to_index read-cache.c:835:9
#12 0x4a99c3 in add_files add.c:458:7
#13 0x4a7276 in cmd_add add.c:670:18
git-for-windows#14 0x4a1e76 in run_builtin git.c:461:11
git-for-windows#15 0x49e1e7 in handle_builtin git.c:714:3
git-for-windows#16 0x4a0c08 in run_argv git.c:781:4
git-for-windows#17 0x49d5a8 in cmd_main git.c:912:19
git-for-windows#18 0x7974da in main common-main.c:52:11
git-for-windows#19 0x7f75da66f349 in __libc_start_main (/lib64/libc.so.6+0x24349)
git-for-windows#20 0x421bd9 in _start start.S:120
Uninitialized value was stored to memory at
#0 0x7f75db58fa6b in crc32_little crc32.c:283:9
#1 0x7f75db58d5b3 in crc32_z crc32.c:220:20
#2 0x7f75db59668c in crc32 crc32.c:242:12
#3 0x8c94f8 in hashwrite csum-file.c:101:15
#4 0x825faf in stream_to_pack bulk-checkin.c:154:5
#5 0x82467b in deflate_to_pack bulk-checkin.c:225:8
#6 0x823ff1 in index_bulk_checkin bulk-checkin.c:264:15
#7 0xa7cff2 in index_stream object-file.c:2234:9
#8 0xa7bff7 in index_fd object-file.c:2256:9
#9 0xa7d22d in index_path object-file.c:2274:7
#10 0xb3c8c9 in add_to_index read-cache.c:802:7
#11 0xb3e039 in add_file_to_index read-cache.c:835:9
#12 0x4a99c3 in add_files add.c:458:7
#13 0x4a7276 in cmd_add add.c:670:18
git-for-windows#14 0x4a1e76 in run_builtin git.c:461:11
git-for-windows#15 0x49e1e7 in handle_builtin git.c:714:3
git-for-windows#16 0x4a0c08 in run_argv git.c:781:4
git-for-windows#17 0x49d5a8 in cmd_main git.c:912:19
git-for-windows#18 0x7974da in main common-main.c:52:11
git-for-windows#19 0x7f75da66f349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Uninitialized value was stored to memory at
#0 0x447eb9 in __msan_memcpy msan_interceptors.cpp:1558:3
#1 0x7f75db5c2011 in flush_pending deflate.c:746:5
#2 0x7f75db5cafa0 in deflate_stored deflate.c:1815:9
#3 0x7f75db5bb7d2 in deflate deflate.c:1005:34
#4 0xd80b7f in git_deflate zlib.c:244:12
#5 0x825dff in stream_to_pack bulk-checkin.c:140:12
#6 0x82467b in deflate_to_pack bulk-checkin.c:225:8
#7 0x823ff1 in index_bulk_checkin bulk-checkin.c:264:15
#8 0xa7cff2 in index_stream object-file.c:2234:9
#9 0xa7bff7 in index_fd object-file.c:2256:9
#10 0xa7d22d in index_path object-file.c:2274:7
#11 0xb3c8c9 in add_to_index read-cache.c:802:7
#12 0xb3e039 in add_file_to_index read-cache.c:835:9
#13 0x4a99c3 in add_files add.c:458:7
git-for-windows#14 0x4a7276 in cmd_add add.c:670:18
git-for-windows#15 0x4a1e76 in run_builtin git.c:461:11
git-for-windows#16 0x49e1e7 in handle_builtin git.c:714:3
git-for-windows#17 0x4a0c08 in run_argv git.c:781:4
git-for-windows#18 0x49d5a8 in cmd_main git.c:912:19
git-for-windows#19 0x7974da in main common-main.c:52:11
Uninitialized value was stored to memory at
#0 0x447eb9 in __msan_memcpy msan_interceptors.cpp:1558:3
#1 0x7f75db644241 in _tr_stored_block trees.c:873:5
#2 0x7f75db5cad7c in deflate_stored deflate.c:1813:9
#3 0x7f75db5bb7d2 in deflate deflate.c:1005:34
#4 0xd80b7f in git_deflate zlib.c:244:12
#5 0x825dff in stream_to_pack bulk-checkin.c:140:12
#6 0x82467b in deflate_to_pack bulk-checkin.c:225:8
#7 0x823ff1 in index_bulk_checkin bulk-checkin.c:264:15
#8 0xa7cff2 in index_stream object-file.c:2234:9
#9 0xa7bff7 in index_fd object-file.c:2256:9
#10 0xa7d22d in index_path object-file.c:2274:7
#11 0xb3c8c9 in add_to_index read-cache.c:802:7
#12 0xb3e039 in add_file_to_index read-cache.c:835:9
#13 0x4a99c3 in add_files add.c:458:7
git-for-windows#14 0x4a7276 in cmd_add add.c:670:18
git-for-windows#15 0x4a1e76 in run_builtin git.c:461:11
git-for-windows#16 0x49e1e7 in handle_builtin git.c:714:3
git-for-windows#17 0x4a0c08 in run_argv git.c:781:4
git-for-windows#18 0x49d5a8 in cmd_main git.c:912:19
git-for-windows#19 0x7974da in main common-main.c:52:11
Uninitialized value was stored to memory at
#0 0x447eb9 in __msan_memcpy msan_interceptors.cpp:1558:3
#1 0x7f75db5c8fcf in deflate_stored deflate.c:1783:9
#2 0x7f75db5bb7d2 in deflate deflate.c:1005:34
#3 0xd80b7f in git_deflate zlib.c:244:12
#4 0x825dff in stream_to_pack bulk-checkin.c:140:12
#5 0x82467b in deflate_to_pack bulk-checkin.c:225:8
#6 0x823ff1 in index_bulk_checkin bulk-checkin.c:264:15
#7 0xa7cff2 in index_stream object-file.c:2234:9
#8 0xa7bff7 in index_fd object-file.c:2256:9
#9 0xa7d22d in index_path object-file.c:2274:7
#10 0xb3c8c9 in add_to_index read-cache.c:802:7
#11 0xb3e039 in add_file_to_index read-cache.c:835:9
#12 0x4a99c3 in add_files add.c:458:7
#13 0x4a7276 in cmd_add add.c:670:18
git-for-windows#14 0x4a1e76 in run_builtin git.c:461:11
git-for-windows#15 0x49e1e7 in handle_builtin git.c:714:3
git-for-windows#16 0x4a0c08 in run_argv git.c:781:4
git-for-windows#17 0x49d5a8 in cmd_main git.c:912:19
git-for-windows#18 0x7974da in main common-main.c:52:11
git-for-windows#19 0x7f75da66f349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Uninitialized value was stored to memory at
#0 0x447eb9 in __msan_memcpy msan_interceptors.cpp:1558:3
#1 0x7f75db5ea545 in read_buf deflate.c:1181:5
#2 0x7f75db5c97f7 in deflate_stored deflate.c:1791:9
#3 0x7f75db5bb7d2 in deflate deflate.c:1005:34
#4 0xd80b7f in git_deflate zlib.c:244:12
#5 0x825dff in stream_to_pack bulk-checkin.c:140:12
#6 0x82467b in deflate_to_pack bulk-checkin.c:225:8
#7 0x823ff1 in index_bulk_checkin bulk-checkin.c:264:15
#8 0xa7cff2 in index_stream object-file.c:2234:9
#9 0xa7bff7 in index_fd object-file.c:2256:9
#10 0xa7d22d in index_path object-file.c:2274:7
#11 0xb3c8c9 in add_to_index read-cache.c:802:7
#12 0xb3e039 in add_file_to_index read-cache.c:835:9
#13 0x4a99c3 in add_files add.c:458:7
git-for-windows#14 0x4a7276 in cmd_add add.c:670:18
git-for-windows#15 0x4a1e76 in run_builtin git.c:461:11
git-for-windows#16 0x49e1e7 in handle_builtin git.c:714:3
git-for-windows#17 0x4a0c08 in run_argv git.c:781:4
git-for-windows#18 0x49d5a8 in cmd_main git.c:912:19
git-for-windows#19 0x7974da in main common-main.c:52:11
Uninitialized value was created by an allocation of 'ibuf' in the stack frame of function 'stream_to_pack'
#0 0x825710 in stream_to_pack bulk-checkin.c:101
SUMMARY: MemorySanitizer: use-of-uninitialized-value crc32.c:283:9 in crc32_little
Exiting
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Aug 5, 2021
cache_entry contains an object_id, and compare_ce_content() would
include that field when calling memcmp on a subset of the cache_entry.
Depending on which hashing algorithm is being used, only part of
object_id.hash is actually being used, therefore including it in a
memcmp() is incorrect. Instead we choose to exclude the object_id when
calling memcmp(), and call oideq() separately.
This issue was found when running t1700-split-index with MSAN, see MSAN
output below (on my machine, offset 76 corresponds to 4 bytes after the
start of object_id.hash).
Uninitialized bytes in MemcmpInterceptorCommon at offset 76 inside [0x7f60e7c00118, 92)
==27914==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x4524ee in memcmp /home/abuild/rpmbuild/BUILD/llvm-11.0.0.src/build/../projects/compiler-rt/lib/msan/../sanitizer_common/sanitizer_common_interceptors.inc:873:10
#1 0xc867ae in compare_ce_content /home/ahunt/git/git/split-index.c:208:8
#2 0xc859fb in prepare_to_write_split_index /home/ahunt/git/git/split-index.c:336:9
#3 0xb4bbca in write_split_index /home/ahunt/git/git/read-cache.c:3107:2
#4 0xb42b4d in write_locked_index /home/ahunt/git/git/read-cache.c:3295:8
#5 0x638058 in try_merge_strategy /home/ahunt/git/git/builtin/merge.c:758:7
#6 0x63057f in cmd_merge /home/ahunt/git/git/builtin/merge.c:1663:9
#7 0x4a1e76 in run_builtin /home/ahunt/git/git/git.c:461:11
#8 0x49e1e7 in handle_builtin /home/ahunt/git/git/git.c:714:3
#9 0x4a0c08 in run_argv /home/ahunt/git/git/git.c:781:4
#10 0x49d5a8 in cmd_main /home/ahunt/git/git/git.c:912:19
#11 0x7974da in main /home/ahunt/git/git/common-main.c:52:11
#12 0x7f60e928e349 in __libc_start_main (/lib64/libc.so.6+0x24349)
#13 0x421bd9 in _start /home/abuild/rpmbuild/BUILD/glibc-2.26/csu/../sysdeps/x86_64/start.S:120
Uninitialized value was stored to memory at
#0 0x447eb9 in __msan_memcpy /home/abuild/rpmbuild/BUILD/llvm-11.0.0.src/build/../projects/compiler-rt/lib/msan/msan_interceptors.cpp:1558:3
#1 0xb4d1e6 in dup_cache_entry /home/ahunt/git/git/read-cache.c:3457:2
#2 0xd214fa in add_entry /home/ahunt/git/git/unpack-trees.c:215:18
#3 0xd1fae0 in keep_entry /home/ahunt/git/git/unpack-trees.c:2276:2
#4 0xd1ff9e in twoway_merge /home/ahunt/git/git/unpack-trees.c:2504:11
#5 0xd27028 in call_unpack_fn /home/ahunt/git/git/unpack-trees.c:593:12
#6 0xd2443d in unpack_nondirectories /home/ahunt/git/git/unpack-trees.c:1106:12
#7 0xd19435 in unpack_callback /home/ahunt/git/git/unpack-trees.c:1306:6
#8 0xd0d7ff in traverse_trees /home/ahunt/git/git/tree-walk.c:532:17
#9 0xd1773a in unpack_trees /home/ahunt/git/git/unpack-trees.c:1683:9
#10 0xdc6370 in checkout /home/ahunt/git/git/merge-ort.c:3590:8
#11 0xdc51c3 in merge_switch_to_result /home/ahunt/git/git/merge-ort.c:3728:7
#12 0xa195a9 in merge_ort_recursive /home/ahunt/git/git/merge-ort-wrappers.c:58:2
#13 0x637fff in try_merge_strategy /home/ahunt/git/git/builtin/merge.c:751:12
git-for-windows#14 0x63057f in cmd_merge /home/ahunt/git/git/builtin/merge.c:1663:9
git-for-windows#15 0x4a1e76 in run_builtin /home/ahunt/git/git/git.c:461:11
git-for-windows#16 0x49e1e7 in handle_builtin /home/ahunt/git/git/git.c:714:3
git-for-windows#17 0x4a0c08 in run_argv /home/ahunt/git/git/git.c:781:4
git-for-windows#18 0x49d5a8 in cmd_main /home/ahunt/git/git/git.c:912:19
git-for-windows#19 0x7974da in main /home/ahunt/git/git/common-main.c:52:11
Uninitialized value was created by a heap allocation
#0 0x44e73d in malloc /home/abuild/rpmbuild/BUILD/llvm-11.0.0.src/build/../projects/compiler-rt/lib/msan/msan_interceptors.cpp:901:3
#1 0xd592f6 in do_xmalloc /home/ahunt/git/git/wrapper.c:41:8
#2 0xd59248 in xmalloc /home/ahunt/git/git/wrapper.c:62:9
#3 0xa17088 in mem_pool_alloc_block /home/ahunt/git/git/mem-pool.c:22:6
#4 0xa16f78 in mem_pool_init /home/ahunt/git/git/mem-pool.c:44:3
#5 0xb481b8 in load_all_cache_entries /home/ahunt/git/git/read-cache.c
#6 0xb44d40 in do_read_index /home/ahunt/git/git/read-cache.c:2298:17
#7 0xb48a1b in read_index_from /home/ahunt/git/git/read-cache.c:2389:8
#8 0xbd5a0b in repo_read_index /home/ahunt/git/git/repository.c:276:8
#9 0xb4bcaf in repo_read_index_unmerged /home/ahunt/git/git/read-cache.c:3326:2
#10 0x62ed26 in cmd_merge /home/ahunt/git/git/builtin/merge.c:1362:6
#11 0x4a1e76 in run_builtin /home/ahunt/git/git/git.c:461:11
#12 0x49e1e7 in handle_builtin /home/ahunt/git/git/git.c:714:3
#13 0x4a0c08 in run_argv /home/ahunt/git/git/git.c:781:4
git-for-windows#14 0x49d5a8 in cmd_main /home/ahunt/git/git/git.c:912:19
git-for-windows#15 0x7974da in main /home/ahunt/git/git/common-main.c:52:11
git-for-windows#16 0x7f60e928e349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: MemorySanitizer: use-of-uninitialized-value /home/abuild/rpmbuild/BUILD/llvm-11.0.0.src/build/../projects/compiler-rt/lib/msan/../sanitizer_common/sanitizer_common_interceptors.inc:873:10 in memcmp
Exiting
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Aug 5, 2021
…ints
report_result() sends a struct to the parent process, but that struct
would contain uninitialised padding bytes. Running this code under MSAN
rightly triggers a warning - but we don't particularly care about this
warning because we control the receiving code, and we therefore know
that those padding bytes won't be read on the receiving end.
We could simply suppress this warning under MSAN with the approporiate
ifdef'd attributes, but a less intrusive solution is to 0-initialise the
struct, which guarantees that the padding will also be initialised.
Interestingly, in the error-case branch, we only try to copy the first
two members of pc_item_result, by copying only PC_ITEM_RESULT_BASE_SIZE
bytes. However PC_ITEM_RESULT_BASE_SIZE is defined as
'offsetof(the_last_member)', which means that we're copying padding bytes
after the end of the second last member. We could avoid doing this by
redefining PC_ITEM_RESULT_BASE_SIZE as
'offsetof(second_last_member) + sizeof(second_last_member)', but there's
no huge benefit to doing so (and this patch silences the MSAN warning in
this scenario either way).
MSAN output from t2080 (partially interleaved due to the
parallel work :) ):
Uninitialized bytes in __interceptor_write at offset 12 inside [0x7fff37d83408, 160)
==23279==WARNING: MemorySanitizer: use-of-uninitialized-value
Uninitialized bytes in __interceptor_write at offset 12 inside [0x7ffdb8a07ec8, 160)
==23280==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0xd5ac28 in xwrite /home/ahunt/git/git/wrapper.c:256:8
#1 0xd5b327 in write_in_full /home/ahunt/git/git/wrapper.c:311:21
#2 0xb0a8c4 in do_packet_write /home/ahunt/git/git/pkt-line.c:221:6
#3 0xb0a5fd in packet_write /home/ahunt/git/git/pkt-line.c:242:6
#4 0x4f7441 in report_result /home/ahunt/git/git/builtin/checkout--worker.c:69:2
#5 0x4f6be6 in worker_loop /home/ahunt/git/git/builtin/checkout--worker.c:100:3
#6 0x4f68d3 in cmd_checkout__worker /home/ahunt/git/git/builtin/checkout--worker.c:143:2
#7 0x4a1e76 in run_builtin /home/ahunt/git/git/git.c:461:11
#8 0x49e1e7 in handle_builtin /home/ahunt/git/git/git.c:714:3
#9 0x4a0c08 in run_argv /home/ahunt/git/git/git.c:781:4
#10 0x49d5a8 in cmd_main /home/ahunt/git/git/git.c:912:19
#11 0x7974da in main /home/ahunt/git/git/common-main.c:52:11
#12 0x7f8778114349 in __libc_start_main (/lib64/libc.so.6+0x24349)
#13 0x421bd9 in _start /home/abuild/rpmbuild/BUILD/glibc-2.26/csu/../sysdeps/x86_64/start.S:120
Uninitialized value was created by an allocation of 'res' in the stack frame of function 'report_result'
#0 0x4f72c0 in report_result /home/ahunt/git/git/builtin/checkout--worker.c:55
SUMMARY: MemorySanitizer: use-of-uninitialized-value /home/ahunt/git/git/wrapper.c:256:8 in xwrite
Exiting
#0 0xd5ac28 in xwrite /home/ahunt/git/git/wrapper.c:256:8
#1 0xd5b327 in write_in_full /home/ahunt/git/git/wrapper.c:311:21
#2 0xb0a8c4 in do_packet_write /home/ahunt/git/git/pkt-line.c:221:6
#3 0xb0a5fd in packet_write /home/ahunt/git/git/pkt-line.c:242:6
#4 0x4f7441 in report_result /home/ahunt/git/git/builtin/checkout--worker.c:69:2
#5 0x4f6be6 in worker_loop /home/ahunt/git/git/builtin/checkout--worker.c:100:3
#6 0x4f68d3 in cmd_checkout__worker /home/ahunt/git/git/builtin/checkout--worker.c:143:2
#7 0x4a1e76 in run_builtin /home/ahunt/git/git/git.c:461:11
#8 0x49e1e7 in handle_builtin /home/ahunt/git/git/git.c:714:3
#9 0x4a0c08 in run_argv /home/ahunt/git/git/git.c:781:4
#10 0x49d5a8 in cmd_main /home/ahunt/git/git/git.c:912:19
#11 0x7974da in main /home/ahunt/git/git/common-main.c:52:11
#12 0x7f2749a0e349 in __libc_start_main (/lib64/libc.so.6+0x24349)
#13 0x421bd9 in _start /home/abuild/rpmbuild/BUILD/glibc-2.26/csu/../sysdeps/x86_64/start.S:120
Uninitialized value was created by an allocation of 'res' in the stack frame of function 'report_result'
#0 0x4f72c0 in report_result /home/ahunt/git/git/builtin/checkout--worker.c:55
SUMMARY: MemorySanitizer: use-of-uninitialized-value /home/ahunt/git/git/wrapper.c:256:8 in xwrite
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Aug 17, 2021
origin starts off pointing to somewhere within line, which is owned by
the caller. Later we might allocate a new string using xmemdupz() or
xstrfmt(). To avoid leaking these new strings, we introduce a to_free
pointer - which allows us to safely free the newly allocated string when
we're done (we cannot just free origin directly as it might still be
pointing to line).
LSAN output from t0090:
Direct leak of 8 byte(s) in 1 object(s) allocated from:
#0 0x49a82d in malloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0xa71f49 in do_xmalloc wrapper.c:41:8
#2 0xa720b0 in do_xmallocz wrapper.c:75:8
#3 0xa720b0 in xmallocz wrapper.c:83:9
#4 0xa720b0 in xmemdupz wrapper.c:99:16
#5 0x8092ba in handle_line fmt-merge-msg.c:187:23
#6 0x8092ba in fmt_merge_msg fmt-merge-msg.c:666:7
#7 0x5ce2e6 in prepare_merge_message builtin/merge.c:1119:2
#8 0x5ce2e6 in collect_parents builtin/merge.c:1215:3
#9 0x5c9c1e in cmd_merge builtin/merge.c:1454:16
#10 0x4ce83e in run_builtin git.c:475:11
#11 0x4ccafe in handle_builtin git.c:729:3
#12 0x4cb01c in run_argv git.c:818:4
#13 0x4cb01c in cmd_main git.c:949:19
git-for-windows#14 0x6b3fad in main common-main.c:52:11
git-for-windows#15 0x7fb929620349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 8 byte(s) leaked in 1 allocation(s).
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Aug 17, 2021
realpath is only populated if we execute the git_work_tree_initialized
block. However that block also causes us to return early, meaning we
never actually release the strbuf in the case where we populated it.
Therefore we move all strbuf related code into the block to guarantee
that we can't leak it.
LSAN output from t0095:
Direct leak of 129 byte(s) in 1 object(s) allocated from:
#0 0x49a9b9 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0x78f585 in xrealloc wrapper.c:126:8
#2 0x713ff4 in strbuf_grow strbuf.c:98:2
#3 0x713ff4 in strbuf_getcwd strbuf.c:597:3
#4 0x4f0c18 in strbuf_realpath_1 abspath.c:99:7
#5 0x5ae4a4 in set_git_work_tree environment.c:259:3
#6 0x6fdd8a in setup_discovered_git_dir setup.c:931:2
#7 0x6fdd8a in setup_git_directory_gently setup.c:1235:12
#8 0x4cb50d in get_bloom_filter_for_commit t/helper/test-bloom.c:41:2
#9 0x4cb50d in cmd__bloom t/helper/test-bloom.c:95:3
#10 0x4caa1f in cmd_main t/helper/test-tool.c:124:11
#11 0x4caded in main common-main.c:52:11
#12 0x7f0869f02349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 129 byte(s) leaked in 1 allocation(s).
It looks like this leak has existed since realpath was first added to
set_git_work_tree() in:
3d7747e (real_path: remove unsafe API, 2020-03-10)
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
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Aug 17, 2021
relative_url() populates sb. In the normal return path, its buffer is
detached using strbuf_detach(). However the early return path does
nothing with sb, which means that sb's memory is leaked - therefore
we add a release to avoid this leak.
The reset is also only necessary for the normal return path, hence we
move it down to after the early-return to avoid unnecessary work.
LSAN output from t0060:
Direct leak of 121 byte(s) in 1 object(s) allocated from:
#0 0x7f31246f28b0 in realloc (/usr/lib64/libasan.so.4+0xdc8b0)
#1 0x98d7d6 in xrealloc wrapper.c:126
#2 0x909a60 in strbuf_grow strbuf.c:98
#3 0x90bf00 in strbuf_vaddf strbuf.c:401
#4 0x90c321 in strbuf_addf strbuf.c:335
#5 0x5cb78d in relative_url builtin/submodule--helper.c:182
#6 0x5cbe46 in resolve_relative_url_test builtin/submodule--helper.c:248
#7 0x410dcd in run_builtin git.c:475
#8 0x410dcd in handle_builtin git.c:729
#9 0x414087 in run_argv git.c:818
#10 0x414087 in cmd_main git.c:949
#11 0x40e9ec in main common-main.c:52
#12 0x7f3123c41349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 121 byte(s) leaked in 1 allocation(s).
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
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Aug 17, 2021
old_dir/new_dir are free()'d at the end of update_dir_rename_counts, however if we return early we'll never free those strings. Therefore we should move all new allocations after the possible early return, avoiding a leak. This seems like a fairly recent leak, that started happening since the early-return was added in: 1ad69eb (diffcore-rename: compute dir_rename_counts in stages, 2021-02-27) LSAN output from t0022: Direct leak of 7 byte(s) in 1 object(s) allocated from: #0 0x486804 in strdup ../projects/compiler-rt/lib/asan/asan_interceptors.cpp:452:3 #1 0xa71e48 in xstrdup wrapper.c:29:14 #2 0x7db9c7 in update_dir_rename_counts diffcore-rename.c:464:12 #3 0x7db6ae in find_renames diffcore-rename.c:1062:3 #4 0x7d76c3 in diffcore_rename_extended diffcore-rename.c:1472:18 #5 0x7b4cfc in diffcore_std diff.c:6705:4 #6 0x855e46 in log_tree_diff_flush log-tree.c:846:2 #7 0x856574 in log_tree_diff log-tree.c:955:3 #8 0x856574 in log_tree_commit log-tree.c:986:10 #9 0x9a9c67 in print_commit_summary sequencer.c:1329:7 #10 0x52e623 in cmd_commit builtin/commit.c:1862:3 #11 0x4ce83e in run_builtin git.c:475:11 #12 0x4ccafe in handle_builtin git.c:729:3 #13 0x4cb01c in run_argv git.c:818:4 git-for-windows#14 0x4cb01c in cmd_main git.c:949:19 git-for-windows#15 0x6b3f3d in main common-main.c:52:11 git-for-windows#16 0x7fe397c7a349 in __libc_start_main (/lib64/libc.so.6+0x24349) Direct leak of 7 byte(s) in 1 object(s) allocated from: #0 0x486804 in strdup ../projects/compiler-rt/lib/asan/asan_interceptors.cpp:452:3 #1 0xa71e48 in xstrdup wrapper.c:29:14 #2 0x7db9bc in update_dir_rename_counts diffcore-rename.c:463:12 #3 0x7db6ae in find_renames diffcore-rename.c:1062:3 #4 0x7d76c3 in diffcore_rename_extended diffcore-rename.c:1472:18 #5 0x7b4cfc in diffcore_std diff.c:6705:4 #6 0x855e46 in log_tree_diff_flush log-tree.c:846:2 #7 0x856574 in log_tree_diff log-tree.c:955:3 #8 0x856574 in log_tree_commit log-tree.c:986:10 #9 0x9a9c67 in print_commit_summary sequencer.c:1329:7 #10 0x52e623 in cmd_commit builtin/commit.c:1862:3 #11 0x4ce83e in run_builtin git.c:475:11 #12 0x4ccafe in handle_builtin git.c:729:3 #13 0x4cb01c in run_argv git.c:818:4 git-for-windows#14 0x4cb01c in cmd_main git.c:949:19 git-for-windows#15 0x6b3f3d in main common-main.c:52:11 git-for-windows#16 0x7fe397c7a349 in __libc_start_main (/lib64/libc.so.6+0x24349) SUMMARY: AddressSanitizer: 14 byte(s) leaked in 2 allocation(s). Signed-off-by: Andrzej Hunt <andrzej@ahunt.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
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Aug 17, 2021
u.head is populated using resolve_refdup(), which returns a newly
allocated string - hence we also need to free() it.
Found while running t0041 with LSAN:
Direct leak of 16 byte(s) in 1 object(s) allocated from:
#0 0x486804 in strdup ../projects/compiler-rt/lib/asan/asan_interceptors.cpp:452:3
#1 0xa8be98 in xstrdup wrapper.c:29:14
#2 0x9481db in head_atom_parser ref-filter.c:549:17
#3 0x9408c7 in parse_ref_filter_atom ref-filter.c:703:30
#4 0x9400e3 in verify_ref_format ref-filter.c:974:8
#5 0x4f9e8b in print_ref_list builtin/branch.c:439:6
#6 0x4f9e8b in cmd_branch builtin/branch.c:757:3
#7 0x4ce83e in run_builtin git.c:475:11
#8 0x4ccafe in handle_builtin git.c:729:3
#9 0x4cb01c in run_argv git.c:818:4
#10 0x4cb01c in cmd_main git.c:949:19
#11 0x6bdc2d in main common-main.c:52:11
#12 0x7f96edf86349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 16 byte(s) leaked in 1 allocation(s).
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
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Aug 17, 2021
repo_diff_setup() calls through to diff.c's static prep_parse_options(),
which in turn allocates a new array into diff_opts.parseopts.
diff_setup_done() is responsible for freeing that array, and has the
benefit of verifying diff_opts too - hence we add a call to
diff_setup_done() to avoid leaking parseopts.
Output from the leak as found while running t0090 with LSAN:
Direct leak of 7120 byte(s) in 1 object(s) allocated from:
#0 0x49a82d in malloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0xa8bf89 in do_xmalloc wrapper.c:41:8
#2 0x7a7bae in prep_parse_options diff.c:5636:2
#3 0x7a7bae in repo_diff_setup diff.c:4611:2
#4 0x93716c in repo_index_has_changes read-cache.c:2518:3
#5 0x872233 in unclean merge-ort-wrappers.c:12:14
#6 0x872233 in merge_ort_recursive merge-ort-wrappers.c:53:6
#7 0x5d5b11 in try_merge_strategy builtin/merge.c:752:12
#8 0x5d0b6b in cmd_merge builtin/merge.c:1666:9
#9 0x4ce83e in run_builtin git.c:475:11
#10 0x4ccafe in handle_builtin git.c:729:3
#11 0x4cb01c in run_argv git.c:818:4
#12 0x4cb01c in cmd_main git.c:949:19
#13 0x6bdc2d in main common-main.c:52:11
git-for-windows#14 0x7f551eb51349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 7120 byte(s) leaked in 1 allocation(s)
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
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that referenced
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Aug 17, 2021
apply_multi_file_filter and async_query_available_blobs both query
subprocess output using subprocess_read_status, which writes data into
the identically named filter_status strbuf. We add a strbuf_release to
avoid leaking their contents.
Leak output seen when running t0021 with LSAN:
Direct leak of 24 byte(s) in 1 object(s) allocated from:
#0 0x49ab49 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0xa8c2b5 in xrealloc wrapper.c:126:8
#2 0x9ff99d in strbuf_grow strbuf.c:98:2
#3 0x9ff99d in strbuf_addbuf strbuf.c:304:2
#4 0xa101d6 in subprocess_read_status sub-process.c:45:5
#5 0x77793c in apply_multi_file_filter convert.c:886:8
#6 0x77793c in apply_filter convert.c:1042:10
#7 0x77a0b5 in convert_to_git_filter_fd convert.c:1492:7
#8 0x8b48cd in index_stream_convert_blob object-file.c:2156:2
#9 0x8b48cd in index_fd object-file.c:2248:9
#10 0x597411 in hash_fd builtin/hash-object.c:43:9
#11 0x596be1 in hash_object builtin/hash-object.c:59:2
#12 0x596be1 in cmd_hash_object builtin/hash-object.c:153:3
#13 0x4ce83e in run_builtin git.c:475:11
git-for-windows#14 0x4ccafe in handle_builtin git.c:729:3
git-for-windows#15 0x4cb01c in run_argv git.c:818:4
git-for-windows#16 0x4cb01c in cmd_main git.c:949:19
git-for-windows#17 0x6bdc2d in main common-main.c:52:11
git-for-windows#18 0x7f42acf79349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 24 byte(s) leaked in 1 allocation(s).
Direct leak of 120 byte(s) in 5 object(s) allocated from:
#0 0x49ab49 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0xa8c295 in xrealloc wrapper.c:126:8
#2 0x9ff97d in strbuf_grow strbuf.c:98:2
#3 0x9ff97d in strbuf_addbuf strbuf.c:304:2
#4 0xa101b6 in subprocess_read_status sub-process.c:45:5
#5 0x775c73 in async_query_available_blobs convert.c:960:8
#6 0x80029d in finish_delayed_checkout entry.c:183:9
#7 0xa65d1e in check_updates unpack-trees.c:493:10
#8 0xa5f469 in unpack_trees unpack-trees.c:1747:8
#9 0x525971 in checkout builtin/clone.c:815:6
#10 0x525971 in cmd_clone builtin/clone.c:1409:8
#11 0x4ce83e in run_builtin git.c:475:11
#12 0x4ccafe in handle_builtin git.c:729:3
#13 0x4cb01c in run_argv git.c:818:4
git-for-windows#14 0x4cb01c in cmd_main git.c:949:19
git-for-windows#15 0x6bdc2d in main common-main.c:52:11
git-for-windows#16 0x7fa253fce349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 120 byte(s) leaked in 5 allocation(s).
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
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Aug 17, 2021
These leaks all happen at the end of cmd_mv, hence don't matter in any
way. But we still fix the easy ones and squash the rest to get us closer
to being able to run tests without leaks.
LSAN output from t0050:
Direct leak of 384 byte(s) in 1 object(s) allocated from:
#0 0x49ab49 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0xa8c015 in xrealloc wrapper.c:126:8
#2 0xa0a7e1 in add_entry string-list.c:44:2
#3 0xa0a7e1 in string_list_insert string-list.c:58:14
#4 0x5dac03 in cmd_mv builtin/mv.c:248:4
#5 0x4ce83e in run_builtin git.c:475:11
#6 0x4ccafe in handle_builtin git.c:729:3
#7 0x4cb01c in run_argv git.c:818:4
#8 0x4cb01c in cmd_main git.c:949:19
#9 0x6bd9ad in main common-main.c:52:11
#10 0x7fbfeffc4349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Direct leak of 16 byte(s) in 1 object(s) allocated from:
#0 0x49a82d in malloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0xa8bd09 in do_xmalloc wrapper.c:41:8
#2 0x5dbc34 in internal_prefix_pathspec builtin/mv.c:32:2
#3 0x5da575 in cmd_mv builtin/mv.c:158:14
#4 0x4ce83e in run_builtin git.c:475:11
#5 0x4ccafe in handle_builtin git.c:729:3
#6 0x4cb01c in run_argv git.c:818:4
#7 0x4cb01c in cmd_main git.c:949:19
#8 0x6bd9ad in main common-main.c:52:11
#9 0x7fbfeffc4349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Direct leak of 16 byte(s) in 1 object(s) allocated from:
#0 0x49a82d in malloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0xa8bd09 in do_xmalloc wrapper.c:41:8
#2 0x5dbc34 in internal_prefix_pathspec builtin/mv.c:32:2
#3 0x5da4e4 in cmd_mv builtin/mv.c:148:11
#4 0x4ce83e in run_builtin git.c:475:11
#5 0x4ccafe in handle_builtin git.c:729:3
#6 0x4cb01c in run_argv git.c:818:4
#7 0x4cb01c in cmd_main git.c:949:19
#8 0x6bd9ad in main common-main.c:52:11
#9 0x7fbfeffc4349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Direct leak of 8 byte(s) in 1 object(s) allocated from:
#0 0x49a9a2 in calloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:154:3
#1 0xa8c119 in xcalloc wrapper.c:140:8
#2 0x5da585 in cmd_mv builtin/mv.c:159:22
#3 0x4ce83e in run_builtin git.c:475:11
#4 0x4ccafe in handle_builtin git.c:729:3
#5 0x4cb01c in run_argv git.c:818:4
#6 0x4cb01c in cmd_main git.c:949:19
#7 0x6bd9ad in main common-main.c:52:11
#8 0x7fbfeffc4349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Direct leak of 4 byte(s) in 1 object(s) allocated from:
#0 0x49a9a2 in calloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:154:3
#1 0xa8c119 in xcalloc wrapper.c:140:8
#2 0x5da4f8 in cmd_mv builtin/mv.c:149:10
#3 0x4ce83e in run_builtin git.c:475:11
#4 0x4ccafe in handle_builtin git.c:729:3
#5 0x4cb01c in run_argv git.c:818:4
#6 0x4cb01c in cmd_main git.c:949:19
#7 0x6bd9ad in main common-main.c:52:11
#8 0x7fbfeffc4349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 65 byte(s) in 1 object(s) allocated from:
#0 0x49ab49 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0xa8c015 in xrealloc wrapper.c:126:8
#2 0xa00226 in strbuf_grow strbuf.c:98:2
#3 0xa00226 in strbuf_vaddf strbuf.c:394:3
#4 0xa065c7 in xstrvfmt strbuf.c:981:2
#5 0xa065c7 in xstrfmt strbuf.c:991:8
#6 0x9e7ce7 in prefix_path_gently setup.c:115:15
#7 0x9e7fa6 in prefix_path setup.c:128:12
#8 0x5dbdbf in internal_prefix_pathspec builtin/mv.c:55:23
#9 0x5da575 in cmd_mv builtin/mv.c:158:14
#10 0x4ce83e in run_builtin git.c:475:11
#11 0x4ccafe in handle_builtin git.c:729:3
#12 0x4cb01c in run_argv git.c:818:4
#13 0x4cb01c in cmd_main git.c:949:19
git-for-windows#14 0x6bd9ad in main common-main.c:52:11
git-for-windows#15 0x7fbfeffc4349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 65 byte(s) in 1 object(s) allocated from:
#0 0x49ab49 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0xa8c015 in xrealloc wrapper.c:126:8
#2 0xa00226 in strbuf_grow strbuf.c:98:2
#3 0xa00226 in strbuf_vaddf strbuf.c:394:3
#4 0xa065c7 in xstrvfmt strbuf.c:981:2
#5 0xa065c7 in xstrfmt strbuf.c:991:8
#6 0x9e7ce7 in prefix_path_gently setup.c:115:15
#7 0x9e7fa6 in prefix_path setup.c:128:12
#8 0x5dbdbf in internal_prefix_pathspec builtin/mv.c:55:23
#9 0x5da4e4 in cmd_mv builtin/mv.c:148:11
#10 0x4ce83e in run_builtin git.c:475:11
#11 0x4ccafe in handle_builtin git.c:729:3
#12 0x4cb01c in run_argv git.c:818:4
#13 0x4cb01c in cmd_main git.c:949:19
git-for-windows#14 0x6bd9ad in main common-main.c:52:11
git-for-windows#15 0x7fbfeffc4349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 558 byte(s) leaked in 7 allocation(s).
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
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that referenced
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Aug 17, 2021
merge_name() calls dwim_ref(), which allocates a new string into
found_ref. Therefore add a free() to avoid leaking found_ref.
LSAN output from t0021:
Direct leak of 16 byte(s) in 1 object(s) allocated from:
#0 0x486804 in strdup ../projects/compiler-rt/lib/asan/asan_interceptors.cpp:452:3
#1 0xa8beb8 in xstrdup wrapper.c:29:14
#2 0x954054 in expand_ref refs.c:671:12
#3 0x953cb6 in repo_dwim_ref refs.c:644:22
#4 0x5d3759 in dwim_ref refs.h:162:9
#5 0x5d3759 in merge_name builtin/merge.c:517:6
#6 0x5d3759 in collect_parents builtin/merge.c:1214:5
#7 0x5cf60d in cmd_merge builtin/merge.c:1458:16
#8 0x4ce83e in run_builtin git.c:475:11
#9 0x4ccafe in handle_builtin git.c:729:3
#10 0x4cb01c in run_argv git.c:818:4
#11 0x4cb01c in cmd_main git.c:949:19
#12 0x6bdbfd in main common-main.c:52:11
#13 0x7f0430502349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 16 byte(s) leaked in 1 allocation(s).
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
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Aug 17, 2021
setup_unpack_trees_porcelain() populates various fields on
unpack_tree_opts, we need to call clear_unpack_trees_porcelain() to
avoid leaking them. Specifically, we used to leak
unpack_tree_opts.msgs_to_free.
We have to do this in leave_reset_head because there are multiple
scenarios where unpack_tree_opts has already been configured, followed
by a 'goto leave_reset_head'. But we can also 'goto leave_reset_head'
prior to having initialised unpack_tree_opts via memset(..., 0, ...).
Therefore we also move unpack_tree_opts initialisation to the start of
reset_head(), and convert it to use brace initialisation - which
guarantees that we can never clear an uninitialised unpack_tree_opts.
clear_unpack_tree_opts() is always safe to call as long as
unpack_tree_opts is at least zero-initialised, i.e. it does not depend
on a previous call to setup_unpack_trees_porcelain().
LSAN output from t0021:
Direct leak of 192 byte(s) in 1 object(s) allocated from:
#0 0x49ab49 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0xa721e5 in xrealloc wrapper.c:126:8
#2 0x9f7861 in strvec_push_nodup strvec.c:19:2
#3 0x9f7861 in strvec_pushf strvec.c:39:2
#4 0xa43e14 in setup_unpack_trees_porcelain unpack-trees.c:129:3
#5 0x97e011 in reset_head reset.c:53:2
#6 0x61dfa5 in cmd_rebase builtin/rebase.c:1991:9
#7 0x4ce83e in run_builtin git.c:475:11
#8 0x4ccafe in handle_builtin git.c:729:3
#9 0x4cb01c in run_argv git.c:818:4
#10 0x4cb01c in cmd_main git.c:949:19
#11 0x6b3f3d in main common-main.c:52:11
#12 0x7fa8addf3349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 147 byte(s) in 1 object(s) allocated from:
#0 0x49ab49 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0xa721e5 in xrealloc wrapper.c:126:8
#2 0x9e8d54 in strbuf_grow strbuf.c:98:2
#3 0x9e8d54 in strbuf_vaddf strbuf.c:401:3
#4 0x9f7774 in strvec_pushf strvec.c:36:2
#5 0xa43e14 in setup_unpack_trees_porcelain unpack-trees.c:129:3
#6 0x97e011 in reset_head reset.c:53:2
#7 0x61dfa5 in cmd_rebase builtin/rebase.c:1991:9
#8 0x4ce83e in run_builtin git.c:475:11
#9 0x4ccafe in handle_builtin git.c:729:3
#10 0x4cb01c in run_argv git.c:818:4
#11 0x4cb01c in cmd_main git.c:949:19
#12 0x6b3f3d in main common-main.c:52:11
#13 0x7fa8addf3349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 134 byte(s) in 1 object(s) allocated from:
#0 0x49ab49 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0xa721e5 in xrealloc wrapper.c:126:8
#2 0x9e8d54 in strbuf_grow strbuf.c:98:2
#3 0x9e8d54 in strbuf_vaddf strbuf.c:401:3
#4 0x9f7774 in strvec_pushf strvec.c:36:2
#5 0xa43fe4 in setup_unpack_trees_porcelain unpack-trees.c:168:3
#6 0x97e011 in reset_head reset.c:53:2
#7 0x61dfa5 in cmd_rebase builtin/rebase.c:1991:9
#8 0x4ce83e in run_builtin git.c:475:11
#9 0x4ccafe in handle_builtin git.c:729:3
#10 0x4cb01c in run_argv git.c:818:4
#11 0x4cb01c in cmd_main git.c:949:19
#12 0x6b3f3d in main common-main.c:52:11
#13 0x7fa8addf3349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 130 byte(s) in 1 object(s) allocated from:
#0 0x49ab49 in realloc ../projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0xa721e5 in xrealloc wrapper.c:126:8
#2 0x9e8d54 in strbuf_grow strbuf.c:98:2
#3 0x9e8d54 in strbuf_vaddf strbuf.c:401:3
#4 0x9f7774 in strvec_pushf strvec.c:36:2
#5 0xa43f20 in setup_unpack_trees_porcelain unpack-trees.c:150:3
#6 0x97e011 in reset_head reset.c:53:2
#7 0x61dfa5 in cmd_rebase builtin/rebase.c:1991:9
#8 0x4ce83e in run_builtin git.c:475:11
#9 0x4ccafe in handle_builtin git.c:729:3
#10 0x4cb01c in run_argv git.c:818:4
#11 0x4cb01c in cmd_main git.c:949:19
#12 0x6b3f3d in main common-main.c:52:11
#13 0x7fa8addf3349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 603 byte(s) leaked in 4 allocation(s).
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Oct 13, 2021
In a sparse index it is possible for the tree that is being verified
to be freed while it is being verified. This happens when the index is
sparse but the cache tree is not and index_name_pos() looks up a path
from the cache tree that is a descendant of a sparse index entry. That
triggers a call to ensure_full_index() which frees the cache tree that
is being verified. Carrying on trying to verify the tree after this
results in a use-after-free bug. Instead restart the verification if a
sparse index is converted to a full index. This bug is triggered by a
call to reset_head() in "git rebase --apply". Thanks to René Scharfe
and Derrick Stolee for their help analyzing the problem.
==74345==ERROR: AddressSanitizer: heap-use-after-free on address 0x606000001b20 at pc 0x557cbe82d3a2 bp 0x7ffdfee08090 sp 0x7ffdfee08080
READ of size 4 at 0x606000001b20 thread T0
#0 0x557cbe82d3a1 in verify_one /home/phil/src/git/cache-tree.c:863
#1 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#2 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#3 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#4 0x557cbe830a2b in cache_tree_verify /home/phil/src/git/cache-tree.c:910
#5 0x557cbea53741 in write_locked_index /home/phil/src/git/read-cache.c:3250
#6 0x557cbeab7fdd in reset_head /home/phil/src/git/reset.c:87
#7 0x557cbe72147f in cmd_rebase builtin/rebase.c:2074
#8 0x557cbe5bd151 in run_builtin /home/phil/src/git/git.c:461
#9 0x557cbe5bd151 in handle_builtin /home/phil/src/git/git.c:714
#10 0x557cbe5c0503 in run_argv /home/phil/src/git/git.c:781
#11 0x557cbe5c0503 in cmd_main /home/phil/src/git/git.c:912
#12 0x557cbe5bad28 in main /home/phil/src/git/common-main.c:52
#13 0x7fdd4b82eb24 in __libc_start_main (/usr/lib/libc.so.6+0x27b24)
git-for-windows#14 0x557cbe5bcb8d in _start (/home/phil/src/git/git+0x1b9b8d)
0x606000001b20 is located 0 bytes inside of 56-byte region [0x606000001b20,0x606000001b58)
freed by thread T0 here:
#0 0x7fdd4bacff19 in __interceptor_free /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cpp:127
#1 0x557cbe82af60 in cache_tree_free /home/phil/src/git/cache-tree.c:35
#2 0x557cbe82aee5 in cache_tree_free /home/phil/src/git/cache-tree.c:31
#3 0x557cbe82aee5 in cache_tree_free /home/phil/src/git/cache-tree.c:31
#4 0x557cbe82aee5 in cache_tree_free /home/phil/src/git/cache-tree.c:31
#5 0x557cbeb2557a in ensure_full_index /home/phil/src/git/sparse-index.c:310
#6 0x557cbea45c4a in index_name_stage_pos /home/phil/src/git/read-cache.c:588
#7 0x557cbe82ce37 in verify_one /home/phil/src/git/cache-tree.c:850
#8 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#9 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#10 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#11 0x557cbe830a2b in cache_tree_verify /home/phil/src/git/cache-tree.c:910
#12 0x557cbea53741 in write_locked_index /home/phil/src/git/read-cache.c:3250
#13 0x557cbeab7fdd in reset_head /home/phil/src/git/reset.c:87
git-for-windows#14 0x557cbe72147f in cmd_rebase builtin/rebase.c:2074
git-for-windows#15 0x557cbe5bd151 in run_builtin /home/phil/src/git/git.c:461
git-for-windows#16 0x557cbe5bd151 in handle_builtin /home/phil/src/git/git.c:714
git-for-windows#17 0x557cbe5c0503 in run_argv /home/phil/src/git/git.c:781
git-for-windows#18 0x557cbe5c0503 in cmd_main /home/phil/src/git/git.c:912
git-for-windows#19 0x557cbe5bad28 in main /home/phil/src/git/common-main.c:52
git-for-windows#20 0x7fdd4b82eb24 in __libc_start_main (/usr/lib/libc.so.6+0x27b24)
previously allocated by thread T0 here:
#0 0x7fdd4bad0459 in __interceptor_calloc /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cpp:154
#1 0x557cbebc1807 in xcalloc /home/phil/src/git/wrapper.c:140
#2 0x557cbe82b7d8 in cache_tree /home/phil/src/git/cache-tree.c:17
#3 0x557cbe82b7d8 in prime_cache_tree_rec /home/phil/src/git/cache-tree.c:763
#4 0x557cbe82b837 in prime_cache_tree_rec /home/phil/src/git/cache-tree.c:764
#5 0x557cbe82b837 in prime_cache_tree_rec /home/phil/src/git/cache-tree.c:764
#6 0x557cbe8304e1 in prime_cache_tree /home/phil/src/git/cache-tree.c:779
#7 0x557cbeab7fa7 in reset_head /home/phil/src/git/reset.c:85
#8 0x557cbe72147f in cmd_rebase builtin/rebase.c:2074
#9 0x557cbe5bd151 in run_builtin /home/phil/src/git/git.c:461
#10 0x557cbe5bd151 in handle_builtin /home/phil/src/git/git.c:714
#11 0x557cbe5c0503 in run_argv /home/phil/src/git/git.c:781
#12 0x557cbe5c0503 in cmd_main /home/phil/src/git/git.c:912
#13 0x557cbe5bad28 in main /home/phil/src/git/common-main.c:52
git-for-windows#14 0x7fdd4b82eb24 in __libc_start_main (/usr/lib/libc.so.6+0x27b24)
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Nov 8, 2021
In a sparse index it is possible for the tree that is being verified
to be freed while it is being verified. This happens when the index is
sparse but the cache tree is not and index_name_pos() looks up a path
from the cache tree that is a descendant of a sparse index entry. That
triggers a call to ensure_full_index() which frees the cache tree that
is being verified. Carrying on trying to verify the tree after this
results in a use-after-free bug. Instead restart the verification if a
sparse index is converted to a full index. This bug is triggered by a
call to reset_head() in "git rebase --apply". Thanks to René Scharfe
and Derrick Stolee for their help analyzing the problem.
==74345==ERROR: AddressSanitizer: heap-use-after-free on address 0x606000001b20 at pc 0x557cbe82d3a2 bp 0x7ffdfee08090 sp 0x7ffdfee08080
READ of size 4 at 0x606000001b20 thread T0
#0 0x557cbe82d3a1 in verify_one /home/phil/src/git/cache-tree.c:863
#1 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#2 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#3 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#4 0x557cbe830a2b in cache_tree_verify /home/phil/src/git/cache-tree.c:910
#5 0x557cbea53741 in write_locked_index /home/phil/src/git/read-cache.c:3250
#6 0x557cbeab7fdd in reset_head /home/phil/src/git/reset.c:87
#7 0x557cbe72147f in cmd_rebase builtin/rebase.c:2074
#8 0x557cbe5bd151 in run_builtin /home/phil/src/git/git.c:461
#9 0x557cbe5bd151 in handle_builtin /home/phil/src/git/git.c:714
#10 0x557cbe5c0503 in run_argv /home/phil/src/git/git.c:781
#11 0x557cbe5c0503 in cmd_main /home/phil/src/git/git.c:912
#12 0x557cbe5bad28 in main /home/phil/src/git/common-main.c:52
#13 0x7fdd4b82eb24 in __libc_start_main (/usr/lib/libc.so.6+0x27b24)
git-for-windows#14 0x557cbe5bcb8d in _start (/home/phil/src/git/git+0x1b9b8d)
0x606000001b20 is located 0 bytes inside of 56-byte region [0x606000001b20,0x606000001b58)
freed by thread T0 here:
#0 0x7fdd4bacff19 in __interceptor_free /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cpp:127
#1 0x557cbe82af60 in cache_tree_free /home/phil/src/git/cache-tree.c:35
#2 0x557cbe82aee5 in cache_tree_free /home/phil/src/git/cache-tree.c:31
#3 0x557cbe82aee5 in cache_tree_free /home/phil/src/git/cache-tree.c:31
#4 0x557cbe82aee5 in cache_tree_free /home/phil/src/git/cache-tree.c:31
#5 0x557cbeb2557a in ensure_full_index /home/phil/src/git/sparse-index.c:310
#6 0x557cbea45c4a in index_name_stage_pos /home/phil/src/git/read-cache.c:588
#7 0x557cbe82ce37 in verify_one /home/phil/src/git/cache-tree.c:850
#8 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#9 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#10 0x557cbe82ca9d in verify_one /home/phil/src/git/cache-tree.c:840
#11 0x557cbe830a2b in cache_tree_verify /home/phil/src/git/cache-tree.c:910
#12 0x557cbea53741 in write_locked_index /home/phil/src/git/read-cache.c:3250
#13 0x557cbeab7fdd in reset_head /home/phil/src/git/reset.c:87
git-for-windows#14 0x557cbe72147f in cmd_rebase builtin/rebase.c:2074
git-for-windows#15 0x557cbe5bd151 in run_builtin /home/phil/src/git/git.c:461
git-for-windows#16 0x557cbe5bd151 in handle_builtin /home/phil/src/git/git.c:714
git-for-windows#17 0x557cbe5c0503 in run_argv /home/phil/src/git/git.c:781
git-for-windows#18 0x557cbe5c0503 in cmd_main /home/phil/src/git/git.c:912
git-for-windows#19 0x557cbe5bad28 in main /home/phil/src/git/common-main.c:52
git-for-windows#20 0x7fdd4b82eb24 in __libc_start_main (/usr/lib/libc.so.6+0x27b24)
previously allocated by thread T0 here:
#0 0x7fdd4bad0459 in __interceptor_calloc /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cpp:154
#1 0x557cbebc1807 in xcalloc /home/phil/src/git/wrapper.c:140
#2 0x557cbe82b7d8 in cache_tree /home/phil/src/git/cache-tree.c:17
#3 0x557cbe82b7d8 in prime_cache_tree_rec /home/phil/src/git/cache-tree.c:763
#4 0x557cbe82b837 in prime_cache_tree_rec /home/phil/src/git/cache-tree.c:764
#5 0x557cbe82b837 in prime_cache_tree_rec /home/phil/src/git/cache-tree.c:764
#6 0x557cbe8304e1 in prime_cache_tree /home/phil/src/git/cache-tree.c:779
#7 0x557cbeab7fa7 in reset_head /home/phil/src/git/reset.c:85
#8 0x557cbe72147f in cmd_rebase builtin/rebase.c:2074
#9 0x557cbe5bd151 in run_builtin /home/phil/src/git/git.c:461
#10 0x557cbe5bd151 in handle_builtin /home/phil/src/git/git.c:714
#11 0x557cbe5c0503 in run_argv /home/phil/src/git/git.c:781
#12 0x557cbe5c0503 in cmd_main /home/phil/src/git/git.c:912
#13 0x557cbe5bad28 in main /home/phil/src/git/common-main.c:52
git-for-windows#14 0x7fdd4b82eb24 in __libc_start_main (/usr/lib/libc.so.6+0x27b24)
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Feb 11, 2022
When fetching packfiles, we write a bunch of lockfiles for the packfiles
we're writing into the repository. In order to not leave behind any
cruft in case we exit or receive a signal, we register both an exit
handler as well as signal handlers for common signals like SIGINT. These
handlers will then unlink the locks and free the data structure tracking
them. We have observed a deadlock in this logic though:
(gdb) bt
#0 __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1 0x00007f4932bea2cd in _int_free (av=0x7f4932f2eb20 <main_arena>, p=0x3e3e4200, have_lock=0) at malloc.c:3969
#2 0x00007f4932bee58c in __GI___libc_free (mem=<optimized out>) at malloc.c:2975
#3 0x0000000000662ab1 in string_list_clear ()
#4 0x000000000044f5bc in unlock_pack_on_signal ()
#5 <signal handler called>
#6 _int_free (av=0x7f4932f2eb20 <main_arena>, p=<optimized out>, have_lock=0) at malloc.c:4024
#7 0x00007f4932bee58c in __GI___libc_free (mem=<optimized out>) at malloc.c:2975
#8 0x000000000065afd5 in strbuf_release ()
#9 0x000000000066ddb9 in delete_tempfile ()
#10 0x0000000000610d0b in files_transaction_cleanup.isra ()
#11 0x0000000000611718 in files_transaction_abort ()
#12 0x000000000060d2ef in ref_transaction_abort ()
#13 0x000000000060d441 in ref_transaction_prepare ()
git-for-windows#14 0x000000000060e0b5 in ref_transaction_commit ()
git-for-windows#15 0x00000000004511c2 in fetch_and_consume_refs ()
git-for-windows#16 0x000000000045279a in cmd_fetch ()
git-for-windows#17 0x0000000000407c48 in handle_builtin ()
git-for-windows#18 0x0000000000408df2 in cmd_main ()
git-for-windows#19 0x00000000004078b5 in main ()
The process was killed with a signal, which caused the signal handler to
kick in and try free the data structures after we have unlinked the
locks. It then deadlocks while calling free(3P).
The root cause of this is that it is not allowed to call certain
functions in async-signal handlers, as specified by signal-safety(7).
Next to most I/O functions, this list of disallowed functions also
includes memory-handling functions like malloc(3P) and free(3P) because
they may not be reentrant. As a result, if we execute such functions in
the signal handler, then they may operate on inconistent state and fail
in unexpected ways.
Fix this bug by not calling non-async-signal-safe functions when running
in the signal handler. We're about to re-raise the signal anyway and
will thus exit, so it's not much of a problem to keep the string list of
lockfiles untouched. Note that it's fine though to call unlink(2), so
we'll still clean up the lockfiles correctly.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Reviewed-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Dec 21, 2022
When "read_strategy_opts()" is called we may have populated the
"opts->strategy" before, so we'll need to free() it to avoid leaking
memory.
We populate it before because we cal get_replay_opts() from within
"rebase.c" with an already populated "opts", which we then copy. Then
if we're doing a "rebase -i" the sequencer API itself will promptly
clobber our alloc'd version of it with its own.
If this code is changed to do, instead of the added free() here a:
if (opts->strategy)
opts->strategy = xstrdup("another leak");
We get a couple of stacktraces from -fsanitize=leak showing how we
ended up clobbering the already allocated value, i.e.:
Direct leak of 6 byte(s) in 1 object(s) allocated from:
#0 0x7f2e8cd45545 in __interceptor_malloc ../../../../src/libsanitizer/lsan/lsan_interceptors.cpp:75
#1 0x7f2e8cb0fcaa in __GI___strdup string/strdup.c:42
#2 0x6c4778 in xstrdup wrapper.c:39
#3 0x66bcb8 in read_strategy_opts sequencer.c:2902
#4 0x66bf7b in read_populate_opts sequencer.c:2969
#5 0x6723f9 in sequencer_continue sequencer.c:5063
#6 0x4a4f74 in run_sequencer_rebase builtin/rebase.c:348
#7 0x4a64c8 in run_specific_rebase builtin/rebase.c:753
#8 0x4a9b8b in cmd_rebase builtin/rebase.c:1824
#9 0x407a32 in run_builtin git.c:466
#10 0x407e0a in handle_builtin git.c:721
#11 0x40803d in run_argv git.c:788
#12 0x40850f in cmd_main git.c:923
#13 0x4eee79 in main common-main.c:57
git-for-windows#14 0x7f2e8ca9f209 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
git-for-windows#15 0x7f2e8ca9f2bb in __libc_start_main_impl ../csu/libc-start.c:389
git-for-windows#16 0x405fd0 in _start (git+0x405fd0)
Direct leak of 4 byte(s) in 1 object(s) allocated from:
#0 0x7f2e8cd45545 in __interceptor_malloc ../../../../src/libsanitizer/lsan/lsan_interceptors.cpp:75
#1 0x7f2e8cb0fcaa in __GI___strdup string/strdup.c:42
#2 0x6c4778 in xstrdup wrapper.c:39
#3 0x4a3c31 in xstrdup_or_null git-compat-util.h:1169
#4 0x4a447a in get_replay_opts builtin/rebase.c:163
#5 0x4a4f5b in run_sequencer_rebase builtin/rebase.c:346
#6 0x4a64c8 in run_specific_rebase builtin/rebase.c:753
#7 0x4a9b8b in cmd_rebase builtin/rebase.c:1824
#8 0x407a32 in run_builtin git.c:466
#9 0x407e0a in handle_builtin git.c:721
#10 0x40803d in run_argv git.c:788
#11 0x40850f in cmd_main git.c:923
#12 0x4eee79 in main common-main.c:57
#13 0x7f2e8ca9f209 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
git-for-windows#14 0x7f2e8ca9f2bb in __libc_start_main_impl ../csu/libc-start.c:389
git-for-windows#15 0x405fd0 in _start (git+0x405fd0)
This can be seen in e.g. the 4th test of
"t3404-rebase-interactive.sh".
In the larger picture the ownership of the "struct replay_opts" is
quite a mess, e.g. in this case rebase.c's static "get_replay_opts()"
function partially creates it, but nothing in rebase.c will free()
it. The structure is "mostly owned" by the sequencer API, but it also
expects to get these partially populated versions of it.
It would be better to have rebase keep track of what it allocated, and
free() that, and to pass that as a "const" to the sequencer API, which
would copy what it needs to its own version, and to free() that.
But doing so is a much larger change, and however messy the ownership
boundary is here is consistent with what we're doing already, so let's
just free() this to fix the leak.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Mar 16, 2023
There is an out-of-bounds read possible when parsing gitattributes that
have an attribute that is 2^31+1 bytes long. This is caused due to an
integer overflow when we assign the result of strlen(3P) to an `int`,
where we use the wrapped-around value in a subsequent call to
memcpy(3P). The following code reproduces the issue:
blob=$(perl -e 'print "a" x 2147483649 . " attr"' | git hash-object -w --stdin)
git update-index --add --cacheinfo 100644,$blob,.gitattributes
git check-attr --all file
AddressSanitizer:DEADLYSIGNAL
=================================================================
==8451==ERROR: AddressSanitizer: SEGV on unknown address 0x7f93efa00800 (pc 0x7f94f1f8f082 bp 0x7ffddb59b3a0 sp 0x7ffddb59ab28 T0)
==8451==The signal is caused by a READ memory access.
#0 0x7f94f1f8f082 (/usr/lib/libc.so.6+0x176082)
#1 0x7f94f2047d9c in __interceptor_strspn /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:752
#2 0x560e190f7f26 in parse_attr_line attr.c:375
#3 0x560e190f9663 in handle_attr_line attr.c:660
#4 0x560e190f9ddd in read_attr_from_index attr.c:769
#5 0x560e190f9f14 in read_attr attr.c:797
#6 0x560e190fa24e in bootstrap_attr_stack attr.c:867
#7 0x560e190fa4a5 in prepare_attr_stack attr.c:902
#8 0x560e190fb5dc in collect_some_attrs attr.c:1097
#9 0x560e190fb93f in git_all_attrs attr.c:1128
#10 0x560e18e6136e in check_attr builtin/check-attr.c:67
#11 0x560e18e61c12 in cmd_check_attr builtin/check-attr.c:183
#12 0x560e18e15993 in run_builtin git.c:466
#13 0x560e18e16397 in handle_builtin git.c:721
git-for-windows#14 0x560e18e16b2b in run_argv git.c:788
git-for-windows#15 0x560e18e17991 in cmd_main git.c:926
git-for-windows#16 0x560e190ae2bd in main common-main.c:57
git-for-windows#17 0x7f94f1e3c28f (/usr/lib/libc.so.6+0x2328f)
git-for-windows#18 0x7f94f1e3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
git-for-windows#19 0x560e18e110e4 in _start ../sysdeps/x86_64/start.S:115
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/usr/lib/libc.so.6+0x176082)
==8451==ABORTING
Fix this bug by converting the variable to a `size_t` instead.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Mar 16, 2023
It is possible to trigger an integer overflow when parsing attribute
names when there are more than 2^31 of them for a single pattern. This
can either lead to us dying due to trying to request too many bytes:
blob=$(perl -e 'print "f" . " a=" x 2147483649' | git hash-object -w --stdin)
git update-index --add --cacheinfo 100644,$blob,.gitattributes
git attr-check --all file
=================================================================
==1022==ERROR: AddressSanitizer: requested allocation size 0xfffffff800000032 (0xfffffff800001038 after adjustments for alignment, red zones etc.) exceeds maximum supported size of 0x10000000000 (thread T0)
#0 0x7fd3efabf411 in __interceptor_calloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:77
#1 0x5563a0a1e3d3 in xcalloc wrapper.c:150
#2 0x5563a058d005 in parse_attr_line attr.c:384
#3 0x5563a058e661 in handle_attr_line attr.c:660
#4 0x5563a058eddb in read_attr_from_index attr.c:769
#5 0x5563a058ef12 in read_attr attr.c:797
#6 0x5563a058f24c in bootstrap_attr_stack attr.c:867
#7 0x5563a058f4a3 in prepare_attr_stack attr.c:902
#8 0x5563a05905da in collect_some_attrs attr.c:1097
#9 0x5563a059093d in git_all_attrs attr.c:1128
#10 0x5563a02f636e in check_attr builtin/check-attr.c:67
#11 0x5563a02f6c12 in cmd_check_attr builtin/check-attr.c:183
#12 0x5563a02aa993 in run_builtin git.c:466
#13 0x5563a02ab397 in handle_builtin git.c:721
git-for-windows#14 0x5563a02abb2b in run_argv git.c:788
git-for-windows#15 0x5563a02ac991 in cmd_main git.c:926
git-for-windows#16 0x5563a05432bd in main common-main.c:57
git-for-windows#17 0x7fd3ef82228f (/usr/lib/libc.so.6+0x2328f)
==1022==HINT: if you don't care about these errors you may set allocator_may_return_null=1
SUMMARY: AddressSanitizer: allocation-size-too-big /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:77 in __interceptor_calloc
==1022==ABORTING
Or, much worse, it can lead to an out-of-bounds write because we
underallocate and then memcpy(3P) into an array:
perl -e '
print "A " . "\rh="x2000000000;
print "\rh="x2000000000;
print "\rh="x294967294 . "\n"
' >.gitattributes
git add .gitattributes
git commit -am "evil attributes"
$ git clone --quiet /path/to/repo
=================================================================
==15062==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000002550 at pc 0x5555559884d5 bp 0x7fffffffbc60 sp 0x7fffffffbc58
WRITE of size 8 at 0x602000002550 thread T0
#0 0x5555559884d4 in parse_attr_line attr.c:393
#1 0x5555559884d4 in handle_attr_line attr.c:660
#2 0x555555988902 in read_attr_from_index attr.c:784
#3 0x555555988902 in read_attr_from_index attr.c:747
#4 0x555555988a1d in read_attr attr.c:800
#5 0x555555989b0c in bootstrap_attr_stack attr.c:882
#6 0x555555989b0c in prepare_attr_stack attr.c:917
#7 0x555555989b0c in collect_some_attrs attr.c:1112
#8 0x55555598b141 in git_check_attr attr.c:1126
#9 0x555555a13004 in convert_attrs convert.c:1311
#10 0x555555a95e04 in checkout_entry_ca entry.c:553
#11 0x555555d58bf6 in checkout_entry entry.h:42
#12 0x555555d58bf6 in check_updates unpack-trees.c:480
#13 0x555555d5eb55 in unpack_trees unpack-trees.c:2040
git-for-windows#14 0x555555785ab7 in checkout builtin/clone.c:724
git-for-windows#15 0x555555785ab7 in cmd_clone builtin/clone.c:1384
git-for-windows#16 0x55555572443c in run_builtin git.c:466
git-for-windows#17 0x55555572443c in handle_builtin git.c:721
git-for-windows#18 0x555555727872 in run_argv git.c:788
git-for-windows#19 0x555555727872 in cmd_main git.c:926
git-for-windows#20 0x555555721fa0 in main common-main.c:57
git-for-windows#21 0x7ffff73f1d09 in __libc_start_main ../csu/libc-start.c:308
git-for-windows#22 0x555555723f39 in _start (git+0x1cff39)
0x602000002552 is located 0 bytes to the right of 2-byte region [0x602000002550,0x602000002552) allocated by thread T0 here:
#0 0x7ffff768c037 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:154
#1 0x555555d7fff7 in xcalloc wrapper.c:150
#2 0x55555598815f in parse_attr_line attr.c:384
#3 0x55555598815f in handle_attr_line attr.c:660
#4 0x555555988902 in read_attr_from_index attr.c:784
#5 0x555555988902 in read_attr_from_index attr.c:747
#6 0x555555988a1d in read_attr attr.c:800
#7 0x555555989b0c in bootstrap_attr_stack attr.c:882
#8 0x555555989b0c in prepare_attr_stack attr.c:917
#9 0x555555989b0c in collect_some_attrs attr.c:1112
#10 0x55555598b141 in git_check_attr attr.c:1126
#11 0x555555a13004 in convert_attrs convert.c:1311
#12 0x555555a95e04 in checkout_entry_ca entry.c:553
#13 0x555555d58bf6 in checkout_entry entry.h:42
git-for-windows#14 0x555555d58bf6 in check_updates unpack-trees.c:480
git-for-windows#15 0x555555d5eb55 in unpack_trees unpack-trees.c:2040
git-for-windows#16 0x555555785ab7 in checkout builtin/clone.c:724
git-for-windows#17 0x555555785ab7 in cmd_clone builtin/clone.c:1384
git-for-windows#18 0x55555572443c in run_builtin git.c:466
git-for-windows#19 0x55555572443c in handle_builtin git.c:721
git-for-windows#20 0x555555727872 in run_argv git.c:788
git-for-windows#21 0x555555727872 in cmd_main git.c:926
git-for-windows#22 0x555555721fa0 in main common-main.c:57
git-for-windows#23 0x7ffff73f1d09 in __libc_start_main ../csu/libc-start.c:308
SUMMARY: AddressSanitizer: heap-buffer-overflow attr.c:393 in parse_attr_line
Shadow bytes around the buggy address:
0x0c047fff8450: fa fa 00 02 fa fa 00 07 fa fa fd fd fa fa 00 00
0x0c047fff8460: fa fa 02 fa fa fa fd fd fa fa 00 06 fa fa 05 fa
0x0c047fff8470: fa fa fd fd fa fa 00 02 fa fa 06 fa fa fa 05 fa
0x0c047fff8480: fa fa 07 fa fa fa fd fd fa fa 00 01 fa fa 00 02
0x0c047fff8490: fa fa 00 03 fa fa 00 fa fa fa 00 01 fa fa 00 03
=>0x0c047fff84a0: fa fa 00 01 fa fa 00 02 fa fa[02]fa fa fa fa fa
0x0c047fff84b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff84c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff84d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff84e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff84f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
==15062==ABORTING
Fix this bug by using `size_t` instead to count the number of attributes
so that this value cannot reasonably overflow without running out of
memory before already.
Reported-by: Markus Vervier <markus.vervier@x41-dsec.de>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Mar 16, 2023
When using a padding specifier in the pretty format passed to git-log(1)
we need to calculate the string length in several places. These string
lengths are stored in `int`s though, which means that these can easily
overflow when the input lengths exceeds 2GB. This can ultimately lead to
an out-of-bounds write when these are used in a call to memcpy(3P):
==8340==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7f1ec62f97fe at pc 0x7f2127e5f427 bp 0x7ffd3bd63de0 sp 0x7ffd3bd63588
WRITE of size 1 at 0x7f1ec62f97fe thread T0
#0 0x7f2127e5f426 in __interceptor_memcpy /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827
#1 0x5628e96aa605 in format_and_pad_commit pretty.c:1762
#2 0x5628e96aa7f4 in format_commit_item pretty.c:1801
#3 0x5628e97cdb24 in strbuf_expand strbuf.c:429
#4 0x5628e96ab060 in repo_format_commit_message pretty.c:1869
#5 0x5628e96acd0f in pretty_print_commit pretty.c:2161
#6 0x5628e95a44c8 in show_log log-tree.c:781
#7 0x5628e95a76ba in log_tree_commit log-tree.c:1117
#8 0x5628e922bed5 in cmd_log_walk_no_free builtin/log.c:508
#9 0x5628e922c35b in cmd_log_walk builtin/log.c:549
#10 0x5628e922f1a2 in cmd_log builtin/log.c:883
#11 0x5628e9106993 in run_builtin git.c:466
#12 0x5628e9107397 in handle_builtin git.c:721
#13 0x5628e9107b07 in run_argv git.c:788
git-for-windows#14 0x5628e91088a7 in cmd_main git.c:923
git-for-windows#15 0x5628e939d682 in main common-main.c:57
git-for-windows#16 0x7f2127c3c28f (/usr/lib/libc.so.6+0x2328f)
git-for-windows#17 0x7f2127c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
git-for-windows#18 0x5628e91020e4 in _start ../sysdeps/x86_64/start.S:115
0x7f1ec62f97fe is located 2 bytes to the left of 4831838265-byte region [0x7f1ec62f9800,0x7f1fe62f9839)
allocated by thread T0 here:
#0 0x7f2127ebe7ea in __interceptor_realloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:85
#1 0x5628e98774d4 in xrealloc wrapper.c:136
#2 0x5628e97cb01c in strbuf_grow strbuf.c:99
#3 0x5628e97ccd42 in strbuf_addchars strbuf.c:327
#4 0x5628e96aa55c in format_and_pad_commit pretty.c:1761
#5 0x5628e96aa7f4 in format_commit_item pretty.c:1801
#6 0x5628e97cdb24 in strbuf_expand strbuf.c:429
#7 0x5628e96ab060 in repo_format_commit_message pretty.c:1869
#8 0x5628e96acd0f in pretty_print_commit pretty.c:2161
#9 0x5628e95a44c8 in show_log log-tree.c:781
#10 0x5628e95a76ba in log_tree_commit log-tree.c:1117
#11 0x5628e922bed5 in cmd_log_walk_no_free builtin/log.c:508
#12 0x5628e922c35b in cmd_log_walk builtin/log.c:549
#13 0x5628e922f1a2 in cmd_log builtin/log.c:883
git-for-windows#14 0x5628e9106993 in run_builtin git.c:466
git-for-windows#15 0x5628e9107397 in handle_builtin git.c:721
git-for-windows#16 0x5628e9107b07 in run_argv git.c:788
git-for-windows#17 0x5628e91088a7 in cmd_main git.c:923
git-for-windows#18 0x5628e939d682 in main common-main.c:57
git-for-windows#19 0x7f2127c3c28f (/usr/lib/libc.so.6+0x2328f)
git-for-windows#20 0x7f2127c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
git-for-windows#21 0x5628e91020e4 in _start ../sysdeps/x86_64/start.S:115
SUMMARY: AddressSanitizer: heap-buffer-overflow /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827 in __interceptor_memcpy
Shadow bytes around the buggy address:
0x0fe458c572a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe458c572b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe458c572c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe458c572d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe458c572e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0fe458c572f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa[fa]
0x0fe458c57300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe458c57310: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe458c57320: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe458c57330: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe458c57340: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==8340==ABORTING
The pretty format can also be used in `git archive` operations via the
`export-subst` attribute. So this is what in our opinion makes this a
critical issue in the context of Git forges which allow to download an
archive of user supplied Git repositories.
Fix this vulnerability by using `size_t` instead of `int` to track the
string lengths. Add tests which detect this vulnerability when Git is
compiled with the address sanitizer.
Reported-by: Joern Schneeweisz <jschneeweisz@gitlab.com>
Original-patch-by: Joern Schneeweisz <jschneeweisz@gitlab.com>
Modified-by: Taylor Blau <me@ttalorr.com>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Mar 16, 2023
With the `%>>(<N>)` pretty formatter, you can ask git-log(1) et al to
steal spaces. To do so we need to look ahead of the next token to see
whether there are spaces there. This loop takes into account ANSI
sequences that end with an `m`, and if it finds any it will skip them
until it finds the first space. While doing so it does not take into
account the buffer's limits though and easily does an out-of-bounds
read.
Add a test that hits this behaviour. While we don't have an easy way to
verify this, the test causes the following failure when run with
`SANITIZE=address`:
==37941==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x603000000baf at pc 0x55ba6f88e0d0 bp 0x7ffc84c50d20 sp 0x7ffc84c50d10
READ of size 1 at 0x603000000baf thread T0
#0 0x55ba6f88e0cf in format_and_pad_commit pretty.c:1712
#1 0x55ba6f88e7b4 in format_commit_item pretty.c:1801
#2 0x55ba6f9b1ae4 in strbuf_expand strbuf.c:429
#3 0x55ba6f88f020 in repo_format_commit_message pretty.c:1869
#4 0x55ba6f890ccf in pretty_print_commit pretty.c:2161
#5 0x55ba6f7884c8 in show_log log-tree.c:781
#6 0x55ba6f78b6ba in log_tree_commit log-tree.c:1117
#7 0x55ba6f40fed5 in cmd_log_walk_no_free builtin/log.c:508
#8 0x55ba6f41035b in cmd_log_walk builtin/log.c:549
#9 0x55ba6f4131a2 in cmd_log builtin/log.c:883
#10 0x55ba6f2ea993 in run_builtin git.c:466
#11 0x55ba6f2eb397 in handle_builtin git.c:721
#12 0x55ba6f2ebb07 in run_argv git.c:788
#13 0x55ba6f2ec8a7 in cmd_main git.c:923
git-for-windows#14 0x55ba6f581682 in main common-main.c:57
git-for-windows#15 0x7f2d08c3c28f (/usr/lib/libc.so.6+0x2328f)
git-for-windows#16 0x7f2d08c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
git-for-windows#17 0x55ba6f2e60e4 in _start ../sysdeps/x86_64/start.S:115
0x603000000baf is located 1 bytes to the left of 24-byte region [0x603000000bb0,0x603000000bc8)
allocated by thread T0 here:
#0 0x7f2d08ebe7ea in __interceptor_realloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:85
#1 0x55ba6fa5b494 in xrealloc wrapper.c:136
#2 0x55ba6f9aefdc in strbuf_grow strbuf.c:99
#3 0x55ba6f9b0a06 in strbuf_add strbuf.c:298
#4 0x55ba6f9b1a25 in strbuf_expand strbuf.c:418
#5 0x55ba6f88f020 in repo_format_commit_message pretty.c:1869
#6 0x55ba6f890ccf in pretty_print_commit pretty.c:2161
#7 0x55ba6f7884c8 in show_log log-tree.c:781
#8 0x55ba6f78b6ba in log_tree_commit log-tree.c:1117
#9 0x55ba6f40fed5 in cmd_log_walk_no_free builtin/log.c:508
#10 0x55ba6f41035b in cmd_log_walk builtin/log.c:549
#11 0x55ba6f4131a2 in cmd_log builtin/log.c:883
#12 0x55ba6f2ea993 in run_builtin git.c:466
#13 0x55ba6f2eb397 in handle_builtin git.c:721
git-for-windows#14 0x55ba6f2ebb07 in run_argv git.c:788
git-for-windows#15 0x55ba6f2ec8a7 in cmd_main git.c:923
git-for-windows#16 0x55ba6f581682 in main common-main.c:57
git-for-windows#17 0x7f2d08c3c28f (/usr/lib/libc.so.6+0x2328f)
git-for-windows#18 0x7f2d08c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
git-for-windows#19 0x55ba6f2e60e4 in _start ../sysdeps/x86_64/start.S:115
SUMMARY: AddressSanitizer: heap-buffer-overflow pretty.c:1712 in format_and_pad_commit
Shadow bytes around the buggy address:
0x0c067fff8120: fa fa fd fd fd fa fa fa fd fd fd fa fa fa fd fd
0x0c067fff8130: fd fd fa fa fd fd fd fd fa fa fd fd fd fa fa fa
0x0c067fff8140: fd fd fd fa fa fa fd fd fd fa fa fa fd fd fd fa
0x0c067fff8150: fa fa fd fd fd fd fa fa 00 00 00 fa fa fa fd fd
0x0c067fff8160: fd fa fa fa fd fd fd fa fa fa fd fd fd fa fa fa
=>0x0c067fff8170: fd fd fd fa fa[fa]00 00 00 fa fa fa 00 00 00 fa
0x0c067fff8180: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8190: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff81a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff81b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff81c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Luckily enough, this would only cause us to copy the out-of-bounds data
into the formatted commit in case we really had an ANSI sequence
preceding our buffer. So this bug likely has no security consequences.
Fix it regardless by not traversing past the buffer's start.
Reported-by: Patrick Steinhardt <ps@pks.im>
Reported-by: Eric Sesterhenn <eric.sesterhenn@x41-dsec.de>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
pushed a commit
that referenced
this pull request
Mar 16, 2023
An out-of-bounds read can be triggered when parsing an incomplete padding format string passed via `--pretty=format` or in Git archives when files are marked with the `export-subst` gitattribute. This bug exists since we have introduced support for truncating output via the `trunc` keyword a7f01c6 (pretty: support truncating in %>, %< and %><, 2013-04-19). Before this commit, we used to find the end of the formatting string by using strchr(3P). This function returns a `NULL` pointer in case the character in question wasn't found. The subsequent check whether any character was found thus simply checked the returned pointer. After the commit we switched to strcspn(3P) though, which only returns the offset to the first found character or to the trailing NUL byte. As the end pointer is now computed by adding the offset to the start pointer it won't be `NULL` anymore, and as a consequence the check doesn't do anything anymore. The out-of-bounds data that is being read can in fact end up in the formatted string. As a consequence, it is possible to leak memory contents either by calling git-log(1) or via git-archive(1) when any of the archived files is marked with the `export-subst` gitattribute. ==10888==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000000398 at pc 0x7f0356047cb2 bp 0x7fff3ffb95d0 sp 0x7fff3ffb8d78 READ of size 1 at 0x602000000398 thread T0 #0 0x7f0356047cb1 in __interceptor_strchrnul /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:725 #1 0x563b7cec9a43 in strbuf_expand strbuf.c:417 #2 0x563b7cda7060 in repo_format_commit_message pretty.c:1869 #3 0x563b7cda8d0f in pretty_print_commit pretty.c:2161 #4 0x563b7cca04c8 in show_log log-tree.c:781 #5 0x563b7cca36ba in log_tree_commit log-tree.c:1117 #6 0x563b7c927ed5 in cmd_log_walk_no_free builtin/log.c:508 #7 0x563b7c92835b in cmd_log_walk builtin/log.c:549 #8 0x563b7c92b1a2 in cmd_log builtin/log.c:883 #9 0x563b7c802993 in run_builtin git.c:466 #10 0x563b7c803397 in handle_builtin git.c:721 #11 0x563b7c803b07 in run_argv git.c:788 #12 0x563b7c8048a7 in cmd_main git.c:923 #13 0x563b7ca99682 in main common-main.c:57 git-for-windows#14 0x7f0355e3c28f (/usr/lib/libc.so.6+0x2328f) git-for-windows#15 0x7f0355e3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349) git-for-windows#16 0x563b7c7fe0e4 in _start ../sysdeps/x86_64/start.S:115 0x602000000398 is located 0 bytes to the right of 8-byte region [0x602000000390,0x602000000398) allocated by thread T0 here: #0 0x7f0356072faa in __interceptor_strdup /usr/src/debug/gcc/libsanitizer/asan/asan_interceptors.cpp:439 #1 0x563b7cf7317c in xstrdup wrapper.c:39 #2 0x563b7cd9a06a in save_user_format pretty.c:40 #3 0x563b7cd9b3e5 in get_commit_format pretty.c:173 #4 0x563b7ce54ea0 in handle_revision_opt revision.c:2456 #5 0x563b7ce597c9 in setup_revisions revision.c:2850 #6 0x563b7c9269e0 in cmd_log_init_finish builtin/log.c:269 #7 0x563b7c927362 in cmd_log_init builtin/log.c:348 #8 0x563b7c92b193 in cmd_log builtin/log.c:882 #9 0x563b7c802993 in run_builtin git.c:466 #10 0x563b7c803397 in handle_builtin git.c:721 #11 0x563b7c803b07 in run_argv git.c:788 #12 0x563b7c8048a7 in cmd_main git.c:923 #13 0x563b7ca99682 in main common-main.c:57 git-for-windows#14 0x7f0355e3c28f (/usr/lib/libc.so.6+0x2328f) git-for-windows#15 0x7f0355e3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349) git-for-windows#16 0x563b7c7fe0e4 in _start ../sysdeps/x86_64/start.S:115 SUMMARY: AddressSanitizer: heap-buffer-overflow /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:725 in __interceptor_strchrnul Shadow bytes around the buggy address: 0x0c047fff8020: fa fa fd fd fa fa 00 06 fa fa 05 fa fa fa fd fd 0x0c047fff8030: fa fa 00 02 fa fa 06 fa fa fa 05 fa fa fa fd fd 0x0c047fff8040: fa fa 00 07 fa fa 03 fa fa fa fd fd fa fa 00 00 0x0c047fff8050: fa fa 00 01 fa fa fd fd fa fa 00 00 fa fa 00 01 0x0c047fff8060: fa fa 00 06 fa fa 00 06 fa fa 05 fa fa fa 05 fa =>0x0c047fff8070: fa fa 00[fa]fa fa fd fa fa fa fd fd fa fa fd fd 0x0c047fff8080: fa fa fd fd fa fa 00 00 fa fa 00 fa fa fa fd fa 0x0c047fff8090: fa fa fd fd fa fa 00 00 fa fa fa fa fa fa fa fa 0x0c047fff80a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c047fff80b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c047fff80c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==10888==ABORTING Fix this bug by checking whether `end` points at the trailing NUL byte. Add a test which catches this out-of-bounds read and which demonstrates that we used to write out-of-bounds data into the formatted message. Reported-by: Markus Vervier <markus.vervier@x41-dsec.de> Original-patch-by: Markus Vervier <markus.vervier@x41-dsec.de> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
jeffhostetler
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Mar 16, 2023
The return type of both `utf8_strwidth()` and `utf8_strnwidth()` is
`int`, but we operate on string lengths which are typically of type
`size_t`. This means that when the string is longer than `INT_MAX`, we
will overflow and thus return a negative result.
This can lead to an out-of-bounds write with `--pretty=format:%<1)%B`
and a commit message that is 2^31+1 bytes long:
=================================================================
==26009==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x603000001168 at pc 0x7f95c4e5f427 bp 0x7ffd8541c900 sp 0x7ffd8541c0a8
WRITE of size 2147483649 at 0x603000001168 thread T0
#0 0x7f95c4e5f426 in __interceptor_memcpy /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827
#1 0x5612bbb1068c in format_and_pad_commit pretty.c:1763
#2 0x5612bbb1087a in format_commit_item pretty.c:1801
#3 0x5612bbc33bab in strbuf_expand strbuf.c:429
#4 0x5612bbb110e7 in repo_format_commit_message pretty.c:1869
#5 0x5612bbb12d96 in pretty_print_commit pretty.c:2161
#6 0x5612bba0a4d5 in show_log log-tree.c:781
#7 0x5612bba0d6c7 in log_tree_commit log-tree.c:1117
#8 0x5612bb691ed5 in cmd_log_walk_no_free builtin/log.c:508
#9 0x5612bb69235b in cmd_log_walk builtin/log.c:549
#10 0x5612bb6951a2 in cmd_log builtin/log.c:883
#11 0x5612bb56c993 in run_builtin git.c:466
#12 0x5612bb56d397 in handle_builtin git.c:721
#13 0x5612bb56db07 in run_argv git.c:788
git-for-windows#14 0x5612bb56e8a7 in cmd_main git.c:923
git-for-windows#15 0x5612bb803682 in main common-main.c:57
git-for-windows#16 0x7f95c4c3c28f (/usr/lib/libc.so.6+0x2328f)
git-for-windows#17 0x7f95c4c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
git-for-windows#18 0x5612bb5680e4 in _start ../sysdeps/x86_64/start.S:115
0x603000001168 is located 0 bytes to the right of 24-byte region [0x603000001150,0x603000001168)
allocated by thread T0 here:
#0 0x7f95c4ebe7ea in __interceptor_realloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:85
#1 0x5612bbcdd556 in xrealloc wrapper.c:136
#2 0x5612bbc310a3 in strbuf_grow strbuf.c:99
#3 0x5612bbc32acd in strbuf_add strbuf.c:298
#4 0x5612bbc33aec in strbuf_expand strbuf.c:418
#5 0x5612bbb110e7 in repo_format_commit_message pretty.c:1869
#6 0x5612bbb12d96 in pretty_print_commit pretty.c:2161
#7 0x5612bba0a4d5 in show_log log-tree.c:781
#8 0x5612bba0d6c7 in log_tree_commit log-tree.c:1117
#9 0x5612bb691ed5 in cmd_log_walk_no_free builtin/log.c:508
#10 0x5612bb69235b in cmd_log_walk builtin/log.c:549
#11 0x5612bb6951a2 in cmd_log builtin/log.c:883
#12 0x5612bb56c993 in run_builtin git.c:466
#13 0x5612bb56d397 in handle_builtin git.c:721
git-for-windows#14 0x5612bb56db07 in run_argv git.c:788
git-for-windows#15 0x5612bb56e8a7 in cmd_main git.c:923
git-for-windows#16 0x5612bb803682 in main common-main.c:57
git-for-windows#17 0x7f95c4c3c28f (/usr/lib/libc.so.6+0x2328f)
SUMMARY: AddressSanitizer: heap-buffer-overflow /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827 in __interceptor_memcpy
Shadow bytes around the buggy address:
0x0c067fff81d0: fd fd fd fa fa fa fd fd fd fa fa fa fd fd fd fa
0x0c067fff81e0: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
0x0c067fff81f0: fd fa fa fa fd fd fd fa fa fa fd fd fd fa fa fa
0x0c067fff8200: fd fd fd fa fa fa fd fd fd fd fa fa 00 00 00 fa
0x0c067fff8210: fa fa fd fd fd fa fa fa fd fd fd fa fa fa fd fd
=>0x0c067fff8220: fd fa fa fa fd fd fd fa fa fa 00 00 00[fa]fa fa
0x0c067fff8230: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8240: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8250: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8260: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8270: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==26009==ABORTING
Now the proper fix for this would be to convert both functions to return
an `size_t` instead of an `int`. But given that this commit may be part
of a security release, let's instead do the minimal viable fix and die
in case we see an overflow.
Add a test that would have previously caused us to crash.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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A hackathon project to server object from the ODB over IPC using a long running server.
Very much a WIP.
To test:
[1] In one window, do:
[2] In another window, run a variety of git commands that will need to get objects from the ODB:
To stop the daemon, either ^C it or:
I currently do not have any tests. And it just barely works. But hey, it is Monday and this is hackathon week.