(#1734400) analyze-security: fix potential division by zero #13
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Upstream PR: systemd/systemd#13238 Resolves: #1734400
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mrc0mmand
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Nov 27, 2019
This is a follow-up to 8857fb9 that prevents the fuzzer from crashing with ``` ==220==ERROR: AddressSanitizer: ABRT on unknown address 0x0000000000dc (pc 0x7ff4953c8428 bp 0x7ffcf66ec290 sp 0x7ffcf66ec128 T0) SCARINESS: 10 (signal) #0 0x7ff4953c8427 in gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x35427) redhat-plumbers#1 0x7ff4953ca029 in abort (/lib/x86_64-linux-gnu/libc.so.6+0x37029) redhat-plumbers#2 0x7ff49666503a in log_assert_failed_realm /work/build/../../src/systemd/src/basic/log.c:805:9 redhat-plumbers#3 0x7ff496614ecf in safe_close /work/build/../../src/systemd/src/basic/fd-util.c:66:17 redhat-plumbers#4 0x548806 in server_done /work/build/../../src/systemd/src/journal/journald-server.c:2064:9 redhat-plumbers#5 0x5349fa in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/fuzz/fuzz-journald-kmsg.c:26:9 redhat-plumbers#6 0x592755 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/libfuzzer/FuzzerLoop.cpp:571:15 redhat-plumbers#7 0x590627 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*) /src/libfuzzer/FuzzerLoop.cpp:480:3 redhat-plumbers#8 0x594432 in fuzzer::Fuzzer::MutateAndTestOne() /src/libfuzzer/FuzzerLoop.cpp:708:19 redhat-plumbers#9 0x5973c6 in fuzzer::Fuzzer::Loop(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, fuzzer::fuzzer_allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&) /src/libfuzzer/FuzzerLoop.cpp:839:5 redhat-plumbers#10 0x574541 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/libfuzzer/FuzzerDriver.cpp:764:6 redhat-plumbers#11 0x5675fc in main /src/libfuzzer/FuzzerMain.cpp:20:10 redhat-plumbers#12 0x7ff4953b382f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) redhat-plumbers#13 0x420f58 in _start (/out/fuzz-journald-kmsg+0x420f58) ``` (cherry picked from commit cc55ac0) Resolves: #1764560
systemd-rhel-bot
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Dec 3, 2019
This is a follow-up to 8857fb9 that prevents the fuzzer from crashing with ``` ==220==ERROR: AddressSanitizer: ABRT on unknown address 0x0000000000dc (pc 0x7ff4953c8428 bp 0x7ffcf66ec290 sp 0x7ffcf66ec128 T0) SCARINESS: 10 (signal) #0 0x7ff4953c8427 in gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x35427) #1 0x7ff4953ca029 in abort (/lib/x86_64-linux-gnu/libc.so.6+0x37029) #2 0x7ff49666503a in log_assert_failed_realm /work/build/../../src/systemd/src/basic/log.c:805:9 #3 0x7ff496614ecf in safe_close /work/build/../../src/systemd/src/basic/fd-util.c:66:17 #4 0x548806 in server_done /work/build/../../src/systemd/src/journal/journald-server.c:2064:9 #5 0x5349fa in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/fuzz/fuzz-journald-kmsg.c:26:9 #6 0x592755 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/libfuzzer/FuzzerLoop.cpp:571:15 #7 0x590627 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*) /src/libfuzzer/FuzzerLoop.cpp:480:3 #8 0x594432 in fuzzer::Fuzzer::MutateAndTestOne() /src/libfuzzer/FuzzerLoop.cpp:708:19 #9 0x5973c6 in fuzzer::Fuzzer::Loop(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, fuzzer::fuzzer_allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&) /src/libfuzzer/FuzzerLoop.cpp:839:5 #10 0x574541 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/libfuzzer/FuzzerDriver.cpp:764:6 #11 0x5675fc in main /src/libfuzzer/FuzzerMain.cpp:20:10 #12 0x7ff4953b382f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) #13 0x420f58 in _start (/out/fuzz-journald-kmsg+0x420f58) ``` (cherry picked from commit cc55ac0) Resolves: #1764560
msekletar
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Dec 22, 2023
I had a test machine with ulimit -n set to 1073741816 through pam
("session required pam_limits.so set_all", which copies the limits from PID 1,
left over from testing of #10921).
test-execute would "hang" and then fail with a timeout when running
exec-inaccessiblepaths-proc.service. It turns out that the problem was in
close_all_fds(), which would go to the fallback path of doing close()
1073741813 times. Let's just fail if we hit this case. This only matters
for cases where both /proc is inaccessible, and the *soft* limit has been
raised.
(gdb) bt
#0 0x00007f7e2e73fdc8 in close () from target:/lib64/libc.so.6
redhat-plumbers#1 0x00007f7e2e42cdfd in close_nointr ()
from target:/home/zbyszek/src/systemd-work3/build-rawhide/src/shared/libsystemd-shared-241.so
redhat-plumbers#2 0x00007f7e2e42d525 in close_all_fds ()
from target:/home/zbyszek/src/systemd-work3/build-rawhide/src/shared/libsystemd-shared-241.so
redhat-plumbers#3 0x0000000000426e53 in exec_child ()
redhat-plumbers#4 0x0000000000429578 in exec_spawn ()
redhat-plumbers#5 0x00000000004ce1ab in service_spawn ()
redhat-plumbers#6 0x00000000004cff77 in service_enter_start ()
redhat-plumbers#7 0x00000000004d028f in service_enter_start_pre ()
redhat-plumbers#8 0x00000000004d16f2 in service_start ()
redhat-plumbers#9 0x00000000004568f4 in unit_start ()
redhat-plumbers#10 0x0000000000416987 in test ()
redhat-plumbers#11 0x0000000000417632 in test_exec_inaccessiblepaths ()
redhat-plumbers#12 0x0000000000419362 in run_tests ()
redhat-plumbers#13 0x0000000000419632 in main ()
(cherry picked from commit 6a461d1)
Related: RHEL-18302
msekletar
pushed a commit
to msekletar/systemd-rhel8
that referenced
this pull request
Dec 22, 2023
I had a test machine with ulimit -n set to 1073741816 through pam
("session required pam_limits.so set_all", which copies the limits from PID 1,
left over from testing of #10921).
test-execute would "hang" and then fail with a timeout when running
exec-inaccessiblepaths-proc.service. It turns out that the problem was in
close_all_fds(), which would go to the fallback path of doing close()
1073741813 times. Let's just fail if we hit this case. This only matters
for cases where both /proc is inaccessible, and the *soft* limit has been
raised.
(gdb) bt
#0 0x00007f7e2e73fdc8 in close () from target:/lib64/libc.so.6
redhat-plumbers#1 0x00007f7e2e42cdfd in close_nointr ()
from target:/home/zbyszek/src/systemd-work3/build-rawhide/src/shared/libsystemd-shared-241.so
redhat-plumbers#2 0x00007f7e2e42d525 in close_all_fds ()
from target:/home/zbyszek/src/systemd-work3/build-rawhide/src/shared/libsystemd-shared-241.so
redhat-plumbers#3 0x0000000000426e53 in exec_child ()
redhat-plumbers#4 0x0000000000429578 in exec_spawn ()
redhat-plumbers#5 0x00000000004ce1ab in service_spawn ()
redhat-plumbers#6 0x00000000004cff77 in service_enter_start ()
redhat-plumbers#7 0x00000000004d028f in service_enter_start_pre ()
redhat-plumbers#8 0x00000000004d16f2 in service_start ()
redhat-plumbers#9 0x00000000004568f4 in unit_start ()
redhat-plumbers#10 0x0000000000416987 in test ()
redhat-plumbers#11 0x0000000000417632 in test_exec_inaccessiblepaths ()
redhat-plumbers#12 0x0000000000419362 in run_tests ()
redhat-plumbers#13 0x0000000000419632 in main ()
(cherry picked from commit 6a461d1)
Related: RHEL-18302
msekletar
pushed a commit
to msekletar/systemd-rhel8
that referenced
this pull request
Dec 22, 2023
I had a test machine with ulimit -n set to 1073741816 through pam
("session required pam_limits.so set_all", which copies the limits from PID 1,
left over from testing of #10921).
test-execute would "hang" and then fail with a timeout when running
exec-inaccessiblepaths-proc.service. It turns out that the problem was in
close_all_fds(), which would go to the fallback path of doing close()
1073741813 times. Let's just fail if we hit this case. This only matters
for cases where both /proc is inaccessible, and the *soft* limit has been
raised.
(gdb) bt
#0 0x00007f7e2e73fdc8 in close () from target:/lib64/libc.so.6
redhat-plumbers#1 0x00007f7e2e42cdfd in close_nointr ()
from target:/home/zbyszek/src/systemd-work3/build-rawhide/src/shared/libsystemd-shared-241.so
redhat-plumbers#2 0x00007f7e2e42d525 in close_all_fds ()
from target:/home/zbyszek/src/systemd-work3/build-rawhide/src/shared/libsystemd-shared-241.so
redhat-plumbers#3 0x0000000000426e53 in exec_child ()
redhat-plumbers#4 0x0000000000429578 in exec_spawn ()
redhat-plumbers#5 0x00000000004ce1ab in service_spawn ()
redhat-plumbers#6 0x00000000004cff77 in service_enter_start ()
redhat-plumbers#7 0x00000000004d028f in service_enter_start_pre ()
redhat-plumbers#8 0x00000000004d16f2 in service_start ()
redhat-plumbers#9 0x00000000004568f4 in unit_start ()
redhat-plumbers#10 0x0000000000416987 in test ()
redhat-plumbers#11 0x0000000000417632 in test_exec_inaccessiblepaths ()
redhat-plumbers#12 0x0000000000419362 in run_tests ()
redhat-plumbers#13 0x0000000000419632 in main ()
(cherry picked from commit 6a461d1)
Related: RHEL-18302
github-actions bot
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that referenced
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Jan 8, 2024
I had a test machine with ulimit -n set to 1073741816 through pam
("session required pam_limits.so set_all", which copies the limits from PID 1,
left over from testing of #10921).
test-execute would "hang" and then fail with a timeout when running
exec-inaccessiblepaths-proc.service. It turns out that the problem was in
close_all_fds(), which would go to the fallback path of doing close()
1073741813 times. Let's just fail if we hit this case. This only matters
for cases where both /proc is inaccessible, and the *soft* limit has been
raised.
(gdb) bt
#0 0x00007f7e2e73fdc8 in close () from target:/lib64/libc.so.6
#1 0x00007f7e2e42cdfd in close_nointr ()
from target:/home/zbyszek/src/systemd-work3/build-rawhide/src/shared/libsystemd-shared-241.so
#2 0x00007f7e2e42d525 in close_all_fds ()
from target:/home/zbyszek/src/systemd-work3/build-rawhide/src/shared/libsystemd-shared-241.so
#3 0x0000000000426e53 in exec_child ()
#4 0x0000000000429578 in exec_spawn ()
#5 0x00000000004ce1ab in service_spawn ()
#6 0x00000000004cff77 in service_enter_start ()
#7 0x00000000004d028f in service_enter_start_pre ()
#8 0x00000000004d16f2 in service_start ()
#9 0x00000000004568f4 in unit_start ()
#10 0x0000000000416987 in test ()
#11 0x0000000000417632 in test_exec_inaccessiblepaths ()
#12 0x0000000000419362 in run_tests ()
#13 0x0000000000419632 in main ()
(cherry picked from commit 6a461d1)
Related: RHEL-18302
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Upstream PR: systemd/systemd#13238
Resolves: #1734400