Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

-Wmisleading-indentation in ipc/msg.c #829

Closed
nathanchance opened this issue Dec 18, 2019 · 1 comment
Closed

-Wmisleading-indentation in ipc/msg.c #829

nathanchance opened this issue Dec 18, 2019 · 1 comment

Comments

@nathanchance
Copy link
Member

@nathanchance nathanchance commented Dec 18, 2019

../ipc/msg.c:621:4: warning: misleading indentation; statement is not part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm, msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

Patch submitted: https://lore.kernel.org/lkml/20191218032932.37479-1-natechancellor@gmail.com

@nathanchance nathanchance self-assigned this Dec 18, 2019
hnaz added a commit to hnaz/linux-mm that referenced this issue Jan 3, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
@nathanchance

This comment has been minimized.

Copy link
Member Author

@nathanchance nathanchance commented Jan 5, 2020

No longer relevant after llvm/llvm-project@b4b904e.

fengguang pushed a commit to 0day-ci/linux that referenced this issue Jan 6, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
hnaz added a commit to hnaz/linux-mm that referenced this issue Jan 8, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
ruscur pushed a commit to ruscur/linux that referenced this issue Jan 8, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
hnaz added a commit to hnaz/linux-mm that referenced this issue Jan 10, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
ruscur pushed a commit to ruscur/linux that referenced this issue Jan 10, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
hnaz added a commit to hnaz/linux-mm that referenced this issue Jan 10, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
hnaz added a commit to hnaz/linux-mm that referenced this issue Jan 14, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
ruscur pushed a commit to ruscur/linux that referenced this issue Jan 14, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
hnaz added a commit to hnaz/linux-mm that referenced this issue Jan 15, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
ruscur pushed a commit to ruscur/linux that referenced this issue Jan 15, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
hnaz added a commit to hnaz/linux-mm that referenced this issue Jan 17, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
ruscur pushed a commit to ruscur/linux3 that referenced this issue Jan 22, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux/linux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
hnaz added a commit to hnaz/linux-mm that referenced this issue Jan 23, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
hnaz added a commit to hnaz/linux-mm that referenced this issue Jan 24, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
ruscur pushed a commit to ruscur/linux that referenced this issue Jan 24, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
hnaz added a commit to hnaz/linux-mm that referenced this issue Jan 29, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
ruscur pushed a commit to ruscur/linux that referenced this issue Jan 30, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
ruscur pushed a commit to ruscur/linux that referenced this issue Feb 3, 2020
Clang warns:

../ipc/msg.c:621:4: warning: misleading indentation; statement is not
part of the previous 'if' [-Wmisleading-indentation]
                 return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm,
msqid64.msg_qbytes);
                 ^
../ipc/msg.c:619:3: note: previous statement is here
                if (copy_msqid_from_user(&msqid64, buf, version))
                ^
1 warning generated.

This warning occurs because there is a space after the tab on this line.
Remove it so that the indentation is consistent with the Linux kernel
coding style and clang no longer warns.

Link: ClangBuiltLinux#829
Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
hnaz added a commit to hnaz/linux-mm that referenced this issue Feb 4, 2020
A use of uninitialized memory in msgctl_down() because msqid64 in
ksys_msgctl hasn't been initialized.  The local | msqid64 | is created in
ksys_msgctl() and then passed into msgctl_down().  Along the way msqid64
is never initialized before msgctl_down() checks msqid64->msg_qbytes.

KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool)
reports:

==================================================================
BUG: KUMSAN: use of uninitialized memory in msgctl_down+0x94/0x300
Read of size 8 at addr ffff88806bb97eb8 by task syz-executor707/2022

CPU: 0 PID: 2022 Comm: syz-executor707 Not tainted 5.2.0-rc4+ torvalds#63
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
 dump_stack+0x75/0xae
 __kumsan_report+0x17c/0x3e6
 kumsan_report+0xe/0x20
 msgctl_down+0x94/0x300
 ksys_msgctl.constprop.14+0xef/0x260
 do_syscall_64+0x7e/0x1f0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4400e9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd869e0598 EFLAGS: 00000246 ORIG_RAX: 0000000000000047
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401970
R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001aee5c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffffff01ae0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kumsan: bad access detected
==================================================================

Syzkaller reproducer:
msgctl$IPC_RMID(0x0, 0x0)

C reproducer:
// autogenerated by syzkaller (https://github.com/google/syzkaller)

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  syscall(__NR_msgctl, 0, 0, 0);
  return 0;
}

[natechancellor@gmail.com: adjust indentation in ksys_msgctl]
  Link: ClangBuiltLinux#829
  Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Link: http://lkml.kernel.org/r/20190613014044.24234-1-shuaibinglu@126.com
Signed-off-by: Lu Shuaibing <shuaibinglu@126.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: NeilBrown <neilb@suse.com>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: drivers/block/null_blk_main.c: fix layout

Each line here overflows 80 cols by exactly one character.  Delete one tab
per line to fix.

Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
torvalds added a commit to torvalds/linux that referenced this issue Feb 4, 2020
A use of uninitialized memory in msgctl_down() because msqid64 in
ksys_msgctl hasn't been initialized.  The local | msqid64 | is created in
ksys_msgctl() and then passed into msgctl_down().  Along the way msqid64
is never initialized before msgctl_down() checks msqid64->msg_qbytes.

KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool)
reports:

==================================================================
BUG: KUMSAN: use of uninitialized memory in msgctl_down+0x94/0x300
Read of size 8 at addr ffff88806bb97eb8 by task syz-executor707/2022

CPU: 0 PID: 2022 Comm: syz-executor707 Not tainted 5.2.0-rc4+ #63
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
 dump_stack+0x75/0xae
 __kumsan_report+0x17c/0x3e6
 kumsan_report+0xe/0x20
 msgctl_down+0x94/0x300
 ksys_msgctl.constprop.14+0xef/0x260
 do_syscall_64+0x7e/0x1f0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4400e9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd869e0598 EFLAGS: 00000246 ORIG_RAX: 0000000000000047
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401970
R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001aee5c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffffff01ae0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kumsan: bad access detected
==================================================================

Syzkaller reproducer:
msgctl$IPC_RMID(0x0, 0x0)

C reproducer:
// autogenerated by syzkaller (https://github.com/google/syzkaller)

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  syscall(__NR_msgctl, 0, 0, 0);
  return 0;
}

[natechancellor@gmail.com: adjust indentation in ksys_msgctl]
  Link: ClangBuiltLinux#829
  Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Link: http://lkml.kernel.org/r/20190613014044.24234-1-shuaibinglu@126.com
Signed-off-by: Lu Shuaibing <shuaibinglu@126.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: NeilBrown <neilb@suse.com>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: drivers/block/null_blk_main.c: fix layout

Each line here overflows 80 cols by exactly one character.  Delete one tab
per line to fix.

Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mrchapp pushed a commit to mrchapp/linux that referenced this issue Feb 10, 2020
commit 889b331 upstream.

A use of uninitialized memory in msgctl_down() because msqid64 in
ksys_msgctl hasn't been initialized.  The local | msqid64 | is created in
ksys_msgctl() and then passed into msgctl_down().  Along the way msqid64
is never initialized before msgctl_down() checks msqid64->msg_qbytes.

KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool)
reports:

==================================================================
BUG: KUMSAN: use of uninitialized memory in msgctl_down+0x94/0x300
Read of size 8 at addr ffff88806bb97eb8 by task syz-executor707/2022

CPU: 0 PID: 2022 Comm: syz-executor707 Not tainted 5.2.0-rc4+ torvalds#63
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
 dump_stack+0x75/0xae
 __kumsan_report+0x17c/0x3e6
 kumsan_report+0xe/0x20
 msgctl_down+0x94/0x300
 ksys_msgctl.constprop.14+0xef/0x260
 do_syscall_64+0x7e/0x1f0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4400e9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd869e0598 EFLAGS: 00000246 ORIG_RAX: 0000000000000047
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401970
R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001aee5c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffffff01ae0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kumsan: bad access detected
==================================================================

Syzkaller reproducer:
msgctl$IPC_RMID(0x0, 0x0)

C reproducer:
// autogenerated by syzkaller (https://github.com/google/syzkaller)

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  syscall(__NR_msgctl, 0, 0, 0);
  return 0;
}

[natechancellor@gmail.com: adjust indentation in ksys_msgctl]
  Link: ClangBuiltLinux#829
  Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Link: http://lkml.kernel.org/r/20190613014044.24234-1-shuaibinglu@126.com
Signed-off-by: Lu Shuaibing <shuaibinglu@126.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: NeilBrown <neilb@suse.com>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: ipc/msg.c: consolidate all xxxctl_down() functions

Each line here overflows 80 cols by exactly one character.  Delete one tab
per line to fix.

Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
mrchapp pushed a commit to mrchapp/linux that referenced this issue Feb 10, 2020
commit 889b331 upstream.

A use of uninitialized memory in msgctl_down() because msqid64 in
ksys_msgctl hasn't been initialized.  The local | msqid64 | is created in
ksys_msgctl() and then passed into msgctl_down().  Along the way msqid64
is never initialized before msgctl_down() checks msqid64->msg_qbytes.

KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool)
reports:

==================================================================
BUG: KUMSAN: use of uninitialized memory in msgctl_down+0x94/0x300
Read of size 8 at addr ffff88806bb97eb8 by task syz-executor707/2022

CPU: 0 PID: 2022 Comm: syz-executor707 Not tainted 5.2.0-rc4+ torvalds#63
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
 dump_stack+0x75/0xae
 __kumsan_report+0x17c/0x3e6
 kumsan_report+0xe/0x20
 msgctl_down+0x94/0x300
 ksys_msgctl.constprop.14+0xef/0x260
 do_syscall_64+0x7e/0x1f0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4400e9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd869e0598 EFLAGS: 00000246 ORIG_RAX: 0000000000000047
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401970
R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001aee5c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffffff01ae0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kumsan: bad access detected
==================================================================

Syzkaller reproducer:
msgctl$IPC_RMID(0x0, 0x0)

C reproducer:
// autogenerated by syzkaller (https://github.com/google/syzkaller)

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  syscall(__NR_msgctl, 0, 0, 0);
  return 0;
}

[natechancellor@gmail.com: adjust indentation in ksys_msgctl]
  Link: ClangBuiltLinux#829
  Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Link: http://lkml.kernel.org/r/20190613014044.24234-1-shuaibinglu@126.com
Signed-off-by: Lu Shuaibing <shuaibinglu@126.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: NeilBrown <neilb@suse.com>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: ipc/msg.c: consolidate all xxxctl_down() functions

Each line here overflows 80 cols by exactly one character.  Delete one tab
per line to fix.

Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
mrchapp pushed a commit to mrchapp/linux that referenced this issue Feb 10, 2020
commit 889b331 upstream.

A use of uninitialized memory in msgctl_down() because msqid64 in
ksys_msgctl hasn't been initialized.  The local | msqid64 | is created in
ksys_msgctl() and then passed into msgctl_down().  Along the way msqid64
is never initialized before msgctl_down() checks msqid64->msg_qbytes.

KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool)
reports:

==================================================================
BUG: KUMSAN: use of uninitialized memory in msgctl_down+0x94/0x300
Read of size 8 at addr ffff88806bb97eb8 by task syz-executor707/2022

CPU: 0 PID: 2022 Comm: syz-executor707 Not tainted 5.2.0-rc4+ torvalds#63
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
 dump_stack+0x75/0xae
 __kumsan_report+0x17c/0x3e6
 kumsan_report+0xe/0x20
 msgctl_down+0x94/0x300
 ksys_msgctl.constprop.14+0xef/0x260
 do_syscall_64+0x7e/0x1f0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4400e9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd869e0598 EFLAGS: 00000246 ORIG_RAX: 0000000000000047
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401970
R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001aee5c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffffff01ae0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kumsan: bad access detected
==================================================================

Syzkaller reproducer:
msgctl$IPC_RMID(0x0, 0x0)

C reproducer:
// autogenerated by syzkaller (https://github.com/google/syzkaller)

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  syscall(__NR_msgctl, 0, 0, 0);
  return 0;
}

[natechancellor@gmail.com: adjust indentation in ksys_msgctl]
  Link: ClangBuiltLinux#829
  Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Link: http://lkml.kernel.org/r/20190613014044.24234-1-shuaibinglu@126.com
Signed-off-by: Lu Shuaibing <shuaibinglu@126.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: NeilBrown <neilb@suse.com>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: ipc/msg.c: consolidate all xxxctl_down() functions

Each line here overflows 80 cols by exactly one character.  Delete one tab
per line to fix.

Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Whissi pushed a commit to Whissi/linux-stable that referenced this issue Feb 11, 2020
commit 889b331 upstream.

A use of uninitialized memory in msgctl_down() because msqid64 in
ksys_msgctl hasn't been initialized.  The local | msqid64 | is created in
ksys_msgctl() and then passed into msgctl_down().  Along the way msqid64
is never initialized before msgctl_down() checks msqid64->msg_qbytes.

KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool)
reports:

==================================================================
BUG: KUMSAN: use of uninitialized memory in msgctl_down+0x94/0x300
Read of size 8 at addr ffff88806bb97eb8 by task syz-executor707/2022

CPU: 0 PID: 2022 Comm: syz-executor707 Not tainted 5.2.0-rc4+ #63
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
 dump_stack+0x75/0xae
 __kumsan_report+0x17c/0x3e6
 kumsan_report+0xe/0x20
 msgctl_down+0x94/0x300
 ksys_msgctl.constprop.14+0xef/0x260
 do_syscall_64+0x7e/0x1f0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4400e9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd869e0598 EFLAGS: 00000246 ORIG_RAX: 0000000000000047
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401970
R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001aee5c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffffff01ae0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kumsan: bad access detected
==================================================================

Syzkaller reproducer:
msgctl$IPC_RMID(0x0, 0x0)

C reproducer:
// autogenerated by syzkaller (https://github.com/google/syzkaller)

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  syscall(__NR_msgctl, 0, 0, 0);
  return 0;
}

[natechancellor@gmail.com: adjust indentation in ksys_msgctl]
  Link: ClangBuiltLinux/linux#829
  Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Link: http://lkml.kernel.org/r/20190613014044.24234-1-shuaibinglu@126.com
Signed-off-by: Lu Shuaibing <shuaibinglu@126.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: NeilBrown <neilb@suse.com>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: ipc/msg.c: consolidate all xxxctl_down() functions

Each line here overflows 80 cols by exactly one character.  Delete one tab
per line to fix.

Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Whissi pushed a commit to Whissi/linux-stable that referenced this issue Feb 11, 2020
commit 889b331 upstream.

A use of uninitialized memory in msgctl_down() because msqid64 in
ksys_msgctl hasn't been initialized.  The local | msqid64 | is created in
ksys_msgctl() and then passed into msgctl_down().  Along the way msqid64
is never initialized before msgctl_down() checks msqid64->msg_qbytes.

KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool)
reports:

==================================================================
BUG: KUMSAN: use of uninitialized memory in msgctl_down+0x94/0x300
Read of size 8 at addr ffff88806bb97eb8 by task syz-executor707/2022

CPU: 0 PID: 2022 Comm: syz-executor707 Not tainted 5.2.0-rc4+ #63
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
 dump_stack+0x75/0xae
 __kumsan_report+0x17c/0x3e6
 kumsan_report+0xe/0x20
 msgctl_down+0x94/0x300
 ksys_msgctl.constprop.14+0xef/0x260
 do_syscall_64+0x7e/0x1f0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4400e9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd869e0598 EFLAGS: 00000246 ORIG_RAX: 0000000000000047
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401970
R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001aee5c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffffff01ae0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kumsan: bad access detected
==================================================================

Syzkaller reproducer:
msgctl$IPC_RMID(0x0, 0x0)

C reproducer:
// autogenerated by syzkaller (https://github.com/google/syzkaller)

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  syscall(__NR_msgctl, 0, 0, 0);
  return 0;
}

[natechancellor@gmail.com: adjust indentation in ksys_msgctl]
  Link: ClangBuiltLinux/linux#829
  Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Link: http://lkml.kernel.org/r/20190613014044.24234-1-shuaibinglu@126.com
Signed-off-by: Lu Shuaibing <shuaibinglu@126.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: NeilBrown <neilb@suse.com>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: ipc/msg.c: consolidate all xxxctl_down() functions

Each line here overflows 80 cols by exactly one character.  Delete one tab
per line to fix.

Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Whissi pushed a commit to Whissi/linux-stable that referenced this issue Feb 11, 2020
commit 889b331 upstream.

A use of uninitialized memory in msgctl_down() because msqid64 in
ksys_msgctl hasn't been initialized.  The local | msqid64 | is created in
ksys_msgctl() and then passed into msgctl_down().  Along the way msqid64
is never initialized before msgctl_down() checks msqid64->msg_qbytes.

KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool)
reports:

==================================================================
BUG: KUMSAN: use of uninitialized memory in msgctl_down+0x94/0x300
Read of size 8 at addr ffff88806bb97eb8 by task syz-executor707/2022

CPU: 0 PID: 2022 Comm: syz-executor707 Not tainted 5.2.0-rc4+ #63
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
 dump_stack+0x75/0xae
 __kumsan_report+0x17c/0x3e6
 kumsan_report+0xe/0x20
 msgctl_down+0x94/0x300
 ksys_msgctl.constprop.14+0xef/0x260
 do_syscall_64+0x7e/0x1f0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4400e9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd869e0598 EFLAGS: 00000246 ORIG_RAX: 0000000000000047
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401970
R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001aee5c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffffff01ae0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kumsan: bad access detected
==================================================================

Syzkaller reproducer:
msgctl$IPC_RMID(0x0, 0x0)

C reproducer:
// autogenerated by syzkaller (https://github.com/google/syzkaller)

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  syscall(__NR_msgctl, 0, 0, 0);
  return 0;
}

[natechancellor@gmail.com: adjust indentation in ksys_msgctl]
  Link: ClangBuiltLinux/linux#829
  Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Link: http://lkml.kernel.org/r/20190613014044.24234-1-shuaibinglu@126.com
Signed-off-by: Lu Shuaibing <shuaibinglu@126.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: NeilBrown <neilb@suse.com>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: ipc/msg.c: consolidate all xxxctl_down() functions

Each line here overflows 80 cols by exactly one character.  Delete one tab
per line to fix.

Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
mrchapp pushed a commit to mrchapp/linux that referenced this issue Feb 11, 2020
commit 889b331 upstream.

A use of uninitialized memory in msgctl_down() because msqid64 in
ksys_msgctl hasn't been initialized.  The local | msqid64 | is created in
ksys_msgctl() and then passed into msgctl_down().  Along the way msqid64
is never initialized before msgctl_down() checks msqid64->msg_qbytes.

KUMSAN(KernelUninitializedMemorySantizer, a new error detection tool)
reports:

==================================================================
BUG: KUMSAN: use of uninitialized memory in msgctl_down+0x94/0x300
Read of size 8 at addr ffff88806bb97eb8 by task syz-executor707/2022

CPU: 0 PID: 2022 Comm: syz-executor707 Not tainted 5.2.0-rc4+ torvalds#63
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
 dump_stack+0x75/0xae
 __kumsan_report+0x17c/0x3e6
 kumsan_report+0xe/0x20
 msgctl_down+0x94/0x300
 ksys_msgctl.constprop.14+0xef/0x260
 do_syscall_64+0x7e/0x1f0
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4400e9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd869e0598 EFLAGS: 00000246 ORIG_RAX: 0000000000000047
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401970
R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0001aee5c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 ffffffff01ae0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kumsan: bad access detected
==================================================================

Syzkaller reproducer:
msgctl$IPC_RMID(0x0, 0x0)

C reproducer:
// autogenerated by syzkaller (https://github.com/google/syzkaller)

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  syscall(__NR_msgctl, 0, 0, 0);
  return 0;
}

[natechancellor@gmail.com: adjust indentation in ksys_msgctl]
  Link: ClangBuiltLinux#829
  Link: http://lkml.kernel.org/r/20191218032932.37479-1-natechancellor@gmail.com
Link: http://lkml.kernel.org/r/20190613014044.24234-1-shuaibinglu@126.com
Signed-off-by: Lu Shuaibing <shuaibinglu@126.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: NeilBrown <neilb@suse.com>
From: Andrew Morton <akpm@linux-foundation.org>
Subject: ipc/msg.c: consolidate all xxxctl_down() functions

Each line here overflows 80 cols by exactly one character.  Delete one tab
per line to fix.

Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Projects
None yet
Linked pull requests

Successfully merging a pull request may close this issue.

None yet
1 participant
You can’t perform that action at this time.