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| author | zhongjiang <zhongjiang@huawei.com> | 2017-07-10 15:52:57 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 07:47:29 +0200 |
| commit | 50ecbf90142cbfc7cc0194d4f71cf9673e03ab33 (patch) | |
| tree | 9caeee246313b752367b095e4afe53d76df9d8a2 /kernel | |
| parent | bbab099bb86bb3ae9acd316879fa27647bdb4dab (diff) | |
| download | linux-stable-50ecbf90142cbfc7cc0194d4f71cf9673e03ab33.tar.gz linux-stable-50ecbf90142cbfc7cc0194d4f71cf9673e03ab33.tar.bz2 linux-stable-50ecbf90142cbfc7cc0194d4f71cf9673e03ab33.zip | |
kernel/signal.c: avoid undefined behaviour in kill_something_info
commit 4ea77014af0d6205b05503d1c7aac6eace11d473 upstream.
When running kill(72057458746458112, 0) in userspace I hit the following
issue.
UBSAN: Undefined behaviour in kernel/signal.c:1462:11
negation of -2147483648 cannot be represented in type 'int':
CPU: 226 PID: 9849 Comm: test Tainted: G B ---- ------- 3.10.0-327.53.58.70.x86_64_ubsan+ #116
Hardware name: Huawei Technologies Co., Ltd. RH8100 V3/BC61PBIA, BIOS BLHSV028 11/11/2014
Call Trace:
dump_stack+0x19/0x1b
ubsan_epilogue+0xd/0x50
__ubsan_handle_negate_overflow+0x109/0x14e
SYSC_kill+0x43e/0x4d0
SyS_kill+0xe/0x10
system_call_fastpath+0x16/0x1b
Add code to avoid the UBSAN detection.
[akpm@linux-foundation.org: tweak comment]
Link: http://lkml.kernel.org/r/1496670008-59084-1-git-send-email-zhongjiang@huawei.com
Signed-off-by: zhongjiang <zhongjiang@huawei.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/signal.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index b7df30e8066c..839504ac04d5 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1435,6 +1435,10 @@ static int kill_something_info(int sig, struct siginfo *info, pid_t pid) return ret; } + /* -INT_MIN is undefined. Exclude this case to avoid a UBSAN warning */ + if (pid == INT_MIN) + return -ESRCH; + read_lock(&tasklist_lock); if (pid != -1) { ret = __kill_pgrp_info(sig, info, |