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author | Zeng Tao | 2020-09-01 17:30:13 +0800 |
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committer | Thomas Gleixner | 2020-10-26 11:48:11 +0100 |
commit | cb47755725da7b90fecbb2aa82ac3b24a7adb89b (patch) | |
tree | d1480795667ccb9760ea9b5fe6f36df8f6028aee /include/linux/jiffies.h | |
parent | 9010e3876e1c3f7b1c3769bee519d6a871589aca (diff) |
time: Prevent undefined behaviour in timespec64_to_ns()
UBSAN reports:
Undefined behaviour in ./include/linux/time64.h:127:27
signed integer overflow:
17179869187 * 1000000000 cannot be represented in type 'long long int'
Call Trace:
timespec64_to_ns include/linux/time64.h:127 [inline]
set_cpu_itimer+0x65c/0x880 kernel/time/itimer.c:180
do_setitimer+0x8e/0x740 kernel/time/itimer.c:245
__x64_sys_setitimer+0x14c/0x2c0 kernel/time/itimer.c:336
do_syscall_64+0xa1/0x540 arch/x86/entry/common.c:295
Commit bd40a175769d ("y2038: itimer: change implementation to timespec64")
replaced the original conversion which handled time clamping correctly with
timespec64_to_ns() which has no overflow protection.
Fix it in timespec64_to_ns() as this is not necessarily limited to the
usage in itimers.
[ tglx: Added comment and adjusted the fixes tag ]
Fixes: 361a3bf00582 ("time64: Add time64.h header and define struct timespec64")
Signed-off-by: Zeng Tao <prime.zeng@hisilicon.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/1598952616-6416-1-git-send-email-prime.zeng@hisilicon.com
Diffstat (limited to 'include/linux/jiffies.h')
0 files changed, 0 insertions, 0 deletions