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| author | zengtao <[email protected]> | 2016-02-02 03:38:34 +0000 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2016-02-02 14:24:38 +0000 |
| commit | 0f26922fe5dc5724b1adbbd54b21bad03590b4f3 (patch) | |
| tree | 334714e7872924ab59fe5783d9e6805eb8db9c82 /fs/btrfs/dev-replace.c | |
| parent | Linux 4.5-rc2 (diff) | |
| download | kernel-0f26922fe5dc5724b1adbbd54b21bad03590b4f3.tar.gz kernel-0f26922fe5dc5724b1adbbd54b21bad03590b4f3.zip | |
cputime: Prevent 32bit overflow in time[val|spec]_to_cputime()
The datatype __kernel_time_t is u32 on 32bit platform, so its subject to
overflows in the timeval/timespec to cputime conversion.
Currently the following functions are affected:
1. setitimer()
2. timer_create/timer_settime()
3. sys_clock_nanosleep
This can happen on MIPS32 and ARM32 with "Full dynticks CPU time accounting"
enabled, which is required for CONFIG_NO_HZ_FULL.
Enforce u64 conversion to prevent the overflow.
Fixes: 31c1fc818715 ("ARM: Kconfig: allow full nohz CPU accounting")
Signed-off-by: zengtao <[email protected]>
Reviewed-by: Arnd Bergmann <[email protected]>
Cc: <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
Diffstat (limited to 'fs/btrfs/dev-replace.c')
0 files changed, 0 insertions, 0 deletions