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| author | zengtao <prime.zeng@huawei.com> | 2016-02-02 11:38:34 +0800 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2016-02-25 00:18:42 +0000 |
| commit | ac021f91916c822d9769c80dac7fcdc79679aeee (patch) | |
| tree | 589de6e5c5b2b1f3447ceb06053e32009ea3e994 /kernel | |
| parent | c584e5333a9c130393186d16abe6efec624c7c3b (diff) | |
cputime: Prevent 32bit overflow in time[val|spec]_to_cputime()
commit 0f26922fe5dc5724b1adbbd54b21bad03590b4f3 upstream.
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 <prime.zeng@huawei.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Cc: <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1454384314-154784-1-git-send-email-prime.zeng@huawei.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions