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Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull timer fixes from Ingo Molnar:
 "This includes a fix for lockups caused by incorrect nsecs related
  cleanup, and a capabilities check fix for timerfd"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  jiffies: Revert bogus conversion of NSEC_PER_SEC to TICK_NSEC
  timerfd: Only check CAP_WAKE_ALARM when it is needed
This commit is contained in:
Linus Torvalds 2017-03-07 14:45:22 -08:00
parent 609b07b72d fa3aa7a54f
commit 8a9172356f
2 changed files with 5 additions and 5 deletions
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8
fs/timerfd.c
View File

@ -400,9 +400,9 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
clockid != CLOCK_BOOTTIME_ALARM))
return -EINVAL;
if (!capable(CAP_WAKE_ALARM) &&
(clockid == CLOCK_REALTIME_ALARM ||
clockid == CLOCK_BOOTTIME_ALARM))
if ((clockid == CLOCK_REALTIME_ALARM ||
clockid == CLOCK_BOOTTIME_ALARM) &&
!capable(CAP_WAKE_ALARM))
return -EPERM;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
@ -449,7 +449,7 @@ static int do_timerfd_settime(int ufd, int flags,
return ret;
ctx = f.file->private_data;
if (!capable(CAP_WAKE_ALARM) && isalarm(ctx)) {
if (isalarm(ctx) && !capable(CAP_WAKE_ALARM)) {
fdput(f);
return -EPERM;
}

2
kernel/time/jiffies.c
View File

@ -125,7 +125,7 @@ int register_refined_jiffies(long cycles_per_second)
shift_hz += cycles_per_tick/2;
do_div(shift_hz, cycles_per_tick);
/* Calculate nsec_per_tick using shift_hz */
nsec_per_tick = (u64)TICK_NSEC << 8;
nsec_per_tick = (u64)NSEC_PER_SEC << 8;
nsec_per_tick += (u32)shift_hz/2;
do_div(nsec_per_tick, (u32)shift_hz);