diff options
author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-02-01 20:35:31 +0300 |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2008-02-10 10:48:03 +0100 |
commit | 416529374b4793ba2d2e97e736d108a2e0f3ef07 (patch) | |
tree | 2523182bf1dd501aeef28a2c578d86b95cd90683 /kernel/compat.c | |
parent | 080344b98805553f9b01de0f59a41b1533036d8d (diff) | |
download | kernel_samsung_smdk4412-416529374b4793ba2d2e97e736d108a2e0f3ef07.zip kernel_samsung_smdk4412-416529374b4793ba2d2e97e736d108a2e0f3ef07.tar.gz kernel_samsung_smdk4412-416529374b4793ba2d2e97e736d108a2e0f3ef07.tar.bz2 |
hrtimer: fix *rmtp/restarts handling in compat_sys_nanosleep()
Spotted by Pavel Emelyanov and Alexey Dobriyan.
compat_sys_nanosleep() implicitly uses hrtimer_nanosleep_restart(), this can't
work. Make a suitable compat_nanosleep_restart() helper.
Introduced by commit c70878b4e0b6cf8d2f1e46319e48e821ef4a8aba
hrtimer: hook compat_sys_nanosleep up to high res timer code
Also, set ->addr_limit = KERNEL_DS before doing hrtimer_nanosleep(), this func
was changed by the previous patch and now takes the "__user *" parameter.
Thanks to Ingo Molnar for fixing the bug in this patch.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexey Dobriyan <adobriyan@sw.ru>
Cc: Pavel Emelyanov <xemul@sw.ru>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Toyo Abe <toyoa@mvista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/compat.c')
-rw-r--r-- | kernel/compat.c | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/kernel/compat.c b/kernel/compat.c index 42a1ed4..f2a2975 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -40,10 +40,36 @@ int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; } +static long compat_nanosleep_restart(struct restart_block *restart) +{ + struct compat_timespec __user *rmtp; + struct timespec rmt; + mm_segment_t oldfs; + long ret; + + rmtp = (struct compat_timespec __user *)(restart->arg1); + restart->arg1 = (unsigned long)&rmt; + oldfs = get_fs(); + set_fs(KERNEL_DS); + ret = hrtimer_nanosleep_restart(restart); + set_fs(oldfs); + + if (ret) { + restart->fn = compat_nanosleep_restart; + restart->arg1 = (unsigned long)rmtp; + + if (rmtp && put_compat_timespec(&rmt, rmtp)) + return -EFAULT; + } + + return ret; +} + asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, struct compat_timespec __user *rmtp) { struct timespec tu, rmt; + mm_segment_t oldfs; long ret; if (get_compat_timespec(&tu, rqtp)) @@ -52,11 +78,21 @@ asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, if (!timespec_valid(&tu)) return -EINVAL; - ret = hrtimer_nanosleep(&tu, rmtp ? &rmt : NULL, HRTIMER_MODE_REL, - CLOCK_MONOTONIC); + oldfs = get_fs(); + set_fs(KERNEL_DS); + ret = hrtimer_nanosleep(&tu, + rmtp ? (struct timespec __user *)&rmt : NULL, + HRTIMER_MODE_REL, CLOCK_MONOTONIC); + set_fs(oldfs); + + if (ret) { + struct restart_block *restart + = ¤t_thread_info()->restart_block; + + restart->fn = compat_nanosleep_restart; + restart->arg1 = (unsigned long)rmtp; - if (ret && rmtp) { - if (put_compat_timespec(&rmt, rmtp)) + if (rmtp && put_compat_timespec(&rmt, rmtp)) return -EFAULT; } |