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timerfd: add flags check

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As requested by Michael, add a missing check for valid flags in
timerfd_settime(), and make it return EINVAL in case some extra bits are
set.

Michael said:
If this is to be any use to userland apps that want to check flag
support (perhaps it is too late already), then the sooner we get it
into the kernel the better: 2.6.29 would be good; earlier stables as
well would be even better.

[akpm@linux-foundation.org: remove unused TFD_FLAGS_SET]
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Cc: <stable@kernel.org>		[2.6.27.x, 2.6.28.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davide Libenzi
2009-02-18 14:48:18 -08:00
committed by Linus Torvalds
parent ef35ce231b
commit 610d18f412
2 changed files with 18 additions and 10 deletions
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12
fs/timerfd.c
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@@ -186,10 +186,9 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
BUILD_BUG_ON(TFD_CLOEXEC != O_CLOEXEC);
BUILD_BUG_ON(TFD_NONBLOCK != O_NONBLOCK);
if (flags & ~(TFD_CLOEXEC | TFD_NONBLOCK))
return -EINVAL;
if (clockid != CLOCK_MONOTONIC &&
clockid != CLOCK_REALTIME)
if ((flags & ~TFD_CREATE_FLAGS) ||
(clockid != CLOCK_MONOTONIC &&
clockid != CLOCK_REALTIME))
return -EINVAL;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
@@ -201,7 +200,7 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
hrtimer_init(&ctx->tmr, clockid, HRTIMER_MODE_ABS);
ufd = anon_inode_getfd("[timerfd]", &timerfd_fops, ctx,
flags & (O_CLOEXEC | O_NONBLOCK));
flags & TFD_SHARED_FCNTL_FLAGS);
if (ufd < 0)
kfree(ctx);
@@ -219,7 +218,8 @@ SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
if (copy_from_user(&ktmr, utmr, sizeof(ktmr)))
return -EFAULT;
if (!timespec_valid(&ktmr.it_value) ||
if ((flags & ~TFD_SETTIME_FLAGS) ||
!timespec_valid(&ktmr.it_value) ||
!timespec_valid(&ktmr.it_interval))
return -EINVAL;