timerfd: add flags check

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>

2 files changed, 18 insertions, 10 deletions

diff --git a/fs/timerfd.c b/fs/timerfd.c
index 6a123b8ff3f5..b042bd7034b1 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -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;
 
diff --git a/include/linux/timerfd.h b/include/linux/timerfd.h
index 86cb0501d3e2..2d0792983f8c 100644
--- a/include/linux/timerfd.h
+++ b/include/linux/timerfd.h
@@ -11,13 +11,21 @@
 /* For O_CLOEXEC and O_NONBLOCK */
 #include <linux/fcntl.h>
 
-/* Flags for timerfd_settime.  */
+/*
+ * CAREFUL: Check include/asm-generic/fcntl.h when defining
+ * new flags, since they might collide with O_* ones. We want
+ * to re-use O_* flags that couldn't possibly have a meaning
+ * from eventfd, in order to leave a free define-space for
+ * shared O_* flags.
+ */
 #define TFD_TIMER_ABSTIME (1 << 0)
-
-/* Flags for timerfd_create.  */
 #define TFD_CLOEXEC O_CLOEXEC
 #define TFD_NONBLOCK O_NONBLOCK
 
+#define TFD_SHARED_FCNTL_FLAGS (TFD_CLOEXEC | TFD_NONBLOCK)
+/* Flags for timerfd_create.  */
+#define TFD_CREATE_FLAGS TFD_SHARED_FCNTL_FLAGS
+/* Flags for timerfd_settime.  */
+#define TFD_SETTIME_FLAGS TFD_TIMER_ABSTIME
 
 #endif /* _LINUX_TIMERFD_H */
-