android/sync: use get_unused_fd_flags(O_CLOEXEC) instead of get_unused_fd()

Macro get_unused_fd() is used to allocate a file descriptor with
default flags. Those default flags (0) can be "unsafe":
O_CLOEXEC must be used by default to not leak file descriptor
across exec().

Instead of macro get_unused_fd(), functions anon_inode_getfd()
or get_unused_fd_flags() should be used with flags given by userspace.
If not possible, flags should be set to O_CLOEXEC to provide userspace
with a default safe behavor.

In a further patch, get_unused_fd() will be removed so that
new code start using anon_inode_getfd() or get_unused_fd_flags()
with correct flags.

This patch replaces calls to get_unused_fd() with call to
get_unused_fd_flags(O_CLOEXEC) following advice from Erik Gilling.

Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Cc: Erik Gilling <konkers@android.com>
Cc: Colin Cross <ccross@google.com>
Link: http://lkml.kernel.org/r/CACSP8SjXGMk2_kX_+RgzqqQwqKernvF1Wt3K5tw991W5dfAnCA@mail.gmail.com
Link: http://lkml.kernel.org/r/cover.1376327678.git.ydroneaud@opteya.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
index 2996077fedef1673d67725b802b749af80d025b8..38e5d3b5ed9b605d7d8c5c6f017bb7d0cffa3ab8 100644 (file)
--- a/drivers/staging/android/sync.c
+++ b/drivers/staging/android/sync.c
@@ -697,7 +697,7 @@ static long sync_fence_ioctl_wait(struct sync_fence *fence, unsigned long arg)
 
 static long sync_fence_ioctl_merge(struct sync_fence *fence, unsigned long arg)
 {
-       int fd = get_unused_fd();
+       int fd = get_unused_fd_flags(O_CLOEXEC);
        int err;
        struct sync_fence *fence2, *fence3;
        struct sync_merge_data data;