linux-kernel - [PATCH 04/13] android/sw_sync: use get_unused_fd_flags(0) instead of get_unused

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Message-Id: <73593d09ced9d2d64bebe0fb71e74ac00d8738c6.1372777600.git.ydroneaud@opteya.com>
Date:	Tue,  2 Jul 2013 18:39:28 +0200
From:	Yann Droneaud <ydroneaud@...eya.com>
To:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Cc:	Yann Droneaud <ydroneaud@...eya.com>
Subject: [PATCH 04/13] android/sw_sync: use get_unused_fd_flags(0) 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 equivalent call to
get_unused_fd_flags(0) to preserve current behavor for existing code.

The hard coded flag value (0) should be reviewed on a per-subsystem basis,
and, if possible, set to O_CLOEXEC.

Signed-off-by: Yann Droneaud <ydroneaud@...eya.com>
---
 drivers/staging/android/sw_sync.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/android/sw_sync.c b/drivers/staging/android/sw_sync.c
index 765c757..a4ed0b9 100644
--- a/drivers/staging/android/sw_sync.c
+++ b/drivers/staging/android/sw_sync.c
@@ -163,7 +163,7 @@ static int sw_sync_release(struct inode *inode, struct file *file)
 static long sw_sync_ioctl_create_fence(struct sw_sync_timeline *obj,
 				       unsigned long arg)
 {
-	int fd = get_unused_fd();
+	int fd = get_unused_fd_flags(0);
 	int err;
 	struct sync_pt *pt;
 	struct sync_fence *fence;
-- 
1.8.3.1

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