linux-kernel - [PATCH v2 03/10] android/sw_sync: use get_unused_fd_flags(O_CLOEXEC) instead of get_unused

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Date:	Thu, 15 Aug 2013 15:10:53 +0200
From:	Yann Droneaud <ydroneaud@...eya.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	John Stultz <john.stultz@...aro.org>,
	Erik Gilling <konkers@...roid.com>
Cc:	Yann Droneaud <ydroneaud@...eya.com>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, Colin Cross <ccross@...gle.com>
Subject: [PATCH v2 03/10] android/sw_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@...eya.com>
Cc: Erik Gilling <konkers@...roid.com>
Cc: Colin Cross <ccross@...gle.com>
Link: http://lkml.kernel.org/r/CACSP8SjZcpcpEtQHzcGYhf-MP7QGo0XpN7-uN7rmD=vNtopG=w@mail.gmail.com
Link: http://lkml.kernel.org/r/cover.1376327678.git.ydroneaud@opteya.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..f24493a 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(O_CLOEXEC);
 	int err;
 	struct sync_pt *pt;
 	struct sync_fence *fence;
-- 
1.8.3.1

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