linux-kernel - [PATCH] vfio: Add O_CLOEXEC flag to vfio device fd

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Date:	Thu, 22 Aug 2013 11:19:10 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	alex.williamson@...hat.com
Cc:	aik@...abs.ru, benh@...nel.crashing.org, ydroneaud@...eya.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH] vfio: Add O_CLOEXEC flag to vfio device fd

Add the default O_CLOEXEC flag for device file descriptors.  This is
generally considered a safer option as it allows the user a race free
option to decide whether file descriptors are inherited across exec,
with the default avoiding file descriptor leaks.

Reported-by: Yann Droneaud <ydroneaud@...eya.com>
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---
 drivers/vfio/vfio.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 75c16cc..1eab4ac 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1109,7 +1109,7 @@ static int vfio_group_get_device_fd(struct vfio_group *group, char *buf)
 		 * We can't use anon_inode_getfd() because we need to modify
 		 * the f_mode flags directly to allow more than just ioctls
 		 */
-		ret = get_unused_fd_flags(0);
+		ret = get_unused_fd_flags(O_CLOEXEC);
 		if (ret < 0) {
 			device->ops->release(device->device_data);
 			break;

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