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authorYann Droneaud <ydroneaud@opteya.com>2013-09-06 14:39:00 +0400
committerJonathan Cameron <jic23@kernel.org>2013-09-15 20:27:15 +0400
commita646fbf0fd11256c59ea6233eb243516086dbf15 (patch)
tree7c9798cc9b18b14c760b3abe734b69d51987691d /drivers/iio/industrialio-event.c
parentbf29fbeaa13d3350ca71df70c705d8b883c45692 (diff)
downloadlinux-a646fbf0fd11256c59ea6233eb243516086dbf15.tar.xz
iio: use anon_inode_getfd() with O_CLOEXEC flag
IIO uses anon_inode_get() to allocate file descriptors as part of its ioctls. But those ioctls are lacking a flag argument allowing userspace to choose options for the newly opened file descriptor. In such case it's advised to use O_CLOEXEC by default so that userspace is allowed to choose, without race, if the file descriptor is going to be inherited across exec(). KVM usage of anon_inode_getfd() was fixed in a previous patchset [1], so IIO is the only subsystem using anon_inode_getfd() with a fixed set of flags not including O_CLOEXEC. This patch set O_CLOEXEC flag on the event file descriptor created with anon_inode_getfd() to not leak file descriptors across exec(). Links: - Secure File Descriptor Handling (Ulrich Drepper, 2008) http://udrepper.livejournal.com/20407.html - Excuse me son, but your code is leaking !!! (Dan Walsh, March 2012) http://danwalsh.livejournal.com/53603.html - [1] kvm: use anon_inode_getfd() with O_CLOEXEC flag http://lkml.kernel.org/r/cover.1377372576.git.ydroneaud@opteya.com Signed-off-by: Yann Droneaud <ydroneaud@opteya.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/industrialio-event.c')
-rw-r--r--drivers/iio/industrialio-event.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
index 10aa9ef86cec..2390e3d08e48 100644
--- a/drivers/iio/industrialio-event.c
+++ b/drivers/iio/industrialio-event.c
@@ -159,7 +159,7 @@ int iio_event_getfd(struct iio_dev *indio_dev)
}
spin_unlock_irq(&ev_int->wait.lock);
fd = anon_inode_getfd("iio:event",
- &iio_event_chrdev_fileops, ev_int, O_RDONLY);
+ &iio_event_chrdev_fileops, ev_int, O_RDONLY | O_CLOEXEC);
if (fd < 0) {
spin_lock_irq(&ev_int->wait.lock);
__clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);