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author | Yann Droneaud <ydroneaud@opteya.com> | 2013-09-06 11:39:00 +0100 |
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committer | Jonathan Cameron <jic23@kernel.org> | 2013-09-15 17:27:15 +0100 |
commit | a646fbf0fd11256c59ea6233eb243516086dbf15 (patch) | |
tree | 7c9798cc9b18b14c760b3abe734b69d51987691d /drivers/iio/industrialio-event.c | |
parent | bf29fbeaa13d3350ca71df70c705d8b883c45692 (diff) | |
download | linux-a646fbf0fd11256c59ea6233eb243516086dbf15.tar.gz linux-a646fbf0fd11256c59ea6233eb243516086dbf15.tar.bz2 linux-a646fbf0fd11256c59ea6233eb243516086dbf15.zip |
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.c | 2 |
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); |