Yann, On Mon, Jul 08, 2013 at 05:41:33PM -0500, Ben Myers wrote: > On Tue, Jul 02, 2013 at 06:39:34PM +0200, Yann Droneaud wrote: > > 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 <ydrone...@opteya.com> > > > > --- > > fs/xfs/xfs_ioctl.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c > > index 5e99968..dc5b659 100644 > > --- a/fs/xfs/xfs_ioctl.c > > +++ b/fs/xfs/xfs_ioctl.c > > @@ -248,7 +248,7 @@ xfs_open_by_handle( > > goto out_dput; > > } > > > > - fd = get_unused_fd(); > > + fd = get_unused_fd_flags(0); > > O_CLOEXEC should be fine in this case. > > Reviewed-by: Ben Myers <b...@sgi.com>
Applied at git://oss.sgi.com/xfs/xfs.git. Looks like I was wrong about O_CLOEXEC being ok here. There may be applications which open_by_handle then fork/exec and expect to still be able to use that file descriptor. Thanks, Ben -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
