uselib: add missing MNT_NOEXEC check

We don't allow loading ELF shared library from noexec points so the
same should apply to sys_uselib aswell.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Ulrich Drepper <drepper@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 0b685888ff6f..f20561ff4528 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -134,6 +134,9 @@ asmlinkage long sys_uselib(const char __user * library)
         if (error)
                 goto out;
 
+        error = -EACCES;
+        if (nd.mnt->mnt_flags & MNT_NOEXEC)
+                goto exit;
         error = -EINVAL;
         if (!S_ISREG(nd.dentry->d_inode->i_mode))
                 goto exit;