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-rw-r--r--fs/namei.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 89a612e392eb..8b61d103a8a7 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3671,11 +3671,15 @@ SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,
3671 if ((flags & ~(AT_SYMLINK_FOLLOW | AT_EMPTY_PATH)) != 0) 3671 if ((flags & ~(AT_SYMLINK_FOLLOW | AT_EMPTY_PATH)) != 0)
3672 return -EINVAL; 3672 return -EINVAL;
3673 /* 3673 /*
3674 * Using empty names is equivalent to using AT_SYMLINK_FOLLOW 3674 * To use null names we require CAP_DAC_READ_SEARCH
3675 * on /proc/self/fd/<fd>. 3675 * This ensures that not everyone will be able to create
3676 * handlink using the passed filedescriptor.
3676 */ 3677 */
3677 if (flags & AT_EMPTY_PATH) 3678 if (flags & AT_EMPTY_PATH) {
3679 if (!capable(CAP_DAC_READ_SEARCH))
3680 return -ENOENT;
3678 how = LOOKUP_EMPTY; 3681 how = LOOKUP_EMPTY;
3682 }
3679 3683
3680 if (flags & AT_SYMLINK_FOLLOW) 3684 if (flags & AT_SYMLINK_FOLLOW)
3681 how |= LOOKUP_FOLLOW; 3685 how |= LOOKUP_FOLLOW;