The change in 1e2f82d1e9d1 to error on a NULL pathname to statx() is inconsistent. It results in the error EINVAL for a NULL pathname. Consistent with similar APIs (fchownat(), fstatat(), linkat()), the error should be EFAULT.
The solution is simply to remove the EINVAL check. As I already pointed out in https://lkml.org/lkml/2017/4/26/561, user_path_at*() and filename_lookup() will handle the NULL pathname as per the other APIs, to correctly produce the error EFAULT. Signed-off-by: Michael Kerrisk <[email protected]> --- fs/stat.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/stat.c b/fs/stat.c index 3d85747..a257b87 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -567,8 +567,6 @@ SYSCALL_DEFINE5(statx, return -EINVAL; if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE) return -EINVAL; - if (!filename) - return -EINVAL; error = vfs_statx(dfd, filename, flags, &stat, mask); if (error) -- 2.5.5 -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/
