[patch 06/11] kill suid bit only for regular files

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From: Dmitri Monakhov <dmonakhov@xxxxxxxxxx>

We don't have to do it because it is useless for non regular files.
In fact block device may trigger this path without dentry->d_inode->i_mutex.

(akpm: concerns were expressed (by me) about S_ISDIR inodes)

Signed-off-by: Dmitri Monakhov <dmonakhov@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/filemap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/filemap.c~kill-suid-bit-only-for-regular-files mm/filemap.c
--- a/mm/filemap.c~kill-suid-bit-only-for-regular-files
+++ a/mm/filemap.c
@@ -1766,7 +1766,7 @@ int should_remove_suid(struct dentry *de
 	if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
 		kill |= ATTR_KILL_SGID;
 
-	if (unlikely(kill && !capable(CAP_FSETID)))
+	if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode)))
 		return kill;
 
 	return 0;
_
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