linux-kernel - [PATCH] kill suid bit only for regular files

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Date:	Sun, 19 Oct 2008 18:00:39 +0400
From:	Dmitri Monakhov <dmonakhov@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org,
	Dmitri Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH] kill suid bit only for regular files

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.

Signed-off-by: Dmitri Monakhov <dmonakhov@...nvz.org>
---
 mm/filemap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index a2907d5..3d5a2e7 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1767,7 +1767,7 @@ int should_remove_suid(struct dentry *dentry)
 	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;
-- 
1.5.4.3

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