linux-kernel - [PATCH, v5] sysv: ensure fast symlinks are NUL-terminated

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Message-Id: <1229719638-6982-9-git-send-email-duaneg@dghda.com>
Date:	Fri, 19 Dec 2008 20:47:16 +0000
From:	"Duane Griffin" <duaneg@...da.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Duane Griffin <duaneg@...da.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: [PATCH, v5] sysv: ensure fast symlinks are NUL-terminated

Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.

Cc: Christoph Hellwig <hch@...radead.org>
Cc: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Duane Griffin <duaneg@...da.com>
---

Changes from v4: fixed off-by-one bug in maximum length, as pointed out by
Andreas Dilger.

 fs/sysv/inode.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c
index df0d435..3d81bf5 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -27,6 +27,7 @@
 #include <linux/init.h>
 #include <linux/buffer_head.h>
 #include <linux/vfs.h>
+#include <linux/namei.h>
 #include <asm/byteorder.h>
 #include "sysv.h"
 
@@ -163,8 +164,11 @@ void sysv_set_inode(struct inode *inode, dev_t rdev)
 		if (inode->i_blocks) {
 			inode->i_op = &sysv_symlink_inode_operations;
 			inode->i_mapping->a_ops = &sysv_aops;
-		} else
+		} else {
 			inode->i_op = &sysv_fast_symlink_inode_operations;
+			nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
+				sizeof(SYSV_I(inode)->i_data) - 1);
+		}
 	} else
 		init_special_inode(inode, inode->i_mode, rdev);
 }
-- 
1.6.0.4

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