linux-kernel - [PATCH] orangefs: strncpy -> strscpy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <1460136801-32480-1-git-send-email-martin@omnibond.com>
Date:	Fri,  8 Apr 2016 13:33:21 -0400
From:	Martin Brandenburg <martin@...ibond.com>
To:	andy.shevchenko@...il.com, hubcap@...ibond.com,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:	Martin Brandenburg <martin@...ibond.com>
Subject: [PATCH] orangefs: strncpy -> strscpy

It would have been possible for a rogue client-core to send in a symlink
target which is not NUL terminated. This returns EIO if the client-core
gives us corrupt data.

Leave debugfs and superblock code as is for now.

Other dcache.c and namei.c strncpy instances are safe because
ORANGEFS_NAME_MAX = NAME_MAX + 1; there is always enough space for a
name plus a NUL byte.

Signed-off-by: Martin Brandenburg <martin@...ibond.com>
---
 fs/orangefs/orangefs-utils.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/orangefs/orangefs-utils.c b/fs/orangefs/orangefs-utils.c
index 40f5163..f392a6a 100644
--- a/fs/orangefs/orangefs-utils.c
+++ b/fs/orangefs/orangefs-utils.c
@@ -315,9 +315,13 @@ int orangefs_inode_getattr(struct inode *inode, int new, int size)
 			inode->i_size = (loff_t)strlen(new_op->
 			    downcall.resp.getattr.link_target);
 			orangefs_inode->blksize = (1 << inode->i_blkbits);
-			strlcpy(orangefs_inode->link_target,
+			ret = strscpy(orangefs_inode->link_target,
 			    new_op->downcall.resp.getattr.link_target,
 			    ORANGEFS_NAME_MAX);
+			if (ret == -E2BIG) {
+				ret = -EIO;
+				goto out;
+			}
 			inode->i_link = orangefs_inode->link_target;
 		}
 		break;
-- 
1.8.3.1