linux-kernel - [PATCH] orangefs: off by ones in xattr size checks

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-next>] [day] [month] [year] [list]

Date:   Mon, 22 May 2017 15:08:31 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Mike Marshall <hubcap@...ibond.com>,
        Martin Brandenburg <martin@...ibond.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] orangefs: off by ones in xattr size checks

A previous patch which claimed to remove off by ones actually introduced
them.

strlen() returns the length of the string not including the NUL
character.  We are using strcpy() to copy "name" into a buffer which is
ORANGEFS_MAX_XATTR_NAMELEN characters long.  We should make sure to
leave space for the NUL, otherwise we're writing one character beyond
the end of the buffer.

Fixes: e675c5ec51fe ("orangefs: clean up oversize xattr validation")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/fs/orangefs/xattr.c b/fs/orangefs/xattr.c
index 237c9c04dc3b..a34b25be39c5 100644
--- a/fs/orangefs/xattr.c
+++ b/fs/orangefs/xattr.c
@@ -76,7 +76,7 @@ ssize_t orangefs_inode_getxattr(struct inode *inode, const char *name,
 	if (S_ISLNK(inode->i_mode))
 		return -EOPNOTSUPP;
 
-	if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN)
+	if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
 		return -EINVAL;
 
 	fsuid = from_kuid(&init_user_ns, current_fsuid());
@@ -169,7 +169,7 @@ static int orangefs_inode_removexattr(struct inode *inode, const char *name,
 	struct orangefs_kernel_op_s *new_op = NULL;
 	int ret = -ENOMEM;
 
-	if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN)
+	if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
 		return -EINVAL;
 
 	down_write(&orangefs_inode->xattr_sem);
@@ -233,7 +233,7 @@ int orangefs_inode_setxattr(struct inode *inode, const char *name,
 
 	if (size > ORANGEFS_MAX_XATTR_VALUELEN)
 		return -EINVAL;
-	if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN)
+	if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
 		return -EINVAL;
 
 	internal_flag = convert_to_internal_xattr_flags(flags);