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authorJie Liu <jeff.liu@oracle.com>2014-01-02 21:30:42 +0400
committerDave Kleikamp <dave.kleikamp@oracle.com>2014-01-02 21:36:56 +0400
commit0439e091e3b1fe41a350540c84857a573fde3d72 (patch)
tree56a720ab70a9ad00c6cb405915bda26f2665d7ba /fs/jfs
parent9a0bb2966efbf30a71c128c3af63307d8b5f5fc0 (diff)
downloadlinux-0439e091e3b1fe41a350540c84857a573fde3d72.tar.xz
jfs: fix xattr value size overflow in __jfs_setxattr
There is a potential overflow if the specified EA value size is greater than USHRT_MAX because the size of value is limited by the on-disk format (i.e, __le16), this issue could be reflected via the tests below: # touch /jfs/testfile # setfattr -n user.comment -v `perl -e 'print "A"x65536'` /jfs/testfile setfattr: /jfs/testfile: Invalid argument Syslog: ... jfs_xsetattr: xattr_size = 21, new_size = 65557 This patch add pre-checkups of EA value size against USHRT_MAX to avoid this problem, and return -E2BIG which is consistent with the VFS setxattr interface. Moreover, fix the debug code to print the correct function name. With this fix: setfattr: /jfs/testfile: Argument list too long Signed-off-by: Jie Liu <jeff.liu@oracle.com> Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Diffstat (limited to 'fs/jfs')
-rw-r--r--fs/jfs/xattr.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index d3472f4cd530..9c6904eee0c6 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -860,6 +860,19 @@ int __jfs_setxattr(tid_t tid, struct inode *inode, const char *name,
/* Completely new ea list */
xattr_size = sizeof (struct jfs_ea_list);
+ /*
+ * The size of EA value is limitted by on-disk format up to
+ * __le16, there would be an overflow if the size is equal
+ * to XATTR_SIZE_MAX (65536). In order to avoid this issue,
+ * we can pre-checkup the value size against USHRT_MAX, and
+ * return -E2BIG in this case, which is consistent with the
+ * VFS setxattr interface.
+ */
+ if (value_len >= USHRT_MAX) {
+ rc = -E2BIG;
+ goto release;
+ }
+
ea = (struct jfs_ea *) ((char *) ealist + xattr_size);
ea->flag = 0;
ea->namelen = namelen;
@@ -874,7 +887,7 @@ int __jfs_setxattr(tid_t tid, struct inode *inode, const char *name,
/* DEBUG - If we did this right, these number match */
if (xattr_size != new_size) {
printk(KERN_ERR
- "jfs_xsetattr: xattr_size = %d, new_size = %d\n",
+ "__jfs_setxattr: xattr_size = %d, new_size = %d\n",
xattr_size, new_size);
rc = -EINVAL;