[PATCH 4.11 058/114] orangefs: clean up oversize xattr validation

From: Greg Kroah-Hartman
Date: Thu May 18 2017 - 08:04:36 EST


4.11-stable review patch. If anyone has any objections, please let me know.

------------------

From: Martin Brandenburg <martin@xxxxxxxxxxxx>

commit e675c5ec51fe2554719a7b6bcdbef0a770f2c19b upstream.

Also don't check flags as this has been validated by the VFS already.

Fix an off-by-one error in the max size checking.

Stop logging just because userspace wants to write attributes which do
not fit.

This and the previous commit fix xfstests generic/020.

Signed-off-by: Martin Brandenburg <martin@xxxxxxxxxxxx>
Signed-off-by: Mike Marshall <hubcap@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/orangefs/xattr.c | 24 +++++++-----------------
1 file changed, 7 insertions(+), 17 deletions(-)

--- a/fs/orangefs/xattr.c
+++ b/fs/orangefs/xattr.c
@@ -76,11 +76,8 @@ ssize_t orangefs_inode_getxattr(struct i
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;

- if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN) {
- gossip_err("Invalid key length (%d)\n",
- (int)strlen(name));
+ if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN)
return -EINVAL;
- }

fsuid = from_kuid(&init_user_ns, current_fsuid());
fsgid = from_kgid(&init_user_ns, current_fsgid());
@@ -172,6 +169,9 @@ static int orangefs_inode_removexattr(st
struct orangefs_kernel_op_s *new_op = NULL;
int ret = -ENOMEM;

+ if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN)
+ return -EINVAL;
+
down_write(&orangefs_inode->xattr_sem);
new_op = op_alloc(ORANGEFS_VFS_OP_REMOVEXATTR);
if (!new_op)
@@ -231,23 +231,13 @@ int orangefs_inode_setxattr(struct inode
"%s: name %s, buffer_size %zd\n",
__func__, name, size);

- if (size >= ORANGEFS_MAX_XATTR_VALUELEN ||
- flags < 0) {
- gossip_err("orangefs_inode_setxattr: bogus values of size(%d), flags(%d)\n",
- (int)size,
- flags);
+ if (size > ORANGEFS_MAX_XATTR_VALUELEN)
+ return -EINVAL;
+ if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN)
return -EINVAL;
- }

internal_flag = convert_to_internal_xattr_flags(flags);

- if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN) {
- gossip_err
- ("orangefs_inode_setxattr: bogus key size (%d)\n",
- (int)(strlen(name)));
- return -EINVAL;
- }
-
/* This is equivalent to a removexattr */
if (size == 0 && value == NULL) {
gossip_debug(GOSSIP_XATTR_DEBUG,