From: Roberto Sassu roberto.sassu@huawei.com
Reiserfs sets a security xattr at inode creation time in two stages: first, it calls reiserfs_security_init() to obtain the xattr from active LSMs; then, it calls reiserfs_security_write() to actually write that xattr.
Unfortunately, it seems there is a wrong expectation that LSMs provide the full xattr name in the form 'security.<suffix>'. However, LSMs always provided just the suffix, causing reiserfs to not write the xattr at all (if the suffix is shorter than the prefix), or to write an xattr with the wrong name.
Add a temporary buffer in reiserfs_security_write(), and write to it the full xattr name, before passing it to reiserfs_xattr_set_handle().
Since the 'security.' prefix is always prepended, remove the name length check.
Cc: stable@vger.kernel.org # v2.6.x Fixes: 57fe60df6241 ("reiserfs: add atomic addition of selinux attributes during inode creation") Signed-off-by: Roberto Sassu roberto.sassu@huawei.com --- fs/reiserfs/xattr_security.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/reiserfs/xattr_security.c b/fs/reiserfs/xattr_security.c index 6bffdf9a4fd..b0c354ab113 100644 --- a/fs/reiserfs/xattr_security.c +++ b/fs/reiserfs/xattr_security.c @@ -95,11 +95,13 @@ int reiserfs_security_write(struct reiserfs_transaction_handle *th, struct inode *inode, struct reiserfs_security_handle *sec) { + char xattr_name[XATTR_NAME_MAX + 1]; int error; - if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX)) - return -EINVAL;
- error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value, + snprintf(xattr_name, sizeof(xattr_name), "%s%s", XATTR_SECURITY_PREFIX, + sec->name); + + error = reiserfs_xattr_set_handle(th, inode, xattr_name, sec->value, sec->length, XATTR_CREATE); if (error == -ENODATA || error == -EOPNOTSUPP) error = 0;