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authorDmitry Kasatkin <d.kasatkin@samsung.com>2014-11-20 16:31:01 +0200
committerMimi Zohar <zohar@linux.vnet.ibm.com>2015-05-21 13:28:47 -0400
commit7c51bb00c40e5608fb2cdac5230f51aeb56a28df (patch)
treeea228d622a60f43812b50ce7e27b2abbb466f04b /fs
parent5101a1850bb7ccbf107929dee9af0cd2f400940f (diff)
downloadop-kernel-dev-7c51bb00c40e5608fb2cdac5230f51aeb56a28df.zip
op-kernel-dev-7c51bb00c40e5608fb2cdac5230f51aeb56a28df.tar.gz
evm: fix potential race when removing xattrs
EVM needs to be atomically updated when removing xattrs. Otherwise concurrent EVM verification may fail in between. This patch fixes by moving i_mutex unlocking after calling EVM hook. fsnotify_xattr() is also now called while locked the same way as it is done in __vfs_setxattr_noperm. Changelog: - remove unused 'inode' variable. Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/xattr.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/xattr.c b/fs/xattr.c
index 4ef6985..072fee1 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -298,18 +298,18 @@ vfs_removexattr(struct dentry *dentry, const char *name)
mutex_lock(&inode->i_mutex);
error = security_inode_removexattr(dentry, name);
- if (error) {
- mutex_unlock(&inode->i_mutex);
- return error;
- }
+ if (error)
+ goto out;
error = inode->i_op->removexattr(dentry, name);
- mutex_unlock(&inode->i_mutex);
if (!error) {
fsnotify_xattr(dentry);
evm_inode_post_removexattr(dentry, name);
}
+
+out:
+ mutex_unlock(&inode->i_mutex);
return error;
}
EXPORT_SYMBOL_GPL(vfs_removexattr);
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