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evm: fix potential race when removing xattrs

Browse source 
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 <[email protected]>
Signed-off-by: Mimi Zohar <[email protected]>
This commit is contained in:
Dmitry Kasatkin 2014-11-20 16:31:01 +02:00 • committed by Mimi Zohar
commit 7c51bb00c4
2 changed files with 8 additions and 9 deletions
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10
fs/xattr.c
View file

@ -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);