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authorKP Singh <kpsingh@google.com>2020-06-22 00:21:35 +0200
committerJames Morris <jmorris@namei.org>2020-06-23 16:39:23 -0700
commit23e390cdbe6f85827a43d38f9288dcd3066fa376 (patch)
treea08d76e08595224eee8ae4e44bfd238200ee3002 /security
parent4bc799dcb67066e0531004d5bdbe755bb02b5488 (diff)
downloadlinux-23e390cdbe6f85827a43d38f9288dcd3066fa376.tar.bz2
security: Fix hook iteration and default value for inode_copy_up_xattr
inode_copy_up_xattr returns 0 to indicate the acceptance of the xattr and 1 to reject it. If the LSM does not know about the xattr, it's expected to return -EOPNOTSUPP, which is the correct default value for this hook. BPF LSM, currently, uses 0 as the default value and thereby falsely allows all overlay fs xattributes to be copied up. The iteration logic is also updated from the "bail-on-fail" call_int_hook to continue on the non-decisive -EOPNOTSUPP and bail out on other values. Fixes: 98e828a0650f ("security: Refactor declaration of LSM hooks") Signed-off-by: KP Singh <kpsingh@google.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/security.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/security/security.c b/security/security.c
index 0ce3e73edd42..70a7ad357bc6 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1414,7 +1414,22 @@ EXPORT_SYMBOL(security_inode_copy_up);
int security_inode_copy_up_xattr(const char *name)
{
- return call_int_hook(inode_copy_up_xattr, -EOPNOTSUPP, name);
+ struct security_hook_list *hp;
+ int rc;
+
+ /*
+ * The implementation can return 0 (accept the xattr), 1 (discard the
+ * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
+ * any other error code incase of an error.
+ */
+ hlist_for_each_entry(hp,
+ &security_hook_heads.inode_copy_up_xattr, list) {
+ rc = hp->hook.inode_copy_up_xattr(name);
+ if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr))
+ return rc;
+ }
+
+ return LSM_RET_DEFAULT(inode_copy_up_xattr);
}
EXPORT_SYMBOL(security_inode_copy_up_xattr);