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authorVivek Goyal <vgoyal@redhat.com>2016-07-13 17:44:49 +0300
committerPaul Moore <paul@paul-moore.com>2016-08-09 03:42:13 +0300
commit121ab822ef21914adac2fa3730efeeb8fd762473 (patch)
tree7fd5f6947837b361c249ec976af17bee10b22a2e /security/security.c
parent56909eb3f559103196ecbf2c08c923e0804980fb (diff)
downloadlinux-121ab822ef21914adac2fa3730efeeb8fd762473.tar.xz
security,overlayfs: Provide security hook for copy up of xattrs for overlay file
Provide a security hook which is called when xattrs of a file are being copied up. This hook is called once for each xattr and LSM can return 0 if the security module wants the xattr to be copied up, 1 if the security module wants the xattr to be discarded on the copy, -EOPNOTSUPP if the security module does not handle/manage the xattr, or a -errno upon an error. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> [PM: whitespace cleanup for checkpatch.pl] Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security/security.c')
-rw-r--r--security/security.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c
index f2a7f27bd3e9..a9e2bb9fb9d3 100644
--- a/security/security.c
+++ b/security/security.c
@@ -754,6 +754,12 @@ int security_inode_copy_up(struct dentry *src, struct cred **new)
}
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);
+}
+EXPORT_SYMBOL(security_inode_copy_up_xattr);
+
int security_file_permission(struct file *file, int mask)
{
int ret;
@@ -1692,6 +1698,8 @@ struct security_hook_heads security_hook_heads = {
LIST_HEAD_INIT(security_hook_heads.inode_getsecid),
.inode_copy_up =
LIST_HEAD_INIT(security_hook_heads.inode_copy_up),
+ .inode_copy_up_xattr =
+ LIST_HEAD_INIT(security_hook_heads.inode_copy_up_xattr),
.file_permission =
LIST_HEAD_INIT(security_hook_heads.file_permission),
.file_alloc_security =