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security,overlayfs: Provide security hook for copy up of xattrs for overlay file

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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>
This commit is contained in:
Vivek Goyal
2016-07-13 10:44:49 -04:00
committed by Paul Moore
parent 56909eb3f5
commit 121ab822ef
4 changed files with 31 additions and 0 deletions
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6
include/linux/security.h
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@@ -283,6 +283,7 @@ int security_inode_setsecurity(struct inode *inode, const char *name, const void
int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size);
void security_inode_getsecid(struct inode *inode, u32 *secid);
int security_inode_copy_up(struct dentry *src, struct cred **new);
int security_inode_copy_up_xattr(const char *name);
int security_file_permission(struct file *file, int mask);
int security_file_alloc(struct file *file);
void security_file_free(struct file *file);
@@ -764,6 +765,11 @@ static inline int security_inode_copy_up(struct dentry *src, struct cred **new)
return 0;
}
static inline int security_inode_copy_up_xattr(const char *name)
{
return -EOPNOTSUPP;
}
static inline int security_file_permission(struct file *file, int mask)
{
return 0;