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authorChristian Brauner <christian.brauner@ubuntu.com>2021-01-21 16:19:24 +0300
committerChristian Brauner <christian.brauner@ubuntu.com>2021-01-24 16:27:16 +0300
commit47291baa8ddfdae10663624ff0a15ab165952708 (patch)
tree132a9486b82c5eada1c4b375f693522f0a04d629 /include/linux/posix_acl.h
parent0558c1bf5a0811bf5e3753eed911a15b9bd08271 (diff)
downloadlinux-47291baa8ddfdae10663624ff0a15ab165952708.tar.xz
namei: make permission helpers idmapped mount aware
The two helpers inode_permission() and generic_permission() are used by the vfs to perform basic permission checking by verifying that the caller is privileged over an inode. In order to handle idmapped mounts we extend the two helpers with an additional user namespace argument. On idmapped mounts the two helpers will make sure to map the inode according to the mount's user namespace and then peform identical permission checks to inode_permission() and generic_permission(). If the initial user namespace is passed nothing changes so non-idmapped mounts will see identical behavior as before. Link: https://lore.kernel.org/r/20210121131959.646623-6-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: James Morris <jamorris@linux.microsoft.com> Acked-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'include/linux/posix_acl.h')
-rw-r--r--include/linux/posix_acl.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h
index 90797f1b421d..85fb4c0c650a 100644
--- a/include/linux/posix_acl.h
+++ b/include/linux/posix_acl.h
@@ -15,6 +15,8 @@
#include <linux/refcount.h>
#include <uapi/linux/posix_acl.h>
+struct user_namespace;
+
struct posix_acl_entry {
short e_tag;
unsigned short e_perm;
@@ -61,8 +63,6 @@ posix_acl_release(struct posix_acl *acl)
extern void posix_acl_init(struct posix_acl *, int);
extern struct posix_acl *posix_acl_alloc(int, gfp_t);
-extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
-extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
@@ -85,6 +85,9 @@ struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
void forget_cached_acl(struct inode *inode, int type);
void forget_all_cached_acls(struct inode *inode);
+int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
+int posix_acl_permission(struct user_namespace *, struct inode *,
+ const struct posix_acl *, int);
static inline void cache_no_acl(struct inode *inode)
{