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vfs: Verify acls are valid within superblock's s_user_ns. 

Update posix_acl_valid to verify that an acl is within a user namespace.

Update the callers of posix_acl_valid to pass in an appropriate
user namespace.  For posix_acl_xattr_set and v9fs_xattr_set_acl pass in
inode->i_sb->s_user_ns to posix_acl_valid.  For md_unpack_acl pass in
&init_user_ns as no inode or superblock is in sight.

Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2016-06-27 16:04:06 -05:00
parent 37b11804ed
commit 0d4d717f25
4 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/staging/lustre/lustre/mdc/mdc_request.c
View File

@ -434,7 +434,7 @@ static int mdc_unpack_acl(struct ptlrpc_request *req, struct lustre_md *md)
return rc;
}
rc = posix_acl_valid(acl);
rc = posix_acl_valid(&init_user_ns, acl);
if (rc) {
CERROR("validate acl: %d\n", rc);
posix_acl_release(acl);

2
fs/9p/acl.c
View File

@ -266,7 +266,7 @@ static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
if (IS_ERR(acl))
return PTR_ERR(acl);
else if (acl) {
retval = posix_acl_valid(acl);
retval = posix_acl_valid(inode->i_sb->s_user_ns, acl);
if (retval)
goto err_out;
}

8
fs/posix_acl.c
View File

@ -205,7 +205,7 @@ posix_acl_clone(const struct posix_acl *acl, gfp_t flags)
* Check if an acl is valid. Returns 0 if it is, or -E... otherwise.
*/
int
posix_acl_valid(const struct posix_acl *acl)
posix_acl_valid(struct user_namespace *user_ns, const struct posix_acl *acl)
{
const struct posix_acl_entry *pa, *pe;
int state = ACL_USER_OBJ;
@ -225,7 +225,7 @@ posix_acl_valid(const struct posix_acl *acl)
case ACL_USER:
if (state != ACL_USER)
return -EINVAL;
if (!uid_valid(pa->e_uid))
if (!kuid_has_mapping(user_ns, pa->e_uid))
return -EINVAL;
needs_mask = 1;
break;
@ -240,7 +240,7 @@ posix_acl_valid(const struct posix_acl *acl)
case ACL_GROUP:
if (state != ACL_GROUP)
return -EINVAL;
if (!gid_valid(pa->e_gid))
if (!kgid_has_mapping(user_ns, pa->e_gid))
return -EINVAL;
needs_mask = 1;
break;
@ -845,7 +845,7 @@ posix_acl_xattr_set(const struct xattr_handler *handler,
return PTR_ERR(acl);
if (acl) {
ret = posix_acl_valid(acl);
ret = posix_acl_valid(inode->i_sb->s_user_ns, acl);
if (ret)
goto out;
}

2
include/linux/posix_acl.h
View File

@ -81,7 +81,7 @@ 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(const struct posix_acl *);
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 *);