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| author | Eric W. Biederman <ebiederm@xmission.com> | 2016-06-27 16:04:06 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2016-06-30 18:04:58 -0500 |
| commit | 0d4d717f25834134bb6f43284f84c8ccee5bbf2a (patch) | |
| tree | aa4f4605f45bca718b01483e90835731227ef341 /fs/posix_acl.c | |
| parent | 37b11804ed1725dc2ea97be2236150210a69e9d5 (diff) | |
| download | lwn-0d4d717f25834134bb6f43284f84c8ccee5bbf2a.tar.gz lwn-0d4d717f25834134bb6f43284f84c8ccee5bbf2a.zip | |
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>
Diffstat (limited to 'fs/posix_acl.c')
| -rw-r--r-- | fs/posix_acl.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/posix_acl.c b/fs/posix_acl.c index 8a4a266beff3..647c28180675 100644 --- a/fs/posix_acl.c +++ b/fs/posix_acl.c @@ -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; } |