From: Christian Brauner <christian.brauner@ubuntu.com>
To: "Stéphane Graber" <stgraber@ubuntu.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"Aleksa Sarai" <cyphar@cyphar.com>,
"Jann Horn" <jannh@google.com>
Cc: smbarber@chromium.org, Seth Forshee <seth.forshee@canonical.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Alexey Dobriyan <adobriyan@gmail.com>,
Serge Hallyn <serge@hallyn.com>, James Morris <jmorris@namei.org>,
Kees Cook <keescook@chromium.org>,
Jonathan Corbet <corbet@lwn.net>, Phil Estes <estesp@gmail.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
containers@lists.linux-foundation.org,
linux-security-module@vger.kernel.org, linux-api@vger.kernel.org,
Christian Brauner <christian.brauner@ubuntu.com>
Subject: [PATCH v2 21/28] posix_acl: handle fsid mappings
Date: Fri, 14 Feb 2020 19:35:47 +0100 [thread overview]
Message-ID: <20200214183554.1133805-22-christian.brauner@ubuntu.com> (raw)
In-Reply-To: <20200214183554.1133805-1-christian.brauner@ubuntu.com>
Switch posix_acls() to lookup fsids in the fsid mappings. If no fsid
mappings are setup the behavior is unchanged, i.e. fsids are looked up in the
id mappings.
Afaict, all filesystems that share a superblock in all user namespaces
currently do not support acls so this change should be safe to do
unconditionally.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
fs/posix_acl.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 249672bf54fe..763bba24f380 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -22,6 +22,7 @@
#include <linux/xattr.h>
#include <linux/export.h>
#include <linux/user_namespace.h>
+#include <linux/fsuidgid.h>
static struct posix_acl **acl_by_type(struct inode *inode, int type)
{
@@ -692,12 +693,12 @@ static void posix_acl_fix_xattr_userns(
for (end = entry + count; entry != end; entry++) {
switch(le16_to_cpu(entry->e_tag)) {
case ACL_USER:
- uid = make_kuid(from, le32_to_cpu(entry->e_id));
- entry->e_id = cpu_to_le32(from_kuid(to, uid));
+ uid = make_kfsuid(from, le32_to_cpu(entry->e_id));
+ entry->e_id = cpu_to_le32(from_kfsuid(to, uid));
break;
case ACL_GROUP:
- gid = make_kgid(from, le32_to_cpu(entry->e_id));
- entry->e_id = cpu_to_le32(from_kgid(to, gid));
+ gid = make_kfsgid(from, le32_to_cpu(entry->e_id));
+ entry->e_id = cpu_to_le32(from_kfsgid(to, gid));
break;
default:
break;
@@ -746,12 +747,12 @@ posix_acl_from_xattr(struct user_namespace *user_ns,
return ERR_PTR(-EINVAL);
if (count == 0)
return NULL;
-
+
acl = posix_acl_alloc(count, GFP_NOFS);
if (!acl)
return ERR_PTR(-ENOMEM);
acl_e = acl->a_entries;
-
+
for (end = entry + count; entry != end; acl_e++, entry++) {
acl_e->e_tag = le16_to_cpu(entry->e_tag);
acl_e->e_perm = le16_to_cpu(entry->e_perm);
@@ -765,14 +766,14 @@ posix_acl_from_xattr(struct user_namespace *user_ns,
case ACL_USER:
acl_e->e_uid =
- make_kuid(user_ns,
+ make_kfsuid(user_ns,
le32_to_cpu(entry->e_id));
if (!uid_valid(acl_e->e_uid))
goto fail;
break;
case ACL_GROUP:
acl_e->e_gid =
- make_kgid(user_ns,
+ make_kfsgid(user_ns,
le32_to_cpu(entry->e_id));
if (!gid_valid(acl_e->e_gid))
goto fail;
@@ -817,11 +818,11 @@ posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl,
switch(acl_e->e_tag) {
case ACL_USER:
ext_entry->e_id =
- cpu_to_le32(from_kuid(user_ns, acl_e->e_uid));
+ cpu_to_le32(from_kfsuid(user_ns, acl_e->e_uid));
break;
case ACL_GROUP:
ext_entry->e_id =
- cpu_to_le32(from_kgid(user_ns, acl_e->e_gid));
+ cpu_to_le32(from_kfsgid(user_ns, acl_e->e_gid));
break;
default:
ext_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
--
2.25.0
next prev parent reply other threads:[~2020-02-14 18:41 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-14 18:35 [PATCH v2 00/28] user_namespace: introduce fsid mappings Christian Brauner
2020-02-14 18:35 ` [PATCH v2 01/28] user_namespace: introduce fsid mappings infrastructure Christian Brauner
2020-02-14 18:35 ` [PATCH v2 02/28] proc: add /proc/<pid>/fsuid_map Christian Brauner
2020-02-14 18:35 ` [PATCH v2 03/28] proc: add /proc/<pid>/fsgid_map Christian Brauner
2020-02-14 18:35 ` [PATCH v2 04/28] fsuidgid: add fsid mapping helpers Christian Brauner
2020-02-14 19:11 ` Jann Horn
2020-02-16 16:55 ` Christian Brauner
2020-02-14 18:35 ` [PATCH v2 05/28] proc: task_state(): use from_kfs{g,u}id_munged Christian Brauner
2020-02-14 18:35 ` [PATCH v2 06/28] cred: add kfs{g,u}id Christian Brauner
2020-02-14 18:35 ` [PATCH v2 07/28] sys: __sys_setfsuid(): handle fsid mappings Christian Brauner
2020-02-14 18:35 ` [PATCH v2 08/28] sys: __sys_setfsgid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 09/28] sys:__sys_setuid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 10/28] sys:__sys_setgid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 11/28] sys:__sys_setreuid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 12/28] sys:__sys_setregid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 13/28] sys:__sys_setresuid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 14/28] sys:__sys_setresgid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 15/28] fs: add is_userns_visible() helper Christian Brauner
2020-02-14 18:35 ` [PATCH v2 16/28] namei: may_{o_}create(): handle fsid mappings Christian Brauner
2020-02-14 18:35 ` [PATCH v2 17/28] inode: inode_owner_or_capable(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 18/28] capability: privileged_wrt_inode_uidgid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 19/28] stat: " Christian Brauner
2020-02-14 19:03 ` Tycho Andersen
2020-02-16 14:12 ` Christian Brauner
2020-02-14 18:35 ` [PATCH v2 20/28] open: " Christian Brauner
2020-02-14 18:35 ` Christian Brauner [this message]
2020-02-14 18:35 ` [PATCH v2 22/28] attr: notify_change(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 23/28] commoncap: cap_bprm_set_creds(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 24/28] commoncap: cap_task_fix_setuid(): " Christian Brauner
2020-02-14 18:35 ` [PATCH v2 25/28] commoncap: handle fsid mappings with vfs caps Christian Brauner
2020-02-14 18:35 ` [PATCH v2 26/28] exec: bprm_fill_uid(): handle fsid mappings Christian Brauner
2020-02-14 18:35 ` [PATCH v2 27/28] ptrace: adapt ptrace_may_access() to always uses unmapped fsids Christian Brauner
2020-02-14 18:35 ` [PATCH v2 28/28] devpts: handle fsid mappings Christian Brauner
2020-02-16 15:55 ` [PATCH v2 00/28] user_namespace: introduce " Florian Weimer
2020-02-16 16:40 ` Christian Brauner
2020-02-17 21:06 ` James Bottomley
2020-02-17 21:20 ` Christian Brauner
2020-02-17 22:35 ` James Bottomley
2020-02-17 23:05 ` Christian Brauner
2020-02-17 21:11 ` James Bottomley
[not found] ` <CA+enf=vwd-dxzve87t7Mw1Z35RZqdLzVaKq=fZ4EGOpnES0f5w@mail.gmail.com>
2020-02-17 22:02 ` Stéphane Graber
2020-02-17 23:03 ` James Bottomley
2020-02-17 23:11 ` Stéphane Graber
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