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From: Jann Horn <jannh@google.com>
To: Christian Brauner <christian.brauner@ubuntu.com>
Cc: "Stéphane Graber" <stgraber@ubuntu.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	"Aleksa Sarai" <cyphar@cyphar.com>,
	"Stephen Barber" <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>,
	"kernel list" <linux-kernel@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	"Linux Containers" <containers@lists.linux-foundation.org>,
	linux-security-module <linux-security-module@vger.kernel.org>,
	"Linux API" <linux-api@vger.kernel.org>
Subject: Re: [PATCH v3 19/25] commoncap: handle fsid mappings with vfs caps
Date: Wed, 19 Feb 2020 16:53:47 +0100	[thread overview]
Message-ID: <CAG48ez2ikuZQTctjR0RAXYUFrSsJdyn98cKGn5hGEhYjzWfO8g@mail.gmail.com> (raw)
In-Reply-To: <20200218143411.2389182-20-christian.brauner@ubuntu.com>

On Tue, Feb 18, 2020 at 3:35 PM Christian Brauner
<christian.brauner@ubuntu.com> wrote:
> Switch vfs cap helpers 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.
[...]
> diff --git a/security/commoncap.c b/security/commoncap.c
[...]
> @@ -328,7 +328,7 @@ static bool rootid_owns_currentns(kuid_t kroot)
>                 return false;
>
>         for (ns = current_user_ns(); ; ns = ns->parent) {
> -               if (from_kuid(ns, kroot) == 0)
> +               if (from_kfsuid(ns, kroot) == 0)
>                         return true;
>                 if (ns == &init_user_ns)
>                         break;

Nit: Maybe change the name of this function to something that makes it
clear that this operates in the fsuid mapping domain.

  reply	other threads:[~2020-02-19 15:54 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-18 14:33 [PATCH v3 00/25] user_namespace: introduce fsid mappings Christian Brauner
2020-02-18 14:33 ` [PATCH v3 01/25] user_namespace: introduce fsid mappings infrastructure Christian Brauner
2020-02-19  2:33   ` Serge E. Hallyn
2020-02-18 14:33 ` [PATCH v3 02/25] proc: add /proc/<pid>/fsuid_map Christian Brauner
2020-02-19  2:33   ` Serge E. Hallyn
2020-02-18 14:33 ` [PATCH v3 03/25] proc: add /proc/<pid>/fsgid_map Christian Brauner
2020-02-19  2:33   ` Serge E. Hallyn
2020-02-18 14:33 ` [PATCH v3 04/25] fsuidgid: add fsid mapping helpers Christian Brauner
2020-02-18 14:33 ` [PATCH v3 05/25] user_namespace: refactor map_write() Christian Brauner
2020-02-19  2:35   ` Serge E. Hallyn
2020-02-18 14:33 ` [PATCH v3 06/25] user_namespace: make map_write() support fsid mappings Christian Brauner
2020-02-19 16:18   ` Jann Horn
2020-02-18 14:33 ` [PATCH v3 07/25] proc: task_state(): use from_kfs{g,u}id_munged Christian Brauner
2020-02-19  2:36   ` Serge E. Hallyn
2020-02-18 14:33 ` [PATCH v3 08/25] cred: add kfs{g,u}id Christian Brauner
2020-02-18 14:33 ` [PATCH v3 09/25] fs: add is_userns_visible() helper Christian Brauner
2020-02-19  2:42   ` Serge E. Hallyn
2020-02-19 12:06     ` Christian Brauner
2020-02-19 17:18       ` Andy Lutomirski
2020-02-20 14:26         ` Serge E. Hallyn
2020-02-18 14:33 ` [PATCH v3 10/25] namei: may_{o_}create(): handle fsid mappings Christian Brauner
2020-02-18 14:33 ` [PATCH v3 11/25] inode: inode_owner_or_capable(): " Christian Brauner
2020-02-18 22:25   ` Christoph Hellwig
2020-02-19 12:29     ` Christian Brauner
2020-02-18 14:33 ` [PATCH v3 12/25] capability: privileged_wrt_inode_uidgid(): " Christian Brauner
2020-02-18 14:33 ` [PATCH v3 13/25] stat: " Christian Brauner
2020-02-18 14:34 ` [PATCH v3 14/25] open: " Christian Brauner
2020-02-18 14:34 ` [PATCH v3 15/25] posix_acl: " Christian Brauner
2020-02-18 22:26   ` Christoph Hellwig
2020-02-19 12:56     ` Christian Brauner
2020-02-18 14:34 ` [PATCH v3 16/25] attr: notify_change(): " Christian Brauner
2020-02-18 14:34 ` [PATCH v3 17/25] commoncap: cap_bprm_set_creds(): " Christian Brauner
2020-02-18 14:34 ` [PATCH v3 18/25] commoncap: cap_task_fix_setuid(): " Christian Brauner
2020-02-18 14:34 ` [PATCH v3 19/25] commoncap: handle fsid mappings with vfs caps Christian Brauner
2020-02-19 15:53   ` Jann Horn [this message]
2020-02-18 14:34 ` [PATCH v3 20/25] exec: bprm_fill_uid(): handle fsid mappings Christian Brauner
2020-02-18 14:34 ` [PATCH v3 21/25] ptrace: adapt ptrace_may_access() to always uses unmapped fsids Christian Brauner
2020-02-18 14:34 ` [PATCH v3 22/25] devpts: handle fsid mappings Christian Brauner
2020-02-18 14:34 ` [PATCH v3 23/25] keys: " Christian Brauner
2020-02-18 14:34 ` [PATCH v3 24/25] sys: handle fsid mappings in set*id() calls Christian Brauner
2020-02-19 15:42   ` Jann Horn
2020-02-18 14:34 ` [PATCH v3 25/25] selftests: add simple fsid mapping selftests Christian Brauner
2020-02-18 23:50 ` [PATCH v3 00/25] user_namespace: introduce fsid mappings James Bottomley
2020-02-19 12:27   ` Christian Brauner
2020-02-19 15:36     ` James Bottomley
2020-02-19 15:33 ` Jann Horn
2020-02-19 19:35 ` Serge E. Hallyn
2020-02-19 21:48   ` Serge E. Hallyn
2020-02-19 21:56     ` Tycho Andersen
2020-02-27 19:33 ` Josef Bacik
2020-03-02 14:34   ` Serge E. Hallyn

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