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From: Jann Horn <jannh@google.com>
To: "Mickaël Salaün" <mic@digikod.net>, "Kees Cook" <keescook@chromium.org>
Cc: "James Morris" <jmorris@namei.org>,
	"Serge E . Hallyn" <serge@hallyn.com>,
	"Al Viro" <viro@zeniv.linux.org.uk>,
	"Andy Lutomirski" <luto@amacapital.net>,
	"Anton Ivanov" <anton.ivanov@cambridgegreys.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Casey Schaufler" <casey@schaufler-ca.com>,
	"Jeff Dike" <jdike@addtoit.com>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Michael Kerrisk" <mtk.manpages@gmail.com>,
	"Richard Weinberger" <richard@nod.at>,
	"Shuah Khan" <shuah@kernel.org>,
	"Vincent Dagonneau" <vincent.dagonneau@ssi.gouv.fr>,
	"Kernel Hardening" <kernel-hardening@lists.openwall.com>,
	"Linux API" <linux-api@vger.kernel.org>,
	linux-arch <linux-arch@vger.kernel.org>,
	"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	"kernel list" <linux-kernel@vger.kernel.org>,
	"open list:KERNEL SELFTEST FRAMEWORK"
	<linux-kselftest@vger.kernel.org>,
	linux-security-module <linux-security-module@vger.kernel.org>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	"Mickaël Salaün" <mic@linux.microsoft.com>
Subject: Re: [PATCH v22 08/12] landlock: Add syscall implementations
Date: Fri, 30 Oct 2020 04:07:44 +0100	[thread overview]
Message-ID: <CAG48ez1FQVkt78129WozBwFbVhAPyAr9oJAHFHAbbNxEBr9h1g@mail.gmail.com> (raw)
In-Reply-To: <de287149-ff42-40ca-5bd1-f48969880a06@digikod.net>

On Thu, Oct 29, 2020 at 12:30 PM Mickaël Salaün <mic@digikod.net> wrote:
> On 29/10/2020 02:06, Jann Horn wrote:
> > On Tue, Oct 27, 2020 at 9:04 PM Mickaël Salaün <mic@digikod.net> wrote:
> >> These 3 system calls are designed to be used by unprivileged processes
> >> to sandbox themselves:
[...]
> >> +       /*
> >> +        * Similar checks as for seccomp(2), except that an -EPERM may be
> >> +        * returned.
> >> +        */
> >> +       if (!task_no_new_privs(current)) {
> >> +               err = security_capable(current_cred(), current_user_ns(),
> >> +                               CAP_SYS_ADMIN, CAP_OPT_NOAUDIT);
> >
> > I think this should be ns_capable_noaudit(current_user_ns(), CAP_SYS_ADMIN)?
>
> Right. The main difference is that ns_capable*() set PF_SUPERPRIV in
> current->flags. I guess seccomp should use ns_capable_noaudit() as well?

Yeah. That seccomp code is from commit e2cfabdfd0756, with commit date
in April 2012, while ns_capable_noaudit() was introduced in commit
98f368e9e263, with commit date in June 2016; the seccomp code predates
the availability of that API.

Do you want to send a patch to Kees for that, or should I?

  reply	other threads:[~2020-10-30  3:08 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-27 20:03 [PATCH v22 00/12] Landlock LSM Mickaël Salaün
2020-10-27 20:03 ` [PATCH v22 01/12] landlock: Add object management Mickaël Salaün
2020-10-29  1:05   ` Jann Horn
2020-10-29  9:30     ` Mickaël Salaün
2020-10-30  3:02       ` Jann Horn
2020-11-16 21:26   ` Pavel Machek
2020-11-16 21:36     ` Mickaël Salaün
2020-10-27 20:03 ` [PATCH v22 02/12] landlock: Add ruleset and domain management Mickaël Salaün
2020-10-29  1:05   ` Jann Horn
2020-10-29  9:35     ` Mickaël Salaün
2020-10-27 20:03 ` [PATCH v22 03/12] landlock: Set up the security framework and manage credentials Mickaël Salaün
2020-10-29  1:06   ` Jann Horn
2020-10-27 20:03 ` [PATCH v22 04/12] landlock: Add ptrace restrictions Mickaël Salaün
2020-10-29  1:06   ` Jann Horn
2020-10-27 20:03 ` [PATCH v22 05/12] LSM: Infrastructure management of the superblock Mickaël Salaün
2020-10-28  5:29   ` James Morris
2020-10-27 20:03 ` [PATCH v22 06/12] fs,security: Add sb_delete hook Mickaël Salaün
2020-10-28  5:30   ` James Morris
2020-10-29  1:06   ` Jann Horn
2020-10-27 20:03 ` [PATCH v22 07/12] landlock: Support filesystem access-control Mickaël Salaün
2020-10-29  1:06   ` Jann Horn
2020-10-29 10:47     ` Mickaël Salaün
2020-11-03 16:03     ` Mickaël Salaün
2020-10-27 20:03 ` [PATCH v22 08/12] landlock: Add syscall implementations Mickaël Salaün
2020-10-29  1:06   ` Jann Horn
2020-10-29 11:30     ` Mickaël Salaün
2020-10-30  3:07       ` Jann Horn [this message]
2020-10-30 12:41         ` Mickaël Salaün
2020-10-27 20:03 ` [PATCH v22 09/12] arch: Wire up Landlock syscalls Mickaël Salaün
2020-10-28  5:31   ` James Morris
2020-10-27 20:03 ` [PATCH v22 10/12] selftests/landlock: Add user space tests Mickaël Salaün
2020-10-27 20:03 ` [PATCH v22 11/12] samples/landlock: Add a sandbox manager example Mickaël Salaün
2020-10-27 20:03 ` [PATCH v22 12/12] landlock: Add user and kernel documentation Mickaël Salaün
2020-10-29  1:07   ` Jann Horn
2020-10-29 11:38     ` Mickaël Salaün
2020-10-29  1:05 ` [PATCH v22 00/12] Landlock LSM Jann Horn
2020-10-29 11:40   ` Mickaël Salaün

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