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From: Jann Horn <jannh@google.com>
To: "Mickaël Salaün" <mic@digikod.net>
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>,
	"Kees Cook" <keescook@chromium.org>,
	"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 04/12] landlock: Add ptrace restrictions
Date: Thu, 29 Oct 2020 02:06:06 +0100	[thread overview]
Message-ID: <CAG48ez1W2sHBeL4pV4QqUonUJc-snNnxE_jh8FVP=pyhhm0fdg@mail.gmail.com> (raw)
In-Reply-To: <20201027200358.557003-5-mic@digikod.net>

On Tue, Oct 27, 2020 at 9:04 PM Mickaël Salaün <mic@digikod.net> wrote:
> Using ptrace(2) and related debug features on a target process can lead
> to a privilege escalation.  Indeed, ptrace(2) can be used by an attacker
> to impersonate another task and to remain undetected while performing
> malicious activities.  Thanks to  ptrace_may_access(), various part of
> the kernel can check if a tracer is more privileged than a tracee.
>
> A landlocked process has fewer privileges than a non-landlocked process
> and must then be subject to additional restrictions when manipulating
> processes. To be allowed to use ptrace(2) and related syscalls on a
> target process, a landlocked process must have a subset of the target
> process's rules (i.e. the tracee must be in a sub-domain of the tracer).
>
> Cc: James Morris <jmorris@namei.org>
> Cc: Jann Horn <jannh@google.com>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Serge E. Hallyn <serge@hallyn.com>
> Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com>

Reviewed-by: Jann Horn <jannh@google.com>

  reply	other threads:[~2020-10-29  1:07 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 [this message]
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
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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