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From: "Mickaël Salaün" <mic@digikod.net>
To: Al Viro <viro@zeniv.linux.org.uk>,
	James Morris <jmorris@namei.org>, Serge Hallyn <serge@hallyn.com>
Cc: "Mickaël Salaün" <mic@digikod.net>,
	"Andy Lutomirski" <luto@amacapital.net>,
	"Christian Brauner" <christian.brauner@ubuntu.com>,
	"Christoph Hellwig" <hch@lst.de>,
	"David Howells" <dhowells@redhat.com>,
	"Dominik Brodowski" <linux@dominikbrodowski.net>,
	"Eric Biederman" <ebiederm@xmission.com>,
	"John Johansen" <john.johansen@canonical.com>,
	"Kees Cook" <keescook@chromium.org>,
	"Kentaro Takeda" <takedakn@nttdata.co.jp>,
	"Tetsuo Handa" <penguin-kernel@i-love.sakura.ne.jp>,
	kernel-hardening@lists.openwall.com,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org
Subject: [PATCH v1 0/1] Unprivileged chroot
Date: Wed, 10 Mar 2021 17:09:59 +0100	[thread overview]
Message-ID: <20210310161000.382796-1-mic@digikod.net> (raw)

Hi,

The chroot system call is currently limited to be used by processes with
the CAP_SYS_CHROOT capability.  This protects against malicious
procesess willing to trick SUID-like binaries.  The following patch
allows unprivileged users to safely use chroot(2).

This patch is a follow-up of a previous one sent by Andy Lutomirski some
time ago:
https://lore.kernel.org/lkml/0e2f0f54e19bff53a3739ecfddb4ffa9a6dbde4d.1327858005.git.luto@amacapital.net/

This patch can be applied on top of v5.12-rc2 .  I would really
appreciate constructive reviews.

Regards,

Mickaël Salaün (1):
  fs: Allow no_new_privs tasks to call chroot(2)

 fs/open.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 61 insertions(+), 3 deletions(-)


base-commit: a38fd8748464831584a19438cbb3082b5a2dab15
-- 
2.30.2


             reply	other threads:[~2021-03-10 16:11 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-10 16:09 Mickaël Salaün [this message]
2021-03-10 16:10 ` [PATCH v1 1/1] fs: Allow no_new_privs tasks to call chroot(2) Mickaël Salaün
2021-03-10 16:56   ` Eric W. Biederman
2021-03-10 18:13     ` Mickaël Salaün
2021-03-10 17:22 ` [PATCH v1 0/1] Unprivileged chroot Casey Schaufler
2021-03-10 18:17   ` Mickaël Salaün
2021-03-10 20:59     ` Casey Schaufler
2021-03-11 10:42       ` Mickaël Salaün

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