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Message-Id: <20210316203633.424794-1-mic@digikod.net>
Date: Tue, 16 Mar 2021 21:36:32 +0100
From: Mickaël Salaün <mic@...ikod.net>
To: Al Viro <viro@...iv.linux.org.uk>,
James Morris <jmorris@...ei.org>,
Serge Hallyn <serge@...lyn.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
Andy Lutomirski <luto@...capital.net>,
Casey Schaufler <casey@...aufler-ca.com>,
Christian Brauner <christian.brauner@...ntu.com>,
Christoph Hellwig <hch@....de>,
David Howells <dhowells@...hat.com>,
Dominik Brodowski <linux@...inikbrodowski.net>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
Jann Horn <jannh@...gle.com>,
John Johansen <john.johansen@...onical.com>,
Kees Cook <keescook@...omium.org>,
Kentaro Takeda <takedakn@...data.co.jp>,
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
kernel-hardening@...ts.openwall.com,
linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-security-module@...r.kernel.org
Subject: [PATCH v5 0/1] Unprivileged chroot
Hi,
This new patch fix a race (spotted by Jann Horn) when reading
current->fs->users .
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), which may be
complementary to the use of user namespaces.
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-rc3 . I would really
appreciate constructive reviews.
Previous versions:
v4: https://lore.kernel.org/r/20210316170135.226381-1-mic@digikod.net
v3: https://lore.kernel.org/r/20210311105242.874506-1-mic@digikod.net
v2: https://lore.kernel.org/r/20210310181857.401675-1-mic@digikod.net
v1: https://lore.kernel.org/r/20210310161000.382796-1-mic@digikod.net
Regards,
Mickaël Salaün (1):
fs: Allow no_new_privs tasks to call chroot(2)
fs/open.c | 23 +++++++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)
base-commit: 1e28eed17697bcf343c6743f0028cc3b5dd88bf0
--
2.30.2
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