linux-kernel - Re: [PATCH] cgroup: Fix crash with CLONE_INTO

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Message-ID: <Y0MP/errn3nJ+9WQ@kroah.com>
Date:   Sun, 9 Oct 2022 20:16:29 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Christian Brauner <brauner@...nel.org>
Cc:     "Christian A. Ehrhardt" <lk@...e.de>, Tejun Heo <tj@...nel.org>,
        syzbot <syzbot+534ee3d24c37c411f37f@...kaller.appspotmail.com>,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        Yosry Ahmed <yosryahmed@...gle.com>
Subject: Re: [PATCH] cgroup: Fix crash with CLONE_INTO_CGROUP and v1 cgroups

On Sun, Oct 09, 2022 at 07:35:19PM +0200, Christian Brauner wrote:
> On Sun, Oct 09, 2022 at 03:10:36PM +0200, Christian A. Ehrhardt wrote:
> > 
> > Since commit f3a2aebdd6, Version 1 cgroups no longer cause an
> > error when used with CLONE_INTO_CGROUP. However, the permission
> > checks performed during clone assume a Version 2 cgroup.
> > 
> > Restore the error check for V1 cgroups in the clone() path.
> > 
> > Reported-by: syzbot+534ee3d24c37c411f37f@...kaller.appspotmail.com
> > Link: https://lore.kernel.org/lkml/000000000000385cbf05ea3f1862@google.com/
> > Fixes: f3a2aebdd6 ("cgroup: enable cgroup_get_from_file() on cgroup1")
> > Signed-off-by: Christian A. Ehrhardt <lk@...e.de>
> > ---
> 
> Thanks for fixing this,
> Reviewed-by: Christian Brauner (Microsoft) <brauner@...nel.org>

No cc: stable?  :(