linux-kernel - Re: [PATCH] clone3: fix cgroup argument sanity check

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Message-ID: <20200412211053.fs54wfguvttav7j6@wittgenstein>
Date:   Sun, 12 Apr 2020 23:10:53 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Eugene Syromiatnikov <esyr@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Christian Brauner <christian@...uner.io>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>, Tejun Heo <tj@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Li Zefan <lizefan@...wei.com>,
        Peter Zijlstra <peterz@...radead.org>, cgroups@...r.kernel.org,
        "Dmitry V. Levin" <ldv@...linux.org>
Subject: Re: [PATCH] clone3: fix cgroup argument sanity check

On Sun, Apr 12, 2020 at 10:25:33PM +0200, Eugene Syromiatnikov wrote:
> Checking that cgroup field value of struct clone_args is less than 0
> is useless, as it is defined as unsigned 64-bit integer.  Moreover,
> it doesn't catch the situations where its higher bits are lost during
> the assignment to the cgroup field of the cgroup field of the internal
> struct kernel_clone_args (where it is declared as signed 32-bit
> integer), so it is still possible to pass garbage there.  A check
> against INT_MAX solves both these issues.
> 
> Fixes: ef2c41cf38a7559b ("clone3: allow spawning processes into cgroups")
> Signed-off-by: Eugene Syromiatnikov <esyr@...hat.com>

Thanks, will queue for rc2 unless I hear objections.
Acked-by: Christian Brauner <christian.brauner@...ntu.com>