From: Christian Brauner <christian.brauner@ubuntu.com>
To: Eugene Syromiatnikov <esyr@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Christian Brauner <christian@brauner.io>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>, Tejun Heo <tj@kernel.org>,
Oleg Nesterov <oleg@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Li Zefan <lizefan@huawei.com>,
Peter Zijlstra <peterz@infradead.org>,
cgroups@vger.kernel.org, "Dmitry V. Levin" <ldv@altlinux.org>
Subject: Re: [PATCH] clone3: fix cgroup argument sanity check
Date: Sun, 12 Apr 2020 23:10:53 +0200 [thread overview]
Message-ID: <20200412211053.fs54wfguvttav7j6@wittgenstein> (raw)
In-Reply-To: <20200412202533.GA29554@asgard.redhat.com>
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@redhat.com>
Thanks, will queue for rc2 unless I hear objections.
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
next prev parent reply other threads:[~2020-04-12 21:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-12 20:25 [PATCH] clone3: fix cgroup argument sanity check Eugene Syromiatnikov
2020-04-12 21:10 ` Christian Brauner [this message]
2020-04-15 12:38 ` Christian Brauner
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