linux-kernel - Re: [PATCH v2 1/1] mm/madvise: replace ptrace attach requirement for process

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Message-ID: <c586aa93-52d7-bd6c-3d5-77be4ed4afae@namei.org>
Date:   Wed, 20 Jan 2021 16:01:13 +1100 (AEDT)
From:   James Morris <jmorris@...ei.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>, jannh@...gle.com,
        Kees Cook <keescook@...omium.org>, jeffv@...gle.com,
        minchan@...nel.org, mhocko@...e.com, shakeelb@...gle.com,
        rientjes@...gle.com, edgararriaga@...gle.com, timmurray@...gle.com,
        linux-mm@...ck.org, selinux@...r.kernel.org,
        linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, linux-security-module@...r.kernel.org
Subject: Re: [PATCH v2 1/1] mm/madvise: replace ptrace attach requirement
 for process_madvise

On Mon, 11 Jan 2021, Suren Baghdasaryan wrote:

> Replace PTRACE_MODE_ATTACH with a combination of PTRACE_MODE_READ
> and CAP_SYS_NICE. PTRACE_MODE_READ to prevent leaking ASLR metadata
> and CAP_SYS_NICE for influencing process performance.


Almost missed these -- please cc the LSM mailing list when modifying 
capabilities or other LSM-related things.

-- 
James Morris
<jmorris@...ei.org>