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

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Date:   Fri, 8 Jan 2021 14:17:17 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Jeffrey Vander Stoep <jeffv@...gle.com>,
        Michal Hocko <mhocko@...e.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Edgar Arriaga García <edgararriaga@...gle.com>,
        Tim Murray <timmurray@...gle.com>,
        linux-mm <linux-mm@...ck.org>, selinux@...r.kernel.org,
        Linux API <linux-api@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...roid.com>
Subject: Re: [PATCH 1/1] mm/madvise: replace ptrace attach requirement for process_madvise

On Fri, Jan 8, 2021 at 2:15 PM Minchan Kim <minchan@...nel.org> wrote:
>
> On Fri, Jan 08, 2021 at 12:58:57PM -0800, Suren Baghdasaryan wrote:
> > process_madvise currently requires ptrace attach capability.
> > PTRACE_MODE_ATTACH gives one process complete control over another
> > process. It effectively removes the security boundary between the
> > two processes (in one direction). Granting ptrace attach capability
> > even to a system process is considered dangerous since it creates an
> > attack surface. This severely limits the usage of this API.
> > The operations process_madvise can perform do not affect the correctness
> > of the operation of the target process; they only affect where the data
> > is physically located (and therefore, how fast it can be accessed).
> > What we want is the ability for one process to influence another process
> > in order to optimize performance across the entire system while leaving
> > the security boundary intact.
> > 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.
> >
> > Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
>
> It sounds logical to me.
> If security folks don't see any concern and fix below,
>
> Acked-by: Minchan Kim <minchan@...nel.org>
>
> > @@ -1197,12 +1197,22 @@ SYSCALL_DEFINE5(process_madvise, int, pidfd, const struct iovec __user *, vec,
> >               goto release_task;
> >       }
> >
> > -     mm = mm_access(task, PTRACE_MODE_ATTACH_FSCREDS);
> > +     /* Require PTRACE_MODE_READ to avoid leaking ASLR metadata. */
> > +     mm = mm_access(task, PTRACE_MODE_READ_FSCREDS);
> >       if (IS_ERR_OR_NULL(mm)) {
> >               ret = IS_ERR(mm) ? PTR_ERR(mm) : -ESRCH;
> >               goto release_task;
> >       }
> >
> > +     /*
> > +      * Require CAP_SYS_NICE for influencing process performance. Note that
> > +      * only non-destructive hints are currently supported.
> > +      */
> > +     if (!capable(CAP_SYS_NICE)) {
> > +             ret = -EPERM;
> > +             goto release_task;
>
> mmput?

Ouch! Thanks for pointing it out! Will include in the next respin.

>
> > +     }
> > +
> >       total_len = iov_iter_count(&iter);
> >
> >       while (iov_iter_count(&iter)) {
> > --
> > 2.30.0.284.gd98b1dd5eaa7-goog
> >
>
> --
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