linux-kernel - Re: [PATCHv15 09/17] mm: Expose untagging mask in /proc/$PID/status

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAG_fn=UZK8c39grJBcrC+=8EhmO8KBkAq-zoo3kgg=GP616W7A@mail.gmail.com>
Date:   Fri, 10 Feb 2023 13:29:44 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        Kostya Serebryany <kcc@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Taras Madan <tarasmadan@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "H . J . Lu" <hjl.tools@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Bharata B Rao <bharata@....com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCHv15 09/17] mm: Expose untagging mask in /proc/$PID/status

On Mon, Jan 23, 2023 at 11:05 PM Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
>
> Add a line in /proc/$PID/status to report untag_mask. It can be
> used to find out LAM status of the process from the outside. It is
> useful for debuggers.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Acked-by: Catalin Marinas <catalin.marinas@....com>
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>


>         mm->context.untag_mask = -1UL;
> diff --git a/fs/proc/array.c b/fs/proc/array.c
> index 49283b8103c7..d2a94eafe9a3 100644
> --- a/fs/proc/array.c
> +++ b/fs/proc/array.c

Right now mm_untag_mask() is visible from array.c thanks to inclusion
of <linux/cpuset.h>, which happens to include <linux/mmu_context.h>.
But maybe it would be better to directly include mmu_context.h here?