linux-kernel - Re: [PATCH] x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read

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Date:   Sat, 15 Aug 2020 10:38:58 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Jann Horn <jannh@...gle.com>,
        syzbot <syzkaller@...glegroups.com>,
        Andy Lutomirski <luto@...nel.org>,
        "Chang S . Bae" <chang.seok.bae@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Markus T Metzger <markus.t.metzger@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ravi Shankar <ravi.v.shankar@...el.com>,
        Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task

On Sat, Aug 15, 2020 at 4:48 AM Ingo Molnar <mingo@...nel.org> wrote:
>
>
> * Eric Dumazet <edumazet@...gle.com> wrote:
>
> > syzbot found its way in 86_fsgsbase_read_task() [1]
> >
> > Fix is to make sure ldt pointer is not NULL.
>
> Thanks for this fix. Linus has picked it up (inclusive the typos to
> the x86_fsgsbase_read_task() function name ;-), it's now upstream
> under:
>
>   8ab49526b53d: ("x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task")
>
> By the fixes tag it looks like this should probably be backported all
> the way back to ~v4.20 or so?

This is absolutely right, sorry about the lack of a stable tag.

Most of my patches usually land into David Miller trees, where the
stable tag is not welcomed.
We use  Fixes: tags to convey the exact information needed for stable backports.

Thanks.