hi Greg,
Please apply upstream 8ab49526b53d to all stable kernels containing
07e1d88adaae, which should be v4.20 and higher stable kernels.
Thanks,
Ingo
----- Forwarded message from Eric Dumazet <edumazet@xxxxxxxxxx> -----
Date: Sat, 15 Aug 2020 10:38:58 -0700
From: Eric Dumazet <edumazet@xxxxxxxxxx>
To: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>, Eric Dumazet <eric.dumazet@xxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, syzbot <syzkaller@xxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, "Chang S . Bae" <chang.seok.bae@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>,
Borislav Petkov <bp@xxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Denys Vlasenko <dvlasenk@xxxxxxxxxx>, "H . Peter Anvin" <hpa@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Markus T Metzger
<markus.t.metzger@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Ravi Shankar <ravi.v.shankar@xxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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@xxxxxxxxxx> wrote:
>
>
> * Eric Dumazet <edumazet@xxxxxxxxxx> 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.
----- End forwarded message -----
