Re: [PATCH 1/2] alpha/ptrace: Record and handle the absence of switch_stack

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To: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Subject: Re: [PATCH 1/2] alpha/ptrace: Record and handle the absence of switch_stack
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Wed, 16 Jun 2021 21:02:17 +0000
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Michael Schmitz <schmitzmic@xxxxxxxxx>, linux-arch <linux-arch@xxxxxxxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Richard Henderson <rth@xxxxxxxxxxx>, Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>, Matt Turner <mattst88@xxxxxxxxx>, alpha <linux-alpha@xxxxxxxxxxxxxxx>, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, linux-m68k <linux-m68k@xxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxxxx>, Ley Foon Tan <ley.foon.tan@xxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>
In-reply-to: <878s398r4g.fsf@disp2133>
References: <5929e116-fa61-b211-342a-c706dcb834ca@gmail.com> <87fsxjorgs.fsf@disp2133> <87zgvqor7d.fsf_-_@disp2133> <CAHk-=wir2P6h+HKtswPEGDh+GKLMM6_h8aovpMcUHyQv2zJ5Og@mail.gmail.com> <87mtrpg47k.fsf@disp2133> <87pmwlek8d.fsf_-_@disp2133> <87k0mtek4n.fsf_-_@disp2133> <CAHk-=wiTEZN_3ipf51sh-csdusW4uGzAXq9m1JcMHu_c8OJ+pQ@mail.gmail.com> <CAHk-=whvNaYffE8Eaa4-jjYbF_r1u1sh5LF5zXFhdEP8hxySMQ@mail.gmail.com> <878s398r4g.fsf@disp2133>

On Wed, Jun 16, 2021 at 03:57:19PM -0500, Eric W. Biederman wrote:
 
> Do you know if struct switch_stack or pt_regs is ever exposeed to
> usespace?  They are both defined in arch/alpha/include/uapi/asm/ptrace.h
> which makes me think userspace must see those definitions somewhere.

	They are exposed, but why mess with those in the first
place?  thread_info->status is strictly thread-synchronous, so just
use it and be done with that...

References:
- Re: Kernel stack read with PTRACE_EVENT_EXIT and io_uring threads
  - From: Michael Schmitz
- Re: Kernel stack read with PTRACE_EVENT_EXIT and io_uring threads
  - From: Eric W. Biederman
- [PATCH] alpha: Add extra switch_stack frames in exit, exec, and kernel threads
  - From: Eric W. Biederman
- Re: [PATCH] alpha: Add extra switch_stack frames in exit, exec, and kernel threads
  - From: Linus Torvalds
- Re: [PATCH] alpha: Add extra switch_stack frames in exit, exec, and kernel threads
  - From: Eric W. Biederman
- [PATCH 0/2] alpha/ptrace: Improved switch_stack handling
  - From: Eric W. Biederman
- [PATCH 1/2] alpha/ptrace: Record and handle the absence of switch_stack
  - From: Eric W. Biederman
- Re: [PATCH 1/2] alpha/ptrace: Record and handle the absence of switch_stack
  - From: Linus Torvalds
- Re: [PATCH 1/2] alpha/ptrace: Record and handle the absence of switch_stack
  - From: Linus Torvalds
- Re: [PATCH 1/2] alpha/ptrace: Record and handle the absence of switch_stack
  - From: Eric W. Biederman

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