Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions

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To: Steven Rostedt <rostedt@xxxxxxxxxxx>
Subject: Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Thu, 2 May 2019 18:29:35 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Nicolai Stange <nstange@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Jiri Kosina <jikos@xxxxxxxxxx>, Miroslav Benes <mbenes@xxxxxxx>, Petr Mladek <pmladek@xxxxxxxx>, Joe Lawrence <joe.lawrence@xxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>, Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>, Mimi Zohar <zohar@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Nayna Jain <nayna@xxxxxxxxxxxxx>, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>, Joerg Roedel <jroedel@xxxxxxx>, "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@xxxxxxxxxxxxxxx>, stable@xxxxxxxxxxxxxxx
In-reply-to: <20190502162133.GX2623@hirez.programming.kicks-ass.net>
User-agent: Mutt/1.10.1 (2018-07-13)

On Thu, May 02, 2019 at 06:21:33PM +0200, Peter Zijlstra wrote:
> Much thanks to Joerg Roedel for talking entry_32.S with me.
> 
> TL;DR, on x86_32 kernel->kernel IRET frames are only 3 entries and do
> not include ESP/SS, so not only wasn't regs->sp setup, if you changed it
> it wouldn't be effective and corrupt random stack state.

Also, i386 is bloody insane...

References:
- [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Steven Rostedt
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Steven Rostedt
- Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
  - From: Peter Zijlstra

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