linux-kernel - Re: [PATCH] x86/entry/64: Fix unwind hint for rewind_stack_do

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Message-ID: <20200306165839.wh5qqsmtwbfyirwi@treble>
Date:   Fri, 6 Mar 2020 10:58:39 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/entry/64: Fix unwind hint for rewind_stack_do_exit

On Thu, Mar 05, 2020 at 11:54:43PM +0100, Jann Horn wrote:
> The leaq instruction in rewind_stack_do_exit moves the stack pointer
> directly below the pt_regs at the top of the task stack before calling
> do_exit(). Tell the unwinder to expect pt_regs.
> 
> Signed-off-by: Jann Horn <jannh@...gle.com>

Thanks Jann.  This fits in nicely with my ORC series so I'll add it.

-- 
Josh