linux-kernel - RE: [RFC PATCH v5 2/2] arm64: Create a list of SYM_CODE functions, check return PC against list

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Date:   Wed, 16 Jun 2021 09:15:06 +0000
From:   "nobuta.keiya@...itsu.com" <nobuta.keiya@...itsu.com>
To:     'Suraj Jitindar Singh' <sjitindarsingh@...il.com>,
        "madvenka@...ux.microsoft.com" <madvenka@...ux.microsoft.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "ardb@...nel.org" <ardb@...nel.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "pasha.tatashin@...een.com" <pasha.tatashin@...een.com>,
        "jthierry@...hat.com" <jthierry@...hat.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH v5 2/2] arm64: Create a list of SYM_CODE functions,
 check return PC against list

Hi Suraj,

> 
> if (frame->fp == (unsigned long)task_pt_regs(tsk)->stackframe)
> 	return -ENOENT;

If I understand correctly, a similar final frame check is introduced in this patch:

arm64: Implement stack trace termination record
https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/commit/?id=7d7b720a4b80


It is currently merged into for-next/stacktrace branch.


Thanks & Best Regards,
Keiya Nobuta <nobuta.keiya@...itsu.com>
---------------------------------------------------------
Solution Development Dept. Software Div.
FUJITSU COMPUTER TECHNOLOGIES Ltd.