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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Message-ID: <20210604165945.GA39381@sirena.org.uk>
Date:   Fri, 4 Jun 2021 17:59:45 +0100
From:   Mark Brown <broonie@...nel.org>
To:     madvenka@...ux.microsoft.com
Cc:     mark.rutland@....com, jpoimboe@...hat.com, ardb@...nel.org,
        nobuta.keiya@...itsu.com, catalin.marinas@....com, will@...nel.org,
        jmorris@...ei.org, pasha.tatashin@...een.com, jthierry@...hat.com,
        linux-arm-kernel@...ts.infradead.org,
        live-patching@...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

On Wed, May 26, 2021 at 04:49:17PM -0500, madvenka@...ux.microsoft.com wrote:

> + *	- return_to_handler() is handled by the unwinder by attempting to
> + *	  retrieve the original return address from the per-task return
> + *	  address stack.
> + *
> + *	- kretprobe_trampoline() can be handled in a similar fashion by
> + *	  attempting to retrieve the original return address from the per-task
> + *	  kretprobe instance list.
> + *
> + *	- I reckon optprobes can be handled in a similar fashion in the future?

Note that there's a patch for optprobes on the list now:

   https://lore.kernel.org/r/1622803839-27354-1-git-send-email-liuqi115@huawei.com

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