linux-kernel - Re: [PATCH v2 0/6] unwind, arm64: add sframe unwinder for kernel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CADBMgpwZ32+shSa0SwO8y4G-Zw14ae-FcoWreA_ptMf08Mu9dA@mail.gmail.com>
Date: Fri, 14 Nov 2025 22:50:16 -0800
From: Dylan Hatch <dylanbhatch@...gle.com>
To: Puranjay Mohan <puranjay12@...il.com>
Cc: Song Liu <song@...nel.org>, Josh Poimboeuf <jpoimboe@...nel.org>, 
	Steven Rostedt <rostedt@...dmis.org>, Indu Bhagat <indu.bhagat@...cle.com>, 
	Peter Zijlstra <peterz@...radead.org>, Will Deacon <will@...nel.org>, 
	Catalin Marinas <catalin.marinas@....com>, Jiri Kosina <jikos@...nel.org>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Weinan Liu <wnliu@...gle.com>, 
	Mark Rutland <mark.rutland@....com>, Ian Rogers <irogers@...gle.com>, 
	linux-toolchains@...r.kernel.org, linux-kernel@...r.kernel.org, 
	live-patching@...r.kernel.org, joe.lawrence@...hat.com, 
	Puranjay Mohan <puranjay@...nel.org>
Subject: Re: [PATCH v2 0/6] unwind, arm64: add sframe unwinder for kernel

On Mon, Sep 29, 2025 at 12:55 PM Puranjay Mohan <puranjay12@...il.com> wrote:
>
> I will try to debug this more but am just curious about BPF's
> interactions with sframe.
> The sframe data for bpf programs doesn't exist, so we would need to
> add that support
> and that wouldn't be trivial, given the BPF programs are JITed.
>
> Thanks,
> Puranjay

>From what I can tell, the ORC unwinder in x86 falls back to using
frame pointers in cases of generated code, like BPF. Would matching
this behavior in the sframe unwinder be a reasonable approach, at
least for the purposes of enabling reliable unwind for livepatch?

Thanks,
Dylan