linux-kernel - Re: [PATCH 1/3] ring-buffer: Add uname to match criteria for persistent ring buffer

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

Message-ID: <CAHk-=wgpjLhSv9_rnAGS1adekEHMHbjVFvmZEuEmVftuo2sJBw@mail.gmail.com>
Date: Tue, 17 Dec 2024 11:38:00 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	stable@...r.kernel.org
Subject: Re: [PATCH 1/3] ring-buffer: Add uname to match criteria for
 persistent ring buffer

On Tue, 17 Dec 2024 at 11:01, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> But instead, I'll replace the text/data_deltas with a kaslr offset (it will
> only be exported if the trace contains data from a previous kernel so not
> to export the current kaslr offset).

Right - never export the KASRL offset for the *current* kernel, but
the same interface that exports the "previous kernel trace data" can
certainly export the KASLR for that previous case.

> Then, on our production systems, we'll save the meta data of the events we
> enable (this can include module events as well as dynamic events) and after
> a crash, we'll extract the data along with the saved data stored on disk,
> and be able to recreate the entire trace.

Yes. And if you save the module names and load addresses, you can now
hopefully sort out things like %s (and %pS) from modules too.

Although maybe they don't happen that often?

            Linus