linux-kernel - Re: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples

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: <CA+55aFzqoz7dcUCQfSrXxX2T8=2wgWdb1H2vaBhk7V-r0uaogw@mail.gmail.com>
Date:	Fri, 6 Jul 2012 11:16:57 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	mingo@...nel.org, hpa@...or.com, eranian@...gle.com,
	linux-kernel@...r.kernel.org, fweisbec@...il.com,
	akpm@...ux-foundation.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples

On Fri, Jul 6, 2012 at 11:12 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>
> PEBS, BTS, LBR don't have CS. PEBS does have eflags.
>
> If we cannot do this I'm not sure what we can do :/

Well, you're passed in a "pt_regs". Which *does* have CS, and has it right.

If some code then changes the values in the pt_regs, it is *that* code
that needs to think twice about what it does. Where is that code?

                 Linus
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/