linux-kernel - Re: [RFC 0/5] perf: Per PMU access controls (paranoid setting)

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: <22155f49-2f57-73b8-6e89-ddd8a127967b@linux.intel.com>
Date:   Mon, 1 Oct 2018 09:25:42 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>, tursulin@...ulin.net,
        kernel list <linux-kernel@...r.kernel.org>,
        tvrtko.ursulin@...ux.intel.com,
        Peter Zijlstra <peterz@...radead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, maddy@...ux.vnet.ibm.com,
        Kees Cook <keescook@...omium.org>
Subject: Re: [RFC 0/5] perf: Per PMU access controls (paranoid setting)

Hello Jann,

> On Fri, Sep 28, 2018 at 11:22:37PM +0200, Jann Horn wrote:
<SNIP>
>>
>> <blasphemy>
>> Is that true? IIRC if you want to use the perf tools after a kernel
>> update, you have to install a new version of perf anyway, no?

There are usages in production where perf_event_open() syscall 
accompanied with read(), mmap() etc. is embedded into application 
on per-thread basis and is used for self monitoring and dynamic 
execution tuning.

There are also other Perf tools around that, for example, are 
statically linked and then used as on Linux as on Android.

Backward compatibility does matter in these cases.

Thanks,
Alexey