linux-kernel - Re: [PATCH] tracer for sys_open()

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: <c62985530901290717j1d72d26vdfa77d02a8d6fef5@mail.gmail.com>
Date:	Thu, 29 Jan 2009 16:17:54 +0100
From:	Frédéric Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	powertop ml <power@...host.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	srostedt@...hat.com,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Neil Horman <nhorman@...driver.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	utrace-devel@...hat.com, Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH] tracer for sys_open() - sreadahead

2009/1/29 Ingo Molnar <mingo@...e.hu>:
>
> * Frédéric Weisbecker <fweisbec@...il.com> wrote:
>
>> 2009/1/29 Ingo Molnar <mingo@...e.hu>:
>> >>
>> >> Several people talked me about utrace and gave some examples about it in
>> >> this discussion. The Api is very convenient to fetch syscall numbers,
>> >> arguments and return values. And the hooks are done in the generic core
>> >> code, so it is arch independent.
>> >>
>> >> The only drawback I can see is that it is not yet merged upstream, in
>> >> need of in-kernel users. If it only depends on this condition, we could
>> >> be these users...
>> >>
>> >> What do you think?
>> >
>> > sure - how do the minimal bits/callbacks look like which enable syscall
>> > tracing?
>> >
>> >        Ingo
>>
>>
>> There is a very straightforward example provided by Ananth in there:
>> http://lkml.org/lkml/2009/1/28/59
>
> I mean, how does the infrastructure patch look like - what code does this
> add to the kernel - just to get the syscall tracing bits. Lets get some
> progress here - it's clear that tracing syscalls is good, we just need to
> do it and look at actual patches.
>
>        Ingo
>

The latest snapshot version I've found is here:
http://people.redhat.com/roland/utrace/2.6-current/utrace.patch
This is mostly independent core code and a good number of hooks inside ptrace.

But I don't know much about the overhead it potentially brings on ptrace.
--
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/