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Message-ID: <CAK1hOcNvOFLero8Mw+j2chhY8WxFCxtx3ZQpYZLkLqNGtaSMrw@mail.gmail.com>
Date: Thu, 26 Jan 2012 15:02:21 +0100
From: Denys Vlasenko <vda.linux@...glemail.com>
To: Jamie Lokier <jamie@...reable.org>
Cc: Indan Zupancic <indan@....nu>, Oleg Nesterov <oleg@...hat.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andi Kleen <andi@...stfloor.org>,
Andrew Lutomirski <luto@....edu>,
Will Drewry <wad@...omium.org>, linux-kernel@...r.kernel.org,
keescook@...omium.org, john.johansen@...onical.com,
serge.hallyn@...onical.com, coreyb@...ux.vnet.ibm.com,
pmoore@...hat.com, eparis@...hat.com, djm@...drot.org,
segoon@...nwall.com, rostedt@...dmis.org, jmorris@...ei.org,
scarybeasts@...il.com, avi@...hat.com, penberg@...helsinki.fi,
viro@...iv.linux.org.uk, mingo@...e.hu, akpm@...ux-foundation.org,
khilman@...com, borislav.petkov@....com, amwang@...hat.com,
ak@...ux.intel.com, eric.dumazet@...il.com, gregkh@...e.de,
dhowells@...hat.com, daniel.lezcano@...e.fr,
linux-fsdevel@...r.kernel.org,
linux-security-module@...r.kernel.org, olofj@...omium.org,
mhalcrow@...gle.com, dlaor@...hat.com,
Roland McGrath <mcgrathr@...omium.org>
Subject: Re: Compat 32-bit syscall entry from 64-bit task!?
On Thu, Jan 26, 2012 at 12:01 PM, Jamie Lokier <jamie@...reable.org> wrote:
> Denys Vlasenko wrote:
>> On Thu, Jan 26, 2012 at 11:31 AM, Jamie Lokier <jamie@...reable.org> wrote:
>> >> It's still unclear if the PTRACE_EVENT_EXEC comes before or after
>> >> or instead of the post-execve ptrace event.
>>
>> Denis <- confused.
>> Was ist das "post-execve ptrace event"? I know no such thing.
>> I know about PTRACE_EVENT_EXEC, and "post-execve SIGTRAP".
>
> Sorry, I meant to write execve-syscall-exit event.
PTRACE_EVENT_EXEC happens before syscall exit. syscall exit
is not lost. Basically, the sequence is:
tracer tracee with tid N, tgid M
<------------- syscall entry for execve, pid=N
PTRACE_SYSCALL--->
<------------- PTRACE_EVENT_EXEC, pid=M
PTRACE_GETEVENTMSG-->
<------------- returns N ("I used to be tid N")
PTRACE_SYSCALL--->
<------------- syscall exit for execve, pid=M
...
--
vda
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