From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Philippe Gerum <rpm@xenomai.org>
Cc: xenomai-help <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] native: A 32k stack is not always a 'reasonable' size
Date: Thu, 08 Jul 2010 12:09:55 +0200 [thread overview]
Message-ID: <4C35A3F3.6040005@domain.hid> (raw)
In-Reply-To: <4C35A2B3.9060606@domain.hid>
Gilles Chanteperdrix wrote:
> Philippe Gerum wrote:
>> On Thu, 2010-07-08 at 11:35 +0200, Gilles Chanteperdrix wrote:
>>> + down_read(&mm->mmap_sem);
>>> + if (find_vma(mm, addr) == find_vma(mm, regs->ARM_sp))
>>> + printk(KERN_INFO "FCSE: process %u(%s) probably overflowed stack
>>> at 0x%08lx.\n",
>>> + current->pid, current->comm, regs->ARM_pc);
>>> + up_read(&mm->mmap_sem);
>>>
>> My understanding is that such code detects faulty references within the
>> _valid_ address space, typically when hitting a page guard area. But I
>> guess that this won't work when treading on stack memory outside of the
>> address space, e.g. below the red zone for instance, isn't it? AFAIU,
>> those things may happen when the heading space of preposterously large
>> stack-based objects are addressed.
>
> Yes, exactly, but that would have been enough to detect Peter's problem.
> I thought gcc had an option to yell when the objects on stack grow
> beyond some size, but I can not find it.
The option is enabled by the kernel when enabling CONFIG_WARN_FRAME, and
is -Wframe-larger-than
It seems to require gcc 4.4 though.
--
Gilles.
next prev parent reply other threads:[~2010-07-08 10:09 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-06 19:25 [Xenomai-help] native: A 32k stack is not always a 'reasonable' size Peter Soetens
2010-07-07 9:06 ` Gilles Chanteperdrix
2010-07-07 20:57 ` Peter Soetens
2010-07-07 21:19 ` Gilles Chanteperdrix
2010-07-07 22:31 ` Peter Soetens
2010-07-07 23:08 ` Gilles Chanteperdrix
2010-07-08 8:37 ` Philippe Gerum
2010-07-08 8:58 ` Gilles Chanteperdrix
2010-07-08 9:31 ` Philippe Gerum
2010-07-08 9:35 ` Gilles Chanteperdrix
2010-07-08 9:58 ` Philippe Gerum
2010-07-08 10:04 ` Gilles Chanteperdrix
2010-07-08 10:09 ` Gilles Chanteperdrix [this message]
2010-07-08 11:52 ` Gilles Chanteperdrix
2010-07-08 9:50 ` Philippe Gerum
2010-07-08 9:55 ` Gilles Chanteperdrix
2010-07-08 10:19 ` Philippe Gerum
2010-07-08 11:47 ` Gilles Chanteperdrix
2010-07-08 15:01 ` Philippe Gerum
2010-07-08 16:33 ` Gilles Chanteperdrix
2010-07-11 13:15 ` Gilles Chanteperdrix
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