linux-kernel - Re: [PATCH 4/14] avr32: use generic ptrace

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 3 Feb 2010 09:36:11 +0100
From:	Christoph Hellwig <hch@....de>
To:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
Cc:	Christoph Hellwig <hch@....de>, roland@...hat.com, oleg@...hat.com,
	akpm@...ux-foundation.org, hskinnemoen@...el.com,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 4/14] avr32: use generic ptrace_resume code

On Wed, Feb 03, 2010 at 08:47:37AM +0530, Haavard Skinnemoen wrote:
> Sounds like you found three bugs and fixed two of them. Can you tell me
> more about the last one, i.e. what should be done to disable
> single-stepping?

I don't think the flag clearing on PTRACE_KILL matters as the process
is a zombie and almost gone anyway, it's more an artefact of the
generic implementation that I wanted to mention.

It seems like avr32 implement single stepping by setting the
TIF_SINGLE_STEP and TIF_BREAKPOINT thread flags.  Simply clearing these
flags in user_disable_single_step and calling that function from
ptrace_disable (which currently clears them itself) should take care
of it. 
--
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/