linux-kernel - Re: [PATCH] ptrace: copy_thread() should clear TIF_SINGLESTEP and X86_EFLAGS

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]

Message-ID: <20091106215004.GA2232@redhat.com>
Date:	Fri, 6 Nov 2009 22:50:04 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] ptrace: copy_thread() should clear TIF_SINGLESTEP and
	X86_EFLAGS_TF

On 11/06, Roland McGrath wrote:
>
> There is also the TIF_FORCED_TF logic to check.

I thought this flag has no effect without TIF_SINGLESTEP, and it is
always updated by enable_single_step().

> Probably it should just
> call user_disable_single_step() instead.  Perhaps copy_process() should
> just call that and then no per-arch changes would be required.

OK, thanks, will resend tomorrow.

user_disable_single_step() is very much arch-dependent, I am worried
if it is safe to call it from copy_process(), when the new task_struct,
thread_info, etc are not properly initialized yet...

Oleg.

--
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/