linux-kernel - Re: [PATCH v2 3/5] ptrace: change tracehook_report_syscall

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Message-ID: <20091113195858.GA12049@redhat.com>
Date:	Fri, 13 Nov 2009 20:58:58 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Roland McGrath <roland@...hat.com>,
	Srinivasa Ds <srinivasa@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] ptrace: change tracehook_report_syscall_exit()
	to handle stepping

On 11/13, Andrew Morton wrote:
>
> On Thu, 12 Nov 2009 18:38:53 +0100
> Oleg Nesterov <oleg@...hat.com> wrote:
>
> > Change tracehook_report_syscall_exit() to look at step flag and send
> > the trap signal if needed.
> >
> > This change affects ia64, microblaze, parisc, powerpc, sh.  They pass
> > nonzero "step" argument to tracehook but since it was ignored the tracee
> > reports via ptrace_notify(), this is not right and not consistent.
>
> This patch conflicts with utrace-core.patch a bit:

Ah, indeed, sorry...

>   static inline void tracehook_report_syscall_exit(struct pt_regs *regs, int step)
>   {
>         if (step) {
>                 siginfo_t info;
>                 user_single_step_siginfo(current, regs, &info);
>                 force_sig_info(SIGTRAP, &info, current);
>                 return;
>         }
>
> +       if (task_utrace_flags(current) & UTRACE_EVENT(SYSCALL_EXIT))
> +               utrace_report_syscall_exit(regs);
>         ptrace_report_syscall(regs);
>   }
>
>
> utrace-core.patch is getting rather old.  What is its status?

Roland, given that you are going to send the updated utrace patch,
perhaps it makes sense to drop this old utrace-core.patch from -mm?

Oleg.

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