linux-kernel - Re: [PATCH 9/9] ARM: add uprobes support

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Date:	Wed, 17 Oct 2012 19:54:24 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Rabin Vincent <rabin@....in>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Subject: Re: [PATCH 9/9] ARM: add uprobes support

On 10/14, Rabin Vincent wrote:
>
> @@ -655,6 +656,9 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
>  					return restart;
>  				}
>  				syscall = 0;
> +			} else if (thread_flags & _TIF_UPROBE) {
> +				clear_thread_flag(TIF_UPROBE);
> +				uprobe_notify_resume(regs);
>  			} else {
>  				clear_thread_flag(TIF_NOTIFY_RESUME);
>  				tracehook_notify_resume(regs);

This doesn't look right. do_signal() can modify instruction pointer
after we hit the breakpoint. IOW, uprobe_notify_resume() should be
called before do_signal().

Oleg.

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