From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
Anton Arapov <arapov@gmail.com>,
David Long <dave.long@linaro.org>,
Denys Vlasenko <dvlasenk@redhat.com>,
"Frank Ch. Eigler" <fche@redhat.com>,
Ingo Molnar <mingo@kernel.org>, Jan Willeke <willeke@de.ibm.com>,
Jim Keniston <jkenisto@us.ibm.com>,
Mark Wielaard <mjw@redhat.com>,
Pratyush Anand <panand@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 07/10] uprobes/x86: Introduce arch_uretprobe_is_alive()
Date: Thu, 7 May 2015 16:38:52 +0530 [thread overview]
Message-ID: <20150507110852.GF30396@linux.vnet.ibm.com> (raw)
In-Reply-To: <20150504124914.GA22512@redhat.com>
>
> diff --git a/arch/x86/include/asm/uprobes.h b/arch/x86/include/asm/uprobes.h
> index f011fd0..60777f3 100644
> --- a/arch/x86/include/asm/uprobes.h
> +++ b/arch/x86/include/asm/uprobes.h
> @@ -57,6 +57,7 @@ struct arch_uprobe {
> };
>
> struct arch_uretprobe {
> + unsigned long sp;
While this looks good, I was wondering if you did think of having the sp
in the return_instance structure itself. I mean can we use
user_stack_pointer() to populate the ri->sp?
In which case the weak function itself should suffice for most archs.
Something like this.
prepare_uretprobe() we can have
ri->sp = user_stack_pointer(regs)
and handle_trampoline() would call something like
arch_uretprobe_is_alive(next->sp, regs);
bool __weak arch_uretprobe_is_alive(unsigned long sp, struct pt_regs *regs)
{
return user_stack_pointer(regs) <= sp;
}
Am I missing something?
>
--
Thanks and Regards
Srikar Dronamraju
next prev parent reply other threads:[~2015-05-07 11:09 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-04 12:48 [PATCH 00/10] uprobes: longjmp fixes Oleg Nesterov
2015-05-04 12:48 ` [PATCH 01/10] uprobes: Introduce get_uprobe() Oleg Nesterov
2015-05-06 13:20 ` Srikar Dronamraju
2015-05-04 12:48 ` [PATCH 02/10] uprobes: Introduce free_ret_instance() Oleg Nesterov
2015-05-06 13:22 ` Srikar Dronamraju
2015-05-04 12:48 ` [PATCH 03/10] uprobes: Send SIGILL if handle_trampoline() fails Oleg Nesterov
2015-05-06 13:30 ` Srikar Dronamraju
2015-05-04 12:49 ` [PATCH 04/10] uprobes: Change prepare_uretprobe() to use uprobe_warn() Oleg Nesterov
2015-05-07 10:32 ` Srikar Dronamraju
2015-05-04 12:49 ` [PATCH 05/10] uprobes: Change handle_trampoline() to find the next chain beforehand Oleg Nesterov
2015-05-07 10:33 ` Srikar Dronamraju
2015-05-04 12:49 ` [PATCH 06/10] uprobes: Introduce struct arch_uretprobe Oleg Nesterov
2015-05-07 10:34 ` Srikar Dronamraju
2015-05-04 12:49 ` [PATCH 07/10] uprobes/x86: Introduce arch_uretprobe_is_alive() Oleg Nesterov
2015-05-07 10:35 ` Srikar Dronamraju
2015-05-07 11:08 ` Srikar Dronamraju [this message]
2015-05-07 17:11 ` Oleg Nesterov
2015-05-08 11:30 ` Srikar Dronamraju
2015-05-10 12:21 ` Oleg Nesterov
2015-05-13 8:11 ` Srikar Dronamraju
2015-05-20 16:51 ` Oleg Nesterov
2015-05-18 12:08 ` Pratyush Anand
2015-05-20 15:51 ` Oleg Nesterov
2015-05-04 12:49 ` [PATCH 08/10] uprobes: Change handle_trampoline() to flush the frames invalidated by longjmp() Oleg Nesterov
2015-05-07 10:38 ` Srikar Dronamraju
2015-05-04 12:49 ` [PATCH 09/10] uprobes: Change prepare_uretprobe() to (try to) flush the dead frames Oleg Nesterov
2015-05-07 11:19 ` Srikar Dronamraju
2015-06-05 21:40 ` Oleg Nesterov
2015-05-04 12:49 ` [PATCH 10/10] uprobes/x86: Change arch_uretprobe_is_alive() to take !chained into account Oleg Nesterov
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