[lkml]   [2008]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] Subject: kprobes-x86: correct post-eip value in post_hander()
Ingo Molnar wrote:
> * Yakov Lerner <> wrote:
>> I was trying to get the address of instruction to be executed next
>> after the kprobed instruction. But regs->eip in post_handler()
>> contains value which is useless to the user. It's pre-corrected value.
>> This value is difficult to use without access to resume_execution(),
>> which is not exported anyway. I moved the invocation of post_handler()
>> to *after* resume_execution(). Now regs->eip contains meaningful value
>> in post_handler().
>> I do not think this change breaks any backward-compatibility. To make
>> meaning of the old value, post_handler() would need access to
>> resume_execution() which is not exported. I have difficulty to
>> believe that previous, uncorrected, regs->eip can be meaningfully used
>> in post_handler().
> thanks, i've added your patch to the .26 bucket of x86.git, but it would
> be nice to get an Ack/Nack from a kprobes person as well.
> Ingo

Ingo, I also tested this on x86-64/x86/ia64.

Acked-by: Masami Hiramatsu <>


Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division


 \ /
  Last update: 2008-03-22 00:23    [W:0.059 / U:1.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site