linux-kernel - Re: [PATCH] Kprobes blacklist: Conditionally add x86-specific symbols

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Date:	Fri, 08 Mar 2013 13:23:25 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	oskar.andero@...ymobile.com
Cc:	linux-kernel@...r.kernel.org, davem@...emloft.net,
	anil.s.keshavamurthy@...el.com, ananth@...ibm.com,
	radovan.lekanovic@...ymobile.com,
	� <bjorn.davidsson@...ymobile.com>
Subject: Re: [PATCH] Kprobes blacklist: Conditionally add x86-specific
 symbols

(2013/03/07 19:44), oskar.andero@...ymobile.com wrote:
> From: Bjorn Davidsson <bjorn.davidsson@...ymobile.com>
> 
> The kprobes blacklist contains x86-specific symbols.
> Looking for these in kallsyms takes unnecessary time
> during startup on non-X86 platform.
> Added #ifdef CONFIG_X86 around them.

Right. however, it might be better break that into
common and arch-specific lists, because there may be
other arch-specific non-probe-able functions on each
architecture...

Would you know some other black points on your platform?

Thank you,

> 
> Reviewed-by: Radovan Lekanovic <radovan.lekanovic@...ymobile.com>
> Signed-off-by: Björn Davidsson <bjorn.davidsson@...ymobile.com>
> Signed-off-by: Oskar Andero <oskar.andero@...ymobile.com>
> ---
>  kernel/kprobes.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> index e35be53..8c3796f 100644
> --- a/kernel/kprobes.c
> +++ b/kernel/kprobes.c
> @@ -95,9 +95,11 @@ static raw_spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
>   */
>  static struct kprobe_blackpoint kprobe_blacklist[] = {
>  	{"preempt_schedule",},
> +#ifdef CONFIG_X86
>  	{"native_get_debugreg",},
>  	{"irq_entries_start",},
>  	{"common_interrupt",},
> +#endif
>  	{"mcount",},	/* mcount can be called from everywhere */
>  	{NULL}    /* Terminator */
>  };
> 


-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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