linux-kernel - Re: [PATCH 1/3] recordmcount: fix endianness handling bug for nop

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Message-ID: <56332E1C.1000206@huawei.com>
Date:	Fri, 30 Oct 2015 16:45:16 +0800
From:	libin <huawei.libin@...wei.com>
To:	<will.deacon@....com>, <lkp@...el.com>, <catalin.marinas@....com>,
	<rostedt@...dmis.org>, <takahiro.akashi@...aro.org>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <guohanjun@...wei.com>,
	<dingtianhong@...wei.com>, <zhouchengming1@...wei.com>,
	<xiexiuqi@...wei.com>
Subject: Re: [PATCH 1/3] recordmcount: fix endianness handling bug for
 nop_mcount



on 2015/10/30 16:31, Li Bin wrote:
> In nop_mcount, shdr->sh_offset and welp->r_offset should handle
> endianness properly, otherwise it will trigger Segmentation fault
> if the recordmcount main and file.o have different endianness.
> 

For more information, please refer to
	https://lkml.org/lkml/2015/10/29/258

> Cc: <stable@...r.kernel.org> # 3.0+
> Signed-off-by: Li Bin <huawei.libin@...wei.com>
> ---
>  scripts/recordmcount.h | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h
> index 49b582a..dda9dba 100644
> --- a/scripts/recordmcount.h
> +++ b/scripts/recordmcount.h
> @@ -376,8 +376,9 @@ static void nop_mcount(Elf_Shdr const *const relhdr,
>  			mcountsym = get_mcountsym(sym0, relp, str0);
>  
>  		if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp)) {
> -			if (make_nop)
> -				ret = make_nop((void *)ehdr, shdr->sh_offset + relp->r_offset);
> +			if (make_nop) {
> +				ret = make_nop((void *)ehdr, _w(shdr->sh_offset) + _w(relp->r_offset));
> +			}
>  			if (warn_on_notrace_sect && !once) {
>  				printf("Section %s has mcount callers being ignored\n",
>  				       txtname);
> 

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