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

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Date:	Fri, 30 Oct 2015 16:31:02 +0800
From:	Li Bin <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>, <huawei.libin@...wei.com>
Subject: [PATCH 1/3] recordmcount: fix endianness handling bug for nop_mcount

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.

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);
-- 
1.7.12.4

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