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.

Link: http://lkml.kernel.org/r/563806C7.7070606@huawei.com
Cc: <stable@vger.kernel.org> # 3.0+
Signed-off-by: Li Bin <huawei.libin@huawei.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h
index 49b582a..b9897e2 100644 (file)
--- a/scripts/recordmcount.h
+++ b/scripts/recordmcount.h
@@ -377,7 +377,7 @@ static void nop_mcount(Elf_Shdr const *const relhdr,
 
                if (mcountsym == Elf_r_sym(relp) && !is_fake_mcount(relp)) {
                        if (make_nop)
-                               ret = make_nop((void *)ehdr, shdr->sh_offset + relp->r_offset);
+                               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);