x86, kaslr: Handle Gold linker for finding bss/brk

commit 70b61e362187b5fccac206506d402f3424e3e749 upstream.

When building with the Gold linker, the .bss and .brk areas of vmlinux
are shown as consecutive instead of having the same file offset. Allow
for either state, as long as things add up correctly.

Fixes: e6023367d779 ("x86, kaslr: Prevent .bss from overlaping initrd")
Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Junjie Mao <eternal.n08@gmail.com>
Link: http://lkml.kernel.org/r/20141118001604.GA25045@www.outflux.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/tools/calc_run_size.pl b/arch/x86/tools/calc_run_size.pl
index 0b0b124..23210ba 100644 (file)
--- a/arch/x86/tools/calc_run_size.pl
+++ b/arch/x86/tools/calc_run_size.pl
@@ -19,7 +19,16 @@ while (<>) {
                if ($file_offset == 0) {
                        $file_offset = $offset;
                } elsif ($file_offset != $offset) {
-                       die ".bss and .brk lack common file offset\n";
+                       # BFD linker shows the same file offset in ELF.
+                       # Gold linker shows them as consecutive.
+                       next if ($file_offset + $mem_size == $offset + $size);
+
+                       printf STDERR "file_offset: 0x%lx\n", $file_offset;
+                       printf STDERR "mem_size: 0x%lx\n", $mem_size;
+                       printf STDERR "offset: 0x%lx\n", $offset;
+                       printf STDERR "size: 0x%lx\n", $size;
+
+                       die ".bss and .brk are non-contiguous\n";
                }
        }
 }