This is a note to let you know that I've just added the patch titled
x86, kaslr: Handle Gold linker for finding bss/brk
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-kaslr-handle-gold-linker-for-finding-bss-brk.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 70b61e362187b5fccac206506d402f3424e3e749 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Mon, 17 Nov 2014 16:16:04 -0800
Subject: x86, kaslr: Handle Gold linker for finding bss/brk
From: Kees Cook <keescook@xxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Junjie Mao <eternal.n08@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20141118001604.GA25045@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/tools/calc_run_size.pl | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- 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";
}
}
}
Patches currently in stable-queue which might be from keescook@xxxxxxxxxxxx are
queue-3.17/x86-kaslr-handle-gold-linker-for-finding-bss-brk.patch
queue-3.17/x86-mm-set-nx-across-entire-pmd-at-boot.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html