This is a note to let you know that I've just added the patch titled
x86: Fix .brk attribute in linker script
to the 5.15-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-fix-.brk-attribute-in-linker-script.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7e09ac27f43b382f5fe9bb7c7f4c465ece1f8a23 Mon Sep 17 00:00:00 2001
From: Juergen Gross <jgross@xxxxxxxx>
Date: Thu, 30 Jun 2022 09:14:41 +0200
Subject: x86: Fix .brk attribute in linker script
From: Juergen Gross <jgross@xxxxxxxx>
commit 7e09ac27f43b382f5fe9bb7c7f4c465ece1f8a23 upstream.
Commit in Fixes added the "NOLOAD" attribute to the .brk section as a
"failsafe" measure.
Unfortunately, this leads to the linker no longer covering the .brk
section in a program header, resulting in the kernel loader not knowing
that the memory for the .brk section must be reserved.
This has led to crashes when loading the kernel as PV dom0 under Xen,
but other scenarios could be hit by the same problem (e.g. in case an
uncompressed kernel is used and the initrd is placed directly behind
it).
So drop the "NOLOAD" attribute. This has been verified to correctly
cover the .brk section by a program header of the resulting ELF file.
Fixes: e32683c6f7d2 ("x86/mm: Fix RESERVE_BRK() for older binutils")
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Reviewed-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220630071441.28576-4-jgross@xxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/vmlinux.lds.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -411,7 +411,7 @@ SECTIONS
__end_of_kernel_reserve = .;
. = ALIGN(PAGE_SIZE);
- .brk (NOLOAD) : AT(ADDR(.brk) - LOAD_OFFSET) {
+ .brk : AT(ADDR(.brk) - LOAD_OFFSET) {
__brk_base = .;
. += 64 * 1024; /* 64k alignment slop space */
*(.bss..brk) /* areas brk users have reserved */
Patches currently in stable-queue which might be from jgross@xxxxxxxx are
queue-5.15/x86-fix-.brk-attribute-in-linker-script.patch
