This is a note to let you know that I've just added the patch titled
vmlinux.lds.h: Fix placement of '.data..decrypted' section
to the 6.0-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:
vmlinux.lds.h-fix-placement-of-.data..decrypted-section.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 000f8870a47bdc36730357883b6aef42bced91ee Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <nathan@xxxxxxxxxx>
Date: Tue, 8 Nov 2022 10:49:34 -0700
Subject: vmlinux.lds.h: Fix placement of '.data..decrypted' section
From: Nathan Chancellor <nathan@xxxxxxxxxx>
commit 000f8870a47bdc36730357883b6aef42bced91ee upstream.
Commit d4c639990036 ("vmlinux.lds.h: Avoid orphan section with !SMP")
fixed an orphan section warning by adding the '.data..decrypted' section
to the linker script under the PERCPU_DECRYPTED_SECTION define but that
placement introduced a panic with !SMP, as the percpu sections are not
instantiated with that configuration so attempting to access variables
defined with DEFINE_PER_CPU_DECRYPTED() will result in a page fault.
Move the '.data..decrypted' section to the DATA_MAIN define so that the
variables in it are properly instantiated at boot time with
CONFIG_SMP=n.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: d4c639990036 ("vmlinux.lds.h: Avoid orphan section with !SMP")
Link: https://lore.kernel.org/cbbd3548-880c-d2ca-1b67-5bb93b291d5f@xxxxxxxxxx/
Debugged-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Reported-by: Zhao Wenhui <zhaowenhui8@xxxxxxxxxx>
Tested-by: xiafukun <xiafukun@xxxxxxxxxx>
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221108174934.3384275-1-nathan@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/asm-generic/vmlinux.lds.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -333,6 +333,7 @@
#define DATA_DATA \
*(.xiptext) \
*(DATA_MAIN) \
+ *(.data..decrypted) \
*(.ref.data) \
*(.data..shared_aligned) /* percpu related */ \
MEM_KEEP(init.data*) \
@@ -975,7 +976,6 @@
#ifdef CONFIG_AMD_MEM_ENCRYPT
#define PERCPU_DECRYPTED_SECTION \
. = ALIGN(PAGE_SIZE); \
- *(.data..decrypted) \
*(.data..percpu..decrypted) \
. = ALIGN(PAGE_SIZE);
#else
Patches currently in stable-queue which might be from nathan@xxxxxxxxxx are
queue-6.0/vmlinux.lds.h-fix-placement-of-.data..decrypted-section.patch
