This is a note to let you know that I've just added the patch titled
s390/setup: init jump labels before command line parsing
to the 4.19-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:
s390-setup-init-jump-labels-before-command-line-parsing.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 95e61b1b5d6394b53d147c0fcbe2ae70fbe09446 Mon Sep 17 00:00:00 2001
From: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Date: Thu, 18 Jun 2020 17:17:19 +0200
Subject: s390/setup: init jump labels before command line parsing
From: Vasily Gorbik <gor@xxxxxxxxxxxxx>
commit 95e61b1b5d6394b53d147c0fcbe2ae70fbe09446 upstream.
Command line parameters might set static keys. This is true for s390 at
least since commit 6471384af2a6 ("mm: security: introduce init_on_alloc=1
and init_on_free=1 boot options"). To avoid the following WARN:
static_key_enable_cpuslocked(): static key 'init_on_alloc+0x0/0x40' used
before call to jump_label_init()
call jump_label_init() just before parse_early_param().
jump_label_init() is safe to call multiple times (x86 does that), doesn't
do any memory allocations and hence should be safe to call that early.
Fixes: 6471384af2a6 ("mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options")
Cc: <stable@xxxxxxxxxxxxxxx> # 5.3: d6df52e9996d: s390/maccess: add no DAT mode to kernel_write
Cc: <stable@xxxxxxxxxxxxxxx> # 5.3
Reviewed-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/kernel/setup.c | 1 +
1 file changed, 1 insertion(+)
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -909,6 +909,7 @@ void __init setup_arch(char **cmdline_p)
if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
nospec_auto_detect();
+ jump_label_init();
parse_early_param();
#ifdef CONFIG_CRASH_DUMP
/* Deactivate elfcorehdr= kernel parameter */
Patches currently in stable-queue which might be from gor@xxxxxxxxxxxxx are
queue-4.19/s390-setup-init-jump-labels-before-command-line-parsing.patch
queue-4.19/s390-maccess-add-no-dat-mode-to-kernel_write.patch
queue-4.19/s390-kprobes-fix-irq-mask-clobbering-on-kprobe-reenter-from-post_handler.patch
queue-4.19/s390-kprobes-fix-current_kprobe-never-cleared-after-kprobes-reenter.patch
