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Date: Tue, 14 Jul 2020 20:45:20 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Heiko Carstens <heiko.carstens@...ibm.com>, Vasily Gorbik <gor@...ux.ibm.com> Subject: [PATCH 5.7 155/166] s390/setup: init jump labels before command line parsing From: Vasily Gorbik <gor@...ux.ibm.com> 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@...r.kernel.org> # 5.3: d6df52e9996d: s390/maccess: add no DAT mode to kernel_write Cc: <stable@...r.kernel.org> # 5.3 Reviewed-by: Heiko Carstens <heiko.carstens@...ibm.com> Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/s390/kernel/setup.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -1107,6 +1107,7 @@ 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 */
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