4.16-stable review patch. If anyone has any objections, please let me know.
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From: Martin Schwidefsky schwidefsky@de.ibm.com
[ Upstream commit 6a3d1e81a434fc311f224b8be77258bafc18ccc6 ]
With CONFIG_EXPOLINE_AUTO=y the call of spectre_v2_auto_early() via early_initcall is done *after* the early_param functions. This overwrites any settings done with the nobp/no_spectre_v2/spectre_v2 parameters. The code patching for the kernel is done after the evaluation of the early parameters but before the early_initcall is done. The end result is a kernel image that is patched correctly but the kernel modules are not.
Make sure that the nospec auto detection function is called before the early parameters are evaluated and before the code patching is done.
Fixes: 6e179d64126b ("s390: add automatic detection of the spectre defense") Signed-off-by: Martin Schwidefsky schwidefsky@de.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/s390/include/asm/nospec-branch.h | 1 + arch/s390/kernel/nospec-branch.c | 8 ++------ arch/s390/kernel/setup.c | 3 +++ 3 files changed, 6 insertions(+), 6 deletions(-)
--- a/arch/s390/include/asm/nospec-branch.h +++ b/arch/s390/include/asm/nospec-branch.h @@ -9,6 +9,7 @@ extern int nospec_disable;
void nospec_init_branches(void); +void nospec_auto_detect(void); void nospec_revert(s32 *start, s32 *end);
#endif /* __ASSEMBLY__ */ --- a/arch/s390/kernel/nospec-branch.c +++ b/arch/s390/kernel/nospec-branch.c @@ -72,7 +72,7 @@ static int __init nospectre_v2_setup_ear } early_param("nospectre_v2", nospectre_v2_setup_early);
-static int __init spectre_v2_auto_early(void) +void __init nospec_auto_detect(void) { if (IS_ENABLED(CC_USING_EXPOLINE)) { /* @@ -87,11 +87,7 @@ static int __init spectre_v2_auto_early( * nobp setting decides what is done, this depends on the * CONFIG_KERNEL_NP option and the nobp/nospec parameters. */ - return 0; } -#ifdef CONFIG_EXPOLINE_AUTO -early_initcall(spectre_v2_auto_early); -#endif
static int __init spectre_v2_setup_early(char *str) { @@ -102,7 +98,7 @@ static int __init spectre_v2_setup_early if (str && !strncmp(str, "off", 3)) nospec_disable = 1; if (str && !strncmp(str, "auto", 4)) - spectre_v2_auto_early(); + nospec_auto_detect(); return 0; } early_param("spectre_v2", spectre_v2_setup_early); --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -893,6 +893,9 @@ void __init setup_arch(char **cmdline_p) init_mm.end_data = (unsigned long) &_edata; init_mm.brk = (unsigned long) &_end;
+ if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) + nospec_auto_detect(); + parse_early_param(); #ifdef CONFIG_CRASH_DUMP /* Deactivate elfcorehdr= kernel parameter */