4.9-stable review patch. If anyone has any objections, please let me know.
------------------ From: David Woodhouse <d...@amazon.co.uk> commit 99c6fa2511d8a683e61468be91b83f85452115fa upstream. Add the bug bits for spectre v1/2 and force them unconditionally for all cpus. Signed-off-by: David Woodhouse <d...@amazon.co.uk> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Cc: gno...@lxorguk.ukuu.org.uk Cc: Rik van Riel <r...@redhat.com> Cc: Andi Kleen <a...@linux.intel.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Jiri Kosina <ji...@kernel.org> Cc: Andy Lutomirski <l...@amacapital.net> Cc: Dave Hansen <dave.han...@intel.com> Cc: Kees Cook <keesc...@google.com> Cc: Tim Chen <tim.c.c...@linux.intel.com> Cc: Greg Kroah-Hartman <gre...@linux-foundation.org> Cc: Paul Turner <p...@google.com> Cc: sta...@vger.kernel.org Link: https://lkml.kernel.org/r/1515239374-23361-2-git-send-email-d...@amazon.co.uk Signed-off-by: Razvan Ghitulete <r...@amazon.de> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- arch/x86/include/asm/cpufeatures.h | 2 ++ arch/x86/kernel/cpu/common.c | 3 +++ 2 files changed, 5 insertions(+) --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -317,5 +317,7 @@ #define X86_BUG_MONITOR X86_BUG(12) /* IPI required to wake up remote CPU */ #define X86_BUG_AMD_E400 X86_BUG(13) /* CPU is among the affected by Erratum 400 */ #define X86_BUG_CPU_MELTDOWN X86_BUG(14) /* CPU is affected by meltdown attack and needs kernel page table isolation */ +#define X86_BUG_SPECTRE_V1 X86_BUG(15) /* CPU is affected by Spectre variant 1 attack with conditional branches */ +#define X86_BUG_SPECTRE_V2 X86_BUG(16) /* CPU is affected by Spectre variant 2 attack with indirect branches */ #endif /* _ASM_X86_CPUFEATURES_H */ --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -886,6 +886,9 @@ static void __init early_identify_cpu(st /* Assume for now that ALL x86 CPUs are insecure */ setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN); + setup_force_cpu_bug(X86_BUG_SPECTRE_V1); + setup_force_cpu_bug(X86_BUG_SPECTRE_V2); + fpu__init_system(c); }
