4.9-stable review patch. If anyone has any objections, please let me know.
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From: Peter Zijlstra peterz@infradead.org
commit bd89004f6305cbf7352238f61da093207ee518d6 upstream.
The objtool retpoline validation found this indirect jump. Seeing how it's on CPU bringup before we run userspace it should be safe, annotate it.
Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Reviewed-by: David Woodhouse dwmw@amazon.co.uk Acked-by: Thomas Gleixner tglx@linutronix.de Acked-by: Josh Poimboeuf jpoimboe@redhat.com Cc: Andy Lutomirski luto@kernel.org Cc: Arjan van de Ven arjan@linux.intel.com Cc: Borislav Petkov bp@alien8.de Cc: Dan Williams dan.j.williams@intel.com Cc: Dave Hansen dave.hansen@linux.intel.com Cc: David Woodhouse dwmw2@infradead.org Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/kernel/head_64.S | 2 ++ 1 file changed, 2 insertions(+)
--- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -22,6 +22,7 @@ #include <asm/nops.h> #include "../entry/calling.h" #include <asm/export.h> +#include <asm/nospec-branch.h>
#ifdef CONFIG_PARAVIRT #include <asm/asm-offsets.h> @@ -200,6 +201,7 @@ ENTRY(secondary_startup_64)
/* Ensure I am executing from virtual addresses */ movq $1f, %rax + ANNOTATE_RETPOLINE_SAFE jmp *%rax 1: