diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0012-x86-speculation-objtool-Annotate-indirect-calls-jump.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0012-x86-speculation-objtool-Annotate-indirect-calls-jump.patch | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0012-x86-speculation-objtool-Annotate-indirect-calls-jump.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0012-x86-speculation-objtool-Annotate-indirect-calls-jump.patch new file mode 100644 index 00000000..62777941 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0012-x86-speculation-objtool-Annotate-indirect-calls-jump.patch @@ -0,0 +1,101 @@ +From 05395f5046a3ff9280cde5804ff4505bbd42b115 Mon Sep 17 00:00:00 2001 +From: Peter Zijlstra <peterz@infradead.org> +Date: Wed, 17 Jan 2018 22:34:34 +0100 +Subject: [PATCH 12/14] x86/speculation, objtool: Annotate indirect calls/jumps + for objtool + +commit 9e0e3c5130e949c389caabc8033e9799b129e429 upstream. + +Annotate the indirect calls/jumps in the CALL_NOSPEC/JUMP_NOSPEC +alternatives. + +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/include/asm/nospec-branch.h | 27 +++++++++++++++++++++++---- + 1 file changed, 23 insertions(+), 4 deletions(-) + +diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h +index 031840a..29e8f30 100644 +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -68,6 +68,18 @@ + .endm + + /* ++ * This should be used immediately before an indirect jump/call. It tells ++ * objtool the subsequent indirect jump/call is vouched safe for retpoline ++ * builds. ++ */ ++.macro ANNOTATE_RETPOLINE_SAFE ++ .Lannotate_\@: ++ .pushsection .discard.retpoline_safe ++ _ASM_PTR .Lannotate_\@ ++ .popsection ++.endm ++ ++/* + * These are the bare retpoline primitives for indirect jmp and call. + * Do not use these directly; they only exist to make the ALTERNATIVE + * invocation below less ugly. +@@ -103,9 +115,9 @@ + .macro JMP_NOSPEC reg:req + #ifdef CONFIG_RETPOLINE + ANNOTATE_NOSPEC_ALTERNATIVE +- ALTERNATIVE_2 __stringify(jmp *\reg), \ ++ ALTERNATIVE_2 __stringify(ANNOTATE_RETPOLINE_SAFE; jmp *\reg), \ + __stringify(RETPOLINE_JMP \reg), X86_FEATURE_RETPOLINE, \ +- __stringify(lfence; jmp *\reg), X86_FEATURE_RETPOLINE_AMD ++ __stringify(lfence; ANNOTATE_RETPOLINE_SAFE; jmp *\reg), X86_FEATURE_RETPOLINE_AMD + #else + jmp *\reg + #endif +@@ -114,9 +126,9 @@ + .macro CALL_NOSPEC reg:req + #ifdef CONFIG_RETPOLINE + ANNOTATE_NOSPEC_ALTERNATIVE +- ALTERNATIVE_2 __stringify(call *\reg), \ ++ ALTERNATIVE_2 __stringify(ANNOTATE_RETPOLINE_SAFE; call *\reg), \ + __stringify(RETPOLINE_CALL \reg), X86_FEATURE_RETPOLINE,\ +- __stringify(lfence; call *\reg), X86_FEATURE_RETPOLINE_AMD ++ __stringify(lfence; ANNOTATE_RETPOLINE_SAFE; call *\reg), X86_FEATURE_RETPOLINE_AMD + #else + call *\reg + #endif +@@ -144,6 +156,12 @@ + ".long 999b - .\n\t" \ + ".popsection\n\t" + ++#define ANNOTATE_RETPOLINE_SAFE \ ++ "999:\n\t" \ ++ ".pushsection .discard.retpoline_safe\n\t" \ ++ _ASM_PTR " 999b\n\t" \ ++ ".popsection\n\t" ++ + #if defined(CONFIG_X86_64) && defined(RETPOLINE) + + /* +@@ -153,6 +171,7 @@ + # define CALL_NOSPEC \ + ANNOTATE_NOSPEC_ALTERNATIVE \ + ALTERNATIVE( \ ++ ANNOTATE_RETPOLINE_SAFE \ + "call *%[thunk_target]\n", \ + "call __x86_indirect_thunk_%V[thunk_target]\n", \ + X86_FEATURE_RETPOLINE) +-- +2.7.4 + |