diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0070-x86-retpoline-ftrace-Convert-ftrace-assembler-indire.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0070-x86-retpoline-ftrace-Convert-ftrace-assembler-indire.patch | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0070-x86-retpoline-ftrace-Convert-ftrace-assembler-indire.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0070-x86-retpoline-ftrace-Convert-ftrace-assembler-indire.patch new file mode 100644 index 00000000..a05a7c2d --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0070-x86-retpoline-ftrace-Convert-ftrace-assembler-indire.patch @@ -0,0 +1,94 @@ +From d9839707e5f87bc4b33d634d0d53b38acd3e22de Mon Sep 17 00:00:00 2001 +From: David Woodhouse <dwmw@amazon.co.uk> +Date: Thu, 11 Jan 2018 21:46:29 +0000 +Subject: [PATCH 070/103] x86/retpoline/ftrace: Convert ftrace assembler + indirect jumps + +commit 9351803bd803cdbeb9b5a7850b7b6f464806e3db upstream. + +Convert all indirect jumps in ftrace assembler code to use non-speculative +sequences when CONFIG_RETPOLINE is enabled. + +Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +Acked-by: Arjan van de Ven <arjan@linux.intel.com> +Acked-by: Ingo Molnar <mingo@kernel.org> +Cc: gnomes@lxorguk.ukuu.org.uk +Cc: Rik van Riel <riel@redhat.com> +Cc: Andi Kleen <ak@linux.intel.com> +Cc: Josh Poimboeuf <jpoimboe@redhat.com> +Cc: thomas.lendacky@amd.com +Cc: Peter Zijlstra <peterz@infradead.org> +Cc: Linus Torvalds <torvalds@linux-foundation.org> +Cc: Jiri Kosina <jikos@kernel.org> +Cc: Andy Lutomirski <luto@amacapital.net> +Cc: Dave Hansen <dave.hansen@intel.com> +Cc: Kees Cook <keescook@google.com> +Cc: Tim Chen <tim.c.chen@linux.intel.com> +Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org> +Cc: Paul Turner <pjt@google.com> +Link: https://lkml.kernel.org/r/1515707194-20531-8-git-send-email-dwmw@amazon.co.uk +Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + arch/x86/entry/entry_32.S | 5 +++-- + arch/x86/kernel/mcount_64.S | 7 ++++--- + 2 files changed, 7 insertions(+), 5 deletions(-) + +diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S +index 7b95f35..bdc9aea 100644 +--- a/arch/x86/entry/entry_32.S ++++ b/arch/x86/entry/entry_32.S +@@ -985,7 +985,8 @@ trace: + movl 0x4(%ebp), %edx + subl $MCOUNT_INSN_SIZE, %eax + +- call *ftrace_trace_function ++ movl ftrace_trace_function, %ecx ++ CALL_NOSPEC %ecx + + popl %edx + popl %ecx +@@ -1021,7 +1022,7 @@ return_to_handler: + movl %eax, %ecx + popl %edx + popl %eax +- jmp *%ecx ++ JMP_NOSPEC %ecx + #endif + + #ifdef CONFIG_TRACING +diff --git a/arch/x86/kernel/mcount_64.S b/arch/x86/kernel/mcount_64.S +index 7b0d3da..287ec3b 100644 +--- a/arch/x86/kernel/mcount_64.S ++++ b/arch/x86/kernel/mcount_64.S +@@ -8,7 +8,7 @@ + #include <asm/ptrace.h> + #include <asm/ftrace.h> + #include <asm/export.h> +- ++#include <asm/nospec-branch.h> + + .code64 + .section .entry.text, "ax" +@@ -290,8 +290,9 @@ trace: + * ip and parent ip are used and the list function is called when + * function tracing is enabled. + */ +- call *ftrace_trace_function + ++ movq ftrace_trace_function, %r8 ++ CALL_NOSPEC %r8 + restore_mcount_regs + + jmp fgraph_trace +@@ -334,5 +335,5 @@ GLOBAL(return_to_handler) + movq 8(%rsp), %rdx + movq (%rsp), %rax + addq $24, %rsp +- jmp *%rdi ++ JMP_NOSPEC %rdi + #endif +-- +2.7.4 + |