Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753545AbeAFLw6 (ORCPT + 1 other); Sat, 6 Jan 2018 06:52:58 -0500 Received: from smtp-fw-9101.amazon.com ([207.171.184.25]:5902 "EHLO smtp-fw-9101.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753417AbeAFLwx (ORCPT ); Sat, 6 Jan 2018 06:52:53 -0500 X-IronPort-AV: E=Sophos;i="5.46,321,1511827200"; d="scan'208";a="719840353" From: David Woodhouse To: Andi Kleen Cc: Paul Turner , LKML , Linus Torvalds , Greg Kroah-Hartman , Tim Chen , Dave Hansen , tglx@linutronix.de, Kees Cook , Rik van Riel , Peter Zijlstra , Andy Lutomirski , Jiri Kosina , gnomes@lxorguk.ukuu.org.uk Subject: [PATCH v5 05/12] x86/retpoline/ftrace: Convert ftrace assembler indirect jumps Date: Sat, 6 Jan 2018 11:49:27 +0000 Message-Id: <1515239374-23361-6-git-send-email-dwmw@amazon.co.uk> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1515239374-23361-1-git-send-email-dwmw@amazon.co.uk> References: <1515239374-23361-1-git-send-email-dwmw@amazon.co.uk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: Convert all indirect jumps in ftrace assembler code to use non-speculative sequences when CONFIG_RETPOLINE is enabled. Signed-off-by: David Woodhouse --- arch/x86/kernel/ftrace_32.S | 6 ++++-- arch/x86/kernel/ftrace_64.S | 8 ++++---- 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/ftrace_32.S b/arch/x86/kernel/ftrace_32.S index b6c6468..c3842c9 100644 --- a/arch/x86/kernel/ftrace_32.S +++ b/arch/x86/kernel/ftrace_32.S @@ -8,6 +8,7 @@ #include #include #include +#include #ifdef CC_USING_FENTRY # define function_hook __fentry__ @@ -197,7 +198,8 @@ ftrace_stub: movl 0x4(%ebp), %edx subl $MCOUNT_INSN_SIZE, %eax - call *ftrace_trace_function + movl ftrace_trace_function, %ecx + NOSPEC_CALL %ecx popl %edx popl %ecx @@ -241,5 +243,5 @@ return_to_handler: movl %eax, %ecx popl %edx popl %eax - jmp *%ecx + NOSPEC_JMP %ecx #endif diff --git a/arch/x86/kernel/ftrace_64.S b/arch/x86/kernel/ftrace_64.S index c832291..0893068 100644 --- a/arch/x86/kernel/ftrace_64.S +++ b/arch/x86/kernel/ftrace_64.S @@ -7,7 +7,7 @@ #include #include #include - +#include .code64 .section .entry.text, "ax" @@ -286,8 +286,8 @@ 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 + NOSPEC_CALL %r8 restore_mcount_regs jmp fgraph_trace @@ -329,5 +329,5 @@ GLOBAL(return_to_handler) movq 8(%rsp), %rdx movq (%rsp), %rax addq $24, %rsp - jmp *%rdi + NOSPEC_JMP %rdi #endif -- 2.7.4