From patchwork Fri Mar 26 12:30:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 12166517 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2393C433DB for ; Fri, 26 Mar 2021 12:31:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A769661949 for ; Fri, 26 Mar 2021 12:31:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230107AbhCZMah (ORCPT ); Fri, 26 Mar 2021 08:30:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:53142 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229758AbhCZMaF (ORCPT ); Fri, 26 Mar 2021 08:30:05 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0EA6861949; Fri, 26 Mar 2021 12:30:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616761804; bh=KJfN3dfQ7CgYxygr2eqTq1OdnbRKmnmwZLg3RsPDjzE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ax68D1BtQrD6/z9bA+GSokvG1SWwLa2EqN6G/0V7lNwLT7hKALHdYfO1afh/5qx/K qQ1+wr3yHsQIlRRm6wPHhcSAqwzsaPRVgWhwerCD8ucHI2+tu7zDEzYUwLN1FfqwHD yKDq1CqB9EdUD5UheTwnIGYHq2isU4moaBV8TiInEoBMjUYGYOFmf9fQOQZ6XOgzQL Vkyl8vwsDflbHGxIpoDTleJRjcUP8RbvQ27xvGCBZZudBqD94fS2bJstWx6myT9Jxq AswbNQtqlkiXuRccr+4GcNByJXV1pk4qzenmaalAH+ZQG9CEW4FTR0Mkz+bLrrgrbA 7uL7dOQ+uxGuw== From: Masami Hiramatsu To: Steven Rostedt , Ingo Molnar Cc: X86 ML , Masami Hiramatsu , Daniel Xu , linux-kernel@vger.kernel.org, bpf@vger.kernel.org, kuba@kernel.org, mingo@redhat.com, ast@kernel.org, tglx@linutronix.de, kernel-team@fb.com, yhs@fb.com, Josh Poimboeuf , linux-ia64@vger.kernel.org, Abhishek Sagar Subject: [PATCH -tip v5 08/12] arm: kprobes: Make a space for regs->ARM_pc at kretprobe_trampoline Date: Fri, 26 Mar 2021 21:30:00 +0900 Message-Id: <161676180010.330141.3364405359635711987.stgit@devnote2> X-Mailer: git-send-email 2.25.1 In-Reply-To: <161676170650.330141.6214727134265514123.stgit@devnote2> References: <161676170650.330141.6214727134265514123.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Change kretprobe_trampoline to make a space for regs->ARM_pc so that kretprobe_trampoline_handler can call instruction_pointer_set() safely. Signed-off-by: Masami Hiramatsu --- arch/arm/probes/kprobes/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/probes/kprobes/core.c b/arch/arm/probes/kprobes/core.c index 1782b41df095..5f3c2b42787f 100644 --- a/arch/arm/probes/kprobes/core.c +++ b/arch/arm/probes/kprobes/core.c @@ -397,11 +397,13 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self, void __naked __kprobes kretprobe_trampoline(void) { __asm__ __volatile__ ( + "sub sp, sp, #16 \n\t" "stmdb sp!, {r0 - r11} \n\t" "mov r0, sp \n\t" "bl trampoline_handler \n\t" "mov lr, r0 \n\t" "ldmia sp!, {r0 - r11} \n\t" + "add sp, sp, #16 \n\t" #ifdef CONFIG_THUMB2_KERNEL "bx lr \n\t" #else