From mboxrd@z Thu Jan 1 00:00:00 1970 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=-14.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 4B149C433E2 for ; Mon, 14 Sep 2020 17:19:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 05897217BA for ; Mon, 14 Sep 2020 17:19:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="A745HWNN"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="yxqJLe0e" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725999AbgINRTk (ORCPT ); Mon, 14 Sep 2020 13:19:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35636 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726339AbgINRQ2 (ORCPT ); Mon, 14 Sep 2020 13:16:28 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C084EC061352; Mon, 14 Sep 2020 10:16:24 -0700 (PDT) Date: Mon, 14 Sep 2020 17:16:22 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1600103783; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rlBanbMnIVXgx7swjYOyx1lC3eXsXdtk9+WqTj2pd8M=; b=A745HWNNVHGvl5LZ6TPuQ+q96hP4crmcmu+muRWFP9w6tANChXK8l8BErLSWY7AITTy/hU 73UwD6fPdGzWmoLAwFk9xrEcPfw3n5ZcqxMivZNolB2dclTBMK6Z+zfxlWrAQCjOu3KSwb SQ58WAd3RwbmdBYx+uSuH0DVJc9Hiw1A29281BTl/5TkEbbHVvICgq41vC8GF+bhML84/G c9ZxRMiPbkXcU2J2nCJpb2KqjnbMtPvfsSFkjGRzGuXGQebW9+/XfhvygR5/WZ1k5uYhAB QCXZgGiva/v5ewky+SK/M+InD/tMV/fSFFWJpp5Mjhh1FNAvbCrM3N43AUXy8A== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1600103783; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rlBanbMnIVXgx7swjYOyx1lC3eXsXdtk9+WqTj2pd8M=; b=yxqJLe0escD8CBU6+E1pndbFT9XJF/zfdp5v3uq6QoXLb531oZAGom0Wi7p0DdQ1eAKgWz AP+wHuksgZUtcNCg== From: "tip-bot2 for Masami Hiramatsu" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: perf/kprobes] arm: kprobes: Use generic kretprobe trampoline handler Cc: Masami Hiramatsu , Ingo Molnar , x86 , LKML In-Reply-To: <159870602406.1229682.10496730247473708592.stgit@devnote2> References: <159870602406.1229682.10496730247473708592.stgit@devnote2> MIME-Version: 1.0 Message-ID: <160010378260.15536.6528187294460469042.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the perf/kprobes branch of tip: Commit-ID: 94509582d1d173c4777b8832ecbac6dff2ccbfa7 Gitweb: https://git.kernel.org/tip/94509582d1d173c4777b8832ecbac6dff2ccbfa7 Author: Masami Hiramatsu AuthorDate: Sat, 29 Aug 2020 22:00:24 +09:00 Committer: Ingo Molnar CommitterDate: Tue, 08 Sep 2020 11:52:32 +02:00 arm: kprobes: Use generic kretprobe trampoline handler Use the generic kretprobe trampoline handler. Use regs->ARM_fp for framepointer verification. Signed-off-by: Masami Hiramatsu Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/159870602406.1229682.10496730247473708592.stgit@devnote2 --- arch/arm/probes/kprobes/core.c | 78 +-------------------------------- 1 file changed, 3 insertions(+), 75 deletions(-) diff --git a/arch/arm/probes/kprobes/core.c b/arch/arm/probes/kprobes/core.c index feefa20..a965311 100644 --- a/arch/arm/probes/kprobes/core.c +++ b/arch/arm/probes/kprobes/core.c @@ -413,87 +413,15 @@ void __naked __kprobes kretprobe_trampoline(void) /* Called from kretprobe_trampoline */ static __used __kprobes void *trampoline_handler(struct pt_regs *regs) { - struct kretprobe_instance *ri = NULL; - struct hlist_head *head, empty_rp; - struct hlist_node *tmp; - unsigned long flags, orig_ret_address = 0; - unsigned long trampoline_address = (unsigned long)&kretprobe_trampoline; - kprobe_opcode_t *correct_ret_addr = NULL; - - INIT_HLIST_HEAD(&empty_rp); - kretprobe_hash_lock(current, &head, &flags); - - /* - * It is possible to have multiple instances associated with a given - * task either because multiple functions in the call path have - * a return probe installed on them, and/or more than one return - * probe was registered for a target function. - * - * We can handle this because: - * - instances are always inserted at the head of the list - * - when multiple return probes are registered for the same - * function, the first instance's ret_addr will point to the - * real return address, and all the rest will point to - * kretprobe_trampoline - */ - hlist_for_each_entry_safe(ri, tmp, head, hlist) { - if (ri->task != current) - /* another task is sharing our hash bucket */ - continue; - - orig_ret_address = (unsigned long)ri->ret_addr; - - if (orig_ret_address != trampoline_address) - /* - * This is the real return address. Any other - * instances associated with this task are for - * other calls deeper on the call stack - */ - break; - } - - kretprobe_assert(ri, orig_ret_address, trampoline_address); - - correct_ret_addr = ri->ret_addr; - hlist_for_each_entry_safe(ri, tmp, head, hlist) { - if (ri->task != current) - /* another task is sharing our hash bucket */ - continue; - - orig_ret_address = (unsigned long)ri->ret_addr; - if (ri->rp && ri->rp->handler) { - __this_cpu_write(current_kprobe, &ri->rp->kp); - get_kprobe_ctlblk()->kprobe_status = KPROBE_HIT_ACTIVE; - ri->ret_addr = correct_ret_addr; - ri->rp->handler(ri, regs); - __this_cpu_write(current_kprobe, NULL); - } - - recycle_rp_inst(ri, &empty_rp); - - if (orig_ret_address != trampoline_address) - /* - * This is the real return address. Any other - * instances associated with this task are for - * other calls deeper on the call stack - */ - break; - } - - kretprobe_hash_unlock(current, &flags); - - hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) { - hlist_del(&ri->hlist); - kfree(ri); - } - - return (void *)orig_ret_address; + return (void *)kretprobe_trampoline_handler(regs, &kretprobe_trampoline, + (void *)regs->ARM_fp); } void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) { ri->ret_addr = (kprobe_opcode_t *)regs->ARM_lr; + ri->fp = (void *)regs->ARM_fp; /* Replace the return addr with trampoline addr. */ regs->ARM_lr = (unsigned long)&kretprobe_trampoline;