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 DF216C433E2 for ; Mon, 14 Sep 2020 17:18:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9BE52206B7 for ; Mon, 14 Sep 2020 17:18:11 +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="a+Ek0K8G"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Y/B3m56R" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726162AbgINRRu (ORCPT ); Mon, 14 Sep 2020 13:17:50 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:34844 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725978AbgINRQZ (ORCPT ); Mon, 14 Sep 2020 13:16:25 -0400 Date: Mon, 14 Sep 2020 17:16:19 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1600103780; 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=Tyv+pYPSvqz2+r6mgqlrV3DT7i0c+lUUBJhCy9/1LFk=; b=a+Ek0K8GYxldhpz6isIB/HKilL5Abb2jsnMKnNwvzPauBuOUUAyNgCasq0pSRwZobEZGtm QJuQoi+J4vuFmD2zviR0aHn64N5DkTWkwtaQEgXdDKxVsFnrdj0Eg+uGUwel4P5E6LJG8U mPEOQQh0C6+bBz7BZN1nTCRzMzBQjYBsAwBfEZOgkBQCn1kXThmBpjILg+mzlcnAMyzE2h t1EebgbdTBtJYRXb71UDofhR2WOFsyb1sbVb7qosxsyut8Nt1D1yZEOWCmTX+TmaGYeUzc DVkp/Tdir1AjclzhTVee0JdM+nZ6MO/0iyjar02rANq20VIbeQHunpx8XriQQg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1600103780; 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=Tyv+pYPSvqz2+r6mgqlrV3DT7i0c+lUUBJhCy9/1LFk=; b=Y/B3m56RxaP7nlFjzeSuxmhZBgLaDiTT5B1+TGuYMy50WJSvk6zzoMVPAaSH+9YBgLM+8K v5QZMGf4N2E3BVCA== From: "tip-bot2 for Masami Hiramatsu" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: perf/kprobes] ia64: kprobes: Use generic kretprobe trampoline handler Cc: Masami Hiramatsu , Ingo Molnar , x86 , LKML In-Reply-To: <159870606883.1229682.12331813108378725668.stgit@devnote2> References: <159870606883.1229682.12331813108378725668.stgit@devnote2> MIME-Version: 1.0 Message-ID: <160010377958.15536.15628800320542363117.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: e792ff804f49720ce003b3e4c618b5d996256a18 Gitweb: https://git.kernel.org/tip/e792ff804f49720ce003b3e4c618b5d996256a18 Author: Masami Hiramatsu AuthorDate: Sat, 29 Aug 2020 22:01:09 +09:00 Committer: Ingo Molnar CommitterDate: Tue, 08 Sep 2020 11:52:33 +02:00 ia64: kprobes: Use generic kretprobe trampoline handler Use the generic kretprobe trampoline handler. Don't use framepointer verification. Signed-off-by: Masami Hiramatsu Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/159870606883.1229682.12331813108378725668.stgit@devnote2 --- arch/ia64/kernel/kprobes.c | 77 +------------------------------------- 1 file changed, 2 insertions(+), 75 deletions(-) diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index 7a7df94..fc1ff8a 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -396,83 +396,9 @@ static void kretprobe_trampoline(void) { } -/* - * At this point the target function has been tricked into - * returning into our trampoline. Lookup the associated instance - * and then: - * - call the handler function - * - cleanup by marking the instance as unused - * - long jump back to the original return address - */ int __kprobes trampoline_probe_handler(struct kprobe *p, 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 = - ((struct fnptr *)kretprobe_trampoline)->ip; - - 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 an multiple functions in the call path - * have a return probe installed on them, and/or more than one return - * 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; - } - - regs->cr_iip = orig_ret_address; - - hlist_for_each_entry_safe(ri, tmp, head, hlist) { - if (ri->task != current) - /* another task is sharing our hash bucket */ - continue; - - if (ri->rp && ri->rp->handler) - ri->rp->handler(ri, regs); - - orig_ret_address = (unsigned long)ri->ret_addr; - 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_assert(ri, orig_ret_address, trampoline_address); - - kretprobe_hash_unlock(current, &flags); - - hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) { - hlist_del(&ri->hlist); - kfree(ri); - } + regs->cr_iip = __kretprobe_trampoline_handler(regs, kretprobe_trampoline, NULL); /* * By returning a non-zero value, we are telling * kprobe_handler() that we don't want the post_handler @@ -485,6 +411,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs) { ri->ret_addr = (kprobe_opcode_t *)regs->b0; + ri->fp = NULL; /* Replace the return addr with trampoline addr */ regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip;