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=-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=unavailable 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 407CCC43331 for ; Fri, 19 Mar 2021 12:22:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2885C64F79 for ; Fri, 19 Mar 2021 12:22:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231600AbhCSMWg (ORCPT ); Fri, 19 Mar 2021 08:22:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:33002 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231572AbhCSMWB (ORCPT ); Fri, 19 Mar 2021 08:22:01 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2F30064F77; Fri, 19 Mar 2021 12:21:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616156520; bh=cuK8J78AbxfogMJXXKkEvrxRm/eRUIxTyi0pKFZ7yKc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qcZC5/d6k6CI6oaOf1k5SHJ0CHrLtWOwdNmADHo7pziau9yuPr1gCmkFT8shu/G1V 818EU+V8a4xshg/ZYRcFFHtoJKiYoCpy0K9k6qZ+HsXlJgMNw8YkmIswSBYP2XTYSO 6zvSu/tVfEpLWbrkBsogCPXFk7mYHKLGjFZs2b92rGEvmBt8ymIhbchr0frApuMkRU zb8AwSQj/OV7rdYRAbYAAGjbOmtYKWhQcATVvCSq3uGFF2uKcfhqvKjsyDxuj8evit 4mxMzAAE4weXwYD7mP2r9mhfdzH/oi714KZfHmb57YAQ+i4j4oiMhiEsXC9MCUQRJm 57GwdSiwEwnTQ== 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 Subject: [PATCH -tip v3 01/11] ia64: kprobes: Fix to pass correct trampoline address to the handler Date: Fri, 19 Mar 2021 21:21:55 +0900 Message-Id: <161615651484.306069.13374738532116114679.stgit@devnote2> X-Mailer: git-send-email 2.25.1 In-Reply-To: <161615650355.306069.17260992641363840330.stgit@devnote2> References: <161615650355.306069.17260992641363840330.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler") missed to pass the wrong trampoline address (it passes the descriptor address instead of function entry address). This fixes it to pass correct trampoline address to __kretprobe_trampoline_handler(). This also changes to use correct symbol dereference function to get the function address from the kretprobe_trampoline. Fixes: e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler") Signed-off-by: Masami Hiramatsu --- arch/ia64/kernel/kprobes.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index fc1ff8a4d7de..006fbc1d7ae9 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -398,7 +398,8 @@ static void kretprobe_trampoline(void) int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) { - regs->cr_iip = __kretprobe_trampoline_handler(regs, kretprobe_trampoline, NULL); + regs->cr_iip = __kretprobe_trampoline_handler(regs, + dereference_function_descriptor(kretprobe_trampoline), NULL); /* * By returning a non-zero value, we are telling * kprobe_handler() that we don't want the post_handler @@ -414,7 +415,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, ri->fp = NULL; /* Replace the return addr with trampoline addr */ - regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip; + regs->b0 = (unsigned long)dereference_function_descriptor(kretprobe_trampoline); } /* Check the instruction in the slot is break */ @@ -918,14 +919,14 @@ static struct kprobe trampoline_p = { int __init arch_init_kprobes(void) { trampoline_p.addr = - (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip; + dereference_function_description(kretprobe_trampoline); return register_kprobe(&trampoline_p); } int __kprobes arch_trampoline_kprobe(struct kprobe *p) { if (p->addr == - (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip) + dereference_function_descriptor(kretprobe_trampoline)) return 1; return 0; From mboxrd@z Thu Jan 1 00:00:00 1970 From: Masami Hiramatsu Date: Fri, 19 Mar 2021 12:21:55 +0000 Subject: [PATCH -tip v3 01/11] ia64: kprobes: Fix to pass correct trampoline address to the handler Message-Id: <161615651484.306069.13374738532116114679.stgit@devnote2> List-Id: References: <161615650355.306069.17260992641363840330.stgit@devnote2> In-Reply-To: <161615650355.306069.17260992641363840330.stgit@devnote2> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 Commit e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler") missed to pass the wrong trampoline address (it passes the descriptor address instead of function entry address). This fixes it to pass correct trampoline address to __kretprobe_trampoline_handler(). This also changes to use correct symbol dereference function to get the function address from the kretprobe_trampoline. Fixes: e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler") Signed-off-by: Masami Hiramatsu --- arch/ia64/kernel/kprobes.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index fc1ff8a4d7de..006fbc1d7ae9 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -398,7 +398,8 @@ static void kretprobe_trampoline(void) int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) { - regs->cr_iip = __kretprobe_trampoline_handler(regs, kretprobe_trampoline, NULL); + regs->cr_iip = __kretprobe_trampoline_handler(regs, + dereference_function_descriptor(kretprobe_trampoline), NULL); /* * By returning a non-zero value, we are telling * kprobe_handler() that we don't want the post_handler @@ -414,7 +415,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, ri->fp = NULL; /* Replace the return addr with trampoline addr */ - regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip; + regs->b0 = (unsigned long)dereference_function_descriptor(kretprobe_trampoline); } /* Check the instruction in the slot is break */ @@ -918,14 +919,14 @@ static struct kprobe trampoline_p = { int __init arch_init_kprobes(void) { trampoline_p.addr - (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip; + dereference_function_description(kretprobe_trampoline); return register_kprobe(&trampoline_p); } int __kprobes arch_trampoline_kprobe(struct kprobe *p) { if (p->addr = - (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip) + dereference_function_descriptor(kretprobe_trampoline)) return 1; return 0;