Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 090FBC433EF for ; Wed, 24 Nov 2021 12:52:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344516AbhKXMzq (ORCPT ); Wed, 24 Nov 2021 07:55:46 -0500 Received: from mail.kernel.org ([198.145.29.99]:59184 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346252AbhKXMxL (ORCPT ); Wed, 24 Nov 2021 07:53:11 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6A209615A2; Wed, 24 Nov 2021 12:30:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637757055; bh=3YiSKpf1WxHlwdfjiCvYeBvvwlM1oFwcd5UryWBJ7EY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X8aYbNIDi0dVo5TM6cMYxnmXIoa0BEhjhFEx3oHJXJSkNaaN2Y8kcPjFalZcnCzR1 KuPT1sF3u8/lphwI4KsaiS0QeuzLGUjoZyoqq7qqvFot96Td2HgoD+nefEBUkVRaRo PbMLznWpeZYKaRV3X2+oCgVmtOdx2RhUOztNxEZs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Josh Poimboeuf , Ingo Molnar , X86 ML , Daniel Xu , Thomas Gleixner , Borislav Petkov , Peter Zijlstra , Abhishek Sagar , Andrii Nakryiko , Paul McKenney , Masami Hiramatsu , "Steven Rostedt (VMware)" Subject: [PATCH 4.19 041/323] ia64: kprobes: Fix to pass correct trampoline address to the handler Date: Wed, 24 Nov 2021 12:53:51 +0100 Message-Id: <20211124115720.259123470@linuxfoundation.org> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211124115718.822024889@linuxfoundation.org> References: <20211124115718.822024889@linuxfoundation.org> User-Agent: quilt/0.66 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 From: Masami Hiramatsu commit a7fe2378454cf46cd5e2776d05e72bbe8f0a468c upstream. The following commit: Commit e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler") Passed the wrong trampoline address to __kretprobe_trampoline_handler(): it passes the descriptor address instead of function entry address. Pass the right parameter. Also use correct symbol dereference function to get the function address from 'kretprobe_trampoline' - an IA64 special. Link: https://lkml.kernel.org/r/163163042696.489837.12551102356265354730.stgit@devnote2 Fixes: e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler") Cc: Josh Poimboeuf Cc: Ingo Molnar Cc: X86 ML Cc: Daniel Xu Cc: Thomas Gleixner Cc: Borislav Petkov Cc: Peter Zijlstra Cc: Abhishek Sagar Cc: Andrii Nakryiko Cc: Paul McKenney Cc: stable@vger.kernel.org Signed-off-by: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Greg Kroah-Hartman --- arch/ia64/kernel/kprobes.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -411,7 +411,8 @@ 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 @@ -427,7 +428,7 @@ void __kprobes arch_prepare_kretprobe(st 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 */ @@ -957,14 +958,14 @@ static struct kprobe trampoline_p = { int __init arch_init_kprobes(void) { trampoline_p.addr = - (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip; + dereference_function_descriptor(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;