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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24CE2C761AF for ; Mon, 3 Apr 2023 14:35:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233032AbjDCOfQ (ORCPT ); Mon, 3 Apr 2023 10:35:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233632AbjDCOfL (ORCPT ); Mon, 3 Apr 2023 10:35:11 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A3F3E44 for ; Mon, 3 Apr 2023 07:35:01 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 164E8CE12DD for ; Mon, 3 Apr 2023 14:34:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E861C433EF; Mon, 3 Apr 2023 14:34:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680532489; bh=8fDpWdDJed4wWXQJ1uiE+mQNg9rYkBy9GbITTi0wzBY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hywl6dBWSnouvAfjStKemVZeK3aNGngOXNvN8gVbyHQbC969bWzoryZsoRr/tFMdO r532uNhRtJK/Soh40ySx3ONDzIWIUJniErdkGRFIoI7Uy4SnWINNzmnSNOrrs6RpQu B72RIqJ7eKBDemIvs/7FMhlMx9ykVXruMYkigsik= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Max Filippov Subject: [PATCH 5.15 84/99] xtensa: fix KASAN report for show_stack Date: Mon, 3 Apr 2023 16:09:47 +0200 Message-Id: <20230403140406.558075369@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140356.079638751@linuxfoundation.org> References: <20230403140356.079638751@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Max Filippov commit 1d3b7a788ca7435156809a6bd5b20c95b2370d45 upstream. show_stack dumps raw stack contents which may trigger an unnecessary KASAN report. Fix it by copying stack contents to a temporary buffer with __memcpy and then printing that buffer instead of passing stack pointer directly to the print_hex_dump. Cc: stable@vger.kernel.org Signed-off-by: Max Filippov Signed-off-by: Greg Kroah-Hartman --- arch/xtensa/kernel/traps.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) --- a/arch/xtensa/kernel/traps.c +++ b/arch/xtensa/kernel/traps.c @@ -510,7 +510,7 @@ static size_t kstack_depth_to_print = CO void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl) { - size_t len; + size_t len, off = 0; if (!sp) sp = stack_pointer(task); @@ -519,9 +519,17 @@ void show_stack(struct task_struct *task kstack_depth_to_print * STACK_DUMP_ENTRY_SIZE); printk("%sStack:\n", loglvl); - print_hex_dump(loglvl, " ", DUMP_PREFIX_NONE, - STACK_DUMP_LINE_SIZE, STACK_DUMP_ENTRY_SIZE, - sp, len, false); + while (off < len) { + u8 line[STACK_DUMP_LINE_SIZE]; + size_t line_len = len - off > STACK_DUMP_LINE_SIZE ? + STACK_DUMP_LINE_SIZE : len - off; + + __memcpy(line, (u8 *)sp + off, line_len); + print_hex_dump(loglvl, " ", DUMP_PREFIX_NONE, + STACK_DUMP_LINE_SIZE, STACK_DUMP_ENTRY_SIZE, + line, line_len, false); + off += STACK_DUMP_LINE_SIZE; + } show_trace(task, sp, loglvl); }