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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 2FC67C43381 for ; Fri, 22 Feb 2019 03:40:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 06A6C20818 for ; Fri, 22 Feb 2019 03:40:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726751AbfBVDkH (ORCPT ); Thu, 21 Feb 2019 22:40:07 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:4250 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726281AbfBVDkG (ORCPT ); Thu, 21 Feb 2019 22:40:06 -0500 Received: from DGGEMS404-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 0F50D39C9F91D220316; Fri, 22 Feb 2019 11:40:04 +0800 (CST) Received: from localhost (10.177.31.96) by DGGEMS404-HUB.china.huawei.com (10.3.19.204) with Microsoft SMTP Server id 14.3.408.0; Fri, 22 Feb 2019 11:39:55 +0800 From: Yue Haibing To: , , CC: , , YueHaibing Subject: [PATCH] scsi: qedi: Fix global-out-of-bounds bug in qedi dbg function Date: Fri, 22 Feb 2019 11:39:13 +0800 Message-ID: <20190222033913.12480-1-yuehaibing@huawei.com> X-Mailer: git-send-email 2.10.2.windows.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.177.31.96] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: YueHaibing KASAN report this: BUG: KASAN: global-out-of-bounds in qedi_dbg_err+0xda/0x330 [qedi] Read of size 31 at addr ffffffffc12b0ae0 by task syz-executor.0/2429 CPU: 0 PID: 2429 Comm: syz-executor.0 Not tainted 5.0.0-rc7+ #45 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xfa/0x1ce lib/dump_stack.c:113 print_address_description+0x1c4/0x270 mm/kasan/report.c:187 kasan_report+0x149/0x18d mm/kasan/report.c:317 memcpy+0x1f/0x50 mm/kasan/common.c:130 qedi_dbg_err+0xda/0x330 [qedi] ? 0xffffffffc12d0000 qedi_init+0x118/0x1000 [qedi] ? 0xffffffffc12d0000 ? 0xffffffffc12d0000 ? 0xffffffffc12d0000 do_one_initcall+0xfa/0x5ca init/main.c:887 do_init_module+0x204/0x5f6 kernel/module.c:3460 load_module+0x66b2/0x8570 kernel/module.c:3808 __do_sys_finit_module+0x238/0x2a0 kernel/module.c:3902 do_syscall_64+0x147/0x600 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x462e99 Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2d57e55c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 RAX: ffffffffffffffda RBX: 000000000073bfa0 RCX: 0000000000462e99 RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000003 RBP: 00007f2d57e55c70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2d57e566bc R13: 00000000004bcefb R14: 00000000006f7030 R15: 0000000000000004 The buggy address belongs to the variable: __func__.67584+0x0/0xffffffffffffd520 [qedi] Memory state around the buggy address: ffffffffc12b0980: fa fa fa fa 00 04 fa fa fa fa fa fa 00 00 05 fa ffffffffc12b0a00: fa fa fa fa 00 00 04 fa fa fa fa fa 00 05 fa fa >ffffffffc12b0a80: fa fa fa fa 00 06 fa fa fa fa fa fa 00 02 fa fa ^ ffffffffc12b0b00: fa fa fa fa 00 00 04 fa fa fa fa fa 00 00 03 fa ffffffffc12b0b80: fa fa fa fa 00 00 02 fa fa fa fa fa 00 00 04 fa qedi_dbg_err function does not check the length of caller's name, blindly copy 31 characters to array 'nfunc', then print it to log, which trigger global-out-of-bounds bug and may leak kernel info. Also other qedi dbg function may have the same issue, this patch fix this. Fixes: ace7f46ba5fd ("scsi: qedi: Add QLogic FastLinQ offload iSCSI driver framework.") Signed-off-by: YueHaibing --- drivers/scsi/qedi/qedi_dbg.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/qedi/qedi_dbg.c b/drivers/scsi/qedi/qedi_dbg.c index 8fd28b0..cce44b9 100644 --- a/drivers/scsi/qedi/qedi_dbg.c +++ b/drivers/scsi/qedi/qedi_dbg.c @@ -18,8 +18,7 @@ qedi_dbg_err(struct qedi_dbg_ctx *qedi, const char *func, u32 line, struct va_format vaf; char nfunc[32]; - memset(nfunc, 0, sizeof(nfunc)); - memcpy(nfunc, func, sizeof(nfunc) - 1); + snprintf(nfunc, sizeof(nfunc), "%s", func); va_start(va, fmt); @@ -43,8 +42,7 @@ qedi_dbg_warn(struct qedi_dbg_ctx *qedi, const char *func, u32 line, struct va_format vaf; char nfunc[32]; - memset(nfunc, 0, sizeof(nfunc)); - memcpy(nfunc, func, sizeof(nfunc) - 1); + snprintf(nfunc, sizeof(nfunc), "%s", func); va_start(va, fmt); @@ -72,8 +70,7 @@ qedi_dbg_notice(struct qedi_dbg_ctx *qedi, const char *func, u32 line, struct va_format vaf; char nfunc[32]; - memset(nfunc, 0, sizeof(nfunc)); - memcpy(nfunc, func, sizeof(nfunc) - 1); + snprintf(nfunc, sizeof(nfunc), "%s", func); va_start(va, fmt); @@ -102,8 +99,7 @@ qedi_dbg_info(struct qedi_dbg_ctx *qedi, const char *func, u32 line, struct va_format vaf; char nfunc[32]; - memset(nfunc, 0, sizeof(nfunc)); - memcpy(nfunc, func, sizeof(nfunc) - 1); + snprintf(nfunc, sizeof(nfunc), "%s", func); va_start(va, fmt); -- 2.7.0