From patchwork Sat Sep 24 07:10:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hawkins Jiawei X-Patchwork-Id: 12987426 X-Patchwork-Delegate: kuba@kernel.org 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 3A904C32771 for ; Sat, 24 Sep 2022 07:10:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233034AbiIXHKp (ORCPT ); Sat, 24 Sep 2022 03:10:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229573AbiIXHKn (ORCPT ); Sat, 24 Sep 2022 03:10:43 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 76D9E1CB3F; Sat, 24 Sep 2022 00:10:41 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id x1-20020a17090ab00100b001fda21bbc90so7841774pjq.3; Sat, 24 Sep 2022 00:10:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=FaItmNqhDMrMvhbcRiW1uCPA8I9uLnSQvUBwJZ5pGC4=; b=fYKX+Wy9d3k12vldvHQUFzkxZK/bfFBauGrZTvC1HHMiSy/tJqHjNj+/F766WrP8TY SrOfi+ffQQE61ZrnxKQxTmUG0EIHHU8Nyu3vQRlXZ9d3h+sdXuGFBKyr1Ol3d9yu6GuO XM16FmiqSQ32wPFp6dnQWSuHmJL6YeymKJBTob9IFDTrrDMer+/eJxhjcZlHaLX4fuiw JR9VMSa1bu6A9Bnc8Fs1w9eaZlQXH9k3eNxTt84eF3+Sjz4PO1K1a65kKDVK4YH6fwp9 rNockZ6sN3tGVNbCcZQH0xfD0b6tlkOHCRjHsrfDJMLKwg9bS+2xuRjkjCSWzxMyEcji ubzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=FaItmNqhDMrMvhbcRiW1uCPA8I9uLnSQvUBwJZ5pGC4=; b=kwUKN58x2teRYdZCdgiVdIQMvI3jGRSw3lvyZr0XVZm+8kvlCvIo3qO8PPzL+SsqTJ 90NsKL/Z70O8KBWIUXSb6tkC1VmoGvtSRP09vtAQwMyUvO/Ot5gdk0iOda3aZ71uuQv5 GQGkFsgwQy1ktmebZuwGU8IIEeC22sEq6RtqC7SvAoNYeZ2bFp+s77ewB6HoH2QpzTvz +tN9jgHoqmLH8gc/uAjYp0Sq+niqgxT2eqaYvR7AyE9F6w6UU5Kt3FYflzjX1gnMatgT mKImPIVxXlSvJuyzvtUAS1XVICTuDLbzdb6YtQ4zaTmvrS9mmLuso3eY6PjnuFLoR4b8 Rh3Q== X-Gm-Message-State: ACrzQf2jPK3lRKokPdRw3V10hRCObrImUQ+jt6hW0bHNf7LejSVUO+zC c13RriDiYpjOJ/ZPaegz4MU= X-Google-Smtp-Source: AMsMyM44xfDjWDbw4KI2pTdPtpXEnPPDPTiBWLf3K5Gg1LVSPzHmCN/IohowjFOOLc5wfrFAqx0lFw== X-Received: by 2002:a17:90b:384b:b0:200:71b8:ae00 with SMTP id nl11-20020a17090b384b00b0020071b8ae00mr24858747pjb.125.1664003440925; Sat, 24 Sep 2022 00:10:40 -0700 (PDT) Received: from localhost ([36.112.206.177]) by smtp.gmail.com with ESMTPSA id g3-20020a17090a300300b0020379616053sm2653020pjb.57.2022.09.24.00.10.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 24 Sep 2022 00:10:40 -0700 (PDT) From: Hawkins Jiawei To: syzbot+473754e5af963cf014cf@syzkaller.appspotmail.com, Johannes Berg , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, 18801353760@163.com, yin31149@gmail.com, keescook@chromium.org, Stephen Rothwell Subject: [PATCH] Add linux-next specific files for 20220923 Date: Sat, 24 Sep 2022 15:10:34 +0800 Message-Id: <20220924071035.16027-1-yin31149@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <00000000000070db2005e95a5984@google.com> References: <00000000000070db2005e95a5984@google.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Stephen Rothwell > Hello, > > syzbot found the following issue on: > > HEAD commit: 483fed3b5dc8 Add linux-next specific files for 20220921 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=1154ddd5080000 > kernel config: https://syzkaller.appspot.com/x/.config?x=849cb9f70f15b1ba > dashboard link: https://syzkaller.appspot.com/bug?extid=473754e5af963cf014cf > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=157c196f080000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11f12618880000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/1cb3f4618323/disk-483fed3b.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/cc02cb30b495/vmlinux-483fed3b.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+473754e5af963cf014cf@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > memcpy: detected field-spanning write (size 8) of single field "&compat_event->pointer" at net/wireless/wext-core.c:623 (size 4) > WARNING: CPU: 0 PID: 3607 at net/wireless/wext-core.c:623 wireless_send_event+0xab5/0xca0 net/wireless/wext-core.c:623 > Modules linked in: > CPU: 1 PID: 3607 Comm: syz-executor659 Not tainted 6.0.0-rc6-next-20220921-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2022 > RIP: 0010:wireless_send_event+0xab5/0xca0 net/wireless/wext-core.c:623 > Code: fa ff ff e8 cd b9 db f8 b9 04 00 00 00 4c 89 e6 48 c7 c2 e0 56 11 8b 48 c7 c7 20 56 11 8b c6 05 94 8e 2a 05 01 e8 b8 b0 a6 00 <0f> 0b e9 9b fa ff ff e8 6f ef 27 f9 e9 a6 fd ff ff e8 c5 ef 27 f9 > RSP: 0018:ffffc90003b2fbc0 EFLAGS: 00010286 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: ffff888021d157c0 RSI: ffffffff81620348 RDI: fffff52000765f6a > RBP: ffff88801e15c780 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000080000000 R11: 20676e696e6e6170 R12: 0000000000000008 > R13: ffff888025a72640 R14: ffff8880225d402c R15: ffff8880225d4034 > FS: 0000555556bd9300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fbda677dfb8 CR3: 000000007b976000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > ioctl_standard_call+0x155/0x1f0 net/wireless/wext-core.c:1022 > wireless_process_ioctl+0xc8/0x4c0 net/wireless/wext-core.c:955 > wext_ioctl_dispatch net/wireless/wext-core.c:988 [inline] > wext_ioctl_dispatch net/wireless/wext-core.c:976 [inline] > wext_handle_ioctl+0x26b/0x280 net/wireless/wext-core.c:1049 > sock_ioctl+0x285/0x640 net/socket.c:1220 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:870 [inline] > __se_sys_ioctl fs/ioctl.c:856 [inline] > __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7fbda6736af9 > Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffd45e80138 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbda6736af9 > RDX: 0000000020000000 RSI: 0000000000008b04 RDI: 0000000000000003 > RBP: 00007fbda66faca0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbda66fad30 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > I think this is the samiliar problem as what Kees Cook pointed out in https://lore.kernel.org/linux-next/202209211250.3049C29@keescook/ It seems that memcpy() will performs run-time buffer bounds checking, which triggers this warning. #syz test git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master diff --git a/include/linux/wireless.h b/include/linux/wireless.h index 2d1b54556eff..81603848b0aa 100644 --- a/include/linux/wireless.h +++ b/include/linux/wireless.h @@ -26,7 +26,10 @@ struct compat_iw_point { struct __compat_iw_event { __u16 len; /* Real length of this stuff */ __u16 cmd; /* Wireless IOCTL */ - compat_caddr_t pointer; + union { + compat_caddr_t pointer; + __DECLARE_FLEX_ARRAY(__u8, pointer_flex); + }; }; #define IW_EV_COMPAT_LCP_LEN offsetof(struct __compat_iw_event, pointer) #define IW_EV_COMPAT_POINT_OFF offsetof(struct compat_iw_point, length) diff --git a/net/wireless/wext-core.c b/net/wireless/wext-core.c index 76a80a41615b..9d0b50abbe09 100644 --- a/net/wireless/wext-core.c +++ b/net/wireless/wext-core.c @@ -620,7 +620,7 @@ void wireless_send_event(struct net_device * dev, extra, extra_len); } else { /* extra_len must be zero, so no if (extra) needed */ - memcpy(&compat_event->pointer, wrqu, + memcpy(&compat_event->pointer_flex, wrqu, hdr_len - IW_EV_COMPAT_LCP_LEN); }