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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 7AACEC2BA2B for ; Thu, 16 Apr 2020 07:05:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 608A920771 for ; Thu, 16 Apr 2020 07:05:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2438362AbgDPHFc (ORCPT ); Thu, 16 Apr 2020 03:05:32 -0400 Received: from mail-il1-f198.google.com ([209.85.166.198]:41121 "EHLO mail-il1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2437900AbgDPHFQ (ORCPT ); Thu, 16 Apr 2020 03:05:16 -0400 Received: by mail-il1-f198.google.com with SMTP id y2so8067376ilm.8 for ; Thu, 16 Apr 2020 00:05:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=TVvBVOi41Qo7r/+UOsEfQG1z/YRIhNfOcDF384KFc24=; b=c6bYfO7RvGBDUF7dBjxidLq2WwdJ+oDdFedCUOtQm8jugd0ESrZZwKvCTHvt5/Yip6 xZmxYLOI2YgvR81yrqJRNVB2YNtsQCh5r37dHbEHT1i3nzXLLKq7ZlGhxxzbi2PBm/0l YS9YC1A710Nid5VfkxxFNsF5uV/Cg0Zljjp9NYd9GdEue6KEQtAU8Hgts6GlvqGiM++t w6OcGaKRHCjwoPR/HgH7SRKcp8SyyiOSZgAuK/XJ71G4ldhsKD4yKzlxq+ZMGZfN8VjD CFY5FREf0MAg7d8o1+1QTigQRHt28CGFFsRWn6oSkRbs6GCig9xzGaRtfiVuGowsS/BD ylcA== X-Gm-Message-State: AGi0PuarG0Bv5zkER8uT8dKDvjP7EDou9s/8zqIsLTj2OshiVuoSMpyg HhnyjbR16QFeaPEucakzXSGjxfcerjy3mJQm5vftKDol7RCJ X-Google-Smtp-Source: APiQypKBqNDHPOkuF+tpw9qAi5DbjodJ5a9xwXABXAyXw6VezRclbW19E1SSkdh9CYCb+KnhaYXF/crHs7oo6yopYcjrft2QOZu3 MIME-Version: 1.0 X-Received: by 2002:a6b:7203:: with SMTP id n3mr16253379ioc.23.1587020714552; Thu, 16 Apr 2020 00:05:14 -0700 (PDT) Date: Thu, 16 Apr 2020 00:05:14 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f1377e05a3630d32@google.com> Subject: KMSAN: uninit-value in sctp_ootb_pkt_new From: syzbot To: davem@davemloft.net, glider@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, syzkaller-bugs@googlegroups.com, vyasevich@gmail.com Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 75303409 kmsan: dma: call KMSAN hooks for DMA mappings whe.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=11d2f9e7e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7811db4cc444a7f6 dashboard link: https://syzkaller.appspot.com/bug?extid=6751381fe5a26df5b74d compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6751381fe5a26df5b74d@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline] BUG: KMSAN: uninit-value in __fswab32 include/uapi/linux/swab.h:60 [inline] BUG: KMSAN: uninit-value in sctp_ootb_pkt_new+0x202/0x540 net/sctp/sm_statefuns.c:6256 CPU: 0 PID: 20127 Comm: syz-executor.2 Not tainted 5.6.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline] __fswab32 include/uapi/linux/swab.h:60 [inline] sctp_ootb_pkt_new+0x202/0x540 net/sctp/sm_statefuns.c:6256 sctp_sf_tabort_8_4_8+0xe6/0x7e0 net/sctp/sm_statefuns.c:3372 sctp_sf_do_5_1B_init+0x6be/0x1b60 net/sctp/sm_statefuns.c:338 sctp_do_sm+0x2b4/0x9a30 net/sctp/sm_sideeffect.c:1153 sctp_endpoint_bh_rcv+0xd54/0xfe0 net/sctp/endpointola.c:395 sctp_inq_push+0x300/0x420 net/sctp/inqueue.c:80 sctp_rcv+0x48b9/0x5410 net/sctp/input.c:256 ip_protocol_deliver_rcu+0x700/0xbc0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish net/ipv4/ip_input.c:428 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0x6cf/0x750 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core net/core/dev.c:5187 [inline] __netif_receive_skb net/core/dev.c:5301 [inline] netif_receive_skb_internal net/core/dev.c:5391 [inline] netif_receive_skb+0xbb5/0xf20 net/core/dev.c:5450 tun_rx_batched include/linux/skbuff.h:4351 [inline] tun_get_user+0x6aef/0x6f60 drivers/net/tun.c:1997 tun_chr_write_iter+0x1f2/0x360 drivers/net/tun.c:2026 call_write_iter include/linux/fs.h:1902 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0xa5a/0xca0 fs/read_write.c:496 vfs_write+0x44a/0x8f0 fs/read_write.c:558 ksys_write+0x267/0x450 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:620 __x64_sys_write+0x4a/0x70 fs/read_write.c:620 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c889 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f973b07dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f973b07e6d4 RCX: 000000000045c889 RDX: 000000000000002e RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000d0d R14: 00000000004cf3b9 R15: 000000000076bf0c Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:82 slab_alloc_node mm/slub.c:2801 [inline] __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4420 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1081 [inline] alloc_skb_with_frags+0x18c/0xa70 net/core/skbuff.c:5764 sock_alloc_send_pskb+0xada/0xc60 net/core/sock.c:2245 tun_alloc_skb drivers/net/tun.c:1529 [inline] tun_get_user+0x10ae/0x6f60 drivers/net/tun.c:1843 tun_chr_write_iter+0x1f2/0x360 drivers/net/tun.c:2026 call_write_iter include/linux/fs.h:1902 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0xa5a/0xca0 fs/read_write.c:496 vfs_write+0x44a/0x8f0 fs/read_write.c:558 ksys_write+0x267/0x450 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:620 __x64_sys_write+0x4a/0x70 fs/read_write.c:620 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ===================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.