From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 687CC1FA2 for ; Thu, 21 Apr 2022 08:37:25 +0000 (UTC) Received: by mail-io1-f69.google.com with SMTP id x8-20020a056602160800b00654b3a46b66so2816378iow.19 for ; Thu, 21 Apr 2022 01:37:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=Z3COjImbkOiEoOAzeO8GIdxDewk8AQvlhTEHNm0MlOw=; b=j2c5HHkQHjQztIu+nkPNT9GuwqRGzatEOQE8kLV5TuIxjj27+KOIWFlRdoc2DEzSkK 0N4HwgkCpjOriqv4ZRiB7uYNu5W+3qDSxq05uHK1a0PIKcd1MDrEUWo9fPriyaWac29u Pfj24+G/MvCxWSFgprnKeeI0qT8Fa3o5t7wWU83HKoW0YkETO4rXa33HiQR4OLZLZNAy h/7l39zyb106rCDGK47HHrdJegMTulM84fGdV3NTg9SrKChVDbYwVWIB/lIMNyPDN/Zs jo2LCeVTPJCrPtOOCaF5xqjqKlKk6DAY5FIWb+QTZNqon4m6OJm1RROtuo0sCspoxk10 Nexw== X-Gm-Message-State: AOAM533xlNAlFf4t1OsTUDXrJ6V3MPCr/rlXxRXMyxLCNMs2sb/CdG0T rMLUa8A1hqHkD7vJiG8E+8suIzaaQXU2Z963rc+rjlMC7cGi X-Google-Smtp-Source: ABdhPJwl3/XXfAKfEcos1SazqUljVxiPCxXMPwsY8wSp6dJPzIeZNsFQ2CEKPoASmEbz3qZzqC7Y3N4nsJfiwq7n40kifY7eBpdV Precedence: bulk X-Mailing-List: ntfs3@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1bc7:b0:2cc:5965:ea80 with SMTP id x7-20020a056e021bc700b002cc5965ea80mr3176767ilv.221.1650530244546; Thu, 21 Apr 2022 01:37:24 -0700 (PDT) Date: Thu, 21 Apr 2022 01:37:24 -0700 In-Reply-To: <000000000000f8b5ef05dd25b963@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ead34405dd2604f0@google.com> Subject: Re: [syzbot] UBSAN: shift-out-of-bounds in ntfs_fill_super From: syzbot To: almaz.alexandrovich@paragon-software.com, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, nathan@kernel.org, ndesaulniers@google.com, ntfs3@lists.linux.dev, syzkaller-bugs@googlegroups.com, trix@redhat.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: b253435746d9 Merge tag 'xtensa-20220416' of https://github.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=177e30e8f00000 kernel config: https://syzkaller.appspot.com/x/.config?x=ff9f8140cbb3af7 dashboard link: https://syzkaller.appspot.com/bug?extid=1631f09646bc214d2e76 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=12e13cfcf00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=135e3008f00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1631f09646bc214d2e76@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 8189 ================================================================================ UBSAN: shift-out-of-bounds in fs/ntfs3/super.c:673:16 shift exponent -192 is negative CPU: 1 PID: 3587 Comm: syz-executor611 Not tainted 5.18.0-rc3-syzkaller-00016-gb253435746d9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 ubsan_epilogue+0xb/0x50 lib/ubsan.c:151 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x187 lib/ubsan.c:322 ntfs_fill_super.cold+0x2bf/0x549 fs/ntfs/bitmap.c:84 get_tree_bdev+0x440/0x760 fs/super.c:1292 vfs_get_tree+0x89/0x2f0 fs/super.c:1497 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1320/0x1fa0 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 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+0x44/0xae RIP: 0033:0x7fb8d7bcd7ea Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 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:00007ffdfb6d7948 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffdfb6d79a0 RCX: 00007fb8d7bcd7ea RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffdfb6d7960 RBP: 00007ffdfb6d7960 R08: 00007ffdfb6d79a0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 0000000020001b80 R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000110 ================================================================================