Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754710AbeAMHRI (ORCPT + 1 other); Sat, 13 Jan 2018 02:17:08 -0500 Received: from mail-pl0-f67.google.com ([209.85.160.67]:39031 "EHLO mail-pl0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751629AbeAMHRH (ORCPT ); Sat, 13 Jan 2018 02:17:07 -0500 X-Google-Smtp-Source: ACJfBoudavZ4k/gpKd9Z5qmYmKFcdAW6rRqqYfegz9dPq/L4PXrN2PLsYUBi2hsZxLshG7gBQ9ZSio9nAIC5N/Gqfzg= MIME-Version: 1.0 In-Reply-To: <94eb2c06de30df3d1605626b941b@google.com> References: <94eb2c06de30df3d1605626b941b@google.com> From: Dmitry Vyukov Date: Sat, 13 Jan 2018 08:16:45 +0100 Message-ID: Subject: Re: general protection fault in __bpf_map_put To: syzbot Cc: Alexei Starovoitov , Daniel Borkmann , LKML , netdev , syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On Wed, Jan 10, 2018 at 1:58 PM, syzbot wrote: > Hello, > > syzkaller hit the following crash on > b4464bcab38d3f7fe995a7cb960eeac6889bec08 > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > C reproducer is attached > syzkaller reproducer is attached. See https://goo.gl/kgGztJ > for information about syzkaller reproducers > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+d2f5524fb46fd3b312ee@syzkaller.appspotmail.com > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. Daniel, is it the same bug that was fixed by "bpf, array: fix overflow in max_entries and undefined behavior in index_mask"? > audit: type=1400 audit(1515571663.627:11): avc: denied { map_read > map_write } for pid=3537 comm="syzkaller597104" > scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 > tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf > permissive=1 > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] SMP KASAN > Dumping ftrace buffer: > (ftrace buffer empty) > Modules linked in: > CPU: 1 PID: 23 Comm: kworker/1:1 Not tainted 4.15.0-rc7-next-20180110+ #93 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: events bpf_map_free_deferred > RIP: 0010:__bpf_map_put+0x64/0x2e0 kernel/bpf/syscall.c:233 > RSP: 0018:ffff8801d98b7458 EFLAGS: 00010293 > RAX: ffff8801d98ac600 RBX: ad6001bc00000dd1 RCX: ffffffff817e4454 > RDX: 0000000000000000 RSI: 0000000000000001 RDI: ad6001bc00000dd1 > RBP: ffff8801d98b74e8 R08: 1ffff1003b316e6a R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1003b316e8c > R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000001 > FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000204f9fe4 CR3: 0000000006822003 CR4: 00000000001606e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > bpf_map_put+0x1a/0x20 kernel/bpf/syscall.c:243 > bpf_map_fd_put_ptr+0x15/0x20 kernel/bpf/map_in_map.c:96 > fd_array_map_delete_elem kernel/bpf/arraymap.c:420 [inline] > bpf_fd_array_map_clear kernel/bpf/arraymap.c:461 [inline] > array_of_map_free+0x100/0x180 kernel/bpf/arraymap.c:618 > bpf_map_free_deferred+0xb0/0xe0 kernel/bpf/syscall.c:217 > process_one_work+0xbbf/0x1af0 kernel/workqueue.c:2112 > worker_thread+0x223/0x1990 kernel/workqueue.c:2246 > kthread+0x33c/0x400 kernel/kthread.c:238 > ret_from_fork+0x4b/0x60 arch/x86/entry/entry_64.S:547 > Code: b5 41 48 c7 45 80 1d 2c 59 86 48 c7 45 88 f0 43 7e 81 c7 00 f1 f1 f1 > f1 c7 40 04 00 f2 f2 f2 c7 40 08 f3 f3 f3 f3 e8 9c 1e f2 ff ff 4b 48 74 > 2f e8 91 1e f2 ff 48 b8 00 00 00 00 00 fc ff df > RIP: __bpf_map_put+0x64/0x2e0 kernel/bpf/syscall.c:233 RSP: ffff8801d98b7458 > ---[ end trace 61592f27aaa1e096 ]--- > Kernel panic - not syncing: Fatal exception > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@googlegroups.com. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > If you want to test a patch for this bug, please reply with: > #syz test: git://repo/address.git branch > and provide the patch inline or as an attachment. > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/94eb2c06de30df3d1605626b941b%40google.com. > For more options, visit https://groups.google.com/d/optout.