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Date: Thu, 14 Feb 2019 21:38:02 -0800 From: syzbot <syzbot+55de1eb4975dec156d8f@...kaller.appspotmail.com> To: arve@...roid.com, christian@...uner.io, devel@...verdev.osuosl.org, dvyukov@...gle.com, gregkh@...uxfoundation.org, joel@...lfernandes.org, kernel-team@...roid.com, linux-kernel@...r.kernel.org, maco@...roid.com, maco@...gle.com, syzkaller-bugs@...glegroups.com, tkjos@...roid.com, tkjos@...gle.com Subject: Re: kernel BUG at drivers/android/binder_alloc.c:LINE! (2) syzbot has found a reproducer for the following crash on: HEAD commit: b3418f8bddf4 Add linux-next specific files for 20190214 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12ccad60c00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8a3a37525a677c71 dashboard link: https://syzkaller.appspot.com/bug?extid=55de1eb4975dec156d8f compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16f63047400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12a2ed58c00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+55de1eb4975dec156d8f@...kaller.appspotmail.com ------------[ cut here ]------------ kernel BUG at drivers/android/binder_alloc.c:1141! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 7540 Comm: syz-executor013 Not tainted 5.0.0-rc6-next-20190214 #35 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:binder_alloc_do_buffer_copy+0xd6/0x510 drivers/android/binder_alloc.c:1141 Code: 02 00 0f 85 20 04 00 00 4d 8b 64 24 58 49 29 dc e8 9f e1 26 fc 4c 89 e6 4c 89 ef e8 b4 e2 26 fc 4d 39 e5 76 07 e8 8a e1 26 fc <0f> 0b e8 83 e1 26 fc 4c 8b 75 d0 4d 29 ec 4c 89 e6 4c 89 f7 e8 91 RSP: 0018:ffff88804a6cf558 EFLAGS: 00010293 RAX: ffff888033dc61c0 RBX: 0000000020001000 RCX: ffffffff8549806c RDX: 0000000000000000 RSI: ffffffff85498076 RDI: 0000000000000006 RBP: ffff88804a6cf5d8 R08: ffff888033dc61c0 R09: 0000000000000028 R10: ffffed10094d9f01 R11: ffff88804a6cf80f R12: 0000000000000008 R13: 0000000000000028 R14: ffff888069c1c210 R15: 0000000000000000 FS: 00000000017d9940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007b49a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: binder_alloc_copy_from_buffer+0x37/0x42 drivers/android/binder_alloc.c:1187 binder_get_object+0xa2/0x1e0 drivers/android/binder.c:2062 binder_transaction+0x2b4a/0x6690 drivers/android/binder.c:3231 binder_thread_write+0x64a/0x2820 drivers/android/binder.c:3792 binder_ioctl_write_read drivers/android/binder.c:4825 [inline] binder_ioctl+0x1033/0x183b drivers/android/binder.c:5002 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x444579 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff3621c708 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fff3621c710 RCX: 0000000000444579 RDX: 0000000020000440 RSI: 00000000c0306201 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000401000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402280 R13: 0000000000402310 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace e53003f51f970669 ]--- RIP: 0010:binder_alloc_do_buffer_copy+0xd6/0x510 drivers/android/binder_alloc.c:1141 Code: 02 00 0f 85 20 04 00 00 4d 8b 64 24 58 49 29 dc e8 9f e1 26 fc 4c 89 e6 4c 89 ef e8 b4 e2 26 fc 4d 39 e5 76 07 e8 8a e1 26 fc <0f> 0b e8 83 e1 26 fc 4c 8b 75 d0 4d 29 ec 4c 89 e6 4c 89 f7 e8 91 RSP: 0018:ffff88804a6cf558 EFLAGS: 00010293 RAX: ffff888033dc61c0 RBX: 0000000020001000 RCX: ffffffff8549806c RDX: 0000000000000000 RSI: ffffffff85498076 RDI: 0000000000000006 RBP: ffff88804a6cf5d8 R08: ffff888033dc61c0 R09: 0000000000000028 R10: ffffed10094d9f01 R11: ffff88804a6cf80f R12: 0000000000000008 R13: 0000000000000028 R14: ffff888069c1c210 R15: 0000000000000000 FS: 00000000017d9940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007b49a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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