On Mon, Apr 23, 2018 at 9:02 AM, syzbot <syzbot+cd494c1dd681d4d93ebb@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot hit the following crash on upstream commit > 83beed7b2b26f232d782127792dd0cd4362fdc41 (Fri Apr 20 17:56:32 2018 +0000) > Merge branch 'fixes' of > git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=cd494c1dd681d4d93ebb > > So far this crash happened 305 times on net-next, upstream. > C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6684817483628544 > syzkaller reproducer: > https://syzkaller.appspot.com/x/repro.syz?id=6321732692475904 > Raw console output: > https://syzkaller.appspot.com/x/log.txt?id=5381423422767104 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=1808800213120130118 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+cd494c1dd681d4d93ebb@xxxxxxxxxxxxxxxxxxxxxxxxx > 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. > > ================================================================== > BUG: KASAN: slab-out-of-bounds in ipv6_addr_equal include/net/ipv6.h:507 > [inline] > BUG: KASAN: slab-out-of-bounds in __sctp_v6_cmp_addr+0x4c7/0x530 > net/sctp/ipv6.c:580 Two v4 addresses went into ipv6_addr_equal, this happens when one v4 socket bind v4 addr A, then another v6 socket tries to bind the same v4 addr A. This is an old issue, I will send a fix soon. Thanks. > Read of size 8 at addr ffff8801b58626d0 by task syzkaller106428/4452 > > CPU: 1 PID: 4452 Comm: syzkaller106428 Not tainted 4.17.0-rc1+ #10 > 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+0x1b9/0x294 lib/dump_stack.c:113 > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > ipv6_addr_equal include/net/ipv6.h:507 [inline] > __sctp_v6_cmp_addr+0x4c7/0x530 net/sctp/ipv6.c:580 > sctp_inet6_cmp_addr+0x169/0x1a0 net/sctp/ipv6.c:898 > sctp_bind_addr_conflict+0x28c/0x470 net/sctp/bind_addr.c:368 > sctp_get_port_local+0x9fc/0x1540 net/sctp/socket.c:7515 > sctp_do_bind+0x21c/0x5f0 net/sctp/socket.c:435 > sctp_bindx_add+0x90/0x1a0 net/sctp/socket.c:529 > sctp_setsockopt_bindx+0x2ad/0x320 net/sctp/socket.c:1058 > sctp_setsockopt+0x12c4/0x7000 net/sctp/socket.c:4227 > sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3039 > __sys_setsockopt+0x1bd/0x390 net/socket.c:1903 > __do_sys_setsockopt net/socket.c:1914 [inline] > __se_sys_setsockopt net/socket.c:1911 [inline] > __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911 > do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x445839 > RSP: 002b:00007fbe3f0fdd98 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 > RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445839 > RDX: 0000000000000064 RSI: 0000000000000084 RDI: 0000000000000004 > RBP: 00000000006dac20 R08: 0000000000000010 R09: 000000000000a6fe > R10: 00000000205ba000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007ffc1404827f R14: 00007fbe3f0fe9c0 R15: 0000000000000003 > > Allocated by task 4452: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 > __do_kmalloc_node mm/slab.c:3682 [inline] > __kmalloc_node+0x47/0x70 mm/slab.c:3689 > kmalloc_node include/linux/slab.h:554 [inline] > kvmalloc_node+0x6b/0x100 mm/util.c:421 > kvmalloc include/linux/mm.h:550 [inline] > vmemdup_user+0x2d/0xa0 mm/util.c:186 > sctp_setsockopt_bindx+0x5d/0x320 net/sctp/socket.c:1022 > sctp_setsockopt+0x12c4/0x7000 net/sctp/socket.c:4227 > sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3039 > __sys_setsockopt+0x1bd/0x390 net/socket.c:1903 > __do_sys_setsockopt net/socket.c:1914 [inline] > __se_sys_setsockopt net/socket.c:1911 [inline] > __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911 > do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > Freed by task 2818: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 > __cache_free mm/slab.c:3498 [inline] > kfree+0xd9/0x260 mm/slab.c:3813 > single_release+0x8f/0xb0 fs/seq_file.c:609 > __fput+0x34d/0x890 fs/file_table.c:209 > ____fput+0x15/0x20 fs/file_table.c:243 > task_work_run+0x1e4/0x290 kernel/task_work.c:113 > tracehook_notify_resume include/linux/tracehook.h:191 [inline] > exit_to_usermode_loop+0x2bd/0x310 arch/x86/entry/common.c:166 > prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] > syscall_return_slowpath arch/x86/entry/common.c:265 [inline] > do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > The buggy address belongs to the object at ffff8801b58626c0 > which belongs to the cache kmalloc-32 of size 32 > The buggy address is located 16 bytes inside of > 32-byte region [ffff8801b58626c0, ffff8801b58626e0) > The buggy address belongs to the page: > page:ffffea0006d61880 count:1 mapcount:0 mapping:ffff8801b5862000 > index:0xffff8801b5862fc1 > flags: 0x2fffc0000000100(slab) > raw: 02fffc0000000100 ffff8801b5862000 ffff8801b5862fc1 0000000100000032 > raw: ffffea0006ddd1e0 ffffea0006dd2860 ffff8801da8001c0 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801b5862580: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc > ffff8801b5862600: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >> >> ffff8801b5862680: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc > > ^ > ffff8801b5862700: 00 00 00 00 fc fc fc fc 00 00 04 fc fc fc fc fc > ffff8801b5862780: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc > ================================================================== > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@xxxxxxxxxxxxxxxx. > > 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. > -- > To unsubscribe from this list: send the line "unsubscribe linux-sctp" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
