================================================================== BUG: KASAN: slab-out-of-bounds in ip6_setup_cork+0xf4a/0x1200 net/ipv6/ip6_output.c:1230 at addr ffff8801c6a27ae4 Write of size 4 by task syz-executor2/17798 CPU: 0 PID: 17798 Comm: syz-executor2 Not tainted 4.9.60-g4ca16e6 #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801cee47608 ffffffff81d91389 ffff8801da001c80 ffff8801c6a27ae0 ffff8801c6a27ae8 ffffed0038d44f5c ffff8801c6a27ae4 ffff8801cee47630 ffffffff8153c1bc ffffed0038d44f5c ffff8801da001c80 0000000000000001 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160 [] print_address_description mm/kasan/report.c:198 [inline] [] kasan_report_error mm/kasan/report.c:287 [inline] [] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309 [] kasan_report mm/kasan/report.c:334 [inline] [] __asan_report_store4_noabort+0x2c/0x30 mm/kasan/report.c:334 [] ip6_setup_cork+0xf4a/0x1200 net/ipv6/ip6_output.c:1230 [] ip6_make_skb+0x1b8/0x440 net/ipv6/ip6_output.c:1802 [] udpv6_sendmsg+0x1b1d/0x2540 net/ipv6/udp.c:1240 [] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:753 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:645 [] SYSC_sendto+0x2c8/0x340 net/socket.c:1670 [] SyS_sendto+0x40/0x50 net/socket.c:1638 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Object at ffff8801c6a27ae0, in cache kmalloc-8 size: 8 Allocated: PID = 17798 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598 __kmalloc+0x11d/0x310 mm/slub.c:3741 kmalloc include/linux/slab.h:495 [inline] kzalloc include/linux/slab.h:636 [inline] ip6_setup_cork+0x194/0x1200 net/ipv6/ip6_output.c:1226 ip6_make_skb+0x1b8/0x440 net/ipv6/ip6_output.c:1802 udpv6_sendmsg+0x1b1d/0x2540 net/ipv6/udp.c:1240 inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:753 sock_sendmsg_nosec net/socket.c:635 [inline] sock_sendmsg+0xca/0x110 net/socket.c:645 SYSC_sendto+0x2c8/0x340 net/socket.c:1670 SyS_sendto+0x40/0x50 net/socket.c:1638 entry_SYSCALL_64_fastpath+0x23/0xc6 Freed: PID = 14683 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xf0/0x2f0 mm/slub.c:3878 kfree_const+0x31/0x40 mm/util.c:35 kernfs_put+0x15c/0x550 fs/kernfs/dir.c:517 sysfs_put include/linux/sysfs.h:528 [inline] kobject_del.part.3+0x42/0xf0 lib/kobject.c:578 kobject_del lib/kobject.c:676 [inline] kobject_cleanup lib/kobject.c:639 [inline] kobject_release+0x125/0x1a0 lib/kobject.c:674 kref_sub include/linux/kref.h:73 [inline] kref_put include/linux/kref.h:98 [inline] kobject_put+0x63/0xc0 lib/kobject.c:691 netdev_queue_update_kobjects+0x18d/0x270 net/core/net-sysfs.c:1346 remove_queue_kobjects net/core/net-sysfs.c:1396 [inline] netdev_unregister_kobject+0xaa/0x110 net/core/net-sysfs.c:1530 rollback_registered_many+0x562/0x960 net/core/dev.c:6828 rollback_registered+0x81/0xb0 net/core/dev.c:6846 unregister_netdevice_queue+0x81/0x140 net/core/dev.c:7833 unregister_netdevice include/linux/netdevice.h:2458 [inline] __tun_detach+0xa2c/0xc20 drivers/net/tun.c:567 tun_detach drivers/net/tun.c:578 [inline] tun_chr_close+0x44/0x60 drivers/net/tun.c:2372 __fput+0x28c/0x6e0 fs/file_table.c:208 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x115/0x190 kernel/task_work.c:116 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0x7e7/0x2a40 kernel/exit.c:833 do_group_exit+0x108/0x320 kernel/exit.c:937 get_signal+0x4d4/0x14e0 kernel/signal.c:2315 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:807 exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:156 prepare_exit_to_usermode arch/x86/entry/common.c:190 [inline] syscall_return_slowpath+0x1a0/0x1e0 arch/x86/entry/common.c:259 entry_SYSCALL_64_fastpath+0xc4/0xc6 Memory state around the buggy address: ffff8801c6a27980: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc ffff8801c6a27a00: fc fb fc fc fb fc fc fb fc fc fb fc fc 00 fc fc >ffff8801c6a27a80: fb fc fc fb fc fc fb fc fc fb fc fc 01 fc fc fb ^ ffff8801c6a27b00: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc ffff8801c6a27b80: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc ================================================================== ================================================================== BUG: KASAN: slab-out-of-bounds in ip6_setup_cork+0xf2c/0x1200 net/ipv6/ip6_output.c:1231 at addr ffff8801c6a27ae8 Write of size 2 by task syz-executor2/17798 CPU: 0 PID: 17798 Comm: syz-executor2 Tainted: G B 4.9.60-g4ca16e6 #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801cee47608 ffffffff81d91389 ffff8801da001c80 ffff8801c6a27ae0 ffff8801c6a27ae8 ffffed0038d44f5d ffff8801c6a27ae8 ffff8801cee47630 ffffffff8153c1bc ffffed0038d44f5d ffff8801da001c80 0000000000000001 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160 [] print_address_description mm/kasan/report.c:198 [inline] [] kasan_report_error mm/kasan/report.c:287 [inline] [] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309 [] kasan_report mm/kasan/report.c:333 [inline] [] __asan_report_store2_noabort+0x2c/0x30 mm/kasan/report.c:333 [] ip6_setup_cork+0xf2c/0x1200 net/ipv6/ip6_output.c:1231 [] ip6_make_skb+0x1b8/0x440 net/ipv6/ip6_output.c:1802 [] udpv6_sendmsg+0x1b1d/0x2540 net/ipv6/udp.c:1240 [] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:753 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:645 [] SYSC_sendto+0x2c8/0x340 net/socket.c:1670 [] SyS_sendto+0x40/0x50 net/socket.c:1638 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Object at ffff8801c6a27ae0, in cache kmalloc-8 size: 8 Allocated: PID = 17798 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598 __kmalloc+0x11d/0x310 mm/slub.c:3741 kmalloc include/linux/slab.h:495 [inline] kzalloc include/linux/slab.h:636 [inline] ip6_setup_cork+0x194/0x1200 net/ipv6/ip6_output.c:1226 ip6_make_skb+0x1b8/0x440 net/ipv6/ip6_output.c:1802 udpv6_sendmsg+0x1b1d/0x2540 net/ipv6/udp.c:1240 inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:753 sock_sendmsg_nosec net/socket.c:635 [inline] sock_sendmsg+0xca/0x110 net/socket.c:645 SYSC_sendto+0x2c8/0x340 net/socket.c:1670 SyS_sendto+0x40/0x50 net/socket.c:1638 entry_SYSCALL_64_fastpath+0x23/0xc6 Freed: PID = 14683 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xf0/0x2f0 mm/slub.c:3878 kfree_const+0x31/0x40 mm/util.c:35 kernfs_put+0x15c/0x550 fs/kernfs/dir.c:517 sysfs_put include/linux/sysfs.h:528 [inline] kobject_del.part.3+0x42/0xf0 lib/kobject.c:578 kobject_del lib/kobject.c:676 [inline] kobject_cleanup lib/kobject.c:639 [inline] kobject_release+0x125/0x1a0 lib/kobject.c:674 kref_sub include/linux/kref.h:73 [inline] kref_put include/linux/kref.h:98 [inline] kobject_put+0x63/0xc0 lib/kobject.c:691 netdev_queue_update_kobjects+0x18d/0x270 net/core/net-sysfs.c:1346 remove_queue_kobjects net/core/net-sysfs.c:1396 [inline] netdev_unregister_kobject+0xaa/0x110 net/core/net-sysfs.c:1530 rollback_registered_many+0x562/0x960 net/core/dev.c:6828 rollback_registered+0x81/0xb0 net/core/dev.c:6846 unregister_netdevice_queue+0x81/0x140 net/core/dev.c:7833 unregister_netdevice include/linux/netdevice.h:2458 [inline] __tun_detach+0xa2c/0xc20 drivers/net/tun.c:567 tun_detach drivers/net/tun.c:578 [inline] tun_chr_close+0x44/0x60 drivers/net/tun.c:2372 __fput+0x28c/0x6e0 fs/file_table.c:208 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x115/0x190 kernel/task_work.c:116 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0x7e7/0x2a40 kernel/exit.c:833 do_group_exit+0x108/0x320 kernel/exit.c:937 get_signal+0x4d4/0x14e0 kernel/signal.c:2315 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:807 exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:156 prepare_exit_to_usermode arch/x86/entry/common.c:190 [inline] syscall_return_slowpath+0x1a0/0x1e0 arch/x86/entry/common.c:259 entry_SYSCALL_64_fastpath+0xc4/0xc6 Memory state around the buggy address: ffff8801c6a27980: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc ffff8801c6a27a00: fc fb fc fc fb fc fc fb fc fc fb fc fc 00 fc fc >ffff8801c6a27a80: fb fc fc fb fc fc fb fc fc fb fc fc 01 fc fc fb ^ ffff8801c6a27b00: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc ffff8801c6a27b80: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc ================================================================== ================================================================== BUG: KASAN: slab-out-of-bounds in ip6_setup_cork+0xf40/0x1200 net/ipv6/ip6_output.c:1232 at addr ffff8801c6a27aea Write of size 2 by task syz-executor2/17798 CPU: 0 PID: 17798 Comm: syz-executor2 Tainted: G B 4.9.60-g4ca16e6 #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801cee47608 ffffffff81d91389 ffff8801da001c80 ffff8801c6a27ae0 ffff8801c6a27ae8 ffffed0038d44f5d ffff8801c6a27aea ffff8801cee47630 ffffffff8153c1bc ffffed0038d44f5d ffff8801da001c80 0000000000000001 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160 [] print_address_description mm/kasan/report.c:198 [inline] [] kasan_report_error mm/kasan/report.c:287 [inline] [] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309 [] kasan_report mm/kasan/report.c:333 [inline] [] __asan_report_store2_noabort+0x2c/0x30 mm/kasan/report.c:333 [] ip6_setup_cork+0xf40/0x1200 net/ipv6/ip6_output.c:1232 [] ip6_make_skb+0x1b8/0x440 net/ipv6/ip6_output.c:1802 [] udpv6_sendmsg+0x1b1d/0x2540 net/ipv6/udp.c:1240 [] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:753 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:645 [] SYSC_sendto+0x2c8/0x340 net/socket.c:1670 [] SyS_sendto+0x40/0x50 net/socket.c:1638 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Object at ffff8801c6a27ae0, in cache kmalloc-8 size: 8 Allocated: PID = 8 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598 __kmalloc+0x11d/0x310 mm/slub.c:3741 kmalloc include/linux/slab.h:495 [inline] kzalloc include/linux/slab.h:636 [inline] ip6_setup_cork+0x194/0x1200 net/ipv6/ip6_output.c:1226 ip6_make_skb+0x1b8/0x440 net/ipv6/ip6_output.c:1802 udpv6_sendmsg+0x1b1d/0x2540 net/ipv6/udp.c:1240 inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:753 sock_sendmsg_nosec net/socket.c:635 [inline] sock_sendmsg+0xca/0x110 net/socket.c:645 SYSC_sendto+0x2c8/0x340 net/socket.c:1670 SyS_sendto+0x40/0x50 net/socket.c:1638 entry_SYSCALL_64_fastpath+0x23/0xc6 Freed: PID = 14683 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xf0/0x2f0 mm/slub.c:3878 kfree_const+0x31/0x40 mm/util.c:35 kernfs_put+0x15c/0x550 fs/kernfs/dir.c:517 sysfs_put include/linux/sysfs.h:528 [inline] kobject_del.part.3+0x42/0xf0 lib/kobject.c:578 kobject_del lib/kobject.c:676 [inline] kobject_cleanup lib/kobject.c:639 [inline] kobject_release+0x125/0x1a0 lib/kobject.c:674 kref_sub include/linux/kref.h:73 [inline] kref_put include/linux/kref.h:98 [inline] kobject_put+0x63/0xc0 lib/kobject.c:691 netdev_queue_update_kobjects+0x18d/0x270 net/core/net-sysfs.c:1346 remove_queue_kobjects net/core/net-sysfs.c:1396 [inline] netdev_unregister_kobject+0xaa/0x110 net/core/net-sysfs.c:1530 rollback_registered_many+0x562/0x960 net/core/dev.c:6828 rollback_registered+0x81/0xb0 net/core/dev.c:6846 unregister_netdevice_queue+0x81/0x140 net/core/dev.c:7833 unregister_netdevice include/linux/netdevice.h:2458 [inline] __tun_detach+0xa2c/0xc20 drivers/net/tun.c:567 tun_detach drivers/net/tun.c:578 [inline] tun_chr_close+0x44/0x60 drivers/net/tun.c:2372 __fput+0x28c/0x6e0 fs/file_table.c:208 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x115/0x190 kernel/task_work.c:116 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0x7e7/0x2a40 kernel/exit.c:833 do_group_exit+0x108/0x320 kernel/exit.c:937 get_signal+0x4d4/0x14e0 kernel/signal.c:2315 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:807 exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:156 prepare_exit_to_usermode arch/x86/entry/common.c:190 [inline] syscall_return_slowpath+0x1a0/0x1e0 arch/x86/entry/common.c:259 entry_SYSCALL_64_fastpath+0xc4/0xc6 Memory state around the buggy address: ffff8801c6a27980: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc ffff8801c6a27a00: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc >ffff8801c6a27a80: fb fc fc fb fc fc fb fc fc fb fc fc 01 fc fc fb ^ ffff8801c6a27b00: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc ffff8801c6a27b80: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc ================================================================== ================================================================== BUG: KASAN: use-after-free in ip6_setup_cork+0x1048/0x1200 net/ipv6/ip6_output.c:1234 at addr ffff8801c6a27af8 Write of size 8 by task syz-executor2/17798 CPU: 0 PID: 17798 Comm: syz-executor2 Tainted: G B 4.9.60-g4ca16e6 #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801cee47608 ffffffff81d91389 ffff8801da001c80 ffff8801c6a27af8 ffff8801c6a27b00 ffffed0038d44f5f ffff8801c6a27af8 ffff8801cee47630 ffffffff8153c1bc ffffed0038d44f5f ffff8801da001c80 0000000000000001 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160 [] print_address_description mm/kasan/report.c:198 [inline] [] kasan_report_error mm/kasan/report.c:287 [inline] [] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309 [] kasan_report mm/kasan/report.c:335 [inline] [] __asan_report_store8_noabort+0x2c/0x30 mm/kasan/report.c:335 [] ip6_setup_cork+0x1048/0x1200 net/ipv6/ip6_output.c:1234 [] ip6_make_skb+0x1b8/0x440 net/ipv6/ip6_output.c:1802 [] udpv6_sendmsg+0x1b1d/0x2540 net/ipv6/udp.c:1240 [] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:753 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:645 [] SYSC_sendto+0x2c8/0x340 net/socket.c:1670 [] SyS_sendto+0x40/0x50 net/socket.c:1638 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Object at ffff8801c6a27af8, in cache kmalloc-8 size: 8 Allocated: PID = 17754 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598 __kmalloc+0x11d/0x310 mm/slub.c:3741 kmalloc_array include/linux/slab.h:582 [inline] check_load_and_stores net/core/filter.c:652 [inline] bpf_check_classic net/core/filter.c:861 [inline] bpf_prepare_filter+0x5ed/0xd90 net/core/filter.c:1042 bpf_prog_create_from_user+0x1c8/0x2c0 net/core/filter.c:1162 seccomp_prepare_filter kernel/seccomp.c:373 [inline] seccomp_prepare_user_filter kernel/seccomp.c:408 [inline] seccomp_set_mode_filter kernel/seccomp.c:750 [inline] do_seccomp+0x632/0x1860 kernel/seccomp.c:800 SYSC_seccomp kernel/seccomp.c:809 [inline] SyS_seccomp+0x24/0x30 kernel/seccomp.c:806 entry_SYSCALL_64_fastpath+0x23/0xc6 Freed: PID = 17754 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xf0/0x2f0 mm/slub.c:3878 check_load_and_stores net/core/filter.c:694 [inline] bpf_check_classic net/core/filter.c:861 [inline] bpf_prepare_filter+0x719/0xd90 net/core/filter.c:1042 bpf_prog_create_from_user+0x1c8/0x2c0 net/core/filter.c:1162 seccomp_prepare_filter kernel/seccomp.c:373 [inline] seccomp_prepare_user_filter kernel/seccomp.c:408 [inline] seccomp_set_mode_filter kernel/seccomp.c:750 [inline] do_seccomp+0x632/0x1860 kernel/seccomp.c:800 SYSC_seccomp kernel/seccomp.c:809 [inline] SyS_seccomp+0x24/0x30 kernel/seccomp.c:806 entry_SYSCALL_64_fastpath+0x23/0xc6 Memory state around the buggy address: ffff8801c6a27980: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc ffff8801c6a27a00: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc >ffff8801c6a27a80: fb fc fc fb fc fc fb fc fc fb fc fc 01 fc fc fb ^ ffff8801c6a27b00: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc ffff8801c6a27b80: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc ================================================================== ================================================================== BUG: KASAN: slab-out-of-bounds in ip6_setup_cork+0x1102/0x1200 net/ipv6/ip6_output.c:1239 at addr ffff8801c6a27b08 Write of size 8 by task syz-executor2/17798 CPU: 0 PID: 17798 Comm: syz-executor2 Tainted: G B 4.9.60-g4ca16e6 #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801cee47608 ffffffff81d91389 ffff8801da001c80 ffff8801c6a27af8 ffff8801c6a27b00 ffffed0038d44f61 ffff8801c6a27b08 ffff8801cee47630 ffffffff8153c1bc ffffed0038d44f61 ffff8801da001c80 0000000000000001 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160 [] print_address_description mm/kasan/report.c:198 [inline] [] kasan_report_error mm/kasan/report.c:287 [inline] [] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309 [] kasan_report mm/kasan/report.c:335 [inline] [] __asan_report_store8_noabort+0x2c/0x30 mm/kasan/report.c:335 [] ip6_setup_cork+0x1102/0x1200 net/ipv6/ip6_output.c:1239 [] ip6_make_skb+0x1b8/0x440 net/ipv6/ip6_output.c:1802 [] udpv6_sendmsg+0x1b1d/0x2540 net/ipv6/udp.c:1240 [] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:753 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:645 [] SYSC_sendto+0x2c8/0x340 net/socket.c:1670 [] SyS_sendto+0x40/0x50 net/socket.c:1638 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Object at ffff8801c6a27af8, in cache kmalloc-8 size: 8 Allocated: PID = 17754 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598 __kmalloc+0x11d/0x310 mm/slub.c:3741 kmalloc_array include/linux/slab.h:582 [inline] check_load_and_stores net/core/filter.c:652 [inline] bpf_check_classic net/core/filter.c:861 [inline] bpf_prepare_filter+0x5ed/0xd90 net/core/filter.c:1042 bpf_prog_create_from_user+0x1c8/0x2c0 net/core/filter.c:1162 seccomp_prepare_filter kernel/seccomp.c:373 [inline] seccomp_prepare_user_filter kernel/seccomp.c:408 [inline] seccomp_set_mode_filter kernel/seccomp.c:750 [inline] do_seccomp+0x632/0x1860 kernel/seccomp.c:800 SYSC_seccomp kernel/seccomp.c:809 [inline] SyS_seccomp+0x24/0x30 kernel/seccomp.c:806 entry_SYSCALL_64_fastpath+0x23/0xc6 Freed: PID = 17754 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xf0/0x2f0 mm/slub.c:3878 check_load_and_stores net/core/filter.c:694 [inline] bpf_check_classic net/core/filter.c:861 [inline] bpf_prepare_filter+0x719/0xd90 net/core/filter.c:1042 bpf_prog_create_from_user+0x1c8/0x2c0 net/core/filter.c:1162 seccomp_prepare_filter kernel/seccomp.c:373 [inline] seccomp_prepare_user_filter kernel/seccomp.c:408 [inline] seccomp_set_mode_filter kernel/seccomp.c:750 [inline] do_seccomp+0x632/0x1860 kernel/seccomp.c:800 SYSC_seccomp kernel/seccomp.c:809 [inline] SyS_seccomp+0x24/0x30 kernel/seccomp.c:806 entry_SYSCALL_64_fastpath+0x23/0xc6 Memory state around the buggy address: ffff8801c6a27a00: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc ffff8801c6a27a80: fb fc fc 00 fc fc fb fc fc fb fc fc 01 fc fc fb >ffff8801c6a27b00: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc ^ ffff8801c6a27b80: fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc ffff8801c6a27c00: fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb ================================================================== ================================================================== BUG: KASAN: slab-out-of-bounds in ip6_setup_cork+0x10b6/0x1200 net/ipv6/ip6_output.c:1241 at addr ffff8801c6a27b08 Read of size 8 by task syz-executor2/17798 CPU: 0 PID: 17798 Comm: syz-executor2 Tainted: G B 4.9.60-g4ca16e6 #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801cee47608 ffffffff81d91389 ffff8801da001c80 ffff8801c6a27af8 ffff8801c6a27b00 ffffed0038d44f61 ffff8801c6a27b08 ffff8801cee47630 ffffffff8153c1bc ffffed0038d44f61 ffff8801da001c80 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160 [] print_address_description mm/kasan/report.c:198 [inline] [] kasan_report_error mm/kasan/report.c:287 [inline] [] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309 [] kasan_report mm/kasan/report.c:330 [inline] [] __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:330 [] ip6_setup_cork+0x10b6/0x1200 net/ipv6/ip6_output.c:1241 [] ip6_make_skb+0x1b8/0x440 net/ipv6/ip6_output.c:1802 [] udpv6_sendmsg+0x1b1d/0x2540 net/ipv6/udp.c:1240 [] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:753 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:645 [] SYSC_sendto+0x2c8/0x340 net/socket.c:1670 [] SyS_sendto+0x40/0x50 net/socket.c:1638 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Object at ffff8801c6a27af8, in cache kmalloc-8 size: 8 Allocated: PID = 17754 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598 __kmalloc+0x11d/0x310 mm/slub.c:3741 kmalloc_array include/linux/slab.h:582 [inline] check_load_and_stores net/core/filter.c:652 [inline] bpf_check_classic net/core/filter.c:861 [inline] bpf_prepare_filter+0x5ed/0xd90 net/core/filter.c:1042 bpf_prog_create_from_user+0x1c8/0x2c0 net/core/filter.c:1162 seccomp_prepare_filter kernel/seccomp.c:373 [inline] seccomp_prepare_user_filter kernel/seccomp.c:408 [inline] seccomp_set_mode_filter kernel/seccomp.c:750 [inline] do_seccomp+0x632/0x1860 kernel/seccomp.c:800 SYSC_seccomp kernel/seccomp.c:809 [inline] SyS_seccomp+0x24/0x30 kernel/seccomp.c:806 entry_SYSCALL_64_fastpath+0x23/0xc6 Freed: PID = 3332536984 BUG: unable to handle kernel paging request at ffffffff87108fa8 IP: [] depot_fetch_stack+0x15/0x40 lib/stackdepot.c:194 PGD 441e067 [ 118.390825] PUD 441f063 Oops: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 17798 Comm: syz-executor2 Tainted: G B 4.9.60-g4ca16e6 #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cb1c8000 task.stack: ffff8801cee40000 RIP: 0010:[] [] depot_fetch_stack+0x15/0x40 lib/stackdepot.c:194 RSP: 0018:ffff8801cee475d8 EFLAGS: 00010006 RAX: 00000000001f8801 RBX: ffff8801c6a27b08 RCX: ffffc90001dc9000 RDX: 0000000000000000 RSI: ffff8801cee475e0 RDI: 0000000000003ff0 RBP: ffff8801cee47608 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000000 R12: ffff8801c6a27af8 R13: ffff8801c6a27b00 R14: ffffed0038d44f61 R15: ffff8801c6a27b08 FS: 00007fcb9dda8700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff87108fa8 CR3: 00000001d0c32000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8156353e 0000000000000000 ffff8801da001c80 0000000000000008 9402b162739d50af ffff8801da001c80 ffff8801cee47630 ffffffff8153c208 ffffed0038d44f61 ffff8801da001c80 0000000000000000 ffff8801cee476b8 Call Trace: [] kasan_object_err+0x68/0x70 mm/kasan/report.c:170 [] print_address_description mm/kasan/report.c:198 [inline] [] kasan_report_error mm/kasan/report.c:287 [inline] [] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309 [] kasan_report mm/kasan/report.c:330 [inline] [] __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:330 [] ip6_setup_cork+0x10b6/0x1200 net/ipv6/ip6_output.c:1241 [] ip6_make_skb+0x1b8/0x440 net/ipv6/ip6_output.c:1802 [] udpv6_sendmsg+0x1b1d/0x2540 net/ipv6/udp.c:1240 [] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:753 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:645 [] SYSC_sendto+0x2c8/0x340 net/socket.c:1670 [] SyS_sendto+0x40/0x50 net/socket.c:1638 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Code: a4 52 ff 0f 0b e8 5c ca 6f ff eb de 66 2e 0f 1f 84 00 00 00 00 00 89 f8 c1 ef 11 55 25 ff ff 1f 00 81 e7 f0 3f 00 00 48 89 e5 5d <48> 03 3c c5 a0 4f 14 86 8b 47 0c 48 83 c7 18 c7 46 10 00 00 00 RIP [] depot_fetch_stack+0x15/0x40 lib/stackdepot.c:194 RSP CR2: ffffffff87108fa8 ---[ end trace 3c8c33acb6d70d67 ]---