================================================================== BUG: KASAN: slab-out-of-bounds in fuse_retrieve fs/fuse/dev.c:1911 [inline] BUG: KASAN: slab-out-of-bounds in fuse_notify_retrieve fs/fuse/dev.c:1959 [inline] BUG: KASAN: slab-out-of-bounds in fuse_notify fs/fuse/dev.c:2067 [inline] BUG: KASAN: slab-out-of-bounds in fuse_dev_do_write+0x308b/0x3420 fs/fuse/dev.c:2158 Write of size 4 at addr ffff888034a80cdc by task syz.0.755/9641 CPU: 0 UID: 0 PID: 9641 Comm: syz.0.755 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 fuse_retrieve fs/fuse/dev.c:1911 [inline] fuse_notify_retrieve fs/fuse/dev.c:1959 [inline] fuse_notify fs/fuse/dev.c:2067 [inline] fuse_dev_do_write+0x308b/0x3420 fs/fuse/dev.c:2158 fuse_dev_write+0x155/0x1e0 fs/fuse/dev.c:2242 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d3/0x11d0 fs/read_write.c:686 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f636098ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f636181f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f6360bb5fa0 RCX: 00007f636098ebe9 RDX: 0000000000000030 RSI: 0000200000000140 RDI: 0000000000000006 RBP: 00007f6360a11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6360bb6038 R14: 00007f6360bb5fa0 R15: 00007ffe9b153168 Allocated by task 9641: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4365 [inline] __kmalloc_noprof+0x223/0x510 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] fuse_retrieve fs/fuse/dev.c:1879 [inline] fuse_notify_retrieve fs/fuse/dev.c:1959 [inline] fuse_notify fs/fuse/dev.c:2067 [inline] fuse_dev_do_write+0x1c50/0x3420 fs/fuse/dev.c:2158 fuse_dev_write+0x155/0x1e0 fs/fuse/dev.c:2242 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d3/0x11d0 fs/read_write.c:686 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888034a80c00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 4 bytes to the right of allocated 216-byte region [ffff888034a80c00, ffff888034a80cd8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x34a80 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b842b40 ffffea0000d2b300 dead000000000002 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b842b40 ffffea0000d2b300 dead000000000002 head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffea0000d2a001 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5977, tgid 5977 (syz-executor), ts 47623330682, free_ts 47620885827 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab mm/slub.c:2655 [inline] new_slab+0x247/0x330 mm/slub.c:2709 ___slab_alloc+0xcf2/0x1740 mm/slub.c:3891 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3981 __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_noprof+0x2f2/0x510 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] new_dir fs/proc/proc_sysctl.c:966 [inline] get_subdir fs/proc/proc_sysctl.c:1010 [inline] sysctl_mkdir_p fs/proc/proc_sysctl.c:1320 [inline] __register_sysctl_table+0xea2/0x1900 fs/proc/proc_sysctl.c:1395 neigh_sysctl_register+0x31f/0x670 net/core/neighbour.c:3887 addrconf_sysctl_register+0xb9/0x1f0 net/ipv6/addrconf.c:7365 ipv6_add_dev+0xb31/0x15f0 net/ipv6/addrconf.c:460 addrconf_notify+0x53e/0x19e0 net/ipv6/addrconf.c:3650 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] register_netdevice+0x182e/0x2270 net/core/dev.c:11244 page last free pid 5977 tgid 5977 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0x7d5/0x10f0 mm/page_alloc.c:2895 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:340 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] __kmalloc_cache_noprof+0x1f1/0x3e0 mm/slub.c:4391 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] ref_tracker_alloc+0x18e/0x5b0 lib/ref_tracker.c:271 __netdev_tracker_alloc include/linux/netdevice.h:4349 [inline] netdev_hold include/linux/netdevice.h:4378 [inline] netdev_hold include/linux/netdevice.h:4373 [inline] rx_queue_add_kobject net/core/net-sysfs.c:1255 [inline] net_rx_queue_update_kobjects+0x334/0x770 net/core/net-sysfs.c:1320 register_queue_kobjects net/core/net-sysfs.c:2112 [inline] netdev_register_kobject+0x290/0x3d0 net/core/net-sysfs.c:2360 register_netdevice+0x13dc/0x2270 net/core/dev.c:11206 veth_newlink+0x446/0xa00 drivers/net/veth.c:1884 rtnl_newlink_create net/core/rtnetlink.c:3825 [inline] __rtnl_newlink net/core/rtnetlink.c:3942 [inline] rtnl_newlink+0xc42/0x2000 net/core/rtnetlink.c:4057 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5a7/0x870 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] __sys_sendto+0x4a3/0x520 net/socket.c:2228 Memory state around the buggy address: ffff888034a80b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888034a80c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888034a80c80: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ^ ffff888034a80d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888034a80d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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