================================================================== BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0xa46/0x1000 lib/iov_iter.c:527 Write of size 12 at addr ffff88807ea3e6e7 by task kworker/0:8/3769 CPU: 0 PID: 3769 Comm: kworker/0:8 Not tainted 6.1.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events p9_read_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x220 mm/kasan/report.c:395 kasan_report+0x139/0x170 mm/kasan/report.c:495 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189 memcpy+0x3c/0x60 mm/kasan/shadow.c:66 _copy_to_iter+0xa46/0x1000 lib/iov_iter.c:527 copy_page_to_iter+0xd2/0x1b0 lib/iov_iter.c:725 pipe_read+0x58a/0x12a0 fs/pipe.c:307 __kernel_read+0x3c4/0x7e0 fs/read_write.c:428 p9_fd_read net/9p/trans_fd.c:266 [inline] p9_read_work+0x389/0xfa0 net/9p/trans_fd.c:301 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 28165: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0xaf/0x1a0 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] p9_fcall_init net/9p/client.c:228 [inline] p9_tag_alloc net/9p/client.c:293 [inline] p9_client_prepare_req+0x4f9/0xbb0 net/9p/client.c:631 p9_client_rpc+0x1a2/0xad0 net/9p/client.c:678 p9_client_walk+0x1d6/0x690 net/9p/client.c:1152 clone_fid fs/9p/fid.h:21 [inline] v9fs_fid_xattr_set+0x288/0x440 fs/9p/xattr.c:118 v9fs_xattr_set+0x55/0x100 fs/9p/xattr.c:100 __vfs_setxattr+0x3f4/0x430 fs/xattr.c:182 __vfs_setxattr_noperm+0x128/0x5d0 fs/xattr.c:216 vfs_setxattr+0x228/0x450 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr fs/xattr.c:617 [inline] path_setxattr+0x3b0/0x4b0 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:648 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807ea3e6e0 which belongs to the cache kmalloc-16 of size 16 The buggy address is located 7 bytes inside of 16-byte region [ffff88807ea3e6e0, ffff88807ea3e6f0) The buggy address belongs to the physical page: page:ffffea0001fa8f80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ea3e flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff8880128413c0 raw: 0000000000000000 0000000080800080 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3688, tgid 3688 (syz-executor.4), ts 589267147534, free_ts 589262315916 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4288 __alloc_pages+0x259/0x560 mm/page_alloc.c:5555 __alloc_pages_node include/linux/gfp.h:223 [inline] alloc_slab_page+0x2e/0xf0 mm/slub.c:1796 allocate_slab+0x5e/0x4b0 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0x7f4/0xeb0 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node+0x9e/0x190 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x6e/0x180 mm/util.c:581 xt_jumpstack_alloc net/netfilter/x_tables.c:1354 [inline] xt_replace_table+0x175/0x770 net/netfilter/x_tables.c:1393 __do_replace+0x18f/0xac0 net/ipv4/netfilter/ip_tables.c:1067 do_replace net/ipv4/netfilter/ip_tables.c:1140 [inline] do_ipt_set_ctl+0x2c5d/0x3da0 net/ipv4/netfilter/ip_tables.c:1630 nf_setsockopt+0x29f/0x2d0 net/netfilter/nf_sockopt.c:101 __sys_setsockopt+0x65d/0xa00 net/socket.c:2252 __do_sys_setsockopt net/socket.c:2263 [inline] __se_sys_setsockopt net/socket.c:2260 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2260 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x7d/0x630 mm/page_alloc.c:3483 tlb_batch_list_free mm/mmu_gather.c:75 [inline] tlb_finish_mmu+0x124/0x200 mm/mmu_gather.c:366 exit_mmap+0x2b1/0x670 mm/mmap.c:3105 __mmput+0x114/0x3b0 kernel/fork.c:1185 exit_mm+0x217/0x2f0 kernel/exit.c:516 do_exit+0x5e7/0x2070 kernel/exit.c:807 do_group_exit+0x1fd/0x2b0 kernel/exit.c:950 get_signal+0x1743/0x1810 kernel/signal.c:2858 arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88807ea3e580: fa fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc ffff88807ea3e600: fb fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc >ffff88807ea3e680: fb fb fc fc fa fb fc fc fb fb fc fc 00 03 fc fc ^ ffff88807ea3e700: 00 00 fc fc fb fb fc fc 00 00 fc fc fb fb fc fc ffff88807ea3e780: fb fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc ==================================================================