================================================================== BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0xd18/0x1140 lib/iov_iter.c:527 Write of size 169 at addr ffff88804e4a5c47 by task kworker/3:1/3732 CPU: 3 PID: 3732 Comm: kworker/3:1 Not tainted 6.1.0-rc6-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: events p9_read_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:189 memcpy+0x3d/0x60 mm/kasan/shadow.c:66 _copy_to_iter+0xd18/0x1140 lib/iov_iter.c:527 copy_page_to_iter+0xe0/0xa20 lib/iov_iter.c:725 pipe_read+0x50e/0x1110 fs/pipe.c:307 __kernel_read+0x2ca/0x7c0 fs/read_write.c:428 kernel_read+0xc3/0x1c0 fs/read_write.c:446 p9_fd_read net/9p/trans_fd.c:266 [inline] p9_read_work+0x2b0/0x1040 net/9p/trans_fd.c:301 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 22869: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0x5a/0xd0 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] p9_fcall_init+0x97/0x210 net/9p/client.c:228 p9_tag_alloc+0x208/0x840 net/9p/client.c:293 p9_client_prepare_req+0x177/0x590 net/9p/client.c:631 p9_client_rpc+0x1a1/0xd70 net/9p/client.c:678 p9_client_walk+0x1a0/0x540 net/9p/client.c:1152 clone_fid fs/9p/fid.h:21 [inline] v9fs_fid_xattr_set+0xe4/0x2b0 fs/9p/xattr.c:118 v9fs_xattr_set fs/9p/xattr.c:100 [inline] v9fs_xattr_handler_set+0x6f/0x120 fs/9p/xattr.c:159 __vfs_removexattr+0x102/0x170 fs/xattr.c:479 __vfs_removexattr_locked+0x1b0/0x440 fs/xattr.c:514 vfs_removexattr+0xcf/0x260 fs/xattr.c:536 removexattr+0xd0/0x130 fs/xattr.c:878 path_removexattr+0x174/0x1a0 fs/xattr.c:892 __do_sys_removexattr fs/xattr.c:906 [inline] __se_sys_removexattr fs/xattr.c:903 [inline] __ia32_sys_removexattr+0x57/0x80 fs/xattr.c:903 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 The buggy address belongs to the object at ffff88804e4a5c40 which belongs to the cache kmalloc-16 of size 16 The buggy address is located 7 bytes inside of 16-byte region [ffff88804e4a5c40, ffff88804e4a5c50) The buggy address belongs to the physical page: page:ffffea0001392940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4e4a5 flags: 0x4fff00000000200(slab|node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000200 dead000000000100 dead000000000122 ffff8880120423c0 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 3744, tgid 3744 (syz-executor.2), ts 749091079341, free_ts 743865284493 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4288 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5555 __alloc_pages_node include/linux/gfp.h:223 [inline] alloc_slab_page mm/slub.c:1796 [inline] allocate_slab+0x80/0x300 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3180 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279 slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x199/0x3e0 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node+0x4d/0xd0 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x43/0x1b0 mm/util.c:581 xt_jumpstack_alloc net/netfilter/x_tables.c:1354 [inline] xt_replace_table+0x1a7/0x8c0 net/netfilter/x_tables.c:1393 __do_replace+0x1d7/0x900 net/ipv4/netfilter/arp_tables.c:912 compat_do_replace.constprop.0+0x2d7/0x410 net/ipv6/netfilter/ip6_tables.c:1533 do_ip6t_set_ctl+0x5bc/0xb30 net/ipv6/netfilter/ip6_tables.c:1636 nf_setsockopt+0x87/0xe0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x12b/0x190 net/ipv6/ipv6_sockglue.c:1030 tcp_setsockopt+0x9f/0x100 net/ipv4/tcp.c:3801 __sys_setsockopt+0x2da/0x6a0 net/socket.c:2252 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+0x65c/0xd90 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483 __vunmap+0x85d/0xd30 mm/vmalloc.c:2713 __vfree+0x3c/0xd0 mm/vmalloc.c:2761 vfree+0x5e/0x90 mm/vmalloc.c:2792 kvfree+0x32/0x50 mm/util.c:625 htab_map_free+0x41e/0x910 kernel/bpf/hashtab.c:1526 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff88804e4a5b00: fb fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc ffff88804e4a5b80: fb fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc >ffff88804e4a5c00: fb fb fc fc fb fb fc fc 00 03 fc fc fa fb fc fc ^ ffff88804e4a5c80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc ffff88804e4a5d00: 00 00 fc fc 00 00 fc fc fa fb fc fc fa fb fc fc ==================================================================