================================================================== BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0xa46/0x1000 lib/iov_iter.c:527 Write of size 22 at addr ffff88807c395f47 by task kworker/1:1/26 CPU: 1 PID: 26 Comm: kworker/1:1 Not tainted 6.1.0-rc4-syzkaller-00362-gfef7fd48922d #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 3608: 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 v9fs_vfs_lookup+0x1db/0x600 fs/9p/vfs_inode.c:777 __lookup_hash+0x115/0x240 fs/namei.c:1601 filename_create+0x27b/0x500 fs/namei.c:3807 do_mkdirat+0xc5/0x560 fs/namei.c:4050 __do_sys_mkdir fs/namei.c:4080 [inline] __se_sys_mkdir fs/namei.c:4078 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4078 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 ffff88807c395f40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 7 bytes inside of 32-byte region [ffff88807c395f40, ffff88807c395f60) The buggy address belongs to the physical page: page:ffffea0001f0e540 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807c395040 pfn:0x7c395 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000073eec0 dead000000000004 ffff888012041500 raw: ffff88807c395040 000000008040003e 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 2983, tgid 2983 (udevd), ts 24711338305, free_ts 24673746347 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_slab_page+0x70/0xf0 mm/slub.c:1794 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+0x9e/0x1a0 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] shmem_initxattrs+0xd4/0x200 mm/shmem.c:3263 security_inode_init_security+0x3bf/0x3f0 security/security.c:1119 shmem_symlink+0x144/0x740 mm/shmem.c:3130 vfs_symlink+0x246/0x3d0 fs/namei.c:4400 do_symlinkat+0x209/0x610 fs/namei.c:4429 __do_sys_symlink fs/namei.c:4451 [inline] __se_sys_symlink fs/namei.c:4449 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4449 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 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] __kmem_cache_alloc_node+0x1d7/0x310 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 kvmalloc include/linux/slab.h:706 [inline] simple_xattr_alloc+0x3f/0xa0 fs/xattr.c:1008 shmem_initxattrs+0x8e/0x200 mm/shmem.c:3258 security_inode_init_security+0x3bf/0x3f0 security/security.c:1119 shmem_mknod+0xb0/0x1b0 mm/shmem.c:2915 lookup_open fs/namei.c:3413 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x12e2/0x2e00 fs/namei.c:3710 do_filp_open+0x275/0x500 fs/namei.c:3740 do_sys_openat2+0x13b/0x500 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1337 Memory state around the buggy address: ffff88807c395e00: fa fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc ffff88807c395e80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >ffff88807c395f00: 00 00 00 fc fc fc fc fc 00 00 06 fc fc fc fc fc ^ ffff88807c395f80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff88807c396000: fa fb fb fb fb fb fb fb fb 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