================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_from_iter lib/iov_iter.c:73 [inline] BUG: KASAN: slab-out-of-bounds in iterate_bvec include/linux/iov_iter.h:122 [inline] BUG: KASAN: slab-out-of-bounds in iterate_and_advance2 include/linux/iov_iter.h:249 [inline] BUG: KASAN: slab-out-of-bounds in iterate_and_advance include/linux/iov_iter.h:271 [inline] BUG: KASAN: slab-out-of-bounds in __copy_from_iter lib/iov_iter.c:268 [inline] BUG: KASAN: slab-out-of-bounds in copy_page_from_iter_atomic+0x9b9/0x1e80 lib/iov_iter.c:500 Read of size 1024 at addr ffff888017f55c00 by task kworker/u8:6/1084 CPU: 0 PID: 1084 Comm: kworker/u8:6 Not tainted 6.8.0-rc4-next-20240214-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: loop0 loop_rootcg_workfn Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 memcpy_from_iter lib/iov_iter.c:73 [inline] iterate_bvec include/linux/iov_iter.h:122 [inline] iterate_and_advance2 include/linux/iov_iter.h:249 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] __copy_from_iter lib/iov_iter.c:268 [inline] copy_page_from_iter_atomic+0x9b9/0x1e80 lib/iov_iter.c:500 generic_perform_write+0x39b/0x640 mm/filemap.c:3929 shmem_file_write_iter+0xfc/0x120 mm/shmem.c:2893 do_iter_readv_writev+0x5a4/0x800 vfs_iter_write+0x244/0x5d0 fs/read_write.c:895 lo_write_bvec drivers/block/loop.c:246 [inline] lo_write_simple drivers/block/loop.c:267 [inline] do_req_filebacked drivers/block/loop.c:491 [inline] loop_handle_cmd drivers/block/loop.c:1907 [inline] loop_process_work+0x13a3/0x1e60 drivers/block/loop.c:1942 process_one_work kernel/workqueue.c:3146 [inline] process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3226 worker_thread+0x86d/0xd70 kernel/workqueue.c:3307 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242 Allocated by task 5066: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3982 [inline] __kmalloc+0x231/0x4a0 mm/slub.c:3995 kmalloc include/linux/slab.h:594 [inline] hfsplus_read_wrapper+0x545/0x1340 fs/hfsplus/wrapper.c:179 hfsplus_fill_super+0x38e/0x1ca0 fs/hfsplus/super.c:413 mount_bdev+0x20a/0x2d0 fs/super.c:1663 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1784 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff888017f55c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of allocated 512-byte region [ffff888017f55c00, ffff888017f55e00) The buggy address belongs to the physical page: page:ffffea00005fd500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17f54 head:ffffea00005fd500 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000840 ffff888014c41c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4521, tgid 4521 (udevd), ts 22926487811, free_ts 20512257182 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x256/0x6a0 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2191 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xc73/0x1260 mm/slub.c:3541 __slab_alloc mm/slub.c:3626 [inline] __slab_alloc_node mm/slub.c:3679 [inline] slab_alloc_node mm/slub.c:3851 [inline] kmalloc_trace+0x267/0x360 mm/slub.c:4008 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] kernfs_fop_open+0x3e4/0xcd0 fs/kernfs/file.c:623 do_dentry_open+0x907/0x15a0 fs/open.c:956 do_open fs/namei.c:3639 [inline] path_openat+0x2860/0x3240 fs/namei.c:3796 do_filp_open+0x235/0x490 fs/namei.c:3823 do_sys_openat2+0x13e/0x1d0 fs/open.c:1407 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1433 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 page last free pid 4535 tgid 4535 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 discard_slab mm/slub.c:2453 [inline] __put_partials+0xeb/0x130 mm/slub.c:2922 put_cpu_partial+0x17c/0x250 mm/slub.c:2997 __slab_free+0x2e8/0x3d0 mm/slub.c:4167 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3814 [inline] slab_alloc_node mm/slub.c:3861 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc+0x1e0/0x4a0 mm/slub.c:3995 kmalloc include/linux/slab.h:594 [inline] kernfs_fop_write_iter+0x15b/0x500 fs/kernfs/file.c:311 call_write_iter include/linux/fs.h:2117 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa84/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Memory state around the buggy address: ffff888017f55d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888017f55d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888017f55e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888017f55e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888017f55f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================