===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline] BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:30 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:300 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:328 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0xf0e/0x33f0 lib/iov_iter.c:185 instrument_copy_to_user include/linux/instrumented.h:114 [inline] copy_to_user_iter lib/iov_iter.c:24 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0xf0e/0x33f0 lib/iov_iter.c:185 copy_page_to_iter+0x482/0x910 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:204 [inline] filemap_read+0x1cda/0x2300 mm/filemap.c:2762 blkdev_read_iter+0x89f/0xb00 block/fops.c:833 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x857/0xf00 fs/read_write.c:572 ksys_read fs/read_write.c:715 [inline] __do_sys_read fs/read_write.c:724 [inline] __se_sys_read fs/read_write.c:722 [inline] __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722 x64_sys_call+0x39db/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: memcpy_to_iter lib/iov_iter.c:65 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:304 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0x1324/0x33f0 lib/iov_iter.c:185 copy_page_to_iter+0x482/0x910 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:204 [inline] shmem_file_read_iter+0x904/0x1140 mm/shmem.c:3415 lo_rw_aio+0x12d7/0x1610 drivers/block/loop.c:-1 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1889 [inline] loop_process_work+0xe30/0x1ee0 drivers/block/loop.c:1924 loop_rootcg_workfn+0x2b/0x40 drivers/block/loop.c:1955 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3321 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402 kthread+0xd5c/0xf00 kernel/kthread.c:464 ret_from_fork+0x1e0/0x310 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was stored to memory at: memcpy_from_iter lib/iov_iter.c:73 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:304 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] copy_folio_from_iter_atomic+0x18f2/0x3c10 lib/iov_iter.c:479 generic_perform_write+0x8eb/0x10c0 mm/filemap.c:4130 shmem_file_write_iter+0x2b7/0x2f0 mm/shmem.c:3467 lo_rw_aio+0x12d7/0x1610 drivers/block/loop.c:-1 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1889 [inline] loop_process_work+0xe30/0x1ee0 drivers/block/loop.c:1924 loop_rootcg_workfn+0x2b/0x40 drivers/block/loop.c:1955 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3321 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402 kthread+0xd5c/0xf00 kernel/kthread.c:464 ret_from_fork+0x1e0/0x310 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was stored to memory at: hfsplus_bnode_move+0x1539/0x1be0 fs/hfsplus/bnode.c:284 hfsplus_brec_remove+0x8d6/0xa60 fs/hfsplus/brec.c:226 hfsplus_delete_cat+0xf0e/0x13d0 fs/hfsplus/catalog.c:413 hfsplus_unlink+0x526/0xd70 fs/hfsplus/dir.c:385 vfs_unlink+0x613/0xab0 fs/namei.c:4595 do_unlinkat+0x6e6/0xe50 fs/namei.c:4659 __do_sys_unlink fs/namei.c:4705 [inline] __se_sys_unlink fs/namei.c:4703 [inline] __x64_sys_unlink+0x71/0xb0 fs/namei.c:4703 x64_sys_call+0x29de/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:88 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: memcpy_to_page include/linux/highmem.h:460 [inline] hfsplus_bnode_write+0x158/0x430 fs/hfsplus/bnode.c:89 hfsplus_brec_insert+0xaec/0x1540 fs/hfsplus/brec.c:133 hfsplus_create_cat+0x1396/0x1910 fs/hfsplus/catalog.c:308 hfsplus_link+0x79e/0xc30 fs/hfsplus/dir.c:342 vfs_link+0x8e8/0xb30 fs/namei.c:4863 do_linkat+0x4af/0x1040 fs/namei.c:4933 __do_sys_link fs/namei.c:4967 [inline] __se_sys_link fs/namei.c:4965 [inline] __x64_sys_link+0xd7/0x140 fs/namei.c:4965 x64_sys_call+0x3567/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:87 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: hfsplus_cat_build_record fs/hfsplus/catalog.c:167 [inline] hfsplus_create_cat+0x1748/0x1910 fs/hfsplus/catalog.c:300 hfsplus_link+0x79e/0xc30 fs/hfsplus/dir.c:342 vfs_link+0x8e8/0xb30 fs/namei.c:4863 do_linkat+0x4af/0x1040 fs/namei.c:4933 __do_sys_link fs/namei.c:4967 [inline] __se_sys_link fs/namei.c:4965 [inline] __x64_sys_link+0xd7/0x140 fs/namei.c:4965 x64_sys_call+0x3567/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:87 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:4982 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2419 alloc_frozen_pages_noprof+0xf7/0x200 mm/mempolicy.c:2490 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab+0x24d/0x1220 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xfec/0x3480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] kmem_cache_alloc_lru_noprof+0x922/0xed0 mm/slub.c:4216 hfsplus_alloc_inode+0x5a/0xd0 fs/hfsplus/super.c:627 alloc_inode+0x87/0x4a0 fs/inode.c:346 iget_locked+0x239/0x12d0 fs/inode.c:1439 hfsplus_iget+0x5c/0xb80 fs/hfsplus/super.c:65 hfsplus_btree_open+0x134/0x1d00 fs/hfsplus/btree.c:150 hfsplus_fill_super+0x1161/0x2740 fs/hfsplus/super.c:474 get_tree_bdev_flags+0x6e6/0x920 fs/super.c:1681 get_tree_bdev+0x38/0x50 fs/super.c:1704 hfsplus_get_tree+0x35/0x40 fs/hfsplus/super.c:640 vfs_get_tree+0xb3/0x5c0 fs/super.c:1804 do_new_mount+0x738/0x1610 fs/namespace.c:3902 path_mount+0x6db/0x1e90 fs/namespace.c:4226 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x6eb/0x7d0 fs/namespace.c:4427 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4427 x64_sys_call+0xfa7/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Bytes 444-447 of 3072 are uninitialized Memory access of size 3072 starts at ffff8880a653c000 Data copied to user address 00007f7915a23400 CPU: 1 UID: 0 PID: 6043 Comm: udevd Not tainted 6.16.0-rc4-syzkaller-00308-ga79a588fc176 #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 =====================================================