===================================================== 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:302 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:330 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0xef3/0x33f0 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:302 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] _copy_to_iter+0xef3/0x33f0 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:2763 blkdev_read_iter+0x89f/0xb00 block/fops.c:849 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x8ea/0xf90 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+0x2f9c/0x3e20 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:306 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] _copy_to_iter+0x130f/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:3476 lo_rw_aio+0x1265/0x1590 drivers/block/loop.c:-1 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1913 [inline] loop_process_work+0xe30/0x1ec0 drivers/block/loop.c:1948 loop_rootcg_workfn+0x2b/0x40 drivers/block/loop.c:1979 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3319 worker_thread+0xedf/0x1590 kernel/workqueue.c:3400 kthread+0xd59/0xf00 kernel/kthread.c:463 ret_from_fork+0x1e3/0x310 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:306 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] copy_folio_from_iter_atomic+0x11f7/0x3c20 lib/iov_iter.c:479 generic_perform_write+0x8b1/0x1050 mm/filemap.c:4193 shmem_file_write_iter+0x2b7/0x2f0 mm/shmem.c:3528 lo_rw_aio+0x1265/0x1590 drivers/block/loop.c:-1 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1913 [inline] loop_process_work+0xe30/0x1ec0 drivers/block/loop.c:1948 loop_rootcg_workfn+0x2b/0x40 drivers/block/loop.c:1979 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3319 worker_thread+0xedf/0x1590 kernel/workqueue.c:3400 kthread+0xd59/0xf00 kernel/kthread.c:463 ret_from_fork+0x1e3/0x310 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_to_page include/linux/highmem.h:454 [inline] hfsplus_bnode_write+0x290/0xa10 fs/hfsplus/bnode.c:159 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+0x8eb/0xb30 fs/namei.c:4854 do_linkat+0x4af/0x1040 fs/namei.c:4924 __do_sys_link fs/namei.c:4958 [inline] __se_sys_link fs/namei.c:4956 [inline] __x64_sys_link+0xd7/0x140 fs/namei.c:4956 x64_sys_call+0x162f/0x3e20 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+0x8eb/0xb30 fs/namei.c:4854 do_linkat+0x4af/0x1040 fs/namei.c:4924 __do_sys_link fs/namei.c:4958 [inline] __se_sys_link fs/namei.c:4956 [inline] __x64_sys_link+0xd7/0x140 fs/namei.c:4956 x64_sys_call+0x162f/0x3e20 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:5171 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416 alloc_frozen_pages_noprof+0xf7/0x200 mm/mempolicy.c:2487 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab+0x24d/0x1220 mm/slub.c:2655 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0x1024/0x34e0 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] kmem_cache_alloc_lru_noprof+0x922/0xed0 mm/slub.c:4248 hfsplus_alloc_inode+0x5a/0xd0 fs/hfsplus/super.c:625 alloc_inode+0x8a/0x4a0 fs/inode.c:346 iget_locked+0x239/0x12d0 fs/inode.c:1438 hfsplus_iget+0x5c/0xb80 fs/hfsplus/super.c:65 hfsplus_lookup+0xd5f/0xf70 fs/hfsplus/dir.c:118 __lookup_slow+0x560/0x760 fs/namei.c:1808 lookup_slow+0x6a/0xd0 fs/namei.c:1825 walk_component+0x444/0x650 fs/namei.c:2129 lookup_last fs/namei.c:2630 [inline] path_lookupat+0x251/0x6b0 fs/namei.c:2654 filename_lookup+0x2bd/0x800 fs/namei.c:2683 do_linkat+0x14e/0x1040 fs/namei.c:4904 __do_sys_link fs/namei.c:4958 [inline] __se_sys_link fs/namei.c:4956 [inline] __x64_sys_link+0xd7/0x140 fs/namei.c:4956 x64_sys_call+0x162f/0x3e20 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 Bytes 34-37 of 3072 are uninitialized Memory access of size 3072 starts at ffff88804046d000 Data copied to user address 00007fa474146400 CPU: 1 UID: 0 PID: 7215 Comm: udevd Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 =====================================================