===================================================== 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:29 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:245 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:271 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x366/0x2520 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:29 [inline] iterate_and_advance2 include/linux/iov_iter.h:245 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] _copy_to_iter+0x366/0x2520 lib/iov_iter.c:185 copy_page_to_iter+0x419/0x870 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:180 [inline] filemap_read+0xbf4/0x14d0 mm/filemap.c:2654 blkdev_read_iter+0x6c0/0x8e0 block/fops.c:757 call_read_iter include/linux/fs.h:2081 [inline] new_sync_read fs/read_write.c:395 [inline] vfs_read+0xd8a/0xed0 fs/read_write.c:476 ksys_read+0x20f/0x4c0 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __x64_sys_read+0x93/0xd0 fs/read_write.c:627 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was stored to memory at: memcpy_to_iter lib/iov_iter.c:65 [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_to_iter+0xe43/0x2520 lib/iov_iter.c:185 copy_page_to_iter+0x419/0x870 lib/iov_iter.c:362 shmem_file_read_iter+0xa0a/0x12b0 mm/shmem.c:2839 do_iter_readv_writev+0x655/0x7a0 vfs_iter_read+0x275/0x6f0 fs/read_write.c:830 lo_read_simple drivers/block/loop.c:286 [inline] do_req_filebacked drivers/block/loop.c:496 [inline] loop_handle_cmd drivers/block/loop.c:1909 [inline] loop_process_work+0x204a/0x3430 drivers/block/loop.c:1944 loop_rootcg_workfn+0x2b/0x30 drivers/block/loop.c:1975 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x1132/0x1f40 kernel/workqueue.c:2706 worker_thread+0xea4/0x1560 kernel/workqueue.c:2787 kthread+0x3ed/0x550 kernel/kthread.c:388 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:243 Uninit was stored to memory at: 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:249 [inline] copy_page_from_iter_atomic+0x12b2/0x2b60 lib/iov_iter.c:481 generic_perform_write+0x4ae/0xc40 mm/filemap.c:3938 shmem_file_write_iter+0x2b5/0x2e0 mm/shmem.c:2893 do_iter_readv_writev+0x655/0x7a0 vfs_iter_write+0x455/0xd00 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:1909 [inline] loop_process_work+0x14f9/0x3430 drivers/block/loop.c:1944 loop_rootcg_workfn+0x2b/0x30 drivers/block/loop.c:1975 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x1132/0x1f40 kernel/workqueue.c:2706 worker_thread+0xea4/0x1560 kernel/workqueue.c:2787 kthread+0x3ed/0x550 kernel/kthread.c:388 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:243 Uninit was stored to memory at: memcpy_to_page include/linux/highmem.h:427 [inline] hfsplus_bnode_write+0xee/0x2e0 fs/hfsplus/bnode.c:83 hfsplus_brec_insert+0xa9d/0x1400 fs/hfsplus/brec.c:133 hfsplus_create_cat+0x1309/0x1810 fs/hfsplus/catalog.c:308 hfsplus_link+0x7de/0xc00 fs/hfsplus/dir.c:342 vfs_link+0x936/0xb60 fs/namei.c:4608 do_linkat+0x6e1/0x1160 fs/namei.c:4679 __do_sys_link fs/namei.c:4713 [inline] __se_sys_link fs/namei.c:4711 [inline] __x64_sys_link+0xec/0x140 fs/namei.c:4711 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was stored to memory at: hfsplus_cat_build_record fs/hfsplus/catalog.c:167 [inline] hfsplus_create_cat+0x11d1/0x1810 fs/hfsplus/catalog.c:300 hfsplus_link+0x7de/0xc00 fs/hfsplus/dir.c:342 vfs_link+0x936/0xb60 fs/namei.c:4608 do_linkat+0x6e1/0x1160 fs/namei.c:4679 __do_sys_link fs/namei.c:4713 [inline] __se_sys_link fs/namei.c:4711 [inline] __x64_sys_link+0xec/0x140 fs/namei.c:4711 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was created at: __alloc_pages+0x9a6/0xe00 mm/page_alloc.c:4592 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0x2d7/0x1400 mm/slub.c:2407 ___slab_alloc+0x16b5/0x3970 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmem_cache_alloc_lru+0x64d/0xb30 mm/slub.c:3879 alloc_inode_sb include/linux/fs.h:3018 [inline] hfsplus_alloc_inode+0x5a/0xc0 fs/hfsplus/super.c:633 alloc_inode+0x83/0x440 fs/inode.c:260 iget_locked+0x2c2/0xef0 fs/inode.c:1278 hfsplus_iget+0x59/0xaf0 fs/hfsplus/super.c:64 hfsplus_btree_open+0x13e/0x1d00 fs/hfsplus/btree.c:150 hfsplus_fill_super+0x1113/0x26f0 fs/hfsplus/super.c:479 mount_bdev+0x38f/0x510 fs/super.c:1658 hfsplus_mount+0x4d/0x60 fs/hfsplus/super.c:647 legacy_get_tree+0x110/0x290 fs/fs_context.c:662 vfs_get_tree+0xa5/0x560 fs/super.c:1779 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352 path_mount+0x73d/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x725/0x810 fs/namespace.c:3875 __x64_sys_mount+0xe4/0x140 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Bytes 3258-3261 of 4096 are uninitialized Memory access of size 4096 starts at ffff888118bf8000 Data copied to user address 0000557df4acb168 CPU: 1 PID: 5031 Comm: udevd Not tainted 6.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 =====================================================