================================================================== BUG: KFENCE: out-of-bounds read in memcpy_orig+0x1e/0x140 arch/x86/lib/memcpy_64.S:60 Out-of-bounds read at 0xffff88823bd03000 (512B right of kfence-#128): memcpy_orig+0x1e/0x140 arch/x86/lib/memcpy_64.S:60 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+0x910/0x11c0 lib/iov_iter.c:500 generic_perform_write+0x2ee/0x620 mm/filemap.c:3938 shmem_file_write_iter+0x114/0x140 mm/shmem.c:2893 call_write_iter include/linux/fs.h:2085 [inline] do_iter_readv_writev+0x41b/0x660 fs/read_write.c:741 vfs_iter_write+0x1eb/0x990 fs/read_write.c:895 lo_write_bvec drivers/block/loop.c:248 [inline] lo_write_simple drivers/block/loop.c:269 [inline] do_req_filebacked drivers/block/loop.c:493 [inline] loop_handle_cmd drivers/block/loop.c:1911 [inline] loop_process_work+0x1577/0x20c0 drivers/block/loop.c:1946 process_one_work+0x8a7/0x1600 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b6/0x1290 kernel/workqueue.c:2787 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242 kfence-#128: 0xffff88823bd02e00-0xffff88823bd02fff, size=512, cache=kmalloc-512 allocated by task 5470 on cpu 0 at 238.967185s: kmalloc include/linux/slab.h:594 [inline] hfsplus_read_wrapper+0x37d/0x1070 fs/hfsplus/wrapper.c:179 hfsplus_fill_super+0x352/0x1bc0 fs/hfsplus/super.c:413 mount_bdev+0x1e3/0x2d0 fs/super.c:1663 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1784 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 CPU: 1 PID: 2474 Comm: kworker/u4:7 Not tainted 6.7.0-next-20240112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: loop0 loop_rootcg_workfn RIP: 0010:memcpy_orig+0x1e/0x140 arch/x86/lib/memcpy_64.S:65 Code: 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 89 f8 48 83 fa 20 0f 82 86 00 00 00 40 38 fe 7c 35 48 83 ea 20 48 83 ea 20 <4c> 8b 06 4c 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 48 8d 76 20 4c 89 07 RSP: 0018:ffffc9000a9cf700 EFLAGS: 00010206 RAX: ffff888076c70200 RBX: ffffc9000a9cfbd8 RCX: ffff888000000000 RDX: 00000000000005c0 RSI: ffff88823bd03000 RDI: ffff888076c70200 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000002 R10: 0000000000000002 R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc9000a9cfbe0 R15: 0000000000000600 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823bd03000 CR3: 0000000025c96000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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+0x910/0x11c0 lib/iov_iter.c:500 generic_perform_write+0x2ee/0x620 mm/filemap.c:3938 shmem_file_write_iter+0x114/0x140 mm/shmem.c:2893 call_write_iter include/linux/fs.h:2085 [inline] do_iter_readv_writev+0x41b/0x660 fs/read_write.c:741 vfs_iter_write+0x1eb/0x990 fs/read_write.c:895 lo_write_bvec drivers/block/loop.c:248 [inline] lo_write_simple drivers/block/loop.c:269 [inline] do_req_filebacked drivers/block/loop.c:493 [inline] loop_handle_cmd drivers/block/loop.c:1911 [inline] loop_process_work+0x1577/0x20c0 drivers/block/loop.c:1946 process_one_work+0x8a7/0x1600 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b6/0x1290 kernel/workqueue.c:2787 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242 ================================================================== ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 66 0f 1f 00 nopw (%rax) 10: 48 89 f8 mov %rdi,%rax 13: 48 83 fa 20 cmp $0x20,%rdx 17: 0f 82 86 00 00 00 jb 0xa3 1d: 40 38 fe cmp %dil,%sil 20: 7c 35 jl 0x57 22: 48 83 ea 20 sub $0x20,%rdx 26: 48 83 ea 20 sub $0x20,%rdx * 2a: 4c 8b 06 mov (%rsi),%r8 <-- trapping instruction 2d: 4c 8b 4e 08 mov 0x8(%rsi),%r9 31: 4c 8b 56 10 mov 0x10(%rsi),%r10 35: 4c 8b 5e 18 mov 0x18(%rsi),%r11 39: 48 8d 76 20 lea 0x20(%rsi),%rsi 3d: 4c 89 07 mov %r8,(%rdi)