================================================================== BUG: KFENCE: out-of-bounds read in memcpy_orig+0x1e/0x120 arch/x86/lib/memcpy_64.S:60 Out-of-bounds read at 0xffff88823bc25000 (512B right of kfence-#17): memcpy_orig+0x1e/0x120 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+0x90e/0x11c0 lib/iov_iter.c:500 generic_perform_write+0x2e9/0x600 mm/filemap.c:3926 shmem_file_write_iter+0x110/0x140 mm/shmem.c:2878 call_write_iter include/linux/fs.h:2020 [inline] do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735 do_iter_write+0x17f/0x7f0 fs/read_write.c:860 vfs_iter_write+0x7a/0xb0 fs/read_write.c:901 lo_write_bvec drivers/block/loop.c:249 [inline] lo_write_simple drivers/block/loop.c:271 [inline] do_req_filebacked drivers/block/loop.c:495 [inline] loop_handle_cmd drivers/block/loop.c:1915 [inline] loop_process_work+0x1693/0x2610 drivers/block/loop.c:1950 process_one_work+0x886/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 kfence-#17: 0xffff88823bc24e00-0xffff88823bc24fff, size=512, cache=kmalloc-512 allocated by task 5172 on cpu 1 at 155.282626s: kmalloc include/linux/slab.h:604 [inline] hfsplus_read_wrapper+0x37d/0x1070 fs/hfsplus/wrapper.c:178 hfsplus_fill_super+0x352/0x1bc0 fs/hfsplus/super.c:413 mount_bdev+0x1f3/0x2e0 fs/super.c:1650 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8c/0x370 fs/super.c:1771 do_new_mount fs/namespace.c:3337 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3664 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount fs/namespace.c:3863 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3863 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b CPU: 0 PID: 1044 Comm: kworker/u4:6 Not tainted 6.7.0-rc4-syzkaller-00009-gbee0e7762ad2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: loop0 loop_rootcg_workfn RIP: 0010:memcpy_orig+0x1e/0x120 arch/x86/lib/memcpy_64.S:65 Code: eb 0a 48 89 f8 48 89 d1 f3 a4 c3 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:ffffc9000468f690 EFLAGS: 00010206 RAX: ffff88807266c200 RBX: ffffc9000468fbe8 RCX: ffff888000000000 RDX: 00000000000005c0 RSI: ffff88823bc25000 RDI: ffff88807266c200 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000002 R10: 0000000000000002 R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc9000468fbf0 R15: 0000000000000600 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823bc25000 CR3: 00000000206a2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> 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+0x90e/0x11c0 lib/iov_iter.c:500 generic_perform_write+0x2e9/0x600 mm/filemap.c:3926 shmem_file_write_iter+0x110/0x140 mm/shmem.c:2878 call_write_iter include/linux/fs.h:2020 [inline] do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735 do_iter_write+0x17f/0x7f0 fs/read_write.c:860 vfs_iter_write+0x7a/0xb0 fs/read_write.c:901 lo_write_bvec drivers/block/loop.c:249 [inline] lo_write_simple drivers/block/loop.c:271 [inline] do_req_filebacked drivers/block/loop.c:495 [inline] loop_handle_cmd drivers/block/loop.c:1915 [inline] loop_process_work+0x1693/0x2610 drivers/block/loop.c:1950 process_one_work+0x886/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 </TASK> ================================================================== ---------------- Code disassembly (best guess): 0: eb 0a jmp 0xc 2: 48 89 f8 mov %rdi,%rax 5: 48 89 d1 mov %rdx,%rcx 8: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) a: c3 ret 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)