================================================================== BUG: KASAN: slab-out-of-bounds in instrument_copy_from_user_before include/linux/instrumented.h:129 [inline] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x7b/0xe0 lib/usercopy.c:22 Write of size 40 at addr ffff88801e7a1808 by task syz-executor.4/6220 CPU: 1 PID: 6220 Comm: syz-executor.4 Not tainted 6.9.0-rc2-next-20240402-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_copy_from_user_before include/linux/instrumented.h:129 [inline] _copy_from_user+0x7b/0xe0 lib/usercopy.c:22 copy_from_user include/linux/uaccess.h:183 [inline] handle_to_path fs/fhandle.c:203 [inline] do_handle_open+0x204/0x660 fs/fhandle.c:226 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a RIP: 0033:0x7f5e4847dde9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5e491490c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 RAX: ffffffffffffffda RBX: 00007f5e485abf80 RCX: 00007f5e4847dde9 RDX: 0000000000014000 RSI: 00000000200003c0 RDI: 0000000000000004 RBP: 00007f5e484ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f5e485abf80 R15: 00007ffcb9495a28 Allocated by task 6220: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4048 [inline] __kmalloc_noprof+0x200/0x410 mm/slub.c:4061 kmalloc_noprof include/linux/slab.h:664 [inline] handle_to_path fs/fhandle.c:195 [inline] do_handle_open+0x162/0x660 fs/fhandle.c:226 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a The buggy address belongs to the object at ffff88801e7a1800 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 8 bytes inside of allocated 40-byte region [ffff88801e7a1800, ffff88801e7a1828) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e7a1 flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000000 ffff888015041640 ffffea0000a5f280 dead000000000004 raw: 0000000000000000 0000000080200020 00000001ffffefff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5655, tgid 2099165805 (syz-executor.3), ts 5659, free_ts 83686374856 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1490 prep_new_page mm/page_alloc.c:1498 [inline] get_page_from_freelist+0x2e7e/0x2f40 mm/page_alloc.c:3454 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4712 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2249 allocate_slab+0x5a/0x2e0 mm/slub.c:2412 new_slab mm/slub.c:2465 [inline] ___slab_alloc+0xea8/0x1430 mm/slub.c:3599 __slab_alloc+0x58/0xa0 mm/slub.c:3684 __slab_alloc_node mm/slub.c:3737 [inline] slab_alloc_node mm/slub.c:3915 [inline] kmalloc_trace_noprof+0x1d5/0x2b0 mm/slub.c:4074 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:775 [inline] sctp_add_bind_addr+0x89/0x3a0 net/sctp/bind_addr.c:150 sctp_copy_local_addr_list+0x311/0x500 net/sctp/protocol.c:165 sctp_bind_addr_copy+0xad/0x3b0 net/sctp/bind_addr.c:56 sctp_connect_new_asoc+0x2f3/0x6c0 net/sctp/socket.c:1095 __sctp_connect+0x66d/0xe30 net/sctp/socket.c:1197 __sctp_setsockopt_connectx net/sctp/socket.c:1336 [inline] sctp_getsockopt_connectx3+0x46f/0x730 net/sctp/socket.c:1421 sctp_getsockopt+0x8de/0xbb0 net/sctp/socket.c:8127 do_sock_getsockopt+0x373/0x850 net/socket.c:2373 page last free pid 5661 tgid 5660 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1110 [inline] free_unref_folios+0xf23/0x19e0 mm/page_alloc.c:2666 folios_put_refs+0x93a/0xa60 mm/swap.c:1034 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:332 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 unmap_region+0x2df/0x350 mm/mmap.c:2360 do_vmi_align_munmap+0x1122/0x18c0 mm/mmap.c:2673 do_vmi_munmap+0x24e/0x2d0 mm/mmap.c:2741 __vm_munmap+0x1fc/0x400 mm/mmap.c:3017 __do_sys_munmap mm/mmap.c:3034 [inline] __se_sys_munmap mm/mmap.c:3031 [inline] __x64_sys_munmap+0x68/0x80 mm/mmap.c:3031 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a Memory state around the buggy address: ffff88801e7a1700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801e7a1780: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88801e7a1800: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88801e7a1880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801e7a1900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================