================================================================== BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline] BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline] BUG: KASAN: slab-out-of-bounds in l2cap_sock_setsockopt+0x22a6/0x2930 net/bluetooth/l2cap_sock.c:963 Read of size 4 at addr ffff88801f1c86e3 by task syz-executor.0/6109 CPU: 0 PID: 6109 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #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 copy_from_sockptr_offset include/linux/sockptr.h:49 [inline] copy_from_sockptr include/linux/sockptr.h:55 [inline] l2cap_sock_setsockopt+0x22a6/0x2930 net/bluetooth/l2cap_sock.c:963 do_sock_setsockopt+0x3af/0x720 net/socket.c:2311 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline] __se_sys_setsockopt net/socket.c:2340 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fa3d387de69 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:00007fa3d33ff0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fa3d39abf80 RCX: 00007fa3d387de69 RDX: 0000000000000007 RSI: 0000000000000112 RDI: 0000000000000004 RBP: 00007fa3d38ca47a R08: 0000000000000002 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fa3d39abf80 R15: 00007fff08a79388 Allocated by task 6109: 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:3966 [inline] __kmalloc+0x233/0x4a0 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] __cgroup_bpf_run_filter_setsockopt+0xd2f/0x1040 kernel/bpf/cgroup.c:1869 do_sock_setsockopt+0x6b4/0x720 net/socket.c:2293 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline] __se_sys_setsockopt net/socket.c:2340 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff88801f1c86e0 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 1 bytes to the right of allocated 2-byte region [ffff88801f1c86e0, ffff88801f1c86e2) The buggy address belongs to the physical page: page:ffffea00007c7200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f1c8 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c41280 ffffea0001e082c0 dead000000000002 raw: 0000000000000000 0000000080800080 00000001ffffffff 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5795, tgid 5792 (syz-executor.3), ts 86566049145, free_ts 86374473895 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x256/0x680 mm/page_alloc.c:4569 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x84/0x2f0 mm/slub.c:2391 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] __do_kmalloc_node mm/slub.c:3965 [inline] __kmalloc_node+0x2db/0x4e0 mm/slub.c:3973 kmalloc_node include/linux/slab.h:648 [inline] __vmalloc_area_node mm/vmalloc.c:3197 [inline] __vmalloc_node_range+0x5f9/0x14a0 mm/vmalloc.c:3392 __vmalloc_node mm/vmalloc.c:3457 [inline] __vmalloc+0x79/0x90 mm/vmalloc.c:3471 kvm_alloc_dirty_bitmap arch/x86/kvm/../../../virt/kvm/kvm_main.c:1457 [inline] kvm_prepare_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1711 [inline] kvm_set_memslot+0x4af/0x1280 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1950 __kvm_set_memory_region+0x90e/0xaf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2129 kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:2150 [inline] kvm_vm_ioctl_set_memory_region+0x6d/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2162 kvm_vm_ioctl+0xa45/0xd30 arch/x86/kvm/../../../virt/kvm/kvm_main.c:5152 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 page last free pid 5751 tgid 5751 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x95d/0xa80 mm/page_alloc.c:2346 free_unref_page_list+0x5a3/0x850 mm/page_alloc.c:2532 release_pages+0x2117/0x2400 mm/swap.c:1042 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline] tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu+0x34d/0x4e0 mm/mmu_gather.c:300 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:392 exit_mmap+0x4b6/0xd40 mm/mmap.c:3300 __mmput+0x115/0x3c0 kernel/fork.c:1345 exit_mm+0x220/0x310 kernel/exit.c:569 do_exit+0x99e/0x27e0 kernel/exit.c:865 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 __do_sys_exit_group kernel/exit.c:1038 [inline] __se_sys_exit_group kernel/exit.c:1036 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Memory state around the buggy address: ffff88801f1c8580: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ffff88801f1c8600: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc >ffff88801f1c8680: fa fc fc fc fa fc fc fc fa fc fc fc 02 fc fc fc ^ ffff88801f1c8700: 04 fc fc fc 04 fc fc fc 04 fc fc fc 04 fc fc fc ffff88801f1c8780: 04 fc fc fc 04 fc fc fc 04 fc fc fc 04 fc fc fc ==================================================================