================================================================== BUG: KASAN: slab-use-after-free in bq_enqueue kernel/bpf/cpumap.c:710 [inline] BUG: KASAN: slab-use-after-free in cpu_map_enqueue+0x33b/0x3b0 kernel/bpf/cpumap.c:736 Read of size 8 at addr ffff8880481a1208 by task syz.2.3543/14414 CPU: 2 PID: 14414 Comm: syz.2.3543 Not tainted 6.10.0-rc7-syzkaller-00076-g9d9a2f29aefd #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 bq_enqueue kernel/bpf/cpumap.c:710 [inline] cpu_map_enqueue+0x33b/0x3b0 kernel/bpf/cpumap.c:736 __xdp_do_redirect_frame net/core/filter.c:4406 [inline] xdp_do_redirect+0x72e/0xb10 net/core/filter.c:4442 tun_xdp_act+0xd3/0xc30 drivers/net/tun.c:1626 tun_build_skb.constprop.0+0xd7c/0x1250 drivers/net/tun.c:1716 tun_get_user+0x888/0x3c30 drivers/net/tun.c:1819 tun_chr_write_iter+0xe8/0x210 drivers/net/tun.c:2048 new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6b6/0x1140 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f127f57475f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 8c 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 7c 8c 02 00 48 RSP: 002b:00007f12803a3010 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f127f703f60 RCX: 00007f127f57475f RDX: 000000000000000e RSI: 0000000020001540 RDI: 00000000000000c8 RBP: 00007f127f5e4e60 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000000e R11: 0000000000000293 R12: 0000000000000000 R13: 000000000000000b R14: 00007f127f703f60 R15: 00007fff84e65848 Allocated by task 13957: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:660 [inline] kmalloc_array_noprof include/linux/slab.h:698 [inline] kvm_arch_vcpu_create+0x36a/0xaa0 arch/x86/kvm/x86.c:12175 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:4245 [inline] kvm_vm_ioctl+0xf77/0x3de0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:5087 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 13956: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4438 [inline] kfree+0x12a/0x3b0 mm/slub.c:4559 kvm_arch_vcpu_destroy+0x108/0x2a0 arch/x86/kvm/x86.c:12278 kvm_vcpu_destroy arch/x86/kvm/../../../virt/kvm/kvm_main.c:511 [inline] kvm_destroy_vcpus+0x114/0x2a0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:531 kvm_arch_destroy_vm+0x2ec/0x490 arch/x86/kvm/x86.c:12778 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1345 [inline] kvm_put_kvm+0x510/0xb80 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1381 kvm_vm_release+0x42/0x60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1404 __fput+0x408/0xbb0 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x275/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880481a1200 which belongs to the cache kmalloc-cg-256 of size 256 The buggy address is located 8 bytes inside of freed 256-byte region [ffff8880481a1200, ffff8880481a1300) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880481a0000 pfn:0x481a0 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88802ba7b501 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff88801544dcc0 dead000000000122 0000000000000000 raw: ffff8880481a0000 000000008010000f 00000001ffffefff ffff88802ba7b501 head: 00fff00000000040 ffff88801544dcc0 dead000000000122 0000000000000000 head: ffff8880481a0000 000000008010000f 00000001ffffefff ffff88802ba7b501 head: 00fff00000000001 ffffea0001206801 ffffffffffffffff 0000000000000000 head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 9264, tgid 9259 (syz.3.1554), ts 187687736540, free_ts 187646811035 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1473 prep_new_page mm/page_alloc.c:1481 [inline] get_page_from_freelist+0x1353/0x2e50 mm/page_alloc.c:3425 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4683 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x56/0x110 mm/slub.c:2265 allocate_slab mm/slub.c:2428 [inline] new_slab+0x84/0x260 mm/slub.c:2481 ___slab_alloc+0xdac/0x1870 mm/slub.c:3667 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3990 [inline] kmalloc_trace_noprof+0x2b4/0x300 mm/slub.c:4149 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] fuse_file_alloc+0x51/0x2d0 fs/fuse/file.c:58 fuse_file_open+0x197/0x780 fs/fuse/file.c:134 fuse_do_open fs/fuse/file.c:175 [inline] fuse_open+0x1e8/0x920 fs/fuse/file.c:264 do_dentry_open+0x91f/0x15f0 fs/open.c:955 vfs_open+0x82/0x3f0 fs/open.c:1086 do_open fs/namei.c:3654 [inline] path_openat+0x21fc/0x2e50 fs/namei.c:3813 do_filp_open+0x1dc/0x430 fs/namei.c:3840 do_sys_openat2+0x17a/0x1e0 fs/open.c:1413 page last free pid 4690 tgid 4690 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1093 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2588 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3940 [inline] slab_alloc_node mm/slub.c:4002 [inline] __do_kmalloc_node mm/slub.c:4122 [inline] __kmalloc_noprof+0x19d/0x410 mm/slub.c:4136 kmalloc_noprof include/linux/slab.h:664 [inline] tomoyo_realpath_from_path+0xb9/0x720 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x273/0x450 security/tomoyo/file.c:822 security_inode_getattr+0xf4/0x160 security/security.c:2269 vfs_getattr fs/stat.c:173 [inline] vfs_fstat+0x53/0xd0 fs/stat.c:198 vfs_fstatat+0x134/0x150 fs/stat.c:300 __do_sys_newfstatat+0xa6/0x130 fs/stat.c:468 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880481a1100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880481a1180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880481a1200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880481a1280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880481a1300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================