================================================================== BUG: KASAN: use-after-free in dev_map_enqueue+0x3c/0x340 kernel/bpf/devmap.c:529 Read of size 8 at addr ffff888028d45e80 by task syz.4.309/4593 CPU: 1 PID: 4593 Comm: syz.4.309 Not tainted 6.1.110-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 dev_map_enqueue+0x3c/0x340 kernel/bpf/devmap.c:529 __xdp_do_redirect_frame net/core/filter.c:4294 [inline] xdp_do_redirect_frame+0x323/0x660 net/core/filter.c:4356 xdp_test_run_batch net/bpf/test_run.c:314 [inline] bpf_test_run_xdp_live+0xbf4/0x1ea0 net/bpf/test_run.c:362 bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393 bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3685 __sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5038 __do_sys_bpf kernel/bpf/syscall.c:5124 [inline] __se_sys_bpf kernel/bpf/syscall.c:5122 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5122 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5537d7def9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5538a9f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f5537f36058 RCX: 00007f5537d7def9 RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a RBP: 00007f5537df0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5537f36058 R15: 00007ffe57984f08 Allocated by task 4402: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node+0xb3/0x230 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:583 [inline] bpf_map_kmalloc_node+0xce/0x1c0 kernel/bpf/syscall.c:452 __dev_map_alloc_node+0x56/0x4d0 kernel/bpf/devmap.c:848 __dev_map_hash_update_elem kernel/bpf/devmap.c:958 [inline] dev_map_hash_update_elem+0x322/0x7a0 kernel/bpf/devmap.c:992 bpf_map_update_value+0x5cf/0x6f0 kernel/bpf/syscall.c:226 map_update_elem+0x503/0x680 kernel/bpf/syscall.c:1463 __sys_bpf+0x337/0x6c0 kernel/bpf/syscall.c:5008 __do_sys_bpf kernel/bpf/syscall.c:5124 [inline] __se_sys_bpf kernel/bpf/syscall.c:5122 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5122 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888028d45e80 which belongs to the cache kmalloc-cg-96 of size 96 The buggy address is located 0 bytes inside of 96-byte region [ffff888028d45e80, ffff888028d45ee0) The buggy address belongs to the physical page: page:ffffea0000a35140 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888028d45880 pfn:0x28d45 memcg:ffff88807a07d801 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00016f3c00 dead000000000007 ffff888017c428c0 raw: ffff888028d45880 000000008020000b 00000001ffffffff ffff88807a07d801 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 3654, tgid 3654 (syz-executor), ts 82133376558, free_ts 82069250789 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2517 prep_new_page mm/page_alloc.c:2524 [inline] get_page_from_freelist+0x322e/0x33b0 mm/page_alloc.c:4290 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5558 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node+0xa2/0x230 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:583 [inline] kvmalloc_node+0x6e/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:710 [inline] alloc_fdtable+0x154/0x280 fs/file.c:137 dup_fd+0x89b/0xcb0 fs/file.c:350 copy_files+0xe6/0x200 kernel/fork.c:1636 copy_process+0x1873/0x4060 kernel/fork.c:2255 kernel_clone+0x222/0x920 kernel/fork.c:2682 __do_sys_clone kernel/fork.c:2823 [inline] __se_sys_clone kernel/fork.c:2807 [inline] __x64_sys_clone+0x231/0x280 kernel/fork.c:2807 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1444 [inline] free_pcp_prepare mm/page_alloc.c:1494 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3369 free_unref_page_list+0x663/0x900 mm/page_alloc.c:3510 release_pages+0x2836/0x2b40 mm/swap.c:1055 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu+0xfc/0x210 mm/mmu_gather.c:261 tlb_finish_mmu+0xce/0x1f0 mm/mmu_gather.c:361 exit_mmap+0x3c3/0x9f0 mm/mmap.c:3239 __mmput+0x115/0x3c0 kernel/fork.c:1199 exit_mm+0x226/0x300 kernel/exit.c:565 do_exit+0x9f6/0x26a0 kernel/exit.c:858 do_group_exit+0x202/0x2b0 kernel/exit.c:1021 get_signal+0x16f7/0x17d0 kernel/signal.c:2870 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 Memory state around the buggy address: ffff888028d45d80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888028d45e00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff888028d45e80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888028d45f00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888028d45f80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================