================================================================== BUG: KASAN: slab-out-of-bounds in stack_map_get_build_id_offset+0x632/0x860 kernel/bpf/stackmap.c:188 Write of size 4 at addr ffff88807df93a40 by task udevd/3561 CPU: 0 PID: 3561 Comm: udevd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 stack_map_get_build_id_offset+0x632/0x860 kernel/bpf/stackmap.c:188 __bpf_get_stackid+0x55d/0x920 kernel/bpf/stackmap.c:294 ____bpf_get_stackid_raw_tp kernel/trace/bpf_trace.c:1465 [inline] bpf_get_stackid_raw_tp+0x175/0x1b0 kernel/trace/bpf_trace.c:1454 bpf_prog_b724608cae728045+0x1e/0x500 bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline] bpf_trace_run2+0x15b/0x2d0 kernel/trace/bpf_trace.c:1915 __bpf_trace_kfree+0x6e/0x90 include/trace/events/kmem.h:118 trace_kfree include/trace/events/kmem.h:118 [inline] kfree+0x25f/0x2a0 mm/slub.c:4554 tomoyo_path_perm+0x3e8/0x510 security/tomoyo/file.c:842 security_inode_getattr+0xcf/0x120 security/security.c:1348 vfs_getattr+0x26/0x3a0 fs/stat.c:157 vfs_fstat fs/stat.c:182 [inline] __do_sys_newfstat fs/stat.c:421 [inline] __se_sys_newfstat fs/stat.c:418 [inline] __x64_sys_newfstat+0x104/0x1d0 fs/stat.c:418 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fa519232ad7 Code: 73 01 c3 48 8b 0d 21 f3 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 05 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8 RSP: 002b:00007fffab056be8 EFLAGS: 00000297 ORIG_RAX: 0000000000000005 RAX: ffffffffffffffda RBX: 000056020a4a9f00 RCX: 00007fa519232ad7 RDX: 00007fa519310ea0 RSI: 00007fffab056bf0 RDI: 000000000000000c RBP: 00007fa519310ff0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000297 R12: 000000000000000a R13: 0000000000003fff R14: 0000000000000000 R15: 000056020a4a9f00 Allocated by task 5561: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc_node include/linux/slab.h:630 [inline] __bpf_map_area_alloc kernel/bpf/syscall.c:322 [inline] bpf_map_area_alloc+0x47/0xe0 kernel/bpf/syscall.c:335 prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:70 stack_map_alloc+0x3c9/0x570 kernel/bpf/stackmap.c:137 find_and_alloc_map kernel/bpf/syscall.c:129 [inline] map_create+0x485/0x2350 kernel/bpf/syscall.c:881 __sys_bpf+0x2a4/0x670 kernel/bpf/syscall.c:4639 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88807df93800 which belongs to the cache kmalloc-cg-1k of size 1024 The buggy address is located 576 bytes inside of 1024-byte region [ffff88807df93800, ffff88807df93c00) The buggy address belongs to the page: page:ffffea0001f7e400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7df90 head:ffffea0001f7e400 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88805ffe5201 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801684c000 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff88805ffe5201 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5044, ts 126312834552, free_ts 126290846598 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] __kmalloc_node+0x200/0x3b0 mm/slub.c:4456 kmalloc_node include/linux/slab.h:630 [inline] kvmalloc_node+0x84/0x130 mm/util.c:619 kvmalloc include/linux/mm.h:816 [inline] xt_alloc_table_info+0x37/0xa0 net/netfilter/x_tables.c:1192 ipt_register_table+0xb9/0x7e0 net/ipv4/netfilter/ip_tables.c:1736 iptable_security_table_init+0x3d/0x60 net/ipv4/netfilter/iptable_security.c:53 xt_find_table_lock+0x220/0x360 net/netfilter/x_tables.c:1259 xt_request_find_table_lock+0x22/0x100 net/netfilter/x_tables.c:1284 get_info net/ipv4/netfilter/ip_tables.c:964 [inline] do_ipt_get_ctl+0x6ed/0x1070 net/ipv4/netfilter/ip_tables.c:1660 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x115a/0x1590 net/ipv4/ip_sockglue.c:1797 tcp_getsockopt+0x1e3/0x2390 net/ipv4/tcp.c:4319 __sys_getsockopt+0x1b0/0x230 net/socket.c:2257 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 free_slab mm/slub.c:2020 [inline] discard_slab mm/slub.c:2026 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2512 put_cpu_partial+0x12d/0x190 mm/slub.c:2592 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc_trace+0x103/0x2a0 mm/slub.c:3250 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] binderfs_binder_device_create+0x16f/0xa80 drivers/android/binderfs.c:146 binderfs_fill_super+0xa92/0xea0 drivers/android/binderfs.c:726 vfs_get_super fs/super.c:1172 [inline] get_tree_nodev+0xb0/0x160 fs/super.c:1202 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3034 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3562 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88807df93900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807df93980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807df93a00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff88807df93a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807df93b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================