================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x677/0xcf0 kernel/bpf/stackmap.c:265 Write of size 8 at addr ffff888063b94658 by task syz.7.870/8432 CPU: 0 UID: 0 PID: 8432 Comm: syz.7.870 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __bpf_get_stackid+0x677/0xcf0 kernel/bpf/stackmap.c:265 ____bpf_get_stackid_raw_tp kernel/trace/bpf_trace.c:1810 [inline] bpf_get_stackid_raw_tp+0x196/0x210 kernel/trace/bpf_trace.c:1799 bpf_prog_12712c88fd19bd5b+0x2a/0x32 bpf_dispatcher_nop_func include/linux/bpf.h:1335 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2257 [inline] bpf_trace_run4+0x28b/0x4a0 kernel/trace/bpf_trace.c:2300 __do_trace_mm_page_alloc include/trace/events/kmem.h:177 [inline] trace_mm_page_alloc+0x129/0x150 include/trace/events/kmem.h:177 __alloc_frozen_pages_noprof+0x1d6/0x370 mm/page_alloc.c:5170 __alloc_pages_noprof+0xa/0x30 mm/page_alloc.c:5182 __alloc_pages_node_noprof include/linux/gfp.h:284 [inline] alloc_pages_node_noprof include/linux/gfp.h:311 [inline] bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:125 [inline] bpf_ringbuf_alloc+0x254/0x590 kernel/bpf/ringbuf.c:173 ringbuf_map_alloc+0x1c8/0x2f0 kernel/bpf/ringbuf.c:208 map_create+0xaa3/0x14d0 kernel/bpf/syscall.c:1480 __sys_bpf+0x60f/0x870 kernel/bpf/syscall.c:6011 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline] __se_sys_bpf kernel/bpf/syscall.c:6137 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f19d198ebe9 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:00007f19d2751038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f19d1bb5fa0 RCX: 00007f19d198ebe9 RDX: 0000000000000048 RSI: 00002000000007c0 RDI: 0000000000000000 RBP: 00007f19d1a11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f19d1bb6038 R14: 00007f19d1bb5fa0 R15: 00007ffd0fe36828 Allocated by task 8432: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4365 [inline] __kmalloc_node_noprof+0x276/0x4e0 mm/slub.c:4371 kmalloc_node_noprof include/linux/slab.h:932 [inline] __bpf_map_area_alloc kernel/bpf/syscall.c:393 [inline] bpf_map_area_alloc+0x64/0x180 kernel/bpf/syscall.c:406 prealloc_elems_and_freelist+0x86/0x1d0 kernel/bpf/stackmap.c:51 stack_map_alloc+0x33f/0x4c0 kernel/bpf/stackmap.c:114 map_create+0xaa3/0x14d0 kernel/bpf/syscall.c:1480 __sys_bpf+0x60f/0x870 kernel/bpf/syscall.c:6011 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline] __se_sys_bpf kernel/bpf/syscall.c:6137 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888063b94000 which belongs to the cache kmalloc-cg-2k of size 2048 The buggy address is located 24 bytes to the right of allocated 1600-byte region [ffff888063b94000, ffff888063b94640) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x63b90 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880291ba381 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801a44b3c0 ffffea0001f9d000 dead000000000002 raw: 0000000000000000 0000000000080008 00000000f5000000 ffff8880291ba381 head: 00fff00000000040 ffff88801a44b3c0 ffffea0001f9d000 dead000000000002 head: 0000000000000000 0000000000080008 00000000f5000000 ffff8880291ba381 head: 00fff00000000003 ffffea00018ee401 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 7699, tgid 7699 (dhcpcd), ts 161741761253, free_ts 161634833512 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2655 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0xbeb/0x1410 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4391 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] bpf_prog_alloc_no_stats+0xdb/0x4b0 kernel/bpf/core.c:108 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:150 __get_filter+0xff/0x400 net/core/filter.c:1521 sk_attach_filter+0x24/0x140 net/core/filter.c:1556 sk_setsockopt+0x1f83/0x2dc0 net/core/sock.c:1462 do_sock_setsockopt+0x11b/0x1b0 net/socket.c:2340 __sys_setsockopt net/socket.c:2369 [inline] __do_sys_setsockopt net/socket.c:2375 [inline] __se_sys_setsockopt net/socket.c:2372 [inline] __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2372 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 7684 tgid 7684 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895 discard_slab mm/slub.c:2753 [inline] __put_partials+0x156/0x1a0 mm/slub.c:3218 put_cpu_partial+0x17c/0x250 mm/slub.c:3293 __slab_free+0x2d5/0x3c0 mm/slub.c:4550 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4236 new_handle fs/jbd2/transaction.c:457 [inline] jbd2__journal_start+0x146/0x5b0 fs/jbd2/transaction.c:484 __ext4_journal_start_sb+0x227/0x5c0 fs/ext4/ext4_jbd2.c:115 __ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline] ext4_dirty_inode+0x93/0x110 fs/ext4/inode.c:6535 __mark_inode_dirty+0x2ce/0xdf0 fs/fs-writeback.c:2527 generic_update_time fs/inode.c:2063 [inline] inode_update_time fs/inode.c:2076 [inline] __file_update_time fs/inode.c:2304 [inline] file_update_time+0x40c/0x490 fs/inode.c:2334 ext4_page_mkwrite+0x20e/0x1190 fs/ext4/inode.c:6704 do_page_mkwrite+0x14d/0x310 mm/memory.c:3361 do_shared_fault mm/memory.c:5649 [inline] do_fault mm/memory.c:5711 [inline] do_pte_missing mm/memory.c:4234 [inline] handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault+0x1916/0x5440 mm/memory.c:6195 Memory state around the buggy address: ffff888063b94500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888063b94580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888063b94600: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888063b94680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888063b94700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================