================================================================== BUG: KASAN: stack-out-of-bounds in __bpf_get_stack+0x5a3/0xaa0 kernel/bpf/stackmap.c:492 Write of size 160 at addr ffffc900035a7378 by task syz.2.274/6900 CPU: 1 UID: 0 PID: 6900 Comm: syz.2.274 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 __bpf_get_stack+0x5a3/0xaa0 kernel/bpf/stackmap.c:492 ____bpf_get_stack kernel/bpf/stackmap.c:516 [inline] bpf_get_stack+0x33/0x50 kernel/bpf/stackmap.c:513 ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1653 [inline] bpf_get_stack_raw_tp+0x1a9/0x220 kernel/trace/bpf_trace.c:1643 ___bpf_prog_run+0xf5b/0xb2b0 kernel/bpf/core.c:2000 __bpf_prog_run32+0xdb/0x130 kernel/bpf/core.c:2294 bpf_dispatcher_nop_func include/linux/bpf.h:1363 [inline] __bpf_prog_run include/linux/filter.h:721 [inline] bpf_prog_run include/linux/filter.h:728 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] bpf_trace_run2+0x284/0x4b0 kernel/trace/bpf_trace.c:2116 __do_trace_kfree include/trace/events/kmem.h:97 [inline] trace_kfree include/trace/events/kmem.h:97 [inline] kfree+0x62f/0x6d0 mm/slub.c:6813 compute_postorder+0x884/0x970 kernel/bpf/verifier.c:-1 bpf_check+0x61b4/0x1dc50 kernel/bpf/verifier.c:24708 bpf_prog_load+0x13ba/0x19d0 kernel/bpf/syscall.c:3077 __sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6149 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline] __se_sys_bpf kernel/bpf/syscall.c:6257 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6257 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0938d8f6c9 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:00007f0939c63038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f0938fe5fa0 RCX: 00007f0938d8f6c9 RDX: 0000000000000094 RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007f0938e11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0938fe6038 R14: 00007f0938fe5fa0 R15: 00007ffed6ed0ca8 The buggy address belongs to stack of task syz.2.274/6900 and is located at offset 56 in frame: __bpf_prog_run32+0x0/0x130 kernel/bpf/core.c:2340 This frame has 2 objects: [32, 64) 'stack' [96, 192) 'regs' The buggy address belongs to a 8-page vmalloc region starting at 0xffffc900035a0000 allocated at copy_process+0x54b/0x3b70 kernel/fork.c:2012 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802bce0440 pfn:0x2bce0 memcg:ffff888076ea6802 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: ffff88802bce0440 0000000000000000 00000001ffffffff ffff888076ea6802 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), pid 6899, tgid 6899 (syz.2.274), ts 137916248021, free_ts 137737865106 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline] alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2507 vm_area_alloc_pages mm/vmalloc.c:3647 [inline] __vmalloc_area_node mm/vmalloc.c:3724 [inline] __vmalloc_node_range_noprof+0x96c/0x12d0 mm/vmalloc.c:3897 __vmalloc_node_noprof+0xc2/0x110 mm/vmalloc.c:3960 alloc_thread_stack_node kernel/fork.c:311 [inline] dup_task_struct+0x3d4/0x830 kernel/fork.c:881 copy_process+0x54b/0x3b70 kernel/fork.c:2012 kernel_clone+0x21e/0x840 kernel/fork.c:2609 __do_sys_clone3 kernel/fork.c:2911 [inline] __se_sys_clone3+0x256/0x2d0 kernel/fork.c:2890 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 23 tgid 23 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906 __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:290 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861 handle_softirqs+0x277/0x860 kernel/softirq.c:622 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1063 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffffc900035a7280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900035a7300: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 >ffffc900035a7380: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffffc900035a7400: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900035a7480: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2 ==================================================================