================================================================== BUG: KASAN: vmalloc-out-of-bounds in push_insn_history+0x615/0x690 kernel/bpf/verifier.c:3579 Write of size 4 at addr ffffc9000c1f9010 by task syz.4.872/8885 CPU: 2 UID: 0 PID: 8885 Comm: syz.4.872 Not tainted 6.12.0-syzkaller-12113-gbcc8eda6d349 #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:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 push_insn_history+0x615/0x690 kernel/bpf/verifier.c:3579 do_check kernel/bpf/verifier.c:18594 [inline] do_check_common+0xb78/0xd540 kernel/bpf/verifier.c:21848 do_check_main kernel/bpf/verifier.c:21939 [inline] bpf_check+0x77c2/0xc9b0 kernel/bpf/verifier.c:22656 bpf_prog_load+0xe3f/0x2670 kernel/bpf/syscall.c:2947 __sys_bpf+0x5677/0x57a0 kernel/bpf/syscall.c:5790 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline] __se_sys_bpf kernel/bpf/syscall.c:5895 [inline] __ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5895 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fe2579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f514557c EFLAGS: 00000292 ORIG_RAX: 0000000000000165 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000200017c0 RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the virtual mapping at [ffffc9000c1d9000, ffffc9000c1fb000) created by: kvrealloc_noprof+0xfc/0x150 mm/util.c:747 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x3ffbe pfn:0x4bd26 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 000000000003ffbe 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102cc2(GFP_HIGHUSER|__GFP_NOWARN), pid 8885, tgid 8883 (syz.4.872), ts 179950870200, free_ts 179848346165 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_slowpath mm/page_alloc.c:4286 [inline] __alloc_pages_noprof+0x6a6/0x25b0 mm/page_alloc.c:4764 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 vm_area_alloc_pages mm/vmalloc.c:3589 [inline] __vmalloc_area_node mm/vmalloc.c:3667 [inline] __vmalloc_node_range_noprof+0x724/0x1530 mm/vmalloc.c:3844 __kvmalloc_node_noprof+0x14f/0x1a0 mm/util.c:672 kvrealloc_noprof+0xfc/0x150 mm/util.c:747 push_insn_history+0x2ac/0x690 kernel/bpf/verifier.c:3571 do_check kernel/bpf/verifier.c:18594 [inline] do_check_common+0xb78/0xd540 kernel/bpf/verifier.c:21848 do_check_main kernel/bpf/verifier.c:21939 [inline] bpf_check+0x77c2/0xc9b0 kernel/bpf/verifier.c:22656 bpf_prog_load+0xe3f/0x2670 kernel/bpf/syscall.c:2947 __sys_bpf+0x5677/0x57a0 kernel/bpf/syscall.c:5790 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline] __se_sys_bpf kernel/bpf/syscall.c:5895 [inline] __ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5895 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e page last free pid 113 tgid 113 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_folios+0xa7b/0x14f0 mm/page_alloc.c:2704 shrink_folio_list+0x3468/0x42d0 mm/vmscan.c:1483 evict_folios+0x6e3/0x19c0 mm/vmscan.c:4593 try_to_shrink_lruvec+0x61e/0xa80 mm/vmscan.c:4789 shrink_one+0x3e3/0x7b0 mm/vmscan.c:4834 shrink_many mm/vmscan.c:4897 [inline] lru_gen_shrink_node mm/vmscan.c:4975 [inline] shrink_node+0xbf0/0x3f20 mm/vmscan.c:5956 kswapd_shrink_node mm/vmscan.c:6785 [inline] balance_pgdat+0xc1f/0x18f0 mm/vmscan.c:6977 kswapd+0x605/0xc00 mm/vmscan.c:7246 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffffc9000c1f8f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000c1f8f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc9000c1f9000: 00 00 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc9000c1f9080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc9000c1f9100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi