================================================================== BUG: KASAN: vmalloc-out-of-bounds in vrealloc_noprof+0x132/0x320 mm/vmalloc.c:4093 Write of size 4064 at addr ffffc90021d5d020 by task syz.2.1233/9584 CPU: 2 UID: 0 PID: 9584 Comm: syz.2.1233 Not tainted 6.15.0-rc2-syzkaller-00087-gcfb2e2c57aef #0 PREEMPT(full) 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:408 [inline] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 __asan_memset+0x23/0x50 mm/kasan/shadow.c:84 vrealloc_noprof+0x132/0x320 mm/vmalloc.c:4093 push_insn_history+0x2ae/0x6c0 kernel/bpf/verifier.c:3874 do_check kernel/bpf/verifier.c:19450 [inline] do_check_common+0xbd3/0xc2a0 kernel/bpf/verifier.c:22776 do_check_main kernel/bpf/verifier.c:22867 [inline] bpf_check+0x7f51/0xb460 kernel/bpf/verifier.c:24033 bpf_prog_load+0xe41/0x2490 kernel/bpf/syscall.c:2971 __sys_bpf+0x433c/0x4d80 kernel/bpf/syscall.c:5834 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5939 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf706e579 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:00000000f505e55c EFLAGS: 00000296 ORIG_RAX: 0000000000000165 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000800017c0 RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the virtual mapping at [ffffc90021d3d000, ffffc90021d5f000) created by: kvrealloc_noprof+0x7d/0xd0 mm/slub.c:5113 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x5bf4 pfn:0x58f58 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000005bf4 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 9584, tgid 9583 (syz.2.1233), ts 172163738292, free_ts 172143817637 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3700 __alloc_pages_slowpath mm/page_alloc.c:4521 [inline] __alloc_frozen_pages_noprof+0x5a8/0x23a0 mm/page_alloc.c:4995 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301 alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline] alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2392 vm_area_alloc_pages mm/vmalloc.c:3591 [inline] __vmalloc_area_node mm/vmalloc.c:3669 [inline] __vmalloc_node_range_noprof+0x732/0x1540 mm/vmalloc.c:3844 __kvmalloc_node_noprof+0x2ff/0x600 mm/slub.c:5038 kvrealloc_noprof+0x7d/0xd0 mm/slub.c:5113 push_insn_history+0x2ae/0x6c0 kernel/bpf/verifier.c:3874 do_check kernel/bpf/verifier.c:19450 [inline] do_check_common+0xbd3/0xc2a0 kernel/bpf/verifier.c:22776 do_check_main kernel/bpf/verifier.c:22867 [inline] bpf_check+0x7f51/0xb460 kernel/bpf/verifier.c:24033 bpf_prog_load+0xe41/0x2490 kernel/bpf/syscall.c:2971 __sys_bpf+0x433c/0x4d80 kernel/bpf/syscall.c:5834 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5939 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 page last free pid 114 tgid 114 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] free_unref_folios+0x999/0x1630 mm/page_alloc.c:2782 shrink_folio_list+0x3255/0x40e0 mm/vmscan.c:1552 evict_folios+0x779/0x1b60 mm/vmscan.c:4698 try_to_shrink_lruvec+0x5a3/0x990 mm/vmscan.c:4859 shrink_one+0x3e3/0x7a0 mm/vmscan.c:4904 shrink_many mm/vmscan.c:4967 [inline] lru_gen_shrink_node mm/vmscan.c:5045 [inline] shrink_node+0x268e/0x3d20 mm/vmscan.c:6016 kswapd_shrink_node mm/vmscan.c:6844 [inline] balance_pgdat+0xba5/0x19c0 mm/vmscan.c:7027 kswapd+0x590/0xb90 mm/vmscan.c:7292 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffffc90021d5cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90021d5cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90021d5d000: 00 00 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc90021d5d080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90021d5d100: 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