syzbot

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BUG: KASAN: vmalloc-out-of-bounds in vrealloc_noprof+0x340/0x3a0 mm/vmalloc.c:4095
Write of size 2097120 at addr ffffc9000c600020 by task syz-executor382/5856

CPU: 1 UID: 0 PID: 5856 Comm: syz-executor382 Not tainted 6.12.0-next-20241120-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 __asan_memset+0x23/0x50 mm/kasan/shadow.c:84
 vrealloc_noprof+0x340/0x3a0 mm/vmalloc.c:4095
 push_insn_history+0x16c/0x6a0 kernel/bpf/verifier.c:3571
 check_mem_access+0xf30/0x2240 kernel/bpf/verifier.c:7267
 do_check+0x7d97/0xfcd0 kernel/bpf/verifier.c:18703
 do_check_common+0x1564/0x2010 kernel/bpf/verifier.c:21848
 do_check_main kernel/bpf/verifier.c:21939 [inline]
 bpf_check+0x19380/0x1f1b0 kernel/bpf/verifier.c:22656
 bpf_prog_load+0x1667/0x20f0 kernel/bpf/syscall.c:2947
 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5790
 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5895 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5895
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f82b1a0e2f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffa78fc1f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f82b1a0e2f9
RDX: 0000000000000090 RSI: 0000000020000840 RDI: 0000000000000005
RBP: 000000000003551f R08: 0000000000000000 R09: 00007fffa78fc21c
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffa78fc21c
R13: 431bde82d7b634db R14: 00007fffa78fc230 R15: 0000000000000001
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc9000c200000, ffffc9000c801000) created by:
 kvrealloc_noprof+0xc7/0x120 mm/util.c:747

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6da00
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 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 5856, tgid 5856 (syz-executor382), ts 245334294068, free_ts 15243076114
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0x3725/0x3870 mm/page_alloc.c:3510
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4787
 alloc_pages_mpol_noprof+0x3e8/0x680 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+0x9c9/0x1380 mm/vmalloc.c:3844
 __kvmalloc_node_noprof+0x142/0x190 mm/util.c:672
 kvrealloc_noprof+0xc7/0x120 mm/util.c:747
 push_insn_history+0x16c/0x6a0 kernel/bpf/verifier.c:3571
 check_mem_access+0xf30/0x2240 kernel/bpf/verifier.c:7267
 do_check+0x7d97/0xfcd0 kernel/bpf/verifier.c:18703
 do_check_common+0x1564/0x2010 kernel/bpf/verifier.c:21848
 do_check_main kernel/bpf/verifier.c:21939 [inline]
 bpf_check+0x19380/0x1f1b0 kernel/bpf/verifier.c:22656
 bpf_prog_load+0x1667/0x20f0 kernel/bpf/syscall.c:2947
 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5790
 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5895 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5895
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page+0xdf9/0x1140 mm/page_alloc.c:2693
 free_contig_range+0x152/0x550 mm/page_alloc.c:6666
 destroy_args+0x92/0x910 mm/debug_vm_pgtable.c:1017
 debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1397
 do_one_initcall+0x248/0x880 init/main.c:1266
 do_initcall_level+0x157/0x210 init/main.c:1328
 do_initcalls+0x3f/0x80 init/main.c:1344
 kernel_init_freeable+0x435/0x5d0 init/main.c:1577
 kernel_init+0x1d/0x2b0 init/main.c:1466
 ret_from_fork+0x4b/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:
 ffffc9000c5fff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000c5fff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000c600000: 00 00 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                               ^
 ffffc9000c600080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc9000c600100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
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