================================================================== BUG: KASAN: vmalloc-out-of-bounds in vrealloc_noprof+0x34a/0x3d0 mm/vmalloc.c:4097 Write of size 2097120 at addr ffffc90021c00020 by task syz.1.3122/16039 CPU: 1 UID: 0 PID: 16039 Comm: syz.1.3122 Not tainted 6.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __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+0x34a/0x3d0 mm/vmalloc.c:4097 push_insn_history+0x16f/0x6b0 kernel/bpf/verifier.c:3751 check_stack_read_fixed_off kernel/bpf/verifier.c:5295 [inline] check_stack_read+0x1db2/0x2ac0 kernel/bpf/verifier.c:5393 check_mem_access+0xbf9/0x2140 kernel/bpf/verifier.c:7426 do_check+0x9b74/0xfb10 kernel/bpf/verifier.c:19051 do_check_common+0x1268/0x1bd0 kernel/bpf/verifier.c:22258 do_check_main kernel/bpf/verifier.c:22349 [inline] bpf_check+0x5a44/0x1bcd0 kernel/bpf/verifier.c:23145 bpf_prog_load+0x1664/0x20e0 kernel/bpf/syscall.c:2951 __sys_bpf+0x4ea/0x820 kernel/bpf/syscall.c:5794 __do_sys_bpf kernel/bpf/syscall.c:5901 [inline] __se_sys_bpf kernel/bpf/syscall.c:5899 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5899 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: 0033:0x7fe40c18cde9 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:00007fe40d060038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fe40c3a5fa0 RCX: 00007fe40c18cde9 RDX: 0000000000000048 RSI: 0000400000000200 RDI: 0000000000000005 RBP: 00007fe40c20e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe40c3a5fa0 R15: 00007ffc394945b8 The buggy address belongs to the virtual mapping at [ffffc90021800000, ffffc90021e01000) created by: kvrealloc_noprof+0xc1/0x150 mm/util.c:759 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4a000 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 16039, tgid 16037 (syz.1.3122), ts 863727675121, free_ts 715293069327 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_frozen_pages_noprof mm/mempolicy.c:2341 [inline] alloc_pages_noprof+0x121/0x190 mm/mempolicy.c:2361 vm_area_alloc_pages mm/vmalloc.c:3591 [inline] __vmalloc_area_node mm/vmalloc.c:3669 [inline] __vmalloc_node_range_noprof+0x9c6/0x1380 mm/vmalloc.c:3846 __kvmalloc_node_noprof+0x142/0x190 mm/util.c:684 kvrealloc_noprof+0xc1/0x150 mm/util.c:759 push_insn_history+0x16f/0x6b0 kernel/bpf/verifier.c:3751 is_state_visited kernel/bpf/verifier.c:18710 [inline] do_check+0x6930/0xfb10 kernel/bpf/verifier.c:18959 do_check_common+0x1268/0x1bd0 kernel/bpf/verifier.c:22258 do_check_main kernel/bpf/verifier.c:22349 [inline] bpf_check+0x5a44/0x1bcd0 kernel/bpf/verifier.c:23145 bpf_prog_load+0x1664/0x20e0 kernel/bpf/syscall.c:2951 __sys_bpf+0x4ea/0x820 kernel/bpf/syscall.c:5794 __do_sys_bpf kernel/bpf/syscall.c:5901 [inline] __se_sys_bpf kernel/bpf/syscall.c:5899 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5899 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 13766 tgid 13766 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_folios+0xe40/0x18b0 mm/page_alloc.c:2707 folios_put_refs+0x76c/0x860 mm/swap.c:994 release_pages+0x5c0/0x690 mm/swap.c:1034 io_free_region+0xb7/0x260 io_uring/memmap.c:101 io_rings_free io_uring/io_uring.c:2636 [inline] io_ring_ctx_free+0x329/0x530 io_uring/io_uring.c:2725 io_ring_exit_work+0x813/0x8a0 io_uring/io_uring.c:2939 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xac0/0x18e0 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7ab/0x920 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffffc90021bfff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90021bfff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90021c00000: 00 00 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc90021c00080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90021c00100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ==================================================================