================================================================== BUG: KASAN: use-after-free in string_nocheck lib/vsprintf.c:642 [inline] BUG: KASAN: use-after-free in string+0x20f/0x2a0 lib/vsprintf.c:724 Read of size 1 at addr ffff888101dfdb68 by task syz.3.3206/11126 CPU: 1 PID: 11126 Comm: syz.3.3206 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 string_nocheck lib/vsprintf.c:642 [inline] string+0x20f/0x2a0 lib/vsprintf.c:724 vsnprintf+0xec5/0x1990 lib/vsprintf.c:2811 seq_vprintf fs/seq_file.c:407 [inline] seq_printf+0x185/0x280 fs/seq_file.c:422 show_interrupts+0x91d/0xa90 kernel/irq/proc.c:527 seq_read_iter+0x908/0xce0 fs/seq_file.c:272 proc_reg_read_iter+0x1be/0x290 fs/proc/inode.c:300 call_read_iter include/linux/fs.h:2206 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x6c0/0xc20 fs/read_write.c:485 ksys_read+0x14a/0x260 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:631 x64_sys_call+0x96d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f3a0f866159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3a0e29e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f3a0faee090 RCX: 00007f3a0f866159 RDX: 0000000000002020 RSI: 0000200000006a00 RDI: 0000000000000005 RBP: 00007f3a0f8fd06b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3a0faee128 R14: 00007f3a0faee090 R15: 00007ffc6acc5f88 Allocated by task 10504: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13d/0x2c0 mm/slub.c:4436 __kmalloc_node include/linux/slab.h:487 [inline] kmalloc_node include/linux/slab.h:642 [inline] __vmalloc_area_node mm/vmalloc.c:2967 [inline] __vmalloc_node_range+0x384/0xad0 mm/vmalloc.c:3147 module_alloc+0x84/0x90 arch/x86/kernel/module.c:76 bpf_jit_alloc_exec+0x15/0x20 kernel/bpf/core.c:866 bpf_jit_binary_alloc+0x12d/0x250 kernel/bpf/core.c:894 bpf_int_jit_compile+0xb2f5/0xc4c0 arch/x86/net/bpf_jit_comp.c:2460 bpf_prog_select_runtime+0x6ea/0x9e0 kernel/bpf/core.c:1947 bpf_prog_load+0x10f4/0x1620 kernel/bpf/syscall.c:2332 __sys_bpf+0x51d/0x7d0 kernel/bpf/syscall.c:4633 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline] __se_sys_bpf kernel/bpf/syscall.c:4735 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735 x64_sys_call+0x4b9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 2046: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc4/0x270 mm/slub.c:4588 kvfree+0x35/0x40 mm/util.c:661 __vunmap+0x8e6/0x980 mm/vmalloc.c:2666 __vfree mm/vmalloc.c:2709 [inline] vfree+0x8b/0xc0 mm/vmalloc.c:2740 module_memfree+0x17/0x30 kernel/module.c:2150 bpf_jit_free_exec+0x15/0x20 kernel/bpf/core.c:871 bpf_jit_binary_free kernel/bpf/core.c:918 [inline] bpf_jit_free+0x98/0x240 kernel/bpf/core.c:931 bpf_prog_free_deferred+0x5c7/0x6d0 kernel/bpf/core.c:2315 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff888101dfdb68 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes inside of 8-byte region [ffff888101dfdb68, ffff888101dfdb70) The buggy address belongs to the page: page:ffffea0004077f40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101dfd flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 0000000100000001 ffff888100042300 raw: 0000000000000000 0000000000660066 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 2284025871, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc+0x16a/0x2c0 mm/slub.c:4432 kmalloc include/linux/slab.h:624 [inline] kzalloc include/linux/slab.h:750 [inline] acpi_os_allocate_zeroed include/acpi/platform/aclinuxex.h:57 [inline] acpi_ns_internalize_name+0x2cd/0x3b0 drivers/acpi/acpica/nsutils.c:331 acpi_ns_get_node_unlocked drivers/acpi/acpica/nsutils.c:666 [inline] acpi_ns_get_node+0x1a7/0x360 drivers/acpi/acpica/nsutils.c:726 acpi_ns_evaluate+0x35d/0xa20 drivers/acpi/acpica/nseval.c:62 acpi_ut_evaluate_object+0x12f/0x480 drivers/acpi/acpica/uteval.c:60 acpi_rs_get_prt_method_data+0x92/0x110 drivers/acpi/acpica/rsutils.c:446 acpi_get_irq_routing_table+0xb4/0xe0 drivers/acpi/acpica/rsxface.c:137 acpi_pci_irq_find_prt_entry+0x160/0xe70 drivers/acpi/pci_irq.c:214 acpi_pci_irq_lookup+0x40/0x580 drivers/acpi/pci_irq.c:298 page_owner free stack trace missing Memory state around the buggy address: ffff888101dfda00: 05 fc fc fc fc fa fc fc fc fc 05 fc fc fc fc 05 ffff888101dfda80: fc fc fc fc 05 fc fc fc fc 05 fc fc fc fc fa fc >ffff888101dfdb00: fc fc fc 05 fc fc fc fc 06 fc fc fc fc fa fc fc ^ ffff888101dfdb80: fc fc 05 fc fc fc fc 06 fc fc fc fc fa fc fc fc ffff888101dfdc00: fc fa fc fc fc fc 06 fc fc fc fc fa fc fc fc fc ==================================================================