================================================================== BUG: KASAN: slab-out-of-bounds in string_nocheck lib/vsprintf.c:642 [inline] BUG: KASAN: slab-out-of-bounds in string+0x204/0x290 lib/vsprintf.c:724 Read of size 1 at addr ffff88807f01b3dc by task syz.2.342/5839 CPU: 1 PID: 5839 Comm: syz.2.342 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 string_nocheck lib/vsprintf.c:642 [inline] string+0x204/0x290 lib/vsprintf.c:724 vsnprintf+0x10db/0x1c20 lib/vsprintf.c:2811 va_format lib/vsprintf.c:1713 [inline] pointer+0x7b2/0xc60 lib/vsprintf.c:2448 vsnprintf+0xd7c/0x1c20 lib/vsprintf.c:2815 vprintk_store+0x378/0x11b0 kernel/printk/printk.c:2164 vprintk_emit+0x85/0x150 kernel/printk/printk.c:2258 _printk+0xda/0x130 kernel/printk/printk.c:2299 __dynamic_pr_debug+0x196/0x240 lib/dynamic_debug.c:619 nfc_llcp_wks_sap net/nfc/llcp_core.c:344 [inline] nfc_llcp_get_sdp_ssap+0x3c1/0x3f0 net/nfc/llcp_core.c:420 llcp_sock_bind+0x3a2/0x770 net/nfc/llcp_sock.c:117 __sys_bind+0x2e9/0x3e0 net/socket.c:1730 __do_sys_bind net/socket.c:1741 [inline] __se_sys_bind net/socket.c:1739 [inline] __x64_sys_bind+0x76/0x80 net/socket.c:1739 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: 0033:0x7f71d4f48159 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:00007f71d31a0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007f71d51cffa0 RCX: 00007f71d4f48159 RDX: 0000000000000060 RSI: 0000200000001040 RDI: 0000000000000004 RBP: 00007f71d4fdf06b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f71d51d0038 R14: 00007f71d51cffa0 R15: 00007ffeb5cc2ce8 Allocated by task 5839: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xaf/0xe0 mm/kasan/common.c:522 kmemdup+0x22/0x50 mm/util.c:128 llcp_sock_bind+0x360/0x770 net/nfc/llcp_sock.c:107 __sys_bind+0x2e9/0x3e0 net/socket.c:1730 __do_sys_bind net/socket.c:1741 [inline] __se_sys_bind net/socket.c:1739 [inline] __x64_sys_bind+0x76/0x80 net/socket.c:1739 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 The buggy address belongs to the object at ffff88807f01b3c0 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 28 bytes inside of 32-byte region [ffff88807f01b3c0, ffff88807f01b3e0) The buggy address belongs to the page: page:ffffea0001fc06c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f01b flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00005f6740 0000001200000012 ffff888016c41500 raw: 0000000000000000 0000000080400040 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 19734139394, free_ts 19725418311 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2031 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x807/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc_trace+0xf9/0x290 mm/slub.c:3250 kmalloc include/linux/slab.h:607 [inline] mpi_alloc+0x4e/0x130 lib/mpi/mpiutil.c:91 mpi_read_raw_data+0x13f/0x970 lib/mpi/mpicoder.c:58 rsa_set_pub_key+0x1c4/0x360 crypto/rsa.c:174 crypto_akcipher_set_pub_key include/crypto/akcipher.h:394 [inline] pkcs1pad_set_pub_key+0xc0/0x1b0 crypto/rsa-pkcs1pad.c:115 public_key_verify_signature+0x56d/0xd40 crypto/asymmetric_keys/public_key.c:-1 x509_check_for_self_signed+0x317/0x420 crypto/asymmetric_keys/x509_public_key.c:136 x509_cert_parse+0x59c/0x7a0 crypto/asymmetric_keys/x509_cert_parser.c:135 x509_key_preparse+0x60/0x5d0 crypto/asymmetric_keys/x509_public_key.c:169 asymmetric_key_preparse+0xa5/0x140 crypto/asymmetric_keys/asymmetric_type.c:393 key_create_or_update+0x432/0xa40 security/keys/key.c:862 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396 __vunmap+0x8e0/0xa80 mm/vmalloc.c:2628 free_work+0x56/0x80 mm/vmalloc.c:95 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff88807f01b280: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc ffff88807f01b300: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc >ffff88807f01b380: fa fb fb fb fc fc fc fc 00 00 00 04 fc fc fc fc ^ ffff88807f01b400: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88807f01b480: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================