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BUG: KASAN: slab-out-of-bounds in btf_name_valid_section kernel/bpf/btf.c:824 [inline]
BUG: KASAN: slab-out-of-bounds in btf_datasec_check_meta+0x2c9/0x9a0 kernel/bpf/btf.c:4693
Read of size 1 at addr ffff88803150402d by task syz.1.78/5539

CPU: 0 UID: 0 PID: 5539 Comm: syz.1.78 Not tainted 6.11.0-rc4-syzkaller-00326-g5277d130947b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 btf_name_valid_section kernel/bpf/btf.c:824 [inline]
 btf_datasec_check_meta+0x2c9/0x9a0 kernel/bpf/btf.c:4693
 btf_check_meta kernel/bpf/btf.c:5175 [inline]
 btf_check_all_metas kernel/bpf/btf.c:5199 [inline]
 btf_parse_type_sec+0x4d5/0x2620 kernel/bpf/btf.c:5335
 btf_parse kernel/bpf/btf.c:5763 [inline]
 btf_new_fd+0x43f/0xd30 kernel/bpf/btf.c:7683
 __sys_bpf+0x6ef/0x810 kernel/bpf/syscall.c:5762
 __do_sys_bpf kernel/bpf/syscall.c:5824 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5822 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5822
 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: 0033:0x7fbec257def9
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:00007fbec33a9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fbec2735f80 RCX: 00007fbec257def9
RDX: 0000000000000028 RSI: 0000000020000000 RDI: 0000000000000012
RBP: 00007fbec25f0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fbec2735f80 R15: 00007fff26cd34c8
 </TASK>

Allocated by task 5539:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4158 [inline]
 __kmalloc_node_noprof+0x22a/0x440 mm/slub.c:4164
 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:650
 btf_parse kernel/bpf/btf.c:5739 [inline]
 btf_new_fd+0x265/0xd30 kernel/bpf/btf.c:7683
 __sys_bpf+0x6ef/0x810 kernel/bpf/syscall.c:5762
 __do_sys_bpf kernel/bpf/syscall.c:5824 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5822 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5822
 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

The buggy address belongs to the object at ffff888031504000
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes to the right of
 allocated 45-byte region [ffff888031504000, ffff88803150402d)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x31504
ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000000 ffff88801ac418c0 ffffea00009325c0 dead000000000003
raw: 0000000000000000 0000000080200020 00000001fdffffff 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 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 4693, tgid 4693 (udevd), ts 41178689640, free_ts 41049154358
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493
 prep_new_page mm/page_alloc.c:1501 [inline]
 get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2321
 allocate_slab+0x5a/0x2f0 mm/slub.c:2484
 new_slab mm/slub.c:2537 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723
 __slab_alloc+0x58/0xa0 mm/slub.c:3813
 __slab_alloc_node mm/slub.c:3866 [inline]
 slab_alloc_node mm/slub.c:4025 [inline]
 __do_kmalloc_node mm/slub.c:4157 [inline]
 __kmalloc_noprof+0x25a/0x400 mm/slub.c:4170
 kmalloc_noprof include/linux/slab.h:685 [inline]
 kzalloc_noprof include/linux/slab.h:807 [inline]
 tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
 tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80
 tomoyo_realpath_from_path+0x59e/0x5e0 security/tomoyo/realpath.c:283
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x2b7/0x740 security/tomoyo/file.c:822
 security_inode_getattr+0xd8/0x130 security/security.c:2269
 vfs_getattr+0x45/0x430 fs/stat.c:204
 vfs_fstat fs/stat.c:229 [inline]
 vfs_fstatat+0xe4/0x190 fs/stat.c:338
 __do_sys_newfstatat fs/stat.c:505 [inline]
 __se_sys_newfstatat fs/stat.c:499 [inline]
 __x64_sys_newfstatat+0x11d/0x1a0 fs/stat.c:499
 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 4706 tgid 4706 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1094 [inline]
 free_unref_page+0xd22/0xea0 mm/page_alloc.c:2612
 discard_slab mm/slub.c:2583 [inline]
 __put_partials+0xeb/0x130 mm/slub.c:3051
 put_cpu_partial+0x17c/0x250 mm/slub.c:3126
 __slab_free+0x2ea/0x3d0 mm/slub.c:4343
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3988 [inline]
 slab_alloc_node mm/slub.c:4037 [inline]
 kmem_cache_alloc_lru_noprof+0x139/0x2b0 mm/slub.c:4056
 shmem_alloc_inode+0x28/0x40 mm/shmem.c:4622
 alloc_inode fs/inode.c:263 [inline]
 new_inode_pseudo fs/inode.c:1073 [inline]
 new_inode+0x6e/0x310 fs/inode.c:1092
 __shmem_get_inode mm/shmem.c:2658 [inline]
 shmem_get_inode+0x34a/0xd50 mm/shmem.c:2729
 shmem_mknod+0x5f/0x1e0 mm/shmem.c:3426
 lookup_open fs/namei.c:3578 [inline]
 open_last_lookups fs/namei.c:3647 [inline]
 path_openat+0x1a9a/0x3470 fs/namei.c:3883
 do_filp_open+0x235/0x490 fs/namei.c:3913
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1442

Memory state around the buggy address:
 ffff888031503f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888031503f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888031504000: 00 00 00 00 00 05 fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff888031504080: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff888031504100: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
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