================================================================== 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 ffff8880657f9337 by task syz.0.1196/9303 CPU: 1 UID: 0 PID: 9303 Comm: syz.0.1196 Not tainted 6.11.0-rc4-syzkaller-00309-gea02a946873b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __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:5761 [inline] btf_new_fd+0x43f/0xd30 kernel/bpf/btf.c:7681 __sys_bpf+0x6ef/0x810 kernel/bpf/syscall.c:5757 __do_sys_bpf kernel/bpf/syscall.c:5819 [inline] __se_sys_bpf kernel/bpf/syscall.c:5817 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5817 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: 0033:0x7f9096b7def9 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:00007f9097a38038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f9096d35f80 RCX: 00007f9096b7def9 RDX: 0000000000000020 RSI: 00000000200004c0 RDI: 0000000000000012 RBP: 00007f9096bf0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f9096d35f80 R15: 00007ffdd1c5cb68 Allocated by task 9303: 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:5737 [inline] btf_new_fd+0x265/0xd30 kernel/bpf/btf.c:7681 __sys_bpf+0x6ef/0x810 kernel/bpf/syscall.c:5757 __do_sys_bpf kernel/bpf/syscall.c:5819 [inline] __se_sys_bpf kernel/bpf/syscall.c:5817 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5817 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 ffff8880657f9300 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes to the right of allocated 55-byte region [ffff8880657f9300, ffff8880657f9337) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x657f9 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff88801ac418c0 ffffea0000d00600 dead000000000002 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 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 4686, tgid 4686 (udevd), ts 213386087594, free_ts 213377039468 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_check_open_permission+0x255/0x500 security/tomoyo/file.c:771 security_file_open+0x6a/0x750 security/security.c:2988 do_dentry_open+0x38e/0x1440 fs/open.c:946 vfs_open+0x3e/0x330 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2b3e/0x3470 fs/namei.c:3886 do_filp_open+0x235/0x490 fs/namei.c:3913 page last free pid 5313 tgid 5313 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 vfree+0x186/0x2e0 mm/vmalloc.c:3364 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:3285 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 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: ffff8880657f9200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880657f9280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880657f9300: 00 00 00 00 00 00 07 fc fc fc fc fc fc fc fc fc ^ ffff8880657f9380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880657f9400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================