================================================================== BUG: KASAN: slab-out-of-bounds in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 Read of size 8 at addr ffffaf800c457f30 by task sshd/2035 CPU: 0 PID: 2035 Comm: sshd Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 [] __bfs_forwards kernel/locking/lockdep.c:1803 [inline] [] check_path.constprop.0+0x24/0x46 kernel/locking/lockdep.c:2104 [] check_noncircular+0x11a/0x1fe kernel/locking/lockdep.c:2131 Allocated by task 1974: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0x80/0xb2 mm/kasan/common.c:524 kasan_kmalloc include/linux/kasan.h:270 [inline] __kmalloc+0x190/0x318 mm/slub.c:4424 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:715 [inline] tomoyo_init_log+0xd00/0x14cc security/tomoyo/audit.c:275 tomoyo_supervisor+0x250/0xc1e security/tomoyo/common.c:2097 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x152/0x18e security/tomoyo/file.c:573 tomoyo_check_open_permission+0x304/0x348 security/tomoyo/file.c:780 tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline] tomoyo_file_open+0x78/0x7c security/tomoyo/tomoyo.c:306 security_file_open+0x44/0x9a security/security.c:1627 do_dentry_open+0x1c6/0x7d4 fs/open.c:811 vfs_open+0x52/0x5e fs/open.c:959 do_open fs/namei.c:3476 [inline] path_openat+0x12b6/0x189e fs/namei.c:3609 do_filp_open+0x10e/0x22a fs/namei.c:3636 do_sys_openat2+0x174/0x31e fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] sys_openat+0xdc/0x164 fs/open.c:1241 ret_from_syscall+0x0/0x2 The buggy address belongs to the object at ffffaf800c457c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 304 bytes to the right of 512-byte region [ffffaf800c457c00, ffffaf800c457e00) The buggy address belongs to the page: page:ffffaf807a9bc7a0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffaf800c457c00 pfn:0x8c654 head:ffffaf807a9bc7a0 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 ffffaf807a9ae108 ffffaf807aa7a9a8 ffffaf8007201c80 raw: ffffaf800c457c00 0000000000100007 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 594, ts 42726746800, free_ts 42709350200 __set_page_owner+0x48/0x136 mm/page_owner.c:183 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x25a/0x2cc mm/slub.c:2004 ___slab_alloc+0x56e/0x918 mm/slub.c:3018 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x2a2/0x2e0 mm/slub.c:3255 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:715 [inline] alloc_bprm+0x48/0x4b6 fs/exec.c:1507 kernel_execve+0x54/0x288 fs/exec.c:1947 call_usermodehelper_exec_async+0x1c0/0x2dc kernel/umh.c:112 ret_from_exception+0x0/0x10 page last free stack trace: __reset_page_owner+0x4a/0xea mm/page_owner.c:142 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x6a/0x31e mm/page_alloc.c:3404 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xe2/0x112 mm/page_alloc.c:5474 free_thread_stack kernel/fork.c:297 [inline] release_task_stack kernel/fork.c:434 [inline] put_task_stack+0x1d0/0x2b0 kernel/fork.c:445 finish_task_switch.isra.0+0x3ce/0x420 kernel/sched/core.c:4898 context_switch kernel/sched/core.c:4989 [inline] __schedule+0x58e/0x118e kernel/sched/core.c:6296 schedule_idle+0x22/0x42 kernel/sched/core.c:6397 do_idle+0xca/0x144 kernel/sched/idle.c:334 cpu_startup_entry+0x1a/0x1c kernel/sched/idle.c:403 smp_callin+0xa2/0xb0 arch/riscv/kernel/smpboot.c:184 Memory state around the buggy address: ffffaf800c457e00: 00 f3 f3 f3 fc fc fc fc fc fc fc fc fc fc fc fc ffffaf800c457e80: fc fc fc fc fc fc fc fc 00 00 00 00 f1 f1 f1 f1 >ffffaf800c457f00: 00 f2 f2 f2 fc fc fc fc 00 00 00 f3 f3 f3 f3 f3 ^ ffffaf800c457f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffffaf800c458000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================