================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf800ff97f90 by task syz-executor.0/2041 CPU: 0 PID: 2041 Comm: syz-executor.0 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 [] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 [] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146 [] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 Allocated by task 4294967290: (stack is not available) Freed by task 2051: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track+0x1a/0x26 mm/kasan/common.c:45 kasan_set_free_info+0x1e/0x3a mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x15e/0x180 mm/kasan/common.c:328 __kasan_slab_free+0x10/0x18 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8e/0x1cc mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xe0/0x3e4 mm/slub.c:4562 tomoyo_realpath_from_path+0x158/0x3f4 security/tomoyo/realpath.c:291 tomoyo_scan_exec_realpath security/tomoyo/condition.c:243 [inline] tomoyo_condition+0x9fe/0x1978 security/tomoyo/condition.c:827 tomoyo_check_acl+0x140/0x312 security/tomoyo/domain.c:177 tomoyo_execute_permission+0xc0/0x210 security/tomoyo/file.c:615 tomoyo_find_next_domain+0x226/0x1192 security/tomoyo/domain.c:752 tomoyo_bprm_check_security security/tomoyo/tomoyo.c:101 [inline] tomoyo_bprm_check_security+0xdc/0x136 security/tomoyo/tomoyo.c:91 security_bprm_check+0x44/0x96 security/security.c:866 search_binary_handler fs/exec.c:1715 [inline] exec_binprm fs/exec.c:1768 [inline] bprm_execve fs/exec.c:1837 [inline] bprm_execve+0x532/0x1140 fs/exec.c:1799 kernel_execve+0x204/0x288 fs/exec.c:1980 call_usermodehelper_exec_async+0x1c0/0x2dc kernel/umh.c:112 ret_from_exception+0x0/0x10 Last potentially related work creation: 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_array include/linux/slab.h:621 [inline] kcalloc include/linux/slab.h:652 [inline] __list_lru_init+0x7e/0x64e mm/list_lru.c:584 alloc_super+0x4b8/0x52a fs/super.c:270 sget_fc+0xc8/0x3a0 fs/super.c:530 vfs_get_super fs/super.c:1134 [inline] get_tree_nodev+0x2e/0x128 fs/super.c:1169 pseudo_fs_get_tree+0x22/0x2c fs/libfs.c:352 vfs_get_tree+0x4a/0x19c fs/super.c:1497 fc_mount fs/namespace.c:1000 [inline] vfs_kern_mount.part.0+0xdc/0x126 fs/namespace.c:1030 vfs_kern_mount fs/namespace.c:1017 [inline] kern_mount+0x38/0x7a fs/namespace.c:4375 nsfs_init+0x22/0x92 fs/nsfs.c:302 start_kernel+0x63a/0x698 init/main.c:1124 The buggy address belongs to the object at ffffaf800ff96000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3984 bytes to the right of 4096-byte region [ffffaf800ff96000, ffffaf800ff97000) The buggy address belongs to the page: page:ffffaf807aac7080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x90190 head:ffffaf807aac7080 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x9000010200(slab|head|section=18|node=0|zone=0) raw: 0000009000010200 0000000000000000 0000000000000122 ffffaf8007202140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2048, ts 881564130500, free_ts 729483264700 __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] __kmalloc+0x268/0x318 mm/slub.c:4420 kmalloc include/linux/slab.h:586 [inline] tomoyo_realpath_from_path+0x9c/0x3f4 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x1a6/0x428 security/tomoyo/file.c:723 tomoyo_file_ioctl+0x28/0x34 security/tomoyo/tomoyo.c:327 security_file_ioctl+0x48/0x90 security/security.c:1533 __do_sys_ioctl fs/ioctl.c:868 [inline] sys_ioctl+0x106/0x139e fs/ioctl.c:860 ret_from_syscall+0x0/0x2 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_slab+0x122/0x27c mm/slub.c:2028 free_slab mm/slub.c:2043 [inline] discard_slab+0x4c/0x7a mm/slub.c:2049 __slab_free+0x20a/0x29c mm/slub.c:3414 do_slab_free mm/slub.c:3497 [inline] ___cache_free+0x17c/0x354 mm/slub.c:3516 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x7c/0x132 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14c/0x1c8 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x5c/0x98 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] kmem_cache_alloc_node+0x368/0x41c mm/slub.c:3266 __alloc_skb+0x234/0x2e4 net/core/skbuff.c:414 alloc_skb_fclone include/linux/skbuff.h:1208 [inline] tcp_stream_alloc_skb+0x70/0x4c0 net/ipv4/tcp.c:861 tcp_sendmsg_locked+0x880/0x1d9e net/ipv4/tcp.c:1281 tcp_sendmsg+0x32/0x4e net/ipv4/tcp.c:1440 Memory state around the buggy address: ffffaf800ff97e80: 00 00 00 00 fc fc fc fc 00 00 00 00 00 00 00 00 ffffaf800ff97f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffffaf800ff97f80: fc fc fc fc fc fc fc fc fc fc fc fc f1 f1 f1 f1 ^ ffffaf800ff98000: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ffffaf800ff98080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================