================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf80100f7fb0 by task syz-executor.1/2043 CPU: 0 PID: 2043 Comm: syz-executor.1 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 32: (stack is not available) Freed by task 2461: 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_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1fc/0x3a8 security/tomoyo/file.c:822 tomoyo_inode_getattr+0x1e/0x28 security/tomoyo/tomoyo.c:122 security_inode_getattr+0x82/0xc6 security/security.c:1326 vfs_getattr fs/stat.c:157 [inline] vfs_fstat+0x54/0xc8 fs/stat.c:182 __do_sys_newfstat+0x96/0x106 fs/stat.c:422 sys_newfstat+0x22/0x2e fs/stat.c:419 ret_from_syscall+0x0/0x2 Last potentially related work creation: ------------[ cut here ]------------ slab index 2096905 out of bounds (319) for stack id ffffff09 WARNING: CPU: 0 PID: 2043 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2043 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2043 Comm: syz-executor.1 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) epc : stack_depot_fetch lib/stackdepot.c:304 [inline] epc : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 ra : stack_depot_fetch lib/stackdepot.c:304 [inline] ra : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 epc : ffffffff80c00b8a ra : ffffffff80c00b8a sp : ffffaf80100f7e40 gp : ffffffff85863ac0 tp : ffffaf800baf8000 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf80100f7e50 s1 : ffffaf807aacd380 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 422232bce9864900 a5 : 422232bce9864900 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf80100f7fb0 s3 : ffffaf8007202140 s4 : ffffaf80100f6000 s5 : ffffaf80100f7000 s6 : 0000000000003fff s7 : ffffaf80100f7fa0 s8 : ffffffff8000a4a4 s9 : ffffffffffffc000 s10: ffffaf80100f8000 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf80100f7938 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 [] describe_object_stacks mm/kasan/report.c:216 [inline] [] describe_object mm/kasan/report.c:231 [inline] [] print_address_description.constprop.0+0x2fc/0x330 mm/kasan/report.c:263 [] __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 irq event stamp: 108299 hardirqs last enabled at (108298): [] seqcount_lockdep_reader_access include/linux/seqlock.h:105 [inline] hardirqs last enabled at (108298): [] read_seqbegin include/linux/seqlock.h:840 [inline] hardirqs last enabled at (108298): [] neigh_hh_output include/net/neighbour.h:495 [inline] hardirqs last enabled at (108298): [] neigh_output include/net/neighbour.h:539 [inline] hardirqs last enabled at (108298): [] ip_finish_output2+0x157a/0x1720 net/ipv4/ip_output.c:221 hardirqs last disabled at (108299): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (108299): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (108234): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (108234): [] __ip6_ins_rt net/ipv6/route.c:1303 [inline] softirqs last enabled at (108234): [] ip6_route_add+0x7e/0x148 net/ipv6/route.c:3857 softirqs last disabled at (108241): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (108241): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (108241): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf80100f6000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 4016 bytes to the right of 4096-byte region [ffffaf80100f6000, ffffaf80100f7000) The buggy address belongs to the page: page:ffffaf807aacd380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x902f0 head:ffffaf807aacd380 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 2461, ts 856443354500, free_ts 854820619200 __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_check_open_permission+0x282/0x348 security/tomoyo/file.c:771 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 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 include/linux/skbuff.h:1158 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1189 [inline] netlink_sendmsg+0x7d4/0x994 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xa0/0xc4 net/socket.c:725 __sys_sendto+0x1f2/0x2e0 net/socket.c:2040 Memory state around the buggy address: ffffaf80100f7e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffffaf80100f7f00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 >ffffaf80100f7f80: 00 00 00 00 fc fc fc fc 00 00 00 00 f1 f1 f1 f1 ^ ffffaf80100f8000: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ffffaf80100f8080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================