================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf8010497fc0 by task syz-executor.0/2047 CPU: 0 PID: 2047 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 1102416563: (stack is not available) Freed by task 2194: 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] kmem_cache_free+0xca/0x482 mm/slub.c:3526 putname+0xd8/0xe4 fs/namei.c:270 user_path_at_empty+0x46/0x5a fs/namei.c:2853 user_path_at include/linux/namei.h:57 [inline] user_statfs+0xa2/0x186 fs/statfs.c:103 __do_sys_statfs+0x92/0xfe fs/statfs.c:195 sys_statfs+0x20/0x2c fs/statfs.c:192 ret_from_syscall+0x0/0x2 Last potentially related work creation: ------------[ cut here ]------------ slab index 1177136 out of bounds (290) for stack id 8451f630 WARNING: CPU: 0 PID: 2047 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2047 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2047 Comm: syz-executor.0 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 : ffffaf8010497e50 gp : ffffffff85863ac0 tp : ffffaf800e6c9840 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf8010497e60 s1 : ffffaf807aadd880 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 2c9669d909bb5600 a5 : 2c9669d909bb5600 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf8010497fc0 s3 : ffffaf80072e9b40 s4 : ffffaf8010496600 s5 : ffffaf8010497600 s6 : 0000000000003fff s7 : ffffaf8010497fb0 s8 : ffffffff8000a4a4 s9 : ffffffffffffc000 s10: ffffaf8010498000 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf8010497958 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: 26533 hardirqs last enabled at (26532): [] seqcount_lockdep_reader_access include/linux/seqlock.h:105 [inline] hardirqs last enabled at (26532): [] read_seqbegin include/linux/seqlock.h:840 [inline] hardirqs last enabled at (26532): [] neigh_hh_output include/net/neighbour.h:495 [inline] hardirqs last enabled at (26532): [] neigh_output include/net/neighbour.h:539 [inline] hardirqs last enabled at (26532): [] ip_finish_output2+0x157a/0x1720 net/ipv4/ip_output.c:221 hardirqs last disabled at (26533): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (26533): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (26402): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (26402): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (26411): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (26411): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (26411): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- Second to last potentially related work creation: ------------[ cut here ]------------ slab index 2097151 out of bounds (290) for stack id ffffffff WARNING: CPU: 0 PID: 2047 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2047 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2047 Comm: syz-executor.0 Tainted: G W 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 : ffffaf8010497e50 gp : ffffffff85863ac0 tp : ffffaf800e6c9840 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf8010497e60 s1 : ffffaf807aadd880 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 2c9669d909bb5600 a5 : 2c9669d909bb5600 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf8010497fc0 s3 : ffffaf80072e9b40 s4 : ffffaf8010496600 s5 : ffffaf8010497600 s6 : 0000000000003fff s7 : ffffaf8010497fb0 s8 : ffffffff8000a4a4 s9 : ffffffffffffc000 s10: ffffaf8010498000 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf8010497958 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 [] describe_object_stacks mm/kasan/report.c:221 [inline] [] describe_object mm/kasan/report.c:231 [inline] [] print_address_description.constprop.0+0x2ae/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: 26533 hardirqs last enabled at (26532): [] seqcount_lockdep_reader_access include/linux/seqlock.h:105 [inline] hardirqs last enabled at (26532): [] read_seqbegin include/linux/seqlock.h:840 [inline] hardirqs last enabled at (26532): [] neigh_hh_output include/net/neighbour.h:495 [inline] hardirqs last enabled at (26532): [] neigh_output include/net/neighbour.h:539 [inline] hardirqs last enabled at (26532): [] ip_finish_output2+0x157a/0x1720 net/ipv4/ip_output.c:221 hardirqs last disabled at (26533): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (26533): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (26402): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (26402): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (26411): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (26411): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (26411): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf8010496600 which belongs to the cache names_cache of size 4096 The buggy address is located 2496 bytes to the right of 4096-byte region [ffffaf8010496600, ffffaf8010497600) The buggy address belongs to the page: page:ffffaf807aadd880 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x90690 head:ffffaf807aadd880 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x9000010200(slab|head|section=18|node=0|zone=0) raw: 0000009000010200 0000000000000000 0000000000000122 ffffaf80072e9b40 raw: 0000000000000000 0000000000070007 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2194, ts 1028513853300, free_ts 1028094329400 __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+0x39c/0x3de mm/slub.c:3243 getname_flags.part.0+0x48/0x2a4 fs/namei.c:138 getname_flags include/linux/audit.h:323 [inline] getname+0x5e/0x90 fs/namei.c:217 do_sys_openat2+0x112/0x31e fs/open.c:1208 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 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] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x278/0x2e0 mm/slub.c:3255 kmalloc include/linux/slab.h:581 [inline] call_modprobe kernel/kmod.c:79 [inline] __request_module+0x2c2/0x922 kernel/kmod.c:170 __rtnl_newlink+0x65a/0xfa0 net/core/rtnetlink.c:3430 rtnl_newlink+0x60/0x8c net/core/rtnetlink.c:3527 rtnetlink_rcv_msg+0x338/0x9a0 net/core/rtnetlink.c:5592 Memory state around the buggy address: ffffaf8010497e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffffaf8010497f00: fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00 00 >ffffaf8010497f80: 00 00 00 00 00 00 00 00 fc fc fc fc f1 f1 f1 f1 ^ ffffaf8010498000: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ffffaf8010498080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================