================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf800f037eb0 by task syz-executor.0/2065 CPU: 0 PID: 2065 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 [] kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 Allocated by task 1102394680: (stack is not available) Freed by task 2058: 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_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 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 Last potentially related work creation: ------------[ cut here ]------------ slab index 1506808 out of bounds (289) for stack id 8456fdf8 WARNING: CPU: 0 PID: 2065 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2065 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2065 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 : ffffaf800f037d70 gp : ffffffff85863ac0 tp : ffffaf800e39c8c0 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800f037d80 s1 : ffffaf807aa81d80 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : ca154765d1637f00 a5 : ca154765d1637f00 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800f037eb0 s3 : ffffaf8007202140 s4 : ffffaf800f036000 s5 : ffffaf800f037000 s6 : 0000000000003fff s7 : ffffaf800f037e50 s8 : 0000000000400000 s9 : ffffffffffffc000 s10: ffffaf800f037f20 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800f037878 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 [] kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 irq event stamp: 26529 hardirqs last enabled at (26528): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (26528): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (26529): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (26529): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (26408): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (26408): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (26445): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (26445): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (26445): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- Second to last potentially related work creation: ------------[ cut here ]------------ slab index 2076544 out of bounds (289) for stack id ffffaf80 WARNING: CPU: 0 PID: 2065 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2065 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2065 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 : ffffaf800f037d70 gp : ffffffff85863ac0 tp : ffffaf800e39c8c0 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800f037d80 s1 : ffffaf807aa81d80 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : ca154765d1637f00 a5 : ca154765d1637f00 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800f037eb0 s3 : ffffaf8007202140 s4 : ffffaf800f036000 s5 : ffffaf800f037000 s6 : 0000000000003fff s7 : ffffaf800f037e50 s8 : 0000000000400000 s9 : ffffffffffffc000 s10: ffffaf800f037f20 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800f037878 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 [] kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 irq event stamp: 26529 hardirqs last enabled at (26528): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (26528): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (26529): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (26529): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (26408): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (26408): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (26445): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (26445): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (26445): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf800f036000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3760 bytes to the right of 4096-byte region [ffffaf800f036000, ffffaf800f037000) The buggy address belongs to the page: page:ffffaf807aa81d80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8f230 head:ffffaf807aa81d80 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 0000000000000000 0000000000000001 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 2046, ts 382765852200, free_ts 374099372300 __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_super+0x4e/0x52a fs/super.c:202 sget_fc+0xc8/0x3a0 fs/super.c:530 kernfs_get_tree+0xf8/0x4b4 fs/kernfs/mount.c:332 cgroup_do_get_tree+0x9c/0x3d6 kernel/cgroup/cgroup.c:2099 cgroup1_get_tree+0x410/0x894 kernel/cgroup/cgroup-v1.c:1221 vfs_get_tree+0x4a/0x19c fs/super.c:1497 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 __unfreeze_partials+0x16a/0x18e mm/slub.c:2536 put_cpu_partial+0xf6/0x162 mm/slub.c:2612 __slab_free+0x166/0x29c mm/slub.c:3378 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+0x338/0x3de mm/slub.c:3243 getname_flags.part.0+0x48/0x2a4 fs/namei.c:138 getname_flags+0x66/0x9c include/linux/audit.h:323 Memory state around the buggy address: ffffaf800f037d80: 00 00 00 00 00 00 00 00 fc fc fc fc 00 00 00 00 ffffaf800f037e00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffffaf800f037e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffffaf800f037f00: f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 ffffaf800f037f80: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================