================================================================== BUG: KASAN: slab-use-after-free in consumer_filter kernel/events/uprobes.c:869 [inline] BUG: KASAN: slab-use-after-free in filter_chain+0xf6/0x110 kernel/events/uprobes.c:880 Read of size 8 at addr ffff888023a65530 by task syz.4.1628/9987 CPU: 0 UID: 0 PID: 9987 Comm: syz.4.1628 Not tainted 6.11.0-rc3-syzkaller-00279-ge5fa841af679 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 consumer_filter kernel/events/uprobes.c:869 [inline] filter_chain+0xf6/0x110 kernel/events/uprobes.c:880 uprobe_mmap+0x46b/0x1240 kernel/events/uprobes.c:1387 mmap_region+0x1228/0x2760 mm/mmap.c:3058 do_mmap+0xbfb/0xfb0 mm/mmap.c:1468 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:588 ksys_mmap_pgoff+0x332/0x5d0 mm/mmap.c:1514 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:79 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:79 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7714579e79 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f771535b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f7714715f80 RCX: 00007f7714579e79 RDX: 0000000000000001 RSI: 0000000000400000 RDI: 0000000020000000 RBP: 00007f77145e7916 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000000010012 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7714715f80 R15: 00007fffc982e0c8 Allocated by task 9612: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] percpu_ref_init+0xd9/0x400 lib/percpu-refcount.c:76 ioctx_alloc+0x2d2/0x1fd0 fs/aio.c:782 __do_sys_io_setup fs/aio.c:1399 [inline] __se_sys_io_setup fs/aio.c:1382 [inline] __x64_sys_io_setup+0xc9/0x210 fs/aio.c:1382 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5353: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x12a/0x3b0 mm/slub.c:4594 percpu_ref_exit+0xfb/0x150 lib/percpu-refcount.c:146 free_ioctx+0x56/0xa0 fs/aio.c:625 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:3106 call_rcu_hurry include/linux/rcupdate.h:113 [inline] __percpu_ref_switch_to_atomic lib/percpu-refcount.c:233 [inline] __percpu_ref_switch_mode+0x3b7/0x900 lib/percpu-refcount.c:281 percpu_ref_kill_and_confirm+0x8c/0x180 lib/percpu-refcount.c:395 percpu_ref_kill include/linux/percpu-refcount.h:149 [inline] kill_ioctx+0x1d4/0x2a0 fs/aio.c:880 exit_aio+0x1b5/0x360 fs/aio.c:922 __mmput+0x81/0x480 kernel/fork.c:1342 mmput+0x62/0x70 kernel/fork.c:1367 exit_mm kernel/exit.c:571 [inline] do_exit+0x9bf/0x2bb0 kernel/exit.c:869 do_group_exit+0xd3/0x2a0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1040 x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888023a65500 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes inside of freed 64-byte region [ffff888023a65500, ffff888023a65540) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888023a65500 pfn:0x23a65 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000200 ffff8880158418c0 ffffea0000b20250 ffffea0000b19990 raw: ffff888023a65500 0000000000200014 00000001fdffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 4673, tgid 4673 (udevadm), ts 29626237021, free_ts 29626124965 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3442 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4700 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x4e/0xf0 mm/slub.c:2321 allocate_slab mm/slub.c:2484 [inline] new_slab+0x84/0x260 mm/slub.c:2537 ___slab_alloc+0xdac/0x1870 mm/slub.c:3723 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_noprof+0x367/0x400 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] tomoyo_encode2+0x100/0x3e0 security/tomoyo/realpath.c:45 tomoyo_encode+0x29/0x50 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x19d/0x720 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x2a7/0x3b0 security/tomoyo/file.c:771 tomoyo_file_open+0x71/0x90 security/tomoyo/tomoyo.c:334 security_file_open+0x78/0x8b0 security/security.c:2988 do_dentry_open+0x5c7/0x15f0 fs/open.c:946 vfs_open+0x82/0x3f0 fs/open.c:1089 page last free pid 4673 tgid 4673 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2612 selinux_genfs_get_sid security/selinux/hooks.c:1343 [inline] inode_doinit_with_dentry+0xac4/0x12c0 security/selinux/hooks.c:1541 selinux_d_instantiate+0x26/0x30 security/selinux/hooks.c:6350 security_d_instantiate+0x57/0xf0 security/security.c:3942 d_splice_alias+0x94/0xdf0 fs/dcache.c:2982 kernfs_iop_lookup+0x286/0x330 fs/kernfs/dir.c:1229 lookup_open.isra.0+0x928/0x13c0 fs/namei.c:3556 open_last_lookups fs/namei.c:3647 [inline] path_openat+0xa3b/0x2d20 fs/namei.c:3883 do_filp_open+0x1dc/0x430 fs/namei.c:3913 do_sys_openat2+0x17a/0x1e0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888023a65400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888023a65480: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc >ffff888023a65500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888023a65580: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff888023a65600: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================