================================================================== BUG: KASAN: slab-use-after-free in queue_cnt drivers/ptp/ptp_private.h:89 [inline] BUG: KASAN: slab-use-after-free in ptp_read+0x5e4/0x820 drivers/ptp/ptp_chardev.c:547 Read of size 4 at addr ffff88807b809004 by task syz-executor.1/32033 CPU: 0 PID: 32033 Comm: syz-executor.1 Not tainted 6.6.0-syzkaller-15029-gbe3ca57cfb77 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x142/0x170 mm/kasan/report.c:588 queue_cnt drivers/ptp/ptp_private.h:89 [inline] ptp_read+0x5e4/0x820 drivers/ptp/ptp_chardev.c:547 posix_clock_read+0x12f/0x190 kernel/time/posix-clock.c:51 vfs_read+0x289/0xb00 fs/read_write.c:468 ksys_read+0x1a0/0x2c0 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7efdd4a7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007efdd57630c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007efdd4b9bf80 RCX: 00007efdd4a7cae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007efdd4ac847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007efdd4b9bf80 R15: 00007ffe8fcd6798 Allocated by task 32033: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] ptp_open+0xd9/0x430 drivers/ptp/ptp_chardev.c:112 posix_clock_open+0x155/0x1f0 kernel/time/posix-clock.c:134 chrdev_open+0x5ab/0x630 fs/char_dev.c:414 do_dentry_open+0x8fd/0x1590 fs/open.c:948 do_open fs/namei.c:3622 [inline] path_openat+0x2845/0x3280 fs/namei.c:3779 do_filp_open+0x234/0x490 fs/namei.c:3809 do_sys_openat2+0x13e/0x1d0 fs/open.c:1440 do_sys_open fs/open.c:1455 [inline] __do_sys_openat fs/open.c:1471 [inline] __se_sys_openat fs/open.c:1466 [inline] __x64_sys_openat+0x247/0x290 fs/open.c:1466 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Freed by task 32036: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook mm/slub.c:1826 [inline] slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0x263/0x3a0 mm/slub.c:3822 ptp_release+0x1ce/0x1e0 drivers/ptp/ptp_chardev.c:150 ptp_read+0x17f/0x820 drivers/ptp/ptp_chardev.c:589 posix_clock_read+0x12f/0x190 kernel/time/posix-clock.c:51 do_loop_readv_writev fs/read_write.c:755 [inline] do_iter_read+0x572/0xd90 fs/read_write.c:797 vfs_readv fs/read_write.c:915 [inline] do_readv+0x26f/0x460 fs/read_write.c:952 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:492 __call_rcu_common kernel/rcu/tree.c:2667 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2781 generic_shutdown_super+0x13a/0x2c0 fs/super.c:696 kill_block_super+0x44/0x90 fs/super.c:1667 deactivate_locked_super+0xc1/0x130 fs/super.c:484 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1256 task_work_run+0x24a/0x300 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296 do_syscall_64+0x50/0x110 arch/x86/entry/common.c:88 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff88807b808000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4100 bytes inside of freed 8192-byte region [ffff88807b808000, ffff88807b80a000) The buggy address belongs to the physical page: page:ffffea0001ee0200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b808 head:ffffea0001ee0200 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888012c42280 ffffea0000d6ba00 dead000000000002 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 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 4901, tgid 4901 (dhcpcd-run-hook), ts 51065175100, free_ts 51060710922 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0x339a/0x3530 mm/page_alloc.c:3312 __alloc_pages+0x255/0x670 mm/page_alloc.c:4568 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133 alloc_slab_page+0x6a/0x160 mm/slub.c:1870 allocate_slab mm/slub.c:2017 [inline] new_slab+0x84/0x2f0 mm/slub.c:2070 ___slab_alloc+0xc85/0x1310 mm/slub.c:3223 __slab_alloc mm/slub.c:3322 [inline] __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x21d/0x300 mm/slub.c:3517 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_print_bprm security/tomoyo/audit.c:26 [inline] tomoyo_init_log+0x11cd/0x2040 security/tomoyo/audit.c:264 tomoyo_supervisor+0x386/0x11f0 security/tomoyo/common.c:2089 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] tomoyo_env_perm+0x178/0x210 security/tomoyo/environ.c:63 tomoyo_environ security/tomoyo/domain.c:672 [inline] tomoyo_find_next_domain+0x1383/0x1cf0 security/tomoyo/domain.c:878 tomoyo_bprm_check_security+0x114/0x170 security/tomoyo/tomoyo.c:101 security_bprm_check+0x63/0xa0 security/security.c:1103 search_binary_handler fs/exec.c:1725 [inline] exec_binprm fs/exec.c:1779 [inline] bprm_execve+0x95f/0x18a0 fs/exec.c:1854 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x92a/0xa50 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 discard_slab mm/slub.c:2116 [inline] __unfreeze_partials+0x1dc/0x220 mm/slub.c:2655 put_cpu_partial+0x17b/0x250 mm/slub.c:2731 __slab_free+0x2b6/0x390 mm/slub.c:3679 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6c/0x3c0 mm/slab.h:763 slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x1d0/0x300 mm/slub.c:3517 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_dump_page+0x119/0x6e0 security/tomoyo/domain.c:905 tomoyo_scan_bprm security/tomoyo/condition.c:130 [inline] tomoyo_condition+0x2395/0x3220 security/tomoyo/condition.c:1120 tomoyo_check_acl+0x16e/0x3f0 security/tomoyo/domain.c:177 tomoyo_execute_permission+0x13d/0x410 security/tomoyo/file.c:615 tomoyo_find_next_domain+0x404/0x1cf0 security/tomoyo/domain.c:752 Memory state around the buggy address: ffff88807b808f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807b808f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807b809000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807b809080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807b809100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================