================================================================== BUG: KASAN: use-after-free in sk_psock_verdict_data_ready+0xc2/0x1a0 net/core/skmsg.c:1219 Read of size 8 at addr ffff88812862f420 by task syz.4.21847/3508 CPU: 0 PID: 3508 Comm: syz.4.21847 Tainted: G W 5.15.168-syzkaller-00719-g101e665d55a8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 sk_psock_verdict_data_ready+0xc2/0x1a0 net/core/skmsg.c:1219 unix_stream_sendmsg+0x8fd/0x1060 net/unix/af_unix.c:2106 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2526 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f9d4d38b809 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:00007f9d4ba02058 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9d4d550fa0 RCX: 00007f9d4d38b809 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000009 RBP: 00007f9d4d3fe93e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9d4d550fa0 R15: 00007ffe6e893858 Allocated by task 3508: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253 sock_alloc_inode+0x1b/0xb0 net/socket.c:303 alloc_inode fs/inode.c:236 [inline] new_inode_pseudo+0x64/0x220 fs/inode.c:976 sock_alloc net/socket.c:626 [inline] __sock_create+0x132/0x7e0 net/socket.c:1450 sock_create net/socket.c:1542 [inline] __sys_socketpair+0x29f/0x6e0 net/socket.c:1642 __do_sys_socketpair net/socket.c:1695 [inline] __se_sys_socketpair net/socket.c:1692 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1692 x64_sys_call+0x19b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:54 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 3495: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3519 [inline] kmem_cache_free+0x116/0x2e0 mm/slub.c:3535 sock_free_inode+0x20/0x30 net/socket.c:324 i_callback+0x4b/0x70 fs/inode.c:225 rcu_do_batch+0x57a/0xc10 kernel/rcu/tree.c:2523 rcu_core+0x517/0x1020 kernel/rcu/tree.c:2763 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776 handle_softirqs+0x25e/0x5c0 kernel/softirq.c:565 __do_softirq kernel/softirq.c:603 [inline] invoke_softirq kernel/softirq.c:425 [inline] __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:652 irq_exit_rcu+0x9/0x10 kernel/softirq.c:664 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline] sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0x123/0x10b0 kernel/rcu/tree.c:3125 destroy_inode fs/inode.c:291 [inline] evict+0x87d/0x930 fs/inode.c:637 iput_final fs/inode.c:1744 [inline] iput+0x63b/0x7e0 fs/inode.c:1770 dentry_unlink_inode+0x34e/0x430 fs/dcache.c:380 __dentry_kill+0x447/0x660 fs/dcache.c:586 dentry_kill+0xc0/0x2a0 dput+0x45/0x80 fs/dcache.c:893 __fput+0x59d/0x8c0 fs/file_table.c:288 ____fput+0x15/0x20 fs/file_table.c:308 task_work_run+0x129/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0x123/0x10b0 kernel/rcu/tree.c:3125 destroy_inode fs/inode.c:291 [inline] evict+0x87d/0x930 fs/inode.c:637 iput_final fs/inode.c:1744 [inline] iput+0x63b/0x7e0 fs/inode.c:1770 dentry_unlink_inode+0x34e/0x430 fs/dcache.c:380 __dentry_kill+0x447/0x660 fs/dcache.c:586 dentry_kill+0xc0/0x2a0 dput+0x45/0x80 fs/dcache.c:893 __fput+0x59d/0x8c0 fs/file_table.c:288 ____fput+0x15/0x20 fs/file_table.c:308 task_work_run+0x129/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88812862f400 which belongs to the cache sock_inode_cache of size 896 The buggy address is located 32 bytes inside of 896-byte region [ffff88812862f400, ffff88812862f780) The buggy address belongs to the page: page:ffffea0004a18b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12862c head:ffffea0004a18b00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004447900 0000000400000004 ffff8881081abc80 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 299, ts 2360161684799, free_ts 2351827447527 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5779 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0x134/0x200 mm/slub.c:3253 sock_alloc_inode+0x1b/0xb0 net/socket.c:303 alloc_inode fs/inode.c:236 [inline] new_inode_pseudo+0x64/0x220 fs/inode.c:976 sock_alloc net/socket.c:626 [inline] __sock_create+0x132/0x7e0 net/socket.c:1450 sock_create net/socket.c:1542 [inline] __sys_socket+0x132/0x370 net/socket.c:1584 __do_sys_socket net/socket.c:1593 [inline] __se_sys_socket net/socket.c:1591 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1591 x64_sys_call+0x147/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:42 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5855 __free_slab+0xec/0x1d0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab mm/slub.c:2041 [inline] __unfreeze_partials+0x165/0x1a0 mm/slub.c:2527 put_cpu_partial+0xc4/0x120 mm/slub.c:2607 __slab_free+0x1c8/0x290 mm/slub.c:3388 do_slab_free mm/slub.c:3507 [inline] ___cache_free+0x109/0x120 mm/slub.c:3526 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253 alloc_inode fs/inode.c:238 [inline] new_inode_pseudo+0x7c/0x220 fs/inode.c:976 __ns_get_path+0x16a/0x480 fs/nsfs.c:80 Memory state around the buggy address: ffff88812862f300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88812862f380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88812862f400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88812862f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88812862f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================