================================================================== 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 ffff888030c76430 by task syz.3.592/6958 CPU: 3 UID: 0 PID: 6958 Comm: syz.3.592 Not tainted 6.11.0-rc7-syzkaller-00020-g8d8d276ba2fb #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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: 0033:0x7f939fb7def9 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:00007f93a0994038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f939fd35f80 RCX: 00007f939fb7def9 RDX: 0000000000000001 RSI: 0000000000003000 RDI: 0000000020000000 RBP: 00007f939fbf09f6 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000010012 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f939fd35f80 R15: 00007ffdfdf12a98 Allocated by task 6902: 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 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4162 [inline] __kmalloc_noprof+0x1e8/0x400 mm/slub.c:4174 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 do_open fs/namei.c:3727 [inline] path_openat+0x2141/0x2d20 fs/namei.c:3886 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 Freed by task 6902: 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:2256 [inline] slab_free mm/slub.c:4477 [inline] kfree+0x12a/0x3b0 mm/slub.c:4598 tomoyo_check_open_permission+0x19d/0x3b0 security/tomoyo/file.c:786 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 do_open fs/namei.c:3727 [inline] path_openat+0x2141/0x2d20 fs/namei.c:3886 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 The buggy address belongs to the object at ffff888030c76400 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes inside of freed 64-byte region [ffff888030c76400, ffff888030c76440) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888030c76380 pfn:0x30c76 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000200 ffff88801ac428c0 ffffea0000a0e890 ffffea00008f5a90 raw: ffff888030c76380 000000000020001d 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1104, tgid 1104 (kworker/u32:7), ts 50251381455, free_ts 50112945215 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1500 prep_new_page mm/page_alloc.c:1508 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3446 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4702 __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:2325 allocate_slab mm/slub.c:2488 [inline] new_slab+0x84/0x260 mm/slub.c:2541 ___slab_alloc+0xdac/0x1870 mm/slub.c:3727 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3817 __slab_alloc_node mm/slub.c:3870 [inline] slab_alloc_node mm/slub.c:4029 [inline] __kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4188 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] sctp_inet6addr_event+0x47d/0x900 net/sctp/ipv6.c:86 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 atomic_notifier_call_chain+0x71/0x1c0 kernel/notifier.c:231 ipv6_add_addr+0x13f5/0x2060 net/ipv6/addrconf.c:1180 addrconf_add_linklocal+0x2a6/0x620 net/ipv6/addrconf.c:3315 addrconf_addr_gen+0x36f/0x3c0 net/ipv6/addrconf.c:3446 addrconf_dev_config net/ipv6/addrconf.c:3492 [inline] addrconf_init_auto_addrs+0x446/0x820 net/ipv6/addrconf.c:3570 addrconf_notify+0x6ef/0x19d0 net/ipv6/addrconf.c:3743 page last free pid 24 tgid 24 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2619 __folio_put+0x31c/0x3e0 mm/swap.c:128 folio_put include/linux/mm.h:1490 [inline] free_page_and_swap_cache+0x249/0x2c0 mm/swap_state.c:308 __tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline] __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:282 rcu_do_batch kernel/rcu/tree.c:2569 [inline] rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2843 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 run_ksoftirqd kernel/softirq.c:928 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:920 smpboot_thread_fn+0x661/0xa10 kernel/smpboot.c:164 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 Memory state around the buggy address: ffff888030c76300: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888030c76380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888030c76400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888030c76480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff888030c76500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================