================================================================== 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 ffff88805711d8b0 by task syz.1.5356/22702 CPU: 0 PID: 22702 Comm: syz.1.5356 Not tainted 6.10.0-rc7-syzkaller-00076-g9d9a2f29aefd #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:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 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:2987 do_mmap+0xbc7/0xf60 mm/mmap.c:1397 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:573 ksys_mmap_pgoff+0x332/0x5d0 mm/mmap.c:1443 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf746a579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5d6157c EFLAGS: 00000292 ORIG_RAX: 00000000000000c0 RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 0000000000003000 RDX: 0000000000000005 RSI: 0000000000000012 RDI: 000000000000000a RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 21783: 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_node_noprof include/linux/slab.h:677 [inline] __get_vm_area_node+0xe1/0x2d0 mm/vmalloc.c:3108 __vmalloc_node_range_noprof+0x276/0x1520 mm/vmalloc.c:3800 __vmalloc_node_noprof mm/vmalloc.c:3905 [inline] vmalloc_noprof+0x6b/0x90 mm/vmalloc.c:3938 xt_compat_init_offsets+0xe1/0x1f0 net/netfilter/x_tables.c:733 ebt_compat_init_offsets net/bridge/netfilter/ebtables.c:1832 [inline] compat_table_info+0x11b/0x830 net/bridge/netfilter/ebtables.c:1843 compat_copy_everything_to_user+0xf26/0x1120 net/bridge/netfilter/ebtables.c:1883 compat_do_ebt_get_ctl+0x72e/0xb90 net/bridge/netfilter/ebtables.c:2432 do_ebt_get_ctl+0x321/0x7b0 net/bridge/netfilter/ebtables.c:2460 nf_getsockopt+0x79/0xe0 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x18e/0x1e0 net/ipv4/ip_sockglue.c:1777 tcp_getsockopt+0x9e/0x100 net/ipv4/tcp.c:4406 do_sock_getsockopt+0x2e5/0x7c0 net/socket.c:2374 __sys_getsockopt+0x1a1/0x270 net/socket.c:2403 __do_compat_sys_socketcall+0x42b/0x700 net/compat.c:494 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 21783: 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:2196 [inline] slab_free mm/slub.c:4438 [inline] kfree+0x12a/0x3b0 mm/slub.c:4559 vfree+0x25a/0x7a0 mm/vmalloc.c:3368 xt_compat_flush_offsets+0x8f/0x160 net/netfilter/x_tables.c:691 compat_do_ebt_get_ctl+0x398/0xb90 net/bridge/netfilter/ebtables.c:2438 do_ebt_get_ctl+0x321/0x7b0 net/bridge/netfilter/ebtables.c:2460 nf_getsockopt+0x79/0xe0 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x18e/0x1e0 net/ipv4/ip_sockglue.c:1777 tcp_getsockopt+0x9e/0x100 net/ipv4/tcp.c:4406 do_sock_getsockopt+0x2e5/0x7c0 net/socket.c:2374 __sys_getsockopt+0x1a1/0x270 net/socket.c:2403 __do_compat_sys_socketcall+0x42b/0x700 net/compat.c:494 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff88805711d880 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes inside of freed 64-byte region [ffff88805711d880, ffff88805711d8c0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805711d400 pfn:0x5711d flags: 0x4fff00000000200(workingset|node=1|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 04fff00000000200 ffff8880154428c0 ffffea00015fad10 ffffea00015a7690 raw: ffff88805711d400 0000000000200013 00000001ffffefff 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5208, tgid 5208 (syz-executor), ts 59335455025, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1473 prep_new_page mm/page_alloc.c:1481 [inline] get_page_from_freelist+0x1353/0x2e50 mm/page_alloc.c:3425 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4683 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x56/0x110 mm/slub.c:2265 allocate_slab mm/slub.c:2428 [inline] new_slab+0x84/0x260 mm/slub.c:2481 ___slab_alloc+0xdac/0x1870 mm/slub.c:3667 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3990 [inline] __do_kmalloc_node mm/slub.c:4122 [inline] __kmalloc_noprof+0x37f/0x420 mm/slub.c:4136 kmalloc_noprof include/linux/slab.h:664 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] kobject_get_path+0xcb/0x230 lib/kobject.c:161 kobject_uevent_env+0x28f/0x15f0 lib/kobject_uevent.c:530 __kobject_del+0x168/0x1f0 lib/kobject.c:601 kobject_cleanup lib/kobject.c:680 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x31c/0x5b0 lib/kobject.c:737 netdev_queue_update_kobjects+0x4a2/0x640 net/core/net-sysfs.c:1854 netif_set_real_num_tx_queues+0x168/0x880 net/core/dev.c:2940 veth_init_queues+0xe1/0x190 drivers/net/veth.c:1755 veth_newlink+0x627/0xa10 drivers/net/veth.c:1878 page_owner free stack trace missing Memory state around the buggy address: ffff88805711d780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88805711d800: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88805711d880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88805711d900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88805711d980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi