---[ end trace 71a8e909f523c1a2 ]--- ================================================================== BUG: KASAN: use-after-free in prog_list_prog kernel/bpf/cgroup.c:174 [inline] BUG: KASAN: use-after-free in prog_list_length kernel/bpf/cgroup.c:187 [inline] BUG: KASAN: use-after-free in compute_effective_progs+0x1d3/0x6e0 kernel/bpf/cgroup.c:240 Read of size 8 at addr ffff88811820e118 by task syz-executor320/373 CPU: 1 PID: 373 Comm: syz-executor320 Tainted: G W 5.10.134-syzkaller-01772-gf6ce9a9115d5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3c0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 prog_list_prog kernel/bpf/cgroup.c:174 [inline] prog_list_length kernel/bpf/cgroup.c:187 [inline] compute_effective_progs+0x1d3/0x6e0 kernel/bpf/cgroup.c:240 update_effective_progs+0x79/0x320 kernel/bpf/cgroup.c:343 __cgroup_bpf_detach+0x312/0x570 kernel/bpf/cgroup.c:689 bpf_cgroup_link_release+0x94/0x260 kernel/bpf/cgroup.c:833 bpf_link_free kernel/bpf/syscall.c:2350 [inline] bpf_link_put+0x1e9/0x270 kernel/bpf/syscall.c:2376 bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2384 __fput+0x348/0x7c0 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x147/0x1b0 kernel/task_work.c:154 ptrace_notify+0x29a/0x340 kernel/signal.c:2279 ptrace_report_syscall include/linux/tracehook.h:66 [inline] tracehook_report_syscall_exit include/linux/tracehook.h:129 [inline] arch_syscall_exit_tracehook include/linux/entry-common.h:284 [inline] syscall_exit_work+0x7c/0x130 kernel/entry/common.c:231 syscall_exit_to_user_mode_prepare kernel/entry/common.c:258 [inline] syscall_exit_to_user_mode+0x6a/0xa0 kernel/entry/common.c:264 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f88784ac2f3 Code: c7 c2 c0 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb ba 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 RSP: 002b:00007ffd84b07208 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000009 RCX: 00007f88784ac2f3 RDX: ffffffffffffffc0 RSI: 0000000000000007 RDI: 0000000000000008 RBP: 00007ffd84b07230 R08: 0000000000000001 R09: 00007ffd84b07240 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009 R13: 00007ffd84b07250 R14: 00007ffd84b07290 R15: 0000000000000000 Allocated by task 373: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:428 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:507 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:269 [inline] kmem_cache_alloc_trace+0x1dd/0x330 mm/slub.c:2983 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] cgroup_bpf_link_attach+0x12e/0x4a0 kernel/bpf/cgroup.c:918 link_create+0x540/0x6e0 kernel/bpf/syscall.c:4092 __do_sys_bpf+0x528/0x6c0 kernel/bpf/syscall.c:4497 __se_sys_bpf kernel/bpf/syscall.c:4383 [inline] __x64_sys_bpf+0x7a/0x90 kernel/bpf/syscall.c:4383 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Freed by task 373: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:360 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:368 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1604 [inline] slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1630 slab_free mm/slub.c:3212 [inline] kfree+0xc3/0x290 mm/slub.c:4200 bpf_cgroup_link_dealloc+0x15/0x20 kernel/bpf/cgroup.c:849 bpf_link_free kernel/bpf/syscall.c:2354 [inline] bpf_link_put+0x243/0x270 kernel/bpf/syscall.c:2376 bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2384 __fput+0x348/0x7c0 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x147/0x1b0 kernel/task_work.c:154 ptrace_notify+0x29a/0x340 kernel/signal.c:2279 ptrace_report_syscall include/linux/tracehook.h:66 [inline] tracehook_report_syscall_exit include/linux/tracehook.h:129 [inline] arch_syscall_exit_tracehook include/linux/entry-common.h:284 [inline] syscall_exit_work+0x7c/0x130 kernel/entry/common.c:231 syscall_exit_to_user_mode_prepare kernel/entry/common.c:258 [inline] syscall_exit_to_user_mode+0x6a/0xa0 kernel/entry/common.c:264 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xc6 The buggy address belongs to the object at ffff88811820e100 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 24 bytes inside of 96-byte region [ffff88811820e100, ffff88811820e160) The buggy address belongs to the page: page:ffffea0004608380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11820e flags: 0x8000000000000200(slab) raw: 8000000000000200 dead000000000100 dead000000000122 ffff888100043680 raw: 0000000000000000 0000000080200020 00000001ffffffff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 361, ts 16642756972, free_ts 16614003897 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2385 [inline] prep_new_page mm/page_alloc.c:2391 [inline] get_page_from_freelist+0x745/0x760 mm/page_alloc.c:4067 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5117 alloc_slab_page mm/slub.c:1815 [inline] allocate_slab+0x78/0x540 mm/slub.c:1817 new_slab mm/slub.c:1878 [inline] new_slab_objects mm/slub.c:2636 [inline] ___slab_alloc+0x131/0x2e0 mm/slub.c:2800 __slab_alloc+0x63/0xa0 mm/slub.c:2840 slab_alloc_node mm/slub.c:2922 [inline] slab_alloc mm/slub.c:2964 [inline] kmem_cache_alloc_trace+0x20e/0x330 mm/slub.c:2981 kmem_cache_alloc_node_trace include/linux/slab.h:440 [inline] kmalloc_node include/linux/slab.h:570 [inline] kzalloc_node include/linux/slab.h:675 [inline] __get_vm_area_node+0x134/0x200 mm/vmalloc.c:2077 __vmalloc_node_range+0xd5/0x6d0 mm/vmalloc.c:2560 __vmalloc_node mm/vmalloc.c:2608 [inline] __vmalloc+0x7a/0x90 mm/vmalloc.c:2622 bpf_prog_alloc_no_stats+0x36/0x2d0 kernel/bpf/core.c:91 bpf_prog_alloc+0x21/0x1f0 kernel/bpf/core.c:119 bpf_prog_create_from_user+0xa0/0x400 net/core/filter.c:1413 seccomp_prepare_filter kernel/seccomp.c:658 [inline] seccomp_prepare_user_filter kernel/seccomp.c:695 [inline] seccomp_set_mode_filter kernel/seccomp.c:1803 [inline] do_seccomp+0x8bd/0x13a0 kernel/seccomp.c:1923 prctl_set_seccomp+0x4d/0x60 kernel/seccomp.c:1976 __do_sys_prctl+0x8fb/0x12e0 kernel/sys.c:2515 __se_sys_prctl kernel/sys.c:2433 [inline] __x64_sys_prctl+0xbf/0xd0 kernel/sys.c:2433 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1331 [inline] free_pcp_prepare+0x18c/0x1c0 mm/page_alloc.c:1405 free_unref_page_prepare mm/page_alloc.c:3291 [inline] free_unref_page+0x6a/0x220 mm/page_alloc.c:3345 __put_single_page mm/swap.c:102 [inline] __put_page+0xb1/0xd0 mm/swap.c:133 put_page include/linux/mm.h:1253 [inline] anon_pipe_buf_release+0x18d/0x210 fs/pipe.c:137 pipe_buf_release include/linux/pipe_fs_i.h:201 [inline] pipe_read+0x5c1/0x1070 fs/pipe.c:323 call_read_iter include/linux/fs.h:1941 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x9e2/0xbf0 fs/read_write.c:496 ksys_read+0x198/0x2c0 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:642 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Memory state around the buggy address: ffff88811820e000: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88811820e080: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88811820e100: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88811820e180: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88811820e200: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================