RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fd873cc3199 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000003 RBP: 00007ffe7f9af080 R08: 0000000000000001 R09: 00007ffe7f9af090 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a R13: 00007ffe7f9af0a0 R14: 00007ffe7f9af0e0 R15: 0000000000000000 ---[ end trace 246292e9e8cb5733 ]--- ================================================================== 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 ffff8881087c0818 by task syz-executor833/382 CPU: 1 PID: 382 Comm: syz-executor833 Tainted: G W 5.10.112-syzkaller-00287-gde64d941a71a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:2278 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+0x44/0xa9 RIP: 0033:0x7fd873cc3199 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 15 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe7f9af058 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fd873cc3199 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000003 RBP: 00007ffe7f9af080 R08: 0000000000000001 R09: 00007ffe7f9af090 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a R13: 00007ffe7f9af0a0 R14: 00007ffe7f9af0e0 R15: 0000000000000000 Allocated by task 382: 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+0x44/0xa9 Freed by task 382: 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:2278 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+0x44/0xa9 The buggy address belongs to the object at ffff8881087c0800 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 24 bytes inside of 96-byte region [ffff8881087c0800, ffff8881087c0860) The buggy address belongs to the page: page:ffffea000421f000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1087c0 flags: 0x8000000000000200(slab) raw: 8000000000000200 ffffea000421f100 0000000700000007 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 1, ts 1068999498, free_ts 0 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:4063 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5113 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:2637 [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 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] acpi_os_allocate_zeroed include/acpi/platform/aclinuxex.h:57 [inline] acpi_ut_evaluate_object+0x101/0x479 drivers/acpi/acpica/uteval.c:50 acpi_ut_execute_power_methods+0x108/0x254 drivers/acpi/acpica/uteval.c:288 acpi_get_object_info+0x63e/0x11eb drivers/acpi/acpica/nsxfname.c:366 acpi_set_pnp_ids drivers/acpi/scan.c:1287 [inline] acpi_init_device_object+0x71f/0x3070 drivers/acpi/scan.c:1636 acpi_add_single_object+0x123/0x18d0 drivers/acpi/scan.c:1671 acpi_bus_check_add+0x42b/0xef0 drivers/acpi/scan.c:1924 acpi_ns_walk_namespace+0x242/0x4ad drivers/acpi/acpica/nswalk.c:231 acpi_walk_namespace+0xf2/0x121 drivers/acpi/acpica/nsxfeval.c:606 acpi_bus_scan+0xd1/0x150 drivers/acpi/scan.c:2105 acpi_scan_init+0x261/0x7fe drivers/acpi/scan.c:2274 page_owner free stack trace missing Memory state around the buggy address: ffff8881087c0700: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8881087c0780: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff8881087c0800: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8881087c0880: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8881087c0900: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================