R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff97e4ea3f R14: 00007f4a64da6300 R15: 0000000000022000 ---[ end trace 0000000000000000 ]--- !!! css_put css ffff888114170000 !!! ================================================================== BUG: KASAN: use-after-free in prog_list_prog kernel/bpf/cgroup.c:213 [inline] BUG: KASAN: use-after-free in prog_list_length kernel/bpf/cgroup.c:226 [inline] BUG: KASAN: use-after-free in compute_effective_progs+0x1d3/0x6d0 kernel/bpf/cgroup.c:279 Read of size 8 at addr ffff88810ad54e18 by task syz-executor.0/416 CPU: 1 PID: 416 Comm: syz-executor.0 Tainted: G W 5.18.0-syzkaller-10038-gd2058918035f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:313 [inline] print_report+0x15f/0x620 mm/kasan/report.c:429 kasan_report+0xe6/0x110 mm/kasan/report.c:491 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:307 prog_list_prog kernel/bpf/cgroup.c:213 [inline] prog_list_length kernel/bpf/cgroup.c:226 [inline] compute_effective_progs+0x1d3/0x6d0 kernel/bpf/cgroup.c:279 update_effective_progs+0x79/0x320 kernel/bpf/cgroup.c:382 __cgroup_bpf_detach+0x2fa/0x550 kernel/bpf/cgroup.c:764 bpf_cgroup_link_release+0xaf/0x270 kernel/bpf/cgroup.c:938 bpf_link_free kernel/bpf/syscall.c:2693 [inline] bpf_link_put+0x1e9/0x270 kernel/bpf/syscall.c:2719 bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2728 __fput+0x3ee/0x880 fs/file_table.c:317 ____fput+0x15/0x20 fs/file_table.c:350 task_work_run+0x147/0x1b0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x8b/0xd0 kernel/entry/common.c:169 exit_to_user_mode_prepare+0x59/0x80 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x24/0x40 kernel/entry/common.c:294 do_syscall_64+0x3b/0x50 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f4a63c890e9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4a64da6168 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f4a63d9bf60 RCX: 00007f4a63c890e9 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000003 RBP: 00007f4a64da61d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff97e4ea3f R14: 00007f4a64da6300 R15: 0000000000022000 Allocated by task 416: 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:436 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:515 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 kasan_kmalloc include/linux/kasan.h:234 [inline] kmem_cache_alloc_trace+0x1f0/0x320 mm/slub.c:3255 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] cgroup_bpf_link_attach+0x12d/0x4f0 kernel/bpf/cgroup.c:1023 link_create+0x5bc/0x8d0 kernel/bpf/syscall.c:4524 __sys_bpf+0x614/0x690 kernel/bpf/syscall.c:4987 __do_sys_bpf kernel/bpf/syscall.c:5021 [inline] __se_sys_bpf kernel/bpf/syscall.c:5019 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5019 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2f/0x50 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 416: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x133/0x170 mm/kasan/common.c:366 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kfree+0xb9/0x200 mm/slub.c:4555 bpf_cgroup_link_dealloc+0x15/0x20 kernel/bpf/cgroup.c:954 bpf_link_free kernel/bpf/syscall.c:2697 [inline] bpf_link_put+0x243/0x270 kernel/bpf/syscall.c:2719 bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2728 __fput+0x3ee/0x880 fs/file_table.c:317 ____fput+0x15/0x20 fs/file_table.c:350 task_work_run+0x147/0x1b0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x8b/0xd0 kernel/entry/common.c:169 exit_to_user_mode_prepare+0x59/0x80 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x24/0x40 kernel/entry/common.c:294 do_syscall_64+0x3b/0x50 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88810ad54e00 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 24 bytes inside of 96-byte region [ffff88810ad54e00, ffff88810ad54e60) The buggy address belongs to the physical page: page:ffffea00042b5500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ad54 flags: 0x8000000000000200(slab|zone=2) raw: 8000000000000200 ffffea0004364980 dead000000000004 ffff888100041780 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, tgid 1 (swapper/0), ts 2124636408, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x15b/0x160 mm/page_alloc.c:2429 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0x412/0x8e0 mm/page_alloc.c:4178 __alloc_pages+0x3d1/0x7c0 mm/page_alloc.c:5406 allocate_slab+0x69/0x480 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x2c2/0x6a0 mm/slub.c:3002 __slab_alloc+0x4a/0x90 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] slab_alloc mm/slub.c:3222 [inline] kmem_cache_alloc_trace+0x221/0x320 mm/slub.c:3253 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] acpi_os_allocate_zeroed include/acpi/platform/aclinuxex.h:57 [inline] acpi_evaluate_object+0x155/0xac6 drivers/acpi/acpica/nsxfeval.c:177 acpi_evaluate_integer+0x112/0x230 drivers/acpi/utils.c:260 acpi_bus_get_status_handle drivers/acpi/bus.c:84 [inline] acpi_bus_get_status+0x14e/0x250 drivers/acpi/bus.c:113 acpi_serdev_check_resources drivers/tty/serdev/core.c:645 [inline] acpi_serdev_add_device+0x12a/0x770 drivers/tty/serdev/core.c:717 acpi_ns_walk_namespace+0x242/0x4a5 acpi_walk_namespace+0xf2/0x121 drivers/acpi/acpica/nsxfeval.c:606 acpi_serdev_register_devices drivers/tty/serdev/core.c:745 [inline] serdev_controller_add+0x36e/0x430 drivers/tty/serdev/core.c:785 serdev_tty_port_register+0x17b/0x280 drivers/tty/serdev/serdev-ttyport.c:289 tty_port_register_device_attr_serdev+0xcd/0x140 drivers/tty/tty_port.c:171 page_owner free stack trace missing Memory state around the buggy address: ffff88810ad54d00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88810ad54d80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88810ad54e00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88810ad54e80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88810ad54f00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ================================================================== !!! css_put css ffff888114170000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff88810023a000 !!! !!! css_put css ffff88810023a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!! !!! css_put css ffff888113f9a000 !!!