R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009 R13: 00007ffed93c1140 R14: 00007ffed93c1180 R15: 0000000000000000 ---[ end trace 0000000000000000 ]--- ================================================================== 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+0x1a1/0x620 kernel/bpf/cgroup.c:240 Read of size 8 at addr ffff8881089f8c98 by task syz-executor165/411 CPU: 1 PID: 411 Comm: syz-executor165 Tainted: G W 5.18.0-rc1-syzkaller #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+0x166/0x620 mm/kasan/report.c:429 kasan_report+0xee/0x120 mm/kasan/report.c:491 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:307 prog_list_prog kernel/bpf/cgroup.c:174 [inline] prog_list_length kernel/bpf/cgroup.c:187 [inline] compute_effective_progs+0x1a1/0x620 kernel/bpf/cgroup.c:240 update_effective_progs+0x79/0x320 kernel/bpf/cgroup.c:343 __cgroup_bpf_detach+0x2fa/0x550 kernel/bpf/cgroup.c:725 bpf_cgroup_link_release+0x94/0x260 kernel/bpf/cgroup.c:899 bpf_link_free kernel/bpf/syscall.c:2469 [inline] bpf_link_put+0x1e9/0x270 kernel/bpf/syscall.c:2495 bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2504 __fput+0x3ee/0x890 fs/file_table.c:317 ____fput+0x15/0x20 fs/file_table.c:350 task_work_run+0x147/0x1b0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0xe0/0xf0 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+0x3e/0x50 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f7c30942243 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:00007ffed93c10f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000009 RCX: 00007f7c30942243 RDX: 0000000000000120 RSI: 0000000000000005 RDI: 0000000000000008 RBP: 00007ffed93c1120 R08: 0000000000000001 R09: 00007ffed93c1130 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009 R13: 00007ffed93c1140 R14: 00007ffed93c1180 R15: 0000000000000000 Allocated by task 411: 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+0x22e/0x3a0 mm/slub.c:3258 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] cgroup_bpf_link_attach+0x12e/0x4a0 kernel/bpf/cgroup.c:984 link_create kernel/bpf/syscall.c:4320 [inline] __sys_bpf+0x996e/0x123e0 kernel/bpf/syscall.c:4733 __do_sys_bpf kernel/bpf/syscall.c:4767 [inline] __se_sys_bpf kernel/bpf/syscall.c:4765 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4765 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+0x44/0xae Freed by task 411: 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+0x140/0x180 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:1728 [inline] slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kfree+0xc0/0x2a0 mm/slub.c:4552 bpf_cgroup_link_dealloc+0x15/0x20 kernel/bpf/cgroup.c:915 bpf_link_free kernel/bpf/syscall.c:2473 [inline] bpf_link_put+0x243/0x270 kernel/bpf/syscall.c:2495 bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2504 __fput+0x3ee/0x890 fs/file_table.c:317 ____fput+0x15/0x20 fs/file_table.c:350 task_work_run+0x147/0x1b0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0xe0/0xf0 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+0x3e/0x50 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff8881089f8c80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 24 bytes inside of 96-byte region [ffff8881089f8c80, ffff8881089f8ce0) The buggy address belongs to the physical page: page:ffffea0004227e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1089f8 flags: 0x8000000000000200(slab|zone=2) raw: 8000000000000200 ffffea0004223c80 dead000000000006 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 1149046317, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x161/0x170 mm/page_alloc.c:2434 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0x3a7/0xae0 mm/page_alloc.c:4182 __alloc_pages+0x3bd/0x830 mm/page_alloc.c:5408 allocate_slab+0x67/0x320 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x1d2/0x4a0 mm/slub.c:3005 __slab_alloc mm/slub.c:3092 [inline] slab_alloc_node mm/slub.c:3183 [inline] slab_alloc mm/slub.c:3225 [inline] kmem_cache_alloc_trace+0x289/0x3a0 mm/slub.c:3256 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] locate_module_kobject+0x74/0x168 kernel/params.c:771 version_sysfs_builtin+0x64/0xd0 kernel/params.c:874 param_sysfs_init+0x67/0x71 kernel/params.c:969 do_one_initcall+0x1c3/0x5d0 init/main.c:1298 do_initcall_level+0x182/0x2dd init/main.c:1371 do_initcalls+0x50/0x94 init/main.c:1387 do_basic_setup+0x73/0x7a init/main.c:1406 kernel_init_freeable+0x2bd/0x3f6 init/main.c:1613 kernel_init+0x1d/0x2b0 init/main.c:1502 ret_from_fork+0x1f/0x30 page_owner free stack trace missing Memory state around the buggy address: ffff8881089f8b80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff8881089f8c00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff8881089f8c80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8881089f8d00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8881089f8d80: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ==================================================================