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BUG: KASAN: slab-use-after-free in key_put+0xea/0x230 security/keys/key.c:656
Read of size 8 at addr ffff8880282707c0 by task syz.0.482/8927

CPU: 1 UID: 0 PID: 8927 Comm: syz.0.482 Not tainted 6.12.0-rc1-next-20241001-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 key_put+0xea/0x230 security/keys/key.c:656
 __key_create_or_update+0xaf4/0xc70 security/keys/key.c:940
 key_create_or_update+0x42/0x60 security/keys/key.c:1018
 __do_sys_add_key security/keys/keyctl.c:134 [inline]
 __se_sys_add_key+0x33f/0x490 security/keys/keyctl.c:74
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe03277dff9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe03356e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00007fe032935f80 RCX: 00007fe03277dff9
RDX: 0000000020000100 RSI: 0000000020000180 RDI: 0000000020000140
RBP: 00007fe0327f0296 R08: fffffffffffffffe R09: 0000000000000000
R10: 00000000000000ca R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe032935f80 R15: 00007ffd8acb3418
 </TASK>

Allocated by task 8927:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4086 [inline]
 slab_alloc_node mm/slub.c:4135 [inline]
 kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4142
 key_alloc+0x341/0xff0 security/keys/key.c:277
 __key_create_or_update+0xa55/0xc70 security/keys/key.c:930
 key_create_or_update+0x42/0x60 security/keys/key.c:1018
 __do_sys_add_key security/keys/keyctl.c:134 [inline]
 __se_sys_add_key+0x33f/0x490 security/keys/keyctl.c:74
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 8:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2343 [inline]
 slab_free mm/slub.c:4580 [inline]
 kmem_cache_free+0x1a2/0x420 mm/slub.c:4682
 key_gc_unused_keys+0x389/0x400 security/keys/gc.c:167
 key_garbage_collector+0x8b5/0xa00 security/keys/gc.c:300
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

The buggy address belongs to the object at ffff888028270700
 which belongs to the cache key_jar of size 336
The buggy address is located 192 bytes inside of
 freed 336-byte region [ffff888028270700, ffff888028270850)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880282708c0 pfn:0x28270
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801be88140 dead000000000122 0000000000000000
raw: ffff8880282708c0 0000000080120011 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801be88140 dead000000000122 0000000000000000
head: ffff8880282708c0 0000000080120011 00000001f5000000 0000000000000000
head: 00fff00000000001 ffffea0000a09c01 ffffffffffffffff 0000000000000000
head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8288, tgid 8282 (syz.3.397), ts 477513153137, free_ts 476083959872
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0x3129/0x3270 mm/page_alloc.c:3493
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4769
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x120 mm/slub.c:2413
 allocate_slab+0x5a/0x2f0 mm/slub.c:2579
 new_slab mm/slub.c:2632 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3819
 __slab_alloc+0x58/0xa0 mm/slub.c:3909
 __slab_alloc_node mm/slub.c:3962 [inline]
 slab_alloc_node mm/slub.c:4123 [inline]
 kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4142
 key_alloc+0x341/0xff0 security/keys/key.c:277
 keyring_alloc+0x44/0xb0 security/keys/keyring.c:526
 install_process_keyring_to_cred security/keys/process_keys.c:275 [inline]
 install_process_keyring security/keys/process_keys.c:300 [inline]
 lookup_user_key+0x54d/0x1500 security/keys/process_keys.c:653
 __do_sys_add_key security/keys/keyctl.c:126 [inline]
 __se_sys_add_key+0x2fa/0x490 security/keys/keyctl.c:74
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 8277 tgid 8277 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2674
 mm_free_pgd kernel/fork.c:802 [inline]
 __mmdrop+0xb9/0x3d0 kernel/fork.c:918
 exec_mmap+0x680/0x710 fs/exec.c:1014
 begin_new_exec+0x12c0/0x2050 fs/exec.c:1280
 load_elf_binary+0x966/0x2710 fs/binfmt_elf.c:996
 search_binary_handler fs/exec.c:1752 [inline]
 exec_binprm fs/exec.c:1794 [inline]
 bprm_execve+0xaf8/0x1770 fs/exec.c:1845
 do_execveat_common+0x55f/0x6f0 fs/exec.c:1952
 do_execve fs/exec.c:2026 [inline]
 __do_sys_execve fs/exec.c:2102 [inline]
 __se_sys_execve fs/exec.c:2097 [inline]
 __x64_sys_execve+0x92/0xb0 fs/exec.c:2097
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888028270680: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888028270700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888028270780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff888028270800: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
 ffff888028270880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
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