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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a2e:b0:3a7:6f5a:e5c7 with SMTP id e9e14a558f8ab-3a76f5ae756mr17759695ab.4.1731947244875; Mon, 18 Nov 2024 08:27:24 -0800 (PST) Date: Mon, 18 Nov 2024 08:27:24 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <673b6aec.050a0220.87769.004a.GAE@google.com> Subject: [syzbot] [keyrings?] [lsm?] KASAN: slab-use-after-free Read in key_put From: syzbot To: dhowells@redhat.com, jarkko@kernel.org, jmorris@namei.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, paul@paul-moore.com, serge@hallyn.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: adc218676eef Linux 6.12 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=16c672e8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=55f8591b98dd132 dashboard link: https://syzkaller.appspot.com/bug?extid=6105ffc1ded71d194d6d compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12dbbb5f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11c672e8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2362200b664b/disk-adc21867.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/866b8b236466/vmlinux-adc21867.xz kernel image: https://storage.googleapis.com/syzbot-assets/607680582dad/bzImage-adc21867.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6105ffc1ded71d194d6d@syzkaller.appspotmail.com trusted_key: encrypted_key: insufficient parameters specified ================================================================== BUG: KASAN: slab-use-after-free in key_put security/keys/key.c:657 [inline] BUG: KASAN: slab-use-after-free in key_put+0x288/0x2a0 security/keys/key.c:646 Read of size 8 at addr ffff888079173b00 by task syz-executor356/7162 CPU: 0 UID: 0 PID: 7162 Comm: syz-executor356 Not tainted 6.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 key_put security/keys/key.c:657 [inline] key_put+0x288/0x2a0 security/keys/key.c:646 __key_create_or_update+0x92b/0xe10 security/keys/key.c:940 key_create_or_update+0x42/0x60 security/keys/key.c:1018 __do_sys_add_key+0x29c/0x460 security/keys/keyctl.c:134 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f410659a399 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4106552218 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007f4106621328 RCX: 00007f410659a399 RDX: 0000000020000100 RSI: 0000000020000180 RDI: 0000000020000140 RBP: 00007f4106621320 R08: 00000000fffffffe R09: 0000000000000000 R10: 00000000000000ca R11: 0000000000000246 R12: 00007f41065ee074 R13: 0072736d2f232f75 R14: 7570632f7665642f R15: 6574707972636e65 Allocated by task 7162: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4141 key_alloc+0x3e3/0x13a0 security/keys/key.c:277 __key_create_or_update+0x71f/0xe10 security/keys/key.c:930 key_create_or_update+0x42/0x60 security/keys/key.c:1018 __do_sys_add_key+0x29c/0x460 security/keys/keyctl.c:134 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 46: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kmem_cache_free+0x152/0x4b0 mm/slub.c:4681 key_gc_unused_keys.constprop.0+0x134/0x480 security/keys/gc.c:167 key_garbage_collector+0x432/0x990 security/keys/gc.c:300 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 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 ffff888079173a40 which belongs to the cache key_jar of size 336 The buggy address is located 192 bytes inside of freed 336-byte region [ffff888079173a40, ffff888079173b90) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79172 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 ffff88801c2ba140 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080120012 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801c2ba140 dead000000000122 0000000000000000 head: 0000000000000000 0000000080120012 00000001f5000000 0000000000000000 head: 00fff00000000001 ffffea0001e45c81 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 7134, tgid 7131 (syz-executor356), ts 90591707414, free_ts 84975549277 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2412 [inline] allocate_slab mm/slub.c:2578 [inline] new_slab+0x2c9/0x410 mm/slub.c:2631 ___slab_alloc+0xdac/0x1880 mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] kmem_cache_alloc_noprof+0x2a7/0x2f0 mm/slub.c:4141 key_alloc+0x3e3/0x13a0 security/keys/key.c:277 keyring_alloc+0x44/0xc0 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+0xa34/0x12f0 security/keys/process_keys.c:653 __do_sys_add_key+0x25a/0x460 security/keys/keyctl.c:126 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 6961 tgid 6958 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2657 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] __kmalloc_cache_node_noprof+0x173/0x350 mm/slub.c:4303 kmalloc_node_noprof include/linux/slab.h:901 [inline] alloc_user_cpus_ptr kernel/sched/sched.h:2614 [inline] sched_setaffinity+0x252/0x430 kernel/sched/syscalls.c:1282 __do_sys_sched_setaffinity kernel/sched/syscalls.c:1331 [inline] __se_sys_sched_setaffinity kernel/sched/syscalls.c:1320 [inline] __x64_sys_sched_setaffinity+0x101/0x170 kernel/sched/syscalls.c:1320 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888079173a00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff888079173a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888079173b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888079173b80: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888079173c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. 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