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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3810:b0:3dc:90fc:282d with SMTP id e9e14a558f8ab-3dd9cbd3f78mr88607875ab.16.1748820662577; Sun, 01 Jun 2025 16:31:02 -0700 (PDT) Date: Sun, 01 Jun 2025 16:31:02 -0700 In-Reply-To: <20250601231608.2638-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <683ce2b6.a00a0220.d8eae.0038.GAE@google.com> Subject: Re: [syzbot] [kernel?] KASAN: slab-out-of-bounds Read in __futex_pivot_hash From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: slab-out-of-bounds Read in __futex_pivot_hash ================================================================== BUG: KASAN: slab-out-of-bounds in __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] BUG: KASAN: slab-out-of-bounds in _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 Read of size 1 at addr ffff888052d074e0 by task syz.0.16/6505 CPU: 1 UID: 0 PID: 6505 Comm: syz.0.16 Not tainted 6.15.0-syzkaller-gcd2e103d57e5-dirty #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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:408 [inline] print_report+0xcd/0x680 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 __kasan_check_byte+0x36/0x50 mm/kasan/common.c:557 kasan_check_byte include/linux/kasan.h:399 [inline] lock_acquire kernel/locking/lockdep.c:5845 [inline] lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5828 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] futex_rehash_private kernel/futex/core.c:213 [inline] __futex_pivot_hash+0x225/0x6d0 kernel/futex/core.c:252 futex_hash_allocate+0xad1/0xf00 kernel/futex/core.c:1664 futex_hash_prctl+0x1f4/0x650 kernel/futex/core.c:1759 __do_sys_prctl+0x171f/0x24c0 kernel/sys.c:2825 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7e8738e969 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:00007f7e882e3038 EFLAGS: 00000246 ORIG_RAX: 000000000000009d RAX: ffffffffffffffda RBX: 00007f7e875b5fa0 RCX: 00007f7e8738e969 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000004e RBP: 00007f7e87410ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f7e875b5fa0 R15: 00007fff0b994368 Allocated by task 6506: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kvmalloc_node_noprof+0x279/0x620 mm/slub.c:5012 futex_hash_allocate+0x49d/0xf00 kernel/futex/core.c:1603 futex_hash_prctl+0x1f4/0x650 kernel/futex/core.c:1759 __do_sys_prctl+0x171f/0x24c0 kernel/sys.c:2825 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888052d07480 which belongs to the cache kmalloc-cg-64 of size 64 The buggy address is located 32 bytes to the right of allocated 64-byte region [ffff888052d07480, ffff888052d074c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888052d07800 pfn:0x52d07 memcg:ffff888029437c01 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b849a40 dead000000000122 0000000000000000 raw: ffff888052d07800 000000008020001e 00000000f5000000 ffff888029437c01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6405, tgid 6405 (syz-executor), ts 88336803313, free_ts 88336042403 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2450 [inline] allocate_slab mm/slub.c:2618 [inline] new_slab+0x23b/0x330 mm/slub.c:2672 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3858 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948 __slab_alloc_node mm/slub.c:4023 [inline] slab_alloc_node mm/slub.c:4184 [inline] __do_kmalloc_node mm/slub.c:4326 [inline] __kvmalloc_node_noprof+0x3af/0x620 mm/slub.c:5012 allocate_hook_entries_size net/netfilter/core.c:58 [inline] nf_hook_entries_grow+0x22b/0x860 net/netfilter/core.c:137 __nf_register_net_hook+0x1cd/0x730 net/netfilter/core.c:432 nf_register_net_hook+0x109/0x160 net/netfilter/core.c:575 nf_register_net_hooks+0x5d/0xd0 net/netfilter/core.c:591 arpt_register_table+0x29b/0x410 net/ipv4/netfilter/arp_tables.c:1561 arptable_filter_table_init+0x40/0x60 net/ipv4/netfilter/arptable_filter.c:39 xt_find_table_lock+0x2e1/0x520 net/netfilter/x_tables.c:1260 xt_request_find_table_lock+0x28/0xf0 net/netfilter/x_tables.c:1285 page last free pid 6405 tgid 6405 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706 ___free_pages_bulk mm/kasan/shadow.c:332 [inline] __kasan_populate_vmalloc mm/kasan/shadow.c:375 [inline] kasan_populate_vmalloc+0x18c/0x1f0 mm/kasan/shadow.c:417 alloc_vmap_area+0x959/0x29c0 mm/vmalloc.c:2084 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3179 __vmalloc_node_range_noprof+0x271/0x14b0 mm/vmalloc.c:3845 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:3948 ebt_register_table+0x243/0xfc0 net/bridge/netfilter/ebtables.c:1211 find_inlist_lock_noload net/bridge/netfilter/ebtables.c:343 [inline] find_inlist_lock.constprop.0+0x1d0/0x730 net/bridge/netfilter/ebtables.c:370 find_table_lock net/bridge/netfilter/ebtables.c:379 [inline] do_ebt_get_ctl+0x225/0x7c0 net/bridge/netfilter/ebtables.c:2468 nf_getsockopt+0x7c/0xe0 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x18c/0x1e0 net/ipv4/ip_sockglue.c:1777 tcp_getsockopt+0x9e/0x100 net/ipv4/tcp.c:4760 do_sock_getsockopt+0x3fc/0x800 net/socket.c:2357 __sys_getsockopt+0x12f/0x260 net/socket.c:2386 __do_sys_getsockopt net/socket.c:2393 [inline] __se_sys_getsockopt net/socket.c:2390 [inline] __x64_sys_getsockopt+0xbd/0x160 net/socket.c:2390 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 Memory state around the buggy address: ffff888052d07380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888052d07400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888052d07480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888052d07500: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff888052d07580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== Tested on: commit: cd2e103d Merge tag 'hardening-v6.16-rc1-fix1-take2' of.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=168ccc82580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4df26174733e11f3 dashboard link: https://syzkaller.appspot.com/bug?extid=0a5079ee014f4b907817 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=1172a80c580000