linux-kernel - WARNING in hashtab

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Message-ID: <ae7e78f8-e2ed-4406-b9ee-87ff255bae63.bugreport@valiantsec.com>
Date: Mon, 29 Jul 2024 10:49:24 +0800
From: "Ubisectech Sirius" <bugreport@...iantsec.com>
To: "linux-kernel" <linux-kernel@...r.kernel.org>
Cc: "paul" <paul@...l-moore.com>,
  "jmorris" <jmorris@...ei.org>,
  "serge" <serge@...lyn.com>
Subject: WARNING in hashtab_init


Hello.
We are Ubisectech Sirius Team, the vulnerability lab of China ValiantSec. Recently, our team has discovered a issue in Linux kernel 6.8. Attached to the email were a PoC file of the issue.

Stack dump:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 10493 at mm/page_alloc.c:4545 __alloc_pages+0x402/0x21b0 mm/page_alloc.c:4545
Modules linked in:
CPU: 0 PID: 10493 Comm: syz.3.141 Not tainted 6.8.0 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:__alloc_pages+0x402/0x21b0 mm/page_alloc.c:4545
Code: ff 00 0f 84 15 fe ff ff 80 ce 01 e9 0d fe ff ff 83 fe 0a 0f 86 0e fd ff ff 80 3d c7 cf 6a 0d 00 75 0b c6 05 be cf 6a 0d 01 90 <0f> 0b 90 45 31 e4 e9 87 fe ff ff e8 5e 3e 9b ff 84 c0 0f 85 7a fe
RSP: 0018:ffffc90001b37428 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff92000366e98
RDX: 0000000000000000 RSI: 0000000000000016 RDI: 0000000000040dc0
RBP: ffffc90001b376d8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 656c6c616b7a7973 R12: 0000000400000000
R13: 0000000000000016 R14: 0000000000040dc0 R15: 0000000000000016
FS:  00007f10c4184640(0000) GS:ffff88802c600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f10c4163658 CR3: 000000001bb8e000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 <TASK>
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 __kmalloc_large_node+0x88/0x1a0 mm/slub.c:3926
 __do_kmalloc_node mm/slub.c:3969 [inline]
 __kmalloc+0x370/0x480 mm/slub.c:3994
 kmalloc_array include/linux/slab.h:627 [inline]
 kcalloc include/linux/slab.h:658 [inline]
 hashtab_init+0x10a/0x270 security/selinux/ss/hashtab.c:42
 class_read+0x1e4/0xa10 security/selinux/ss/policydb.c:1331
 policydb_read+0x9b6/0x3850 security/selinux/ss/policydb.c:2565
 security_load_policy+0x15d/0x12b0 security/selinux/ss/services.c:2269
 sel_write_load+0x313/0x1b60 security/selinux/selinuxfs.c:600
 vfs_write+0x2b2/0x1090 fs/read_write.c:588
 ksys_write+0x122/0x250 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f10c33958cd
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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:00007f10c4183fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f10c3534038 RCX: 00007f10c33958cd
RDX: 0000000000002000 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 00007f10c341bb06 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f10c3534038 R15: 00007f10c4164000
 </TASK>

Thank you for taking the time to read this email and we look forward to working with you further.

Download attachment "poc.c" of type "application/octet-stream" (9868 bytes)