阿里云漏洞库

漏洞描述

In the Linux kernel, the following vulnerability has been resolved:

tpm: efi: Use local variable for calculating final log size

When tpm_read_log_efi is called multiple times, which happens when

one loads and unloads a TPM2 driver multiple times, then the global

variable efi_tpm_final_log_size will at some point become a negative

number due to the subtraction of final_events_preboot_size occurring

each time. Use a local variable to avoid this integer underflow.

The following issue is now resolved:

Mar 8 15:35:12 hibinst kernel: Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015

Mar 8 15:35:12 hibinst kernel: Workqueue: tpm-vtpm vtpm_proxy_work [tpm_vtpm_proxy]

Mar 8 15:35:12 hibinst kernel: RIP: 0010:__memcpy+0x12/0x20

Mar 8 15:35:12 hibinst kernel: Code: 00 b8 01 00 00 00 85 d2 74 0a c7 05 44 7b ef 00 0f 00 00 00 c3 cc cc cc 66 66 90 66 90 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 f3 a4

Mar 8 15:35:12 hibinst kernel: RSP: 0018:ffff9ac4c0fcfde0 EFLAGS: 00010206

Mar 8 15:35:12 hibinst kernel: RAX: ffff88f878cefed5 RBX: ffff88f878ce9000 RCX: 1ffffffffffffe0f

Mar 8 15:35:12 hibinst kernel: RDX: 0000000000000003 RSI: ffff9ac4c003bff9 RDI: ffff88f878cf0e4d

Mar 8 15:35:12 hibinst kernel: RBP: ffff9ac4c003b000 R08: 0000000000001000 R09: 000000007e9d6073

Mar 8 15:35:12 hibinst kernel: R10: ffff9ac4c003b000 R11: ffff88f879ad3500 R12: 0000000000000ed5

Mar 8 15:35:12 hibinst kernel: R13: ffff88f878ce9760 R14: 0000000000000002 R15: ffff88f77de7f018

Mar 8 15:35:12 hibinst kernel: FS: 0000000000000000(0000) GS:ffff88f87bd00000(0000) knlGS:0000000000000000

Mar 8 15:35:12 hibinst kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

Mar 8 15:35:12 hibinst kernel: CR2: ffff9ac4c003c000 CR3: 00000001785a6004 CR4: 0000000000060ee0

Mar 8 15:35:12 hibinst kernel: Call Trace:

Mar 8 15:35:12 hibinst kernel: tpm_read_log_efi+0x152/0x1a7

Mar 8 15:35:12 hibinst kernel: tpm_bios_log_setup+0xc8/0x1c0

Mar 8 15:35:12 hibinst kernel: tpm_chip_register+0x8f/0x260

Mar 8 15:35:12 hibinst kernel: vtpm_proxy_work+0x16/0x60 [tpm_vtpm_proxy]

Mar 8 15:35:12 hibinst kernel: process_one_work+0x1b4/0x370

Mar 8 15:35:12 hibinst kernel: worker_thread+0x53/0x3e0

Mar 8 15:35:12 hibinst kernel: ? process_one_work+0x370/0x370

解决建议

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考链接
https://git.kernel.org/stable/c/2f12258b5224cfaa808c54fd29345f3c1cbfca76
https://git.kernel.org/stable/c/3818b753277f5ca0c170bf5b98e0a5a225542fcb
https://git.kernel.org/stable/c/48cff270b037022e37835d93361646205ca25101
https://git.kernel.org/stable/c/60a01ecc9f68067e4314a0b55148e39e5d58a51b
https://git.kernel.org/stable/c/ac07c557ca12ec9276c0375517bac7ae5be4e50c

受影响软件情况

1
#	类型	厂商	产品	版本	影响面
	运行在以下环境
	系统	debian_10	linux	*		Up to (excluding) 4.19.304-1
	运行在以下环境
	系统	debian_11	linux	*		Up to (excluding) 5.10.38-1
	运行在以下环境
	系统	debian_12	linux	*		Up to (excluding) 5.10.38-1
	运行在以下环境
	系统	linux	linux_kernel	*	From (including) 5.11.0	Up to (excluding) 5.11.20
	运行在以下环境
	系统	linux	linux_kernel	*	From (including) 5.12.0	Up to (excluding) 5.12.3
	运行在以下环境
	系统	linux	linux_kernel	*	From (including) 5.3.0	Up to (excluding) 5.4.118
	运行在以下环境
	系统	linux	linux_kernel	*	From (including) 5.5.0	Up to (excluding) 5.10.36

攻击路径

本地
攻击复杂度

困难
权限要求

管控权限
影响范围

有限影响
EXP成熟度

未验证
补丁情况

官方补丁
数据保密性

无影响
数据完整性

无影响
服务器危害

无影响
全网数量

N/A

CWE-ID	漏洞类型
CWE-191	整数下溢（超界折返）

中危 tpm：efi：使用局部变量计算最终日志大小 (CVE-2021-46951)

漏洞描述

解决建议

参考链接

受影响软件情况