中危 parisc：清除指令访问权限陷阱上的陈旧 IIR 值 (CVE-2021-46928)

CVE编号

CVE-2021-46928

利用情况

暂无

补丁情况

官方补丁

披露时间

2024-02-27
漏洞描述
In the Linux kernel, the following vulnerability has been resolved:

parisc: Clear stale IIR value on instruction access rights trap

When a trap 7 (Instruction access rights) occurs, this means the CPU
couldn't execute an instruction due to missing execute permissions on
the memory region. In this case it seems the CPU didn't even fetched
the instruction from memory and thus did not store it in the cr19 (IIR)
register before calling the trap handler. So, the trap handler will find
some random old stale value in cr19.

This patch simply overwrites the stale IIR value with a constant magic
"bad food" value (0xbaadf00d), in the hope people don't start to try to
understand the various random IIR values in trap 7 dumps.
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/484730e5862f6b872dca13840bed40fd7c60fa26
https://git.kernel.org/stable/c/d01e9ce1af6116f812491d3d3873d204f10ae0b8
https://git.kernel.org/stable/c/e96373f0a5f484bc1e193f9951dcb3adf24bf3f7
受影响软件情况
# 类型 厂商 产品 版本 影响面
1
运行在以下环境
系统 debian_11 linux * Up to
(excluding)
5.10.92-1
运行在以下环境
系统 debian_12 linux * Up to
(excluding)
5.15.15-1
运行在以下环境
系统 linux linux_kernel * Up to
(excluding)
5.10.90
运行在以下环境
系统 linux linux_kernel * From
(including)
5.11.0 		Up to
(excluding)
5.15.13
阿里云评分
5.0
  • 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-755 对异常条件的处理不恰当
阿里云安全产品覆盖情况