Vulnerability Information
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Vulnerability Title
N/A
Vulnerability Description
On Linux running on PowerPC hardware (Power8 or later) a user process can craft a signal frame and then do a sigreturn so that the kernel will take an exception (interrupt), and use the r1 value *from the signal frame* as the kernel stack pointer. As part of the exception entry the content of the signal frame is written to the kernel stack, allowing an attacker to overwrite arbitrary locations with arbitrary values. The exception handling does produce an oops, and a panic if panic_on_oops=1, but only after kernel memory has been over written. This flaw was introduced in commit: "5d176f751ee3 (powerpc: tm: Enable transactional memory (TM) lazily for userspace)" which was merged upstream into v4.9-rc1. Please note that kernels built with CONFIG_PPC_TRANSACTIONAL_MEM=n are not vulnerable.
CVSS Information
N/A
Vulnerability Type
N/A
Vulnerability Title
Power8 Linux kernel 安全漏洞
Vulnerability Description
Linux kernel on Power8是美国Linux基金会发布的运行在Power8（一种精简指令集架构的CPU）中的操作系统Linux所使用的内核。 Power8及之后的版本中的PowerPC固件的Linux kernel的signal frame的处理存在安全漏洞。本地攻击者可借助任意值利用该漏洞覆盖任意位置或造成拒绝服务。
CVSS Information
N/A
Vulnerability Type
N/A