Vulnerability Information
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Vulnerability Title
powerpc/pseries: Fix scv instruction crash with kexec
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries: Fix scv instruction crash with kexec kexec on pseries disables AIL (reloc_on_exc), required for scv instruction support, before other CPUs have been shut down. This means they can execute scv instructions after AIL is disabled, which causes an interrupt at an unexpected entry location that crashes the kernel. Change the kexec sequence to disable AIL after other CPUs have been brought down. As a refresher, the real-mode scv interrupt vector is 0x17000, and the fixed-location head code probably couldn't easily deal with implementing such high addresses so it was just decided not to support that interrupt at all.
CVSS Information
N/A
Vulnerability Type
N/A
Vulnerability Title
Linux kernel 安全漏洞
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于powerpc/pseries模块中在使用kexec时，pseries平台在其他CPU关闭之前禁用了AIL，这可能导致在禁用AIL后执行scv指令的CPU中断，从而在意外的位置触发中断并导致内核崩溃。
CVSS Information
N/A
Vulnerability Type
N/A