Incorrect mapping of Executable bits in Fuchsia Kernel

An incorrect setting of UXN bits within mmu_flags_to_s1_pte_attr lead to privileged executable pages being mapped as executable from an unprivileged context. This can be leveraged by an attacker to bypass executability restrictions of kernel-mode pages from user-mode. An incorrect setting of PXN bits within mmu_flags_to_s1_pte_attr lead to unprivileged executable pages being mapped as executable from a privileged context. This can be leveraged by an attacker to bypass executability restrictions of user-mode pages from kernel-mode. Typically this allows a potential attacker to circumvent a mitigation, making exploitation of potential kernel-mode vulnerabilities easier. We recommend updating kernel beyond commit 7d731b4e9599088ac3073956933559da7bca6a00 and rebuilding.

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Permission Issues

Fuchsia 授权问题漏洞

Fuchsia是一个开源的通用操作系统。 fuchsia 存在安全漏洞，攻击者可以利用该漏洞从用户模式绕过内核模式页面的可执行性限制。

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