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Commitcab15ce604("arm64: Introduce execute-only page access permissions") allowed a valid user PTE to have the PTE_USER bit clear. As a consequence, the pte_valid_not_user() macro in set_pte() was replaced with pte_valid_global() under the assumption that only user pages have the nG bit set. EFI mappings, however, also have the nG bit set and set_pte() wrongly ignores issuing the DSB+ISB. This patch reinstates the pte_valid_not_user() macro and adds the PTE_UXN bit check since all kernel mappings have this bit set. For clarity, pte_exec() is renamed to pte_user_exec() as it only checks for the absence of PTE_UXN. Consequently, the user executable check in set_pte_at() drops the pte_ng() test since pte_user_exec() is sufficient. Fixes:cab15ce604("arm64: Introduce execute-only page access permissions") Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.