• Ard Biesheuvel's avatar
    arm64: fix R/O permissions of FDT mapping · fb226c3d
    Ard Biesheuvel authored
    The mapping permissions of the FDT are set to 'PAGE_KERNEL | PTE_RDONLY'
    in an attempt to map the FDT as read-only. However, not only does this
    break at build time under STRICT_MM_TYPECHECKS (since the two terms are
    of different types in that case), it also results in both the PTE_WRITE
    and PTE_RDONLY attributes to be set, which means the region is still
    writable under ARMv8.1 DBM (and an attempted write will simply clear the
    PT_RDONLY bit).
    
    So instead, define PAGE_KERNEL_RO (which already has an established
    meaning across architectures) and use that instead.
    Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
    Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
    fb226c3d
mmu.c 18.7 KB