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    efi/libstub: Allocate headspace in efi_get_memory_map() · dadb57ab
    Jeffrey Hugo 提交于
    efi_get_memory_map() allocates a buffer to store the memory map that it
    retrieves.  This buffer may need to be reused by the client after
    ExitBootServices() is called, at which point allocations are not longer
    permitted.  To support this usecase, provide the allocated buffer size back
    to the client, and allocate some additional headroom to account for any
    reasonable growth in the map that is likely to happen between the call to
    efi_get_memory_map() and the client reusing the buffer.
    Signed-off-by: NJeffrey Hugo <jhugo@codeaurora.org>
    Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Leif Lindholm <leif.lindholm@linaro.org>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: <stable@vger.kernel.org>
    Signed-off-by: NMatt Fleming <matt@codeblueprint.co.uk>
    dadb57ab
eboot.c 29.6 KB