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    Subject[PATCH AUTOSEL 5.10 36/36] x86/efi: Remove EFI PGD build time checks
    Date
    From: Borislav Petkov <bp@suse.de>

    [ Upstream commit 816ef8d7a2c4182e19bc06ab65751cb9e3951e94 ]

    With CONFIG_X86_5LEVEL, CONFIG_UBSAN and CONFIG_UBSAN_UNSIGNED_OVERFLOW
    enabled, clang fails the build with

    x86_64-linux-ld: arch/x86/platform/efi/efi_64.o: in function `efi_sync_low_kernel_mappings':
    efi_64.c:(.text+0x22c): undefined reference to `__compiletime_assert_354'

    which happens due to -fsanitize=unsigned-integer-overflow being enabled:

    -fsanitize=unsigned-integer-overflow: Unsigned integer overflow, where
    the result of an unsigned integer computation cannot be represented
    in its type. Unlike signed integer overflow, this is not undefined
    behavior, but it is often unintentional. This sanitizer does not check
    for lossy implicit conversions performed before such a computation
    (see -fsanitize=implicit-conversion).

    and that fires when the (intentional) EFI_VA_START/END defines overflow
    an unsigned long, leading to the assertion expressions not getting
    optimized away (on GCC they do)...

    However, those checks are superfluous: the runtime services mapping
    code already makes sure the ranges don't overshoot EFI_VA_END as the
    EFI mapping range is hardcoded. On each runtime services call, it is
    switched to the EFI-specific PGD and even if mappings manage to escape
    that last PGD, this won't remain unnoticed for long.

    So rip them out.

    See https://github.com/ClangBuiltLinux/linux/issues/256 for more info.

    Reported-by: Arnd Bergmann <arnd@arndb.de>
    Signed-off-by: Borislav Petkov <bp@suse.de>
    Reviewed-by: Nathan Chancellor <nathan@kernel.org>
    Acked-by: Ard Biesheuvel <ardb@kernel.org>
    Tested-by: Nick Desaulniers <ndesaulniers@google.com>
    Tested-by: Nathan Chancellor <nathan@kernel.org>
    Link: http://lkml.kernel.org/r/20210107223424.4135538-1-arnd@kernel.org
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/x86/platform/efi/efi_64.c | 19 -------------------
    1 file changed, 19 deletions(-)

    diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
    index e1e8d4e3a2139..8efd003540cae 100644
    --- a/arch/x86/platform/efi/efi_64.c
    +++ b/arch/x86/platform/efi/efi_64.c
    @@ -115,31 +115,12 @@ void efi_sync_low_kernel_mappings(void)
    pud_t *pud_k, *pud_efi;
    pgd_t *efi_pgd = efi_mm.pgd;

    - /*
    - * We can share all PGD entries apart from the one entry that
    - * covers the EFI runtime mapping space.
    - *
    - * Make sure the EFI runtime region mappings are guaranteed to
    - * only span a single PGD entry and that the entry also maps
    - * other important kernel regions.
    - */
    - MAYBE_BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END));
    - MAYBE_BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) !=
    - (EFI_VA_END & PGDIR_MASK));
    -
    pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET);
    pgd_k = pgd_offset_k(PAGE_OFFSET);

    num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET);
    memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries);

    - /*
    - * As with PGDs, we share all P4D entries apart from the one entry
    - * that covers the EFI runtime mapping space.
    - */
    - BUILD_BUG_ON(p4d_index(EFI_VA_END) != p4d_index(MODULES_END));
    - BUILD_BUG_ON((EFI_VA_START & P4D_MASK) != (EFI_VA_END & P4D_MASK));
    -
    pgd_efi = efi_pgd + pgd_index(EFI_VA_END);
    pgd_k = pgd_offset_k(EFI_VA_END);
    p4d_efi = p4d_offset(pgd_efi, 0);
    --
    2.27.0
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