Commit 816ef8d7 authored by Borislav Petkov's avatar Borislav Petkov

x86/efi: Remove EFI PGD build time checks

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: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Reviewed-by: default avatarNathan Chancellor <nathan@kernel.org>
Acked-by: default avatarArd Biesheuvel <ardb@kernel.org>
Tested-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Tested-by: default avatarNathan Chancellor <nathan@kernel.org>
Link: http://lkml.kernel.org/r/20210107223424.4135538-1-arnd@kernel.org
parent 3943abf2
...@@ -115,31 +115,12 @@ void efi_sync_low_kernel_mappings(void) ...@@ -115,31 +115,12 @@ void efi_sync_low_kernel_mappings(void)
pud_t *pud_k, *pud_efi; pud_t *pud_k, *pud_efi;
pgd_t *efi_pgd = efi_mm.pgd; 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_efi = efi_pgd + pgd_index(PAGE_OFFSET);
pgd_k = pgd_offset_k(PAGE_OFFSET); pgd_k = pgd_offset_k(PAGE_OFFSET);
num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET); num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET);
memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries); 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_efi = efi_pgd + pgd_index(EFI_VA_END);
pgd_k = pgd_offset_k(EFI_VA_END); pgd_k = pgd_offset_k(EFI_VA_END);
p4d_efi = p4d_offset(pgd_efi, 0); p4d_efi = p4d_offset(pgd_efi, 0);
......
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