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ubsan: enable for all*config builds 

With UBSAN_OBJECT_SIZE disabled for GCC, only UBSAN_ALIGNMENT remained a
noisy UBSAN option.  Disable it for COMPILE_TEST so the rest of UBSAN can
be used for full all*config builds or other large combinations.

[sfr@canb.auug.org.au: add .data..Lubsan_data*/.data..Lubsan_type* sections explicitly]
  Link: https://lkml.kernel.org/r/20201208230157.42c42789@canb.auug.org.au

Link: https://lore.kernel.org/lkml/CAHk-=wgXW=YLxGN0QVpp-1w5GDd2pf1W-FqY15poKzoVfik2qA@mail.gmail.com/
Link: https://lkml.kernel.org/r/20201203004437.389959-6-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: George Popescu <georgepope@android.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Marco Elver <elver@google.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Michal Marek <michal.lkml@markovi.net>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kees Cook 2020-12-15 20:46:35 -08:00 committed by Linus Torvalds
parent 79791378a1
commit d0a3ac549f
2 changed files with 5 additions and 2 deletions
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4
arch/powerpc/kernel/vmlinux.lds.S
View File

@ -313,6 +313,10 @@ SECTIONS
#else
.data : AT(ADDR(.data) - LOAD_OFFSET) {
DATA_DATA
#ifdef CONFIG_UBSAN
*(.data..Lubsan_data*)
*(.data..Lubsan_type*)
#endif
*(.data.rel*)
*(.toc1)
*(.branch_lt)

3
lib/Kconfig.ubsan
View File

@ -130,7 +130,6 @@ config UBSAN_ENUM
config UBSAN_SANITIZE_ALL
bool "Enable instrumentation for the entire kernel"
depends on ARCH_HAS_UBSAN_SANITIZE_ALL
depends on !COMPILE_TEST
default y
help
This option activates instrumentation for the entire kernel.
@ -142,7 +141,7 @@ config UBSAN_SANITIZE_ALL
config UBSAN_ALIGNMENT
bool "Enable checks for pointers alignment"
default !HAVE_EFFICIENT_UNALIGNED_ACCESS
depends on !UBSAN_TRAP
depends on !UBSAN_TRAP && !COMPILE_TEST
depends on $(cc-option,-fsanitize=alignment)
help
This option enables the check of unaligned memory accesses.