[0/6] ubsan: Introduce wrap-around sanitizers

Message

Kees Cook Jan. 29, 2024, 6 p.m. UTC

Hi,

Lay the ground work for gaining instrumentation for signed[1],
unsigned[2], and pointer[3] wrap-around by making all 3 sanitizers
available for testing. Additionally gets x86_64 bootable under the
unsigned sanitizer for the first time.

The compilers will need work before this can be generally useful, as the
signed and pointer sanitizers are effectively a no-op with the kernel's
required use of -fno-strict-overflow. The unsigned sanitizer will also
need adjustment to deal with the many common code patterns that exist
for unsigned wrap-around (e.g. "while (var--)", "-1UL", etc).

-Kees

Link: https://github.com/KSPP/linux/issues/26 [1]
Link: https://github.com/KSPP/linux/issues/27 [2]
Link: https://github.com/KSPP/linux/issues/344 [3]

Kees Cook (6):
  ubsan: Use Clang's -fsanitize-trap=undefined option
  ubsan: Reintroduce signed and unsigned overflow sanitizers
  ubsan: Introduce CONFIG_UBSAN_POINTER_WRAP
  ubsan: Remove CONFIG_UBSAN_SANITIZE_ALL
  ubsan: Split wrapping sanitizer Makefile rules
  ubsan: Get x86_64 booting with unsigned wrap-around sanitizer

 Documentation/dev-tools/ubsan.rst | 28 +++-------
 arch/arm/Kconfig                  |  2 +-
 arch/arm64/Kconfig                |  2 +-
 arch/mips/Kconfig                 |  2 +-
 arch/parisc/Kconfig               |  2 +-
 arch/powerpc/Kconfig              |  2 +-
 arch/riscv/Kconfig                |  2 +-
 arch/s390/Kconfig                 |  2 +-
 arch/x86/Kconfig                  |  2 +-
 arch/x86/kernel/Makefile          |  1 +
 arch/x86/kernel/apic/Makefile     |  1 +
 arch/x86/mm/Makefile              |  1 +
 arch/x86/mm/pat/Makefile          |  1 +
 crypto/Makefile                   |  1 +
 drivers/acpi/Makefile             |  1 +
 include/linux/compiler_types.h    | 19 ++++++-
 kernel/Makefile                   |  1 +
 kernel/locking/Makefile           |  1 +
 kernel/rcu/Makefile               |  1 +
 kernel/sched/Makefile             |  1 +
 lib/Kconfig.ubsan                 | 41 +++++++++-----
 lib/Makefile                      |  1 +
 lib/crypto/Makefile               |  1 +
 lib/crypto/mpi/Makefile           |  1 +
 lib/test_ubsan.c                  | 82 ++++++++++++++++++++++++++++
 lib/ubsan.c                       | 89 +++++++++++++++++++++++++++++++
 lib/ubsan.h                       |  5 ++
 lib/zlib_deflate/Makefile         |  1 +
 lib/zstd/Makefile                 |  2 +
 mm/Makefile                       |  1 +
 net/core/Makefile                 |  1 +
 net/ipv4/Makefile                 |  1 +
 scripts/Makefile.lib              | 11 +++-
 scripts/Makefile.ubsan            | 11 +++-
 34 files changed, 278 insertions(+), 43 deletions(-)