diff options
| author | Nathan Chancellor <nathan@kernel.org> | 2022-12-15 00:26:03 +0100 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-12-15 01:05:36 +0100 |
| commit | d6a9fb87e9d18f3394a9845546bbe868efdccfd2 (patch) | |
| tree | d5c94c1a1096489916a2f52f9edc06410c258588 | |
| parent | lkdtm: cfi: Make PAC test work with GCC 7 and 8 (diff) | |
| download | linux-d6a9fb87e9d18f3394a9845546bbe868efdccfd2.tar.xz linux-d6a9fb87e9d18f3394a9845546bbe868efdccfd2.zip | |
security: Restrict CONFIG_ZERO_CALL_USED_REGS to gcc or clang > 15.0.6
A bad bug in clang's implementation of -fzero-call-used-regs can result
in NULL pointer dereferences (see the links above the check for more
information). Restrict CONFIG_CC_HAS_ZERO_CALL_USED_REGS to either a
supported GCC version or a clang newer than 15.0.6, which will catch
both a theoretical 15.0.7 and the upcoming 16.0.0, which will both have
the bug fixed.
Cc: stable@vger.kernel.org # v5.15+
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221214232602.4118147-1-nathan@kernel.org
| -rw-r--r-- | security/Kconfig.hardening | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening index d766b7d0ffd1..53baa95cb644 100644 --- a/security/Kconfig.hardening +++ b/security/Kconfig.hardening @@ -257,6 +257,9 @@ config INIT_ON_FREE_DEFAULT_ON config CC_HAS_ZERO_CALL_USED_REGS def_bool $(cc-option,-fzero-call-used-regs=used-gpr) + # https://github.com/ClangBuiltLinux/linux/issues/1766 + # https://github.com/llvm/llvm-project/issues/59242 + depends on !CC_IS_CLANG || CLANG_VERSION > 150006 config ZERO_CALL_USED_REGS bool "Enable register zeroing on function exit" |