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security: Restrict CONFIG_ZERO_CALL_USED_REGS to gcc or clang > 15.0.6

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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
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Nathan Chancellor 2022-12-14 16:26:03 -07:00 committed by Kees Cook
parent f68022ae0a
commit d6a9fb87e9
1 changed files with 3 additions and 0 deletions
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security/Kconfig.hardening
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@ -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"