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randstruct: disable Clang 15 support

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The randstruct support released in Clang 15 is unsafe to use due to a
bug that can cause miscompilations: "-frandomize-layout-seed
inconsistently randomizes all-function-pointers structs"
(https://github.com/llvm/llvm-project/issues/60349).  It has been fixed
on the Clang 16 release branch, so add a Clang version check.

Fixes: 035f7f87b7 ("randstruct: Enable Clang support")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Bill Wendling <morbo@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230208065133.220589-1-ebiggers@kernel.org
This commit is contained in:
Eric Biggers 2023-02-07 22:51:33 -08:00 committed by Kees Cook
parent 04ffde1319
commit 78f7a3fd6d
1 changed files with 3 additions and 0 deletions
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3
security/Kconfig.hardening
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@ -281,6 +281,9 @@ endmenu
config CC_HAS_RANDSTRUCT
def_bool $(cc-option,-frandomize-layout-seed-file=/dev/null)
# Randstruct was first added in Clang 15, but it isn't safe to use until
# Clang 16 due to https://github.com/llvm/llvm-project/issues/60349
depends on !CC_IS_CLANG || CLANG_VERSION >= 160000
choice
prompt "Randomize layout of sensitive kernel structures"