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authorEric Biggers <ebiggers@google.com>2023-02-08 09:51:33 +0300
committerKees Cook <keescook@chromium.org>2023-02-09 02:26:58 +0300
commit78f7a3fd6dc66cb788c21d7705977ed13c879351 (patch)
tree3b944e79e841f17cb07a353f5ab97efc88fd6f36 /security
parent04ffde1319a715bd0550ded3580d4ea3bc003776 (diff)
downloadlinux-78f7a3fd6dc66cb788c21d7705977ed13c879351.tar.xz
randstruct: disable Clang 15 support
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: 035f7f87b729 ("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
Diffstat (limited to 'security')
-rw-r--r--security/Kconfig.hardening3
1 files changed, 3 insertions, 0 deletions
diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening
index 53baa95cb644..0f295961e773 100644
--- a/security/Kconfig.hardening
+++ b/security/Kconfig.hardening
@@ -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"