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Subject[PATCH] randstruct: temporarily disable clang support
Date
From: Eric Biggers <ebiggers@google.com>

Randstruct with clang is currently unsafe to use in any clang release
that supports it, due to a clang bug that is causing miscompilations:
"-frandomize-layout-seed inconsistently randomizes all-function-pointers
structs" (https://github.com/llvm/llvm-project/issues/60349). Disable
it temporarily until the bug is fixed and the fix is released in a clang
version that can be checked for.

Fixes: 035f7f87b729 ("randstruct: Enable Clang support")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
security/Kconfig.hardening | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening
index 53baa95cb644..aad16187148c 100644
--- a/security/Kconfig.hardening
+++ b/security/Kconfig.hardening
@@ -280,7 +280,8 @@ config ZERO_CALL_USED_REGS
endmenu

config CC_HAS_RANDSTRUCT
- def_bool $(cc-option,-frandomize-layout-seed-file=/dev/null)
+ # Temporarily disabled due to https://github.com/llvm/llvm-project/issues/60349
+ def_bool n

choice
prompt "Randomize layout of sensitive kernel structures"
base-commit: 7b753a909f426f2789d9db6f357c3d59180a9354
--
2.39.1

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