Messages in this thread Patch in this message | | | Date | Mon, 9 Oct 2023 22:42:54 +0000 | Subject | [PATCH] x86: Enable IBT in Rust if enabled in C | From | Matthew Maurer <> |
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These flags are not made conditional on compiler support because at the moment exactly one version of rustc supported, and that one supports these flags.
Building without these additional flags will manifest as objtool printing a large number of errors about missing ENDBR and if CFI is enabled (not currently possible) will result in incorrectly structured function prefixes.
Signed-off-by: Matthew Maurer <mmaurer@google.com> ---
Split out the IBT additions as per https://lkml.kernel.org/linux-fsdevel/CANiq72kK6ppBE7j=z7uua1cJMKaLoR5U3NUAZXT5MrNEs9ZhfQ@mail.gmail.com/
arch/x86/Makefile | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 5bfe5caaa444..941f7abf6dbf 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -81,6 +81,7 @@ ifeq ($(CONFIG_X86_KERNEL_IBT),y) # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104816 # KBUILD_CFLAGS += $(call cc-option,-fcf-protection=branch -fno-jump-tables) +KBUILD_RUSTFLAGS += -Zcf-protection=branch -Zno-jump-tables else KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) endif -- 2.42.0.609.gbb76f46606-goog
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