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UPSTREAM: x86: Enable IBT in Rust if enabled in C

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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.

Change-Id: I07e70db23eaa7fb86f8ba7694000a6fea4332447
Signed-off-by: Matthew Maurer <mmaurer@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Link: https://lore.kernel.org/r/20231009224347.2076221-1-mmaurer@google.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
(cherry picked from commit 6a5c032c4b)
This commit is contained in:
Matthew Maurer 2023-10-09 22:42:54 +00:00 committed by Treehugger Robot
parent 37481c8f5a
commit 5341e12502
1 changed files with 1 additions and 0 deletions
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arch/x86/Makefile
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@ -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