Sami Tolvanen c7eab89707 UPSTREAM: cfi: Use __builtin_function_start ...

Clang 14 added support for the __builtin_function_start function,
which allows us to implement the function_nocfi macro without
architecture-specific inline assembly and in a way that also works
with static initializers.

Change CONFIG_CFI_CLANG to depend on Clang >= 14, define
function_nocfi using __builtin_function_start, and remove the arm64
inline assembly implementation.

Link: ec2e26eaf6
Link: https://github.com/ClangBuiltLinux/linux/issues/1353
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will@kernel.org> # arm64
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>

Bug: 244543039
Bug: 244373730
Link: https://lore.kernel.org/r/20220405221618.633743-1-samitolvanen@google.com
(cherry picked from commit e6f3b3c9c109ed57230996cf4a4c1b8ae7e36a81)
Change-Id: I71d0e805fc66123107ff51f6e30d689948d64fa1
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>

2022-12-07 14:35:27 +00:00

2.6 KiB

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