x86: Add types to indirectly called assembly functions

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With CONFIG_CFI_CLANG, assembly functions indirectly called
from C code must be annotated with type identifiers to pass CFI
checking. Define the __CFI_TYPE helper macro to match the compiler
generated function preamble, and ensure SYM_TYPED_FUNC_START also
emits ENDBR with IBT.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Kees Cook <keescook@chromium.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220908215504.3686827-21-samitolvanen@google.com

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Sami Tolvanen 2022-09-08 14:55:02 -07:00 • committed by Kees Cook

parent ca7e10bff1

commit ccace936ee

3 changed files with 17 additions and 3 deletions

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5

arch/x86/crypto/blowfish-x86_64-asm_64.S

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12

arch/x86/include/asm/linkage.h

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3

arch/x86/lib/memcpy_64.S

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