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cfi: Switch to -fsanitize=kcfi

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Switch from Clang's original forward-edge control-flow integrity
implementation to -fsanitize=kcfi, which is better suited for the
kernel, as it doesn't require LTO, doesn't use a jump table that
requires altering function references, and won't break cross-module
function address equality.

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/20220908215504.3686827-6-samitolvanen@google.com
This commit is contained in:
Sami Tolvanen 2022-09-08 14:54:47 -07:00 • committed by Kees Cook
parent 92efda8eb1
commit 8924560094
9 changed files with 139 additions and 182 deletions
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14
include/linux/compiler-clang.h
View file

@ -66,17 +66,9 @@
# define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
#endif
#define __nocfi __attribute__((__no_sanitize__("cfi")))
#define __cficanonical __attribute__((__cfi_canonical_jump_table__))
#if defined(CONFIG_CFI_CLANG)
/*
* With CONFIG_CFI_CLANG, the compiler replaces function address
* references with the address of the function's CFI jump table
* entry. The function_nocfi macro always returns the address of the
* actual function instead.
*/
#define function_nocfi(x) __builtin_function_start(x)
#if __has_feature(kcfi)
/* Disable CFI checking inside a function. */
#define __nocfi __attribute__((__no_sanitize__("kcfi")))
#endif
/*