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authorSami Tolvanen <samitolvanen@google.com>2022-09-08 14:54:47 -0700
committerKees Cook <keescook@chromium.org>2022-09-26 10:13:13 -0700
commit89245600941e4e0f87d77f60ee269b5e61ef4e49 (patch)
treea0069b5bd625907cb854091e6dbbeed4964815b0 /scripts
parent92efda8eb15295a07f450828b2db14485bfc09c2 (diff)
cfi: Switch to -fsanitize=kcfi
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
Diffstat (limited to 'scripts')
-rw-r--r--scripts/module.lds.S23
1 files changed, 4 insertions, 19 deletions
diff --git a/scripts/module.lds.S b/scripts/module.lds.S
index 3a3aa2354ed8..da4bddd26171 100644
--- a/scripts/module.lds.S
+++ b/scripts/module.lds.S
@@ -3,20 +3,10 @@
* Archs are free to supply their own linker scripts. ld will
* combine them automatically.
*/
-#ifdef CONFIG_CFI_CLANG
-# include <asm/page.h>
-# define ALIGN_CFI ALIGN(PAGE_SIZE)
-# define SANITIZER_DISCARDS *(.eh_frame)
-#else
-# define ALIGN_CFI
-# define SANITIZER_DISCARDS
-#endif
-
SECTIONS {
/DISCARD/ : {
*(.discard)
*(.discard.*)
- SANITIZER_DISCARDS
}
__ksymtab 0 : { *(SORT(___ksymtab+*)) }
@@ -33,6 +23,10 @@ SECTIONS {
__patchable_function_entries : { *(__patchable_function_entries) }
+#ifdef CONFIG_ARCH_USES_CFI_TRAPS
+ __kcfi_traps : { KEEP(*(.kcfi_traps)) }
+#endif
+
#ifdef CONFIG_LTO_CLANG
/*
* With CONFIG_LTO_CLANG, LLD always enables -fdata-sections and
@@ -53,15 +47,6 @@ SECTIONS {
*(.rodata .rodata.[0-9a-zA-Z_]*)
*(.rodata..L*)
}
-
- /*
- * With CONFIG_CFI_CLANG, we assume __cfi_check is at the beginning
- * of the .text section, and is aligned to PAGE_SIZE.
- */
- .text : ALIGN_CFI {
- *(.text.__cfi_check)
- *(.text .text.[0-9a-zA-Z_]* .text..L.cfi*)
- }
#endif
}