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add support for clang Control Flow Integrity (CFI)

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This change adds the CONFIG_CFI_CLANG option, CFI error handling,
and a faster look-up table for cross module CFI checks.

Bug: 67506682
Change-Id: Ic009f0a629b552a0eb16e6d89808c7029e91447d
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen
2017-05-11 15:03:36 -07:00
parent b13cf8585d
commit 00a195e7c0
13 changed files with 444 additions and 2 deletions
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3
include/asm-generic/vmlinux.lds.h
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@@ -67,10 +67,12 @@
*/
#ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
#define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
#define TEXT_CFI_MAIN .text.cfi .text.[0-9a-zA-Z_]*.cfi
#define DATA_MAIN .data .data.[0-9a-zA-Z_]*
#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
#else
#define TEXT_MAIN .text
#define TEXT_CFI_MAIN .text.cfi
#define DATA_MAIN .data
#define BSS_MAIN .bss
#endif
@@ -461,6 +463,7 @@
ALIGN_FUNCTION(); \
*(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \
*(.text..ftrace) \
*(TEXT_CFI_MAIN) \
*(.ref.text) \
MEM_KEEP(init.text) \
MEM_KEEP(exit.text) \