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[v1,RFC,Zisslpcfi,01/20] sslp stubs: shadow stack and landing pad stubs

Message ID 20230213045351.3945824-2-debug@rivosinc.com (mailing list archive)
State RFC
Delegated to: Palmer Dabbelt
Headers show
Series riscv control-flow integrity for U mode | expand

Checks

Context Check Description
conchuod/tree_selection fail Failed to apply to next/pending-fixes or riscv/for-next

Commit Message

Deepak Gupta Feb. 13, 2023, 4:53 a.m. UTC 
In absence of shadow stack config and landing pad instr config, stubs are
needed to indicate whether shadow stack & landing pad instr is supported.

In absence of config, these stubs return false (indicating no support)
In presence of config, an extern declaration is added and arch specific
implementation can choose to implement detection.

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
---
 include/linux/processor.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
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Patch

diff --git a/include/linux/processor.h b/include/linux/processor.h
index dc78bdc7079a..228aa95a7cd7 100644
--- a/include/linux/processor.h
+++ b/include/linux/processor.h
@@ -59,4 +59,21 @@  do {								\
 
 #endif
 
+#ifndef CONFIG_USER_SHADOW_STACK
+static inline bool arch_supports_shadow_stack(void)
+{
+	return false;
+}
+#else
+extern bool arch_supports_shadow_stack(void);
+#endif
+
+#ifndef CONFIG_USER_INDIRECT_BR_LP
+static inline bool arch_supports_indirect_br_lp_instr(void)
+{
+	return false;
+}
+#else
+extern bool arch_supports_indirect_br_lp_instr(void);
+#endif
 #endif /* _LINUX_PROCESSOR_H */