linux-hardening - [RFC PATCH 15/21] static_call: Use cfi

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Message-Id: <20220429203644.2868448-16-samitolvanen@google.com>
Date:   Fri, 29 Apr 2022 13:36:38 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Joao Moreira <joao@...rdrivepizza.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-hardening@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, llvm@...ts.linux.dev,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: [RFC PATCH 15/21] static_call: Use cfi_unchecked

With CONFIG_HAVE_STATIC_CALL, static calls are patched into direct
calls. Disable indirect call CFI checking for the call sites with the
cfi_unchecked macro.

Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 include/linux/static_call.h             |  6 ++++--
 include/linux/static_call_types.h       |  9 ++++++---
 tools/include/linux/static_call_types.h | 13 ++++++++-----
 3 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/include/linux/static_call.h b/include/linux/static_call.h
index 7f1219fb98cf..f666c841b718 100644
--- a/include/linux/static_call.h
+++ b/include/linux/static_call.h
@@ -204,7 +204,8 @@ extern long __static_call_return0(void);
 	};								\
 	ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name)
 
-#define static_call_cond(name, args...)	(void)__static_call(name)(args)
+#define static_call_cond(name, args...)					\
+	(void)cfi_unchecked(__static_call(name)(args))
 
 #define EXPORT_STATIC_CALL(name)					\
 	EXPORT_SYMBOL(STATIC_CALL_KEY(name));				\
@@ -246,7 +247,8 @@ static inline int static_call_init(void) { return 0; }
 	};								\
 	ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name)
 
-#define static_call_cond(name, args...)	(void)__static_call(name)(args)
+#define static_call_cond(name, args...)					\
+	(void)cfi_unchecked(__static_call(name)(args))
 
 static inline
 void __static_call_update(struct static_call_key *key, void *tramp, void *func)
diff --git a/include/linux/static_call_types.h b/include/linux/static_call_types.h
index 7e1ce240a2cd..faebc1412c86 100644
--- a/include/linux/static_call_types.h
+++ b/include/linux/static_call_types.h
@@ -81,13 +81,16 @@ struct static_call_key {
 
 #ifdef MODULE
 #define __STATIC_CALL_MOD_ADDRESSABLE(name)
-#define static_call_mod(name, args...)	__raw_static_call(name)(args)
+#define static_call_mod(name, args...) \
+	cfi_unchecked(__raw_static_call(name)(args))
 #else
 #define __STATIC_CALL_MOD_ADDRESSABLE(name) __STATIC_CALL_ADDRESSABLE(name)
-#define static_call_mod(name, args...)	__static_call(name)(args)
+#define static_call_mod(name, args...) \
+	cfi_unchecked(__static_call(name)(args))
 #endif
 
-#define static_call(name, args...)	__static_call(name)(args)
+#define static_call(name, args...) \
+	cfi_unchecked(__static_call(name)(args))
 
 #else
 
diff --git a/tools/include/linux/static_call_types.h b/tools/include/linux/static_call_types.h
index 5a00b8b2cf9f..faebc1412c86 100644
--- a/tools/include/linux/static_call_types.h
+++ b/tools/include/linux/static_call_types.h
@@ -81,13 +81,16 @@ struct static_call_key {
 
 #ifdef MODULE
 #define __STATIC_CALL_MOD_ADDRESSABLE(name)
-#define static_call_mod(name)	__raw_static_call(name)
+#define static_call_mod(name, args...) \
+	cfi_unchecked(__raw_static_call(name)(args))
 #else
 #define __STATIC_CALL_MOD_ADDRESSABLE(name) __STATIC_CALL_ADDRESSABLE(name)
-#define static_call_mod(name)	__static_call(name)
+#define static_call_mod(name, args...) \
+	cfi_unchecked(__static_call(name)(args))
 #endif
 
-#define static_call(name)	__static_call(name)
+#define static_call(name, args...) \
+	cfi_unchecked(__static_call(name)(args))
 
 #else
 
@@ -95,8 +98,8 @@ struct static_call_key {
 	void *func;
 };
 
-#define static_call(name)						\
-	((typeof(STATIC_CALL_TRAMP(name))*)(STATIC_CALL_KEY(name).func))
+#define static_call(name, args...)					\
+	((typeof(STATIC_CALL_TRAMP(name))*)(STATIC_CALL_KEY(name).func))(args)
 
 #endif /* CONFIG_HAVE_STATIC_CALL */
 
-- 
2.36.0.464.gb9c8b46e94-goog