[PATCH v5 04/22] cfi: Drop __CFI_ADDRESSABLE

From: Sami Tolvanen <samitolvanen@google.com>
To: linux-kernel@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	 Peter Zijlstra <peterz@infradead.org>,
	x86@kernel.org,  Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	 Mark Rutland <mark.rutland@arm.com>,
	Nathan Chancellor <nathan@kernel.org>,
	 Nick Desaulniers <ndesaulniers@google.com>,
	Joao Moreira <joao@overdrivepizza.com>,
	 Sedat Dilek <sedat.dilek@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	 linux-hardening@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,  llvm@lists.linux.dev,
	Sami Tolvanen <samitolvanen@google.com>
Subject: [PATCH v5 04/22] cfi: Drop __CFI_ADDRESSABLE
Date: Thu,  8 Sep 2022 14:54:46 -0700	[thread overview]
Message-ID: <20220908215504.3686827-5-samitolvanen@google.com> (raw)
In-Reply-To: <20220908215504.3686827-1-samitolvanen@google.com>

The __CFI_ADDRESSABLE macro is used for init_module and cleanup_module
to ensure we have the address of the CFI jump table, and with
CONFIG_X86_KERNEL_IBT to ensure LTO won't optimize away the symbols.
As __CFI_ADDRESSABLE is no longer necessary with -fsanitize=kcfi, add
a more flexible version of the __ADDRESSABLE macro and always ensure
these symbols won't be dropped.

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>
---
 include/linux/cfi.h      | 20 --------------------
 include/linux/compiler.h |  6 ++++--
 include/linux/module.h   |  4 ++--
 3 files changed, 6 insertions(+), 24 deletions(-)

diff --git a/include/linux/cfi.h b/include/linux/cfi.h
index 4ab51c067007..2cdbc0fbd0ab 100644
--- a/include/linux/cfi.h
+++ b/include/linux/cfi.h
@@ -13,26 +13,6 @@ typedef void (*cfi_check_fn)(uint64_t id, void *ptr, void *diag);
 /* Compiler-generated function in each module, and the kernel */
 extern void __cfi_check(uint64_t id, void *ptr, void *diag);
 
-/*
- * Force the compiler to generate a CFI jump table entry for a function
- * and store the jump table address to __cfi_jt_<function>.
- */
-#define __CFI_ADDRESSABLE(fn, __attr) \
-	const void *__cfi_jt_ ## fn __visible __attr = (void *)&fn
-
-#else /* !CONFIG_CFI_CLANG */
-
-#ifdef CONFIG_X86_KERNEL_IBT
-
-#define __CFI_ADDRESSABLE(fn, __attr) \
-	const void *__cfi_jt_ ## fn __visible __attr = (void *)&fn
-
-#endif /* CONFIG_X86_KERNEL_IBT */
-
 #endif /* CONFIG_CFI_CLANG */
 
-#ifndef __CFI_ADDRESSABLE
-#define __CFI_ADDRESSABLE(fn, __attr)
-#endif
-
 #endif /* _LINUX_CFI_H */
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 7713d7bcdaea..7bfafc69172a 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -221,9 +221,11 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
  * otherwise, or eliminated entirely due to lack of references that are
  * visible to the compiler.
  */
-#define __ADDRESSABLE(sym) \
-	static void * __section(".discard.addressable") __used \
+#define ___ADDRESSABLE(sym, __attrs) \
+	static void * __used __attrs \
 		__UNIQUE_ID(__PASTE(__addressable_,sym)) = (void *)&sym;
+#define __ADDRESSABLE(sym) \
+	___ADDRESSABLE(sym, __section(".discard.addressable"))
 
 /**
  * offset_to_ptr - convert a relative memory offset to an absolute pointer
diff --git a/include/linux/module.h b/include/linux/module.h
index 518296ea7f73..8937b020ec04 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -132,7 +132,7 @@ extern void cleanup_module(void);
 	{ return initfn; }					\
 	int init_module(void) __copy(initfn)			\
 		__attribute__((alias(#initfn)));		\
-	__CFI_ADDRESSABLE(init_module, __initdata);
+	___ADDRESSABLE(init_module, __initdata);
 
 /* This is only required if you want to be unloadable. */
 #define module_exit(exitfn)					\
@@ -140,7 +140,7 @@ extern void cleanup_module(void);
 	{ return exitfn; }					\
 	void cleanup_module(void) __copy(exitfn)		\
 		__attribute__((alias(#exitfn)));		\
-	__CFI_ADDRESSABLE(cleanup_module, __exitdata);
+	___ADDRESSABLE(cleanup_module, __exitdata);
 
 #endif
 
-- 
2.37.2.789.g6183377224-goog

