[v8,17/43] kasan, arm64: move initialization message

Commit Message

Andrey Konovalov Nov. 4, 2020, 11:18 p.m. UTC

Software tag-based KASAN mode is fully initialized with kasan_init_tags(),
while the generic mode only requires kasan_init(). Move the
initialization message for tag-based mode into kasan_init_tags().

Also fix pr_fmt() usage for KASAN code: generic.c doesn't need it as it
doesn't use any printing functions; tag-based mode should use "kasan:"
instead of KBUILD_MODNAME (which stands for file name).

Signed-off-by: Andrey Konovalov <[e-mail]>
---
Change-Id: Iddca9764b30ff0fab1922f26ca9d4f39b6f22673
---
 arch/arm64/include/asm/kasan.h |  9 +++------
 arch/arm64/mm/kasan_init.c     | 13 +++++--------
 mm/kasan/generic.c             |  2 --
 mm/kasan/sw_tags.c             |  4 +++-
 4 files changed, 11 insertions(+), 17 deletions(-)

Comments

Catalin Marinas Nov. 5, 2020, 3:59 p.m. UTC | #1

On Thu, Nov 05, 2020 at 12:18:32AM +0100, Andrey Konovalov wrote:
> Software tag-based KASAN mode is fully initialized with kasan_init_tags(),
> while the generic mode only requires kasan_init(). Move the
> initialization message for tag-based mode into kasan_init_tags().
> 
> Also fix pr_fmt() usage for KASAN code: generic.c doesn't need it as it
> doesn't use any printing functions; tag-based mode should use "kasan:"
> instead of KBUILD_MODNAME (which stands for file name).
> 
> Signed-off-by: Andrey Konovalov <[e-mail]>

Reviewed-by: Catalin Marinas <[e-mail]>

Patch

diff --git a/arch/arm64/include/asm/kasan.h b/arch/arm64/include/asm/kasan.h
index f7ea70d02cab..0aaf9044cd6a 100644
--- a/arch/arm64/include/asm/kasan.h
+++ b/arch/arm64/include/asm/kasan.h
@@ -12,14 +12,10 @@ 
 #define arch_kasan_reset_tag(addr)	__tag_reset(addr)
 #define arch_kasan_get_tag(addr)	__tag_get(addr)
 
-#ifdef CONFIG_KASAN
-void kasan_init(void);
-#else
-static inline void kasan_init(void) { }
-#endif
-
 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
 
+void kasan_init(void);
+
 /*
  * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
  * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
@@ -43,6 +39,7 @@  void kasan_copy_shadow(pgd_t *pgdir);
 asmlinkage void kasan_early_init(void);
 
 #else
+static inline void kasan_init(void) { }
 static inline void kasan_copy_shadow(pgd_t *pgdir) { }
 #endif
 
diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index 5172799f831f..e35ce04beed1 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -278,17 +278,14 @@  static void __init kasan_init_depth(void)
 	init_task.kasan_depth = 0;
 }
 
-#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) */
-
-static inline void __init kasan_init_shadow(void) { }
-
-static inline void __init kasan_init_depth(void) { }
-
-#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
-
 void __init kasan_init(void)
 {
 	kasan_init_shadow();
 	kasan_init_depth();
+#if defined(CONFIG_KASAN_GENERIC)
+	/* CONFIG_KASAN_SW_TAGS also requires kasan_init_tags(). */
 	pr_info("KernelAddressSanitizer initialized\n");
+#endif
 }
+
+#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index e1af3b6c53b8..adb254df1b1d 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -9,8 +9,6 @@ 
  *        Andrey Konovalov <[e-mail]>
  */
 
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
 #include <linux/export.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c
index b2638c2cd58a..d25f8641b7cd 100644
--- a/mm/kasan/sw_tags.c
+++ b/mm/kasan/sw_tags.c
@@ -6,7 +6,7 @@ 
  * Author: Andrey Konovalov <[e-mail]>
  */
 
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#define pr_fmt(fmt) "kasan: " fmt
 
 #include <linux/export.h>
 #include <linux/interrupt.h>
@@ -41,6 +41,8 @@  void kasan_init_tags(void)
 
 	for_each_possible_cpu(cpu)
 		per_cpu(prng_state, cpu) = (u32)get_cycles();
+
+	pr_info("KernelAddressSanitizer initialized\n");
 }
 
 /*