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authorAndrey Konovalov <andreyknvl@google.com>2020-12-10 15:42:09 +1100
committerStephen Rothwell <sfr@canb.auug.org.au>2020-12-16 18:02:58 +1100
commit4fbc0b0a50b4e33c96869733b3d3f6db4bf91767 (patch)
tree222b40ffe0590e0f14b3aed1314d78907dfa5741
parente3abbc6ae2a12a594b89b886c80c94e0bc904816 (diff)
downloadlinux-4fbc0b0a50b4e33c96869733b3d3f6db4bf91767.tar.gz
kasan, arm64: move initialization message
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). Link: https://lkml.kernel.org/r/29a30ea4e1750450dd1f693d25b7b6cb05913ecf.1606161801.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Alexander Potapenko <glider@google.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Branislav Rankov <Branislav.Rankov@arm.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Marco Elver <elver@google.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
-rw-r--r--arch/arm64/include/asm/kasan.h9
-rw-r--r--arch/arm64/mm/kasan_init.c13
-rw-r--r--mm/kasan/generic.c2
-rw-r--r--mm/kasan/sw_tags.c4
4 files changed, 11 insertions, 17 deletions
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 303b451131c2..2447b4311f94 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -9,8 +9,6 @@
* Andrey Konovalov <andreyknvl@gmail.com>
*/
-#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 64540109c461..9445cf4ccdc8 100644
--- a/mm/kasan/sw_tags.c
+++ b/mm/kasan/sw_tags.c
@@ -6,7 +6,7 @@
* Author: Andrey Konovalov <andreyknvl@google.com>
*/
-#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");
}
/*