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Subject[PATCH v2] kasan: add kasan mode messages when kasan init
Date
There are multiple kasan modes. It makes sense that we add some messages
to know which kasan mode is when booting up. see [1].

Link: https://bugzilla.kernel.org/show_bug.cgi?id=212195 [1]
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
---
change since v2:
- Rebase to linux-next
- HW-tags based mode need to consider asymm mode
- Thanks for Marco's suggestion

arch/arm64/mm/kasan_init.c | 2 +-
mm/kasan/hw_tags.c | 4 +++-
mm/kasan/kasan.h | 10 ++++++++++
mm/kasan/sw_tags.c | 2 +-
4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index 5b996ca4d996..6f5a6fe8edd7 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -309,7 +309,7 @@ void __init kasan_init(void)
kasan_init_depth();
#if defined(CONFIG_KASAN_GENERIC)
/* CONFIG_KASAN_SW_TAGS also requires kasan_init_sw_tags(). */
- pr_info("KernelAddressSanitizer initialized\n");
+ pr_info("KernelAddressSanitizer initialized (generic)\n");
#endif
}

diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
index dc892119e88f..1d5c89c7cdfe 100644
--- a/mm/kasan/hw_tags.c
+++ b/mm/kasan/hw_tags.c
@@ -177,7 +177,9 @@ void __init kasan_init_hw_tags(void)
break;
}

- pr_info("KernelAddressSanitizer initialized\n");
+ pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, stacktrace=%s)\n",
+ kasan_mode_info(),
+ kasan_stack_collection_enabled() ? "on" : "off");
}

void kasan_alloc_pages(struct page *page, unsigned int order, gfp_t flags)
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index aebd8df86a1f..387ed7b6de37 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -36,6 +36,16 @@ static inline bool kasan_sync_fault_possible(void)
{
return kasan_mode == KASAN_MODE_SYNC || kasan_mode == KASAN_MODE_ASYMM;
}
+
+static inline const char *kasan_mode_info(void)
+{
+ if (kasan_mode == KASAN_MODE_ASYNC)
+ return "async";
+ else if (kasan_mode == KASAN_MODE_ASYMM)
+ return "asymm";
+ else
+ return "sync";
+}
#else

static inline bool kasan_stack_collection_enabled(void)
diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c
index bd3f540feb47..77f13f391b57 100644
--- a/mm/kasan/sw_tags.c
+++ b/mm/kasan/sw_tags.c
@@ -42,7 +42,7 @@ void __init kasan_init_sw_tags(void)
for_each_possible_cpu(cpu)
per_cpu(prng_state, cpu) = (u32)get_cycles();

- pr_info("KernelAddressSanitizer initialized\n");
+ pr_info("KernelAddressSanitizer initialized (sw-tags)\n");
}

/*
--
2.18.0
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