+ kasan-add-kasan-mode-messages-when-kasan-init.patch added to -mm tree

The patch titled
     Subject: kasan: add kasan mode messages when kasan init
has been added to the -mm tree.  Its filename is
     kasan-add-kasan-mode-messages-when-kasan-init.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/kasan-add-kasan-mode-messages-when-kasan-init.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/kasan-add-kasan-mode-messages-when-kasan-init.patch

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------------------------------------------------------
From: Kuan-Ying Lee <redacted>
Subject: kasan: add kasan mode messages when kasan init

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]
Link: https://lkml.kernel.org/r/20211020094850.4113-1-Kuan-Ying.Lee@mediatek.com
Signed-off-by: Kuan-Ying Lee <redacted>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Chinwen Chang <redacted>
Cc: Yee Lee <redacted>
Cc: Nicholas Tang <redacted>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/mm/kasan_init.c |    2 +-
 mm/kasan/hw_tags.c         |   14 +++++++++++++-
 mm/kasan/sw_tags.c         |    2 +-
 3 files changed, 15 insertions(+), 3 deletions(-)

--- a/arch/arm64/mm/kasan_init.c~kasan-add-kasan-mode-messages-when-kasan-init
+++ a/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
 }
 
--- a/mm/kasan/hw_tags.c~kasan-add-kasan-mode-messages-when-kasan-init
+++ a/mm/kasan/hw_tags.c

@@ -106,6 +106,16 @@ static int __init early_kasan_flag_stack
 }
 early_param("kasan.stacktrace", early_kasan_flag_stacktrace);
 
+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";
+}
+
 /* kasan_init_hw_tags_cpu() is called for each CPU. */
 void kasan_init_hw_tags_cpu(void)
 {

@@ -177,7 +187,9 @@ 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)
--- a/mm/kasan/sw_tags.c~kasan-add-kasan-mode-messages-when-kasan-init
+++ a/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");
 }
 
 /*

_

Patches currently in -mm which might be from Kuan-Ying.Lee@mediatek.com are

kasan-add-kasan-mode-messages-when-kasan-init.patch