linux-kernel - [PATCH] kasan: add kasan mode messages when kasan init

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Message-ID: <20211019120413.20807-1-Kuan-Ying.Lee@mediatek.com>
Date:   Tue, 19 Oct 2021 20:04:13 +0800
From:   Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
To:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>
CC:     <chinwen.chang@...iatek.com>, <yee.lee@...iatek.com>,
        <nicholas.tang@...iatek.com>, <kasan-dev@...glegroups.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-mediatek@...ts.infradead.org>,
        Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
Subject: [PATCH] kasan: add kasan mode messages when kasan init

There are multiple kasan modes. It make 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@...iatek.com>
---
 arch/arm64/mm/kasan_init.c | 2 +-
 mm/kasan/hw_tags.c         | 4 +++-
 mm/kasan/sw_tags.c         | 2 +-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index 61b52a92b8b6..b4e78beac285 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -293,7 +293,7 @@ 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 05d1e9460e2e..3e28ecbe1d8f 100644
--- a/mm/kasan/hw_tags.c
+++ b/mm/kasan/hw_tags.c
@@ -168,7 +168,9 @@ 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_flag_async ? "async" : "sync",
+		kasan_stack_collection_enabled() ? "on" : "off");
 }
 
 void kasan_alloc_pages(struct page *page, unsigned int order, gfp_t flags)
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