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 <Kuan-Ying.Lee@xxxxxxxxxxxx>
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@xxxxxxxxxxxx
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Chinwen Chang <chinwen.chang@xxxxxxxxxxxx>
Cc: Yee Lee <yee.lee@xxxxxxxxxxxx>
Cc: Nicholas Tang <nicholas.tang@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxxxx are
kasan-add-kasan-mode-messages-when-kasan-init.patch
