[PATCH v3] kasan: add kasan mode messages when kasan init
From: Kuan-Ying Lee <hidden>
Date: 2021-10-20 09:49:08
Also in:
linux-mediatek, linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), kasan, memory management, the rest · Maintainers:
Catalin Marinas, Will Deacon, Andrey Ryabinin, Andrew Morton, Linus Torvalds
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 <redacted> --- v3: - Rebase to linux-next - Move kasan_mode_info() into hw_tags.c v2: - Rebase to linux-next - HW-tag based mode need to consider asymm mode - Thanks Marco's suggestion 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(-)
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..7355cb534e4f 100644
--- a/mm/kasan/hw_tags.c
+++ b/mm/kasan/hw_tags.c@@ -106,6 +106,16 @@ static int __init early_kasan_flag_stacktrace(char *arg) } 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)
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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