Commit b873e986 authored by Kuan-Ying Lee's avatar Kuan-Ying Lee Committed by Linus Torvalds
Browse files

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 active when booting up [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: default avatarKuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Reviewed-by: default avatarMarco Elver <elver@google.com>
Reviewed-by: default avatarDavid Hildenbrand <david@redhat.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 <chinwen.chang@mediatek.com>
Cc: Yee Lee <yee.lee@mediatek.com>
Cc: Nicholas Tang <nicholas.tang@mediatek.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ab2f9d2d

arch/arm64/mm/kasan_init.c

+1 −1
Original line number Diff line number Diff line
@@ -310,7 +310,7 @@ 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

}

mm/kasan/hw_tags.c

+13 −1
Original line number Diff line number Diff line
@@ -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)

mm/kasan/sw_tags.c

+1 −1
Original line number Diff line number Diff line
@@ -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");

}



/*