linux-kernel - [PATCH v6 2/2] kasan: call kasan_init_generic in kasan

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Message-Id: <20250810125746.1105476-3-snovitoll@gmail.com>
Date: Sun, 10 Aug 2025 17:57:46 +0500
From: Sabyrzhan Tasbolatov <snovitoll@...il.com>
To: ryabinin.a.a@...il.com,
	christophe.leroy@...roup.eu,
	bhe@...hat.com,
	hca@...ux.ibm.com,
	andreyknvl@...il.com,
	akpm@...ux-foundation.org,
	zhangqing@...ngson.cn,
	chenhuacai@...ngson.cn,
	davidgow@...gle.com,
	glider@...gle.com,
	dvyukov@...gle.com,
	alexghiti@...osinc.com
Cc: alex@...ti.fr,
	agordeev@...ux.ibm.com,
	vincenzo.frascino@....com,
	elver@...gle.com,
	kasan-dev@...glegroups.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linuxppc-dev@...ts.ozlabs.org,
	linux-riscv@...ts.infradead.org,
	linux-s390@...r.kernel.org,
	linux-um@...ts.infradead.org,
	linux-mm@...ck.org,
	snovitoll@...il.com
Subject: [PATCH v6 2/2] kasan: call kasan_init_generic in kasan_init

Call kasan_init_generic() which handles Generic KASAN initialization.
For architectures that do not select ARCH_DEFER_KASAN,
this will be a no-op for the runtime flag but will
print the initialization banner.

For SW_TAGS and HW_TAGS modes, their respective init functions will
handle the flag enabling, if they are enabled/implemented.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217049
Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@...il.com>
Tested-by: Alexandre Ghiti <alexghiti@...osinc.com> # riscv
Acked-by: Alexander Gordeev <agordeev@...ux.ibm.com> # s390
---
Changes in v6:
- Call kasan_init_generic() in arch/riscv _after_ local_flush_tlb_all()
---
 arch/arm/mm/kasan_init.c    | 2 +-
 arch/arm64/mm/kasan_init.c  | 4 +---
 arch/riscv/mm/kasan_init.c  | 1 +
 arch/s390/kernel/early.c    | 3 ++-
 arch/x86/mm/kasan_init_64.c | 2 +-
 arch/xtensa/mm/kasan_init.c | 2 +-
 6 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c
index 111d4f703136..c6625e808bf8 100644
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c
@@ -300,6 +300,6 @@ void __init kasan_init(void)
 	local_flush_tlb_all();
 
 	memset(kasan_early_shadow_page, 0, PAGE_SIZE);
-	pr_info("Kernel address sanitizer initialized\n");
 	init_task.kasan_depth = 0;
+	kasan_init_generic();
 }
diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index d541ce45daeb..abeb81bf6ebd 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -399,14 +399,12 @@ void __init kasan_init(void)
 {
 	kasan_init_shadow();
 	kasan_init_depth();
-#if defined(CONFIG_KASAN_GENERIC)
+	kasan_init_generic();
 	/*
 	 * Generic KASAN is now fully initialized.
 	 * Software and Hardware Tag-Based modes still require
 	 * kasan_init_sw_tags() and kasan_init_hw_tags() correspondingly.
 	 */
-	pr_info("KernelAddressSanitizer initialized (generic)\n");
-#endif
 }
 
 #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index 41c635d6aca4..c4a2a9e5586e 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@ -533,4 +533,5 @@ void __init kasan_init(void)
 
 	csr_write(CSR_SATP, PFN_DOWN(__pa(swapper_pg_dir)) | satp_mode);
 	local_flush_tlb_all();
+	kasan_init_generic();
 }
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 9adfbdd377dc..544e5403dd91 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -21,6 +21,7 @@
 #include <linux/kernel.h>
 #include <asm/asm-extable.h>
 #include <linux/memblock.h>
+#include <linux/kasan.h>
 #include <asm/access-regs.h>
 #include <asm/asm-offsets.h>
 #include <asm/machine.h>
@@ -65,7 +66,7 @@ static void __init kasan_early_init(void)
 {
 #ifdef CONFIG_KASAN
 	init_task.kasan_depth = 0;
-	pr_info("KernelAddressSanitizer initialized\n");
+	kasan_init_generic();
 #endif
 }
 
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 0539efd0d216..998b6010d6d3 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -451,5 +451,5 @@ void __init kasan_init(void)
 	__flush_tlb_all();
 
 	init_task.kasan_depth = 0;
-	pr_info("KernelAddressSanitizer initialized\n");
+	kasan_init_generic();
 }
diff --git a/arch/xtensa/mm/kasan_init.c b/arch/xtensa/mm/kasan_init.c
index f39c4d83173a..0524b9ed5e63 100644
--- a/arch/xtensa/mm/kasan_init.c
+++ b/arch/xtensa/mm/kasan_init.c
@@ -94,5 +94,5 @@ void __init kasan_init(void)
 
 	/* At this point kasan is fully initialized. Enable error messages. */
 	current->kasan_depth = 0;
-	pr_info("KernelAddressSanitizer initialized\n");
+	kasan_init_generic();
 }
-- 
2.34.1