linux-kernel - [PATCH 3/5] kasan: use unchecked _

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Message-Id: <6f621966c6f52241b5aaa7220c348be90c075371.1696605143.git.andreyknvl@google.com>
Date:   Fri,  6 Oct 2023 17:18:44 +0200
From:   andrey.konovalov@...ux.dev
To:     Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 3/5] kasan: use unchecked __memset internally

From: Andrey Konovalov <andreyknvl@...gle.com>

KASAN code is supposed to use the unchecked __memset implementation when
accessing its metadata.

Change uses of memset to __memset in mm/kasan/.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 mm/kasan/report.c | 4 ++--
 mm/kasan/shadow.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index ca4b6ff080a6..12557ffee90b 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -538,7 +538,7 @@ void kasan_report_invalid_free(void *ptr, unsigned long ip, enum kasan_report_ty
 
 	start_report(&flags, true);
 
-	memset(&info, 0, sizeof(info));
+	__memset(&info, 0, sizeof(info));
 	info.type = type;
 	info.access_addr = ptr;
 	info.access_size = 0;
@@ -576,7 +576,7 @@ bool kasan_report(const void *addr, size_t size, bool is_write,
 
 	start_report(&irq_flags, true);
 
-	memset(&info, 0, sizeof(info));
+	__memset(&info, 0, sizeof(info));
 	info.type = KASAN_REPORT_ACCESS;
 	info.access_addr = addr;
 	info.access_size = size;
diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
index dd772f9d0f08..d687f09a7ae3 100644
--- a/mm/kasan/shadow.c
+++ b/mm/kasan/shadow.c
@@ -324,7 +324,7 @@ static int kasan_populate_vmalloc_pte(pte_t *ptep, unsigned long addr,
 	if (!page)
 		return -ENOMEM;
 
-	memset((void *)page, KASAN_VMALLOC_INVALID, PAGE_SIZE);
+	__memset((void *)page, KASAN_VMALLOC_INVALID, PAGE_SIZE);
 	pte = pfn_pte(PFN_DOWN(__pa(page)), PAGE_KERNEL);
 
 	spin_lock(&init_mm.page_table_lock);
-- 
2.25.1