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Subject[PATCH 3/5] kasan: use unchecked __memset internally
Date
From: Andrey Konovalov <andreyknvl@google.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@google.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
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