linux-kernel - [PATCH] arm/kasan: kasan_alloc a more precise size for pte

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Message-Id: <20210110131500.12378-1-liuhailongg6@163.com>
Date:   Sun, 10 Jan 2021 21:15:00 +0800
From:   Hailong Liu <liuhailongg6@....com>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>, linus.walleij@...aro.org
Cc:     Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, liuhailongg6@....com,
        Hailong Liu <liu.hailong6@....com.cn>
Subject: [PATCH] arm/kasan: kasan_alloc a more precise size for pte

From: Hailong Liu <liu.hailong6@....com.cn>

The *PTE_HWTABLE_OFF + PTE_HWTABLE_SIZE* may be a more accurate and
meaningful size for PTE tables than *PAGE_SIZE* when populating the
PMD entries for arm.

Signed-off-by: Hailong Liu <liu.hailong6@....com.cn>
---
 arch/arm/mm/kasan_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c
index 9c348042a724..c2a697704d6c 100644
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c
@@ -99,7 +99,7 @@ static void __init kasan_pmd_populate(pud_t *pudp, unsigned long addr,
 			 * allocated.
 			 */
 			void *p = early ? kasan_early_shadow_pte :
-				kasan_alloc_block(PAGE_SIZE);
+				kasan_alloc_block(PTE_HWTABLE_OFF + PTE_HWTABLE_SIZE);
 
 			if (!p) {
 				panic("%s failed to allocate shadow block for address 0x%lx\n",
-- 
2.17.1