linux-hardening - [PATCH v2 5/6] kasan: Add (pmd|pud)_init for LoongArch zero_(pud|p4d)

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Date:   Tue,  4 Apr 2023 16:43:07 +0800
From:   Qing Zhang <zhangqing@...ngson.cn>
To:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Huacai Chen <chenhuacai@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        WANG Xuerui <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        kasan-dev@...glegroups.com, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH v2 5/6] kasan: Add (pmd|pud)_init for LoongArch zero_(pud|p4d)_populate process

Loongarch populate pmd/pud with invalid_pmd_table/invalid_pud_table in
pagetable_init, So pmd_init/pud_init(p) is required, define them as __weak
in mm/kasan/init.c, like mm/sparse-vmemmap.c.

Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
---
 mm/kasan/init.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/mm/kasan/init.c b/mm/kasan/init.c
index cc64ed6858c6..a7fa223b96e4 100644
--- a/mm/kasan/init.c
+++ b/mm/kasan/init.c
@@ -139,6 +139,10 @@ static int __ref zero_pmd_populate(pud_t *pud, unsigned long addr,
 	return 0;
 }
 
+void __weak __meminit pmd_init(void *addr)
+{
+}
+
 static int __ref zero_pud_populate(p4d_t *p4d, unsigned long addr,
 				unsigned long end)
 {
@@ -166,8 +170,9 @@ static int __ref zero_pud_populate(p4d_t *p4d, unsigned long addr,
 				if (!p)
 					return -ENOMEM;
 			} else {
-				pud_populate(&init_mm, pud,
-					early_alloc(PAGE_SIZE, NUMA_NO_NODE));
+				p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
+				pmd_init(p);
+				pud_populate(&init_mm, pud, p);
 			}
 		}
 		zero_pmd_populate(pud, addr, next);
@@ -176,6 +181,10 @@ static int __ref zero_pud_populate(p4d_t *p4d, unsigned long addr,
 	return 0;
 }
 
+void __weak __meminit pud_init(void *addr)
+{
+}
+
 static int __ref zero_p4d_populate(pgd_t *pgd, unsigned long addr,
 				unsigned long end)
 {
@@ -207,8 +216,9 @@ static int __ref zero_p4d_populate(pgd_t *pgd, unsigned long addr,
 				if (!p)
 					return -ENOMEM;
 			} else {
-				p4d_populate(&init_mm, p4d,
-					early_alloc(PAGE_SIZE, NUMA_NO_NODE));
+				p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
+				pud_init(p);
+				p4d_populate(&init_mm, p4d, p);
 			}
 		}
 		zero_pud_populate(p4d, addr, next);
-- 
2.20.1