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

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Date:   Wed, 5 Apr 2023 00:09:19 +0200
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Qing Zhang <zhangqing@...ngson.cn>
Cc:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Huacai Chen <chenhuacai@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Potapenko <glider@...gle.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: Re: [PATCH v2 5/6] kasan: Add (pmd|pud)_init for LoongArch
 zero_(pud|p4d)_populate process

On Tue, Apr 4, 2023 at 10:43 AM Qing Zhang <zhangqing@...ngson.cn> wrote:
>
> 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
>

Reviewed-by: Andrey Konovalov <andreyknvl@...il.com>

Thanks!