linux-kernel - Re: [PATCH 1/4] sparc32: mm: Fix argument checking in __srmmu_get

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Message-ID: <CAKwvOd=_v__=b6ijFYkxgDsmxakmkxwDWFG48601Gh9cyhj3PA@mail.gmail.com>
Date:   Tue, 24 Mar 2020 10:41:52 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Will Deacon <will@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...roid.com>,
        "David S. Miller" <davem@...emloft.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        sparclinux@...r.kernel.org
Subject: Re: [PATCH 1/4] sparc32: mm: Fix argument checking in __srmmu_get_nocache()

On Tue, Mar 24, 2020 at 3:52 AM Will Deacon <will@...nel.org> wrote:
>
> The 'size' argument to __srmmu_get_nocache() is a number of bytes not
> a shift value, so fix up the sanity checking to treat it properly.
>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Will Deacon <will@...nel.org>
> ---
>  arch/sparc/mm/srmmu.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
> index f56c3c9a9793..a19863cac0c4 100644
> --- a/arch/sparc/mm/srmmu.c
> +++ b/arch/sparc/mm/srmmu.c
> @@ -175,18 +175,18 @@ pte_t *pte_offset_kernel(pmd_t *dir, unsigned long address)
>   */
>  static void *__srmmu_get_nocache(int size, int align)
>  {
> -       int offset;
> +       int offset, minsz = 1 << SRMMU_NOCACHE_BITMAP_SHIFT;
>         unsigned long addr;
>
> -       if (size < SRMMU_NOCACHE_BITMAP_SHIFT) {
> +       if (size < minsz) {
>                 printk(KERN_ERR "Size 0x%x too small for nocache request\n",
>                        size);
> -               size = SRMMU_NOCACHE_BITMAP_SHIFT;
> +               size = minsz;
>         }
> -       if (size & (SRMMU_NOCACHE_BITMAP_SHIFT - 1)) {
> -               printk(KERN_ERR "Size 0x%x unaligned int nocache request\n",
> +       if (size & (minsz - 1)) {
> +               printk(KERN_ERR "Size 0x%x unaligned in nocache request\n",

Was modifying the printk intentional? int vs in ?

>                        size);
> -               size += SRMMU_NOCACHE_BITMAP_SHIFT - 1;
> +               size += minsz - 1;
>         }
>         BUG_ON(align > SRMMU_NOCACHE_ALIGN_MAX);
>
> --
> 2.20.1
>


-- 
Thanks,
~Nick Desaulniers