linux-kernel - Re: [PATCH] vmalloc: Fix remap_vmalloc

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Date:   Thu, 16 Apr 2020 15:22:24 +0200
From:   Jann Horn <jannh@...gle.com>
To:     Hillf Danton <hdanton@...a.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux-MM <linux-mm@...ck.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH] vmalloc: Fix remap_vmalloc_range() bounds checks

On Thu, Apr 16, 2020 at 7:02 AM Hillf Danton <hdanton@...a.com> wrote:
> On Thu, 16 Apr 2020 00:23:12 +0200 Jann Horn wrote:
> > remap_vmalloc_range() has had various issues with the bounds checks it
> > promises to perform ("This function checks that addr is a valid vmalloc'ed
> > area, and that it is big enough to cover the vma") over time, e.g.:
[...]
> > @@ -3082,8 +3090,10 @@ int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr,
> >       if (!(area->flags & (VM_USERMAP | VM_DMA_COHERENT)))
> >               return -EINVAL;
> >
> The current kaddr is checked valid by finding area with it despite
> there is room for adding change in checking its boundary in a valid
> area.

I have no idea what you're trying to say. Could you rephrase, please?