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Message-ID: <CAOUHufZdJEidYts3ZY+=oSReWNVakVovUQsRpuxKH=ogNxqVHw@mail.gmail.com>
Date: Mon, 2 Dec 2024 15:18:35 -0700
From: Yu Zhao <yuzhao@...gle.com>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: akpm@...ux-foundation.org, kent.overstreet@...ux.dev,
pasha.tatashin@...een.com, rppt@...nel.org, souravpanda@...gle.com,
00107082@....com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
kernel test robot <oliver.sang@...el.com>
Subject: Re: [PATCH 1/2] alloc_tag: fix module allocation tags populated area calculation
On Fri, Nov 29, 2024 at 5:14 PM Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> vm_module_tags_populate() calculation of the populated area assumes that
> area starts at a page boundary and therefore when new pages are allocation,
> the end of the area is page-aligned as well. If the start of the area is
> not page-aligned then allocating a page and incrementing the end of the
> area by PAGE_SIZE leads to an area at the end but within the area boundary
> which is not populated. Accessing this are will lead to a kernel panic.
> Fix the calculation by down-aligning the start of the area and using that
> as the location allocated pages are mapped to.
>
> Fixes: 0f9b685626da ("alloc_tag: populate memory for module tags as needed")
> Reported-by: kernel test robot <oliver.sang@...el.com>
> Closes: https://lore.kernel.org/oe-lkp/202411132111.6a221562-lkp@intel.com
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
Acked-by: Yu Zhao <yuzhao@...gle.com>
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