Re: [PATCH] ovl: fix mmap denywrite

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On Tue, 22 Jun 2021 at 14:43, Christian König <christian.koenig@xxxxxxx> wrote:
>
> Am 22.06.21 um 14:30 schrieb Miklos Szeredi:
> > Overlayfs did not honor positive i_writecount on realfile for VM_DENYWRITE
> > mappings.  Similarly negative i_mmap_writable counts were ignored for
> > VM_SHARED mappings.
> >
> > Fix by making vma_set_file() switch the temporary counts obtained and
> > released by mmap_region().
>
> Mhm, I don't fully understand the background but that looks like
> something specific to overlayfs to me.
>
> So why are you changing the common helper?

Need to hold the temporary counts until the final ones are obtained in
vma_link(), which is out of overlayfs' scope.

Thanks,
Miklos




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