Messages in this thread Patch in this message | | | Subject | Re: [PATCH] iommu/io-pgtable-arm-v7s: Don't check PHYS_OFFSET if RAMDOMIZE_BASE is enabled | From | Yong Wu <> | Date | Thu, 13 Dec 2018 10:24:15 +0800 |
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On Wed, 2018-12-12 at 13:39 +0000, Robin Murphy wrote: > On 12/12/2018 13:02, Yong Wu wrote: > > If CONFIG_RANDOMIZE_BASE is enabled, the "memstart_addr" will be updated > > randomly, then the PHYS_OFFSET may be random. > > Oh, I hadn't ever realised that, good catch. However, since 29859aeb8a6e > I think we should probably just remove this check altogether.
Thanks the hint. It looks that I only need revert 82db33dc5e49.
> > > Fixes: 82db33dc5e49 ("iommu/io-pgtable-arm: Check for v7s-incapable > > systems") > > Note that this alone wouldn't be sufficient for stable prior to 4.18, > since CONFIG_RANDOMIZE_BASE would then allow the original crash to > happen again.
Yes. the problem always exist. Nicolas is fixing this. I will delete the tag here.
> > Robin. > > > Reported-by: CK Hu <ck.hu@mediatek.com> > > Signed-off-by: Yong Wu <yong.wu@mediatek.com> > > --- > > drivers/iommu/io-pgtable-arm-v7s.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c > > index 445c3bd..70941e6 100644 > > --- a/drivers/iommu/io-pgtable-arm-v7s.c > > +++ b/drivers/iommu/io-pgtable-arm-v7s.c > > @@ -709,7 +709,7 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg, > > { > > struct arm_v7s_io_pgtable *data; > > > > -#ifdef PHYS_OFFSET > > +#if defined(PHYS_OFFSET) && !defined(CONFIG_RANDOMIZE_BASE) > > if (upper_32_bits(PHYS_OFFSET)) > > return NULL; > > #endif > > > > _______________________________________________ > Linux-mediatek mailing list > Linux-mediatek@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-mediatek
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