Messages in this thread | | | Date | Thu, 24 May 2018 11:27:38 +0100 | From | Will Deacon <> | Subject | Re: [PATCHv2] arm64: Make sure permission updates happen for pmd/pud |
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Hi Laura,
On Wed, May 23, 2018 at 11:43:46AM -0700, Laura Abbott wrote: > Commit 15122ee2c515 ("arm64: Enforce BBM for huge IO/VMAP mappings") > disallowed block mappings for ioremap since that code does not honor > break-before-make. The same APIs are also used for permission updating > though and the extra checks prevent the permission updates from happening, > even though this should be permitted. This results in read-only permissions > not being fully applied. Visibly, this can occasionaly be seen as a failure > on the built in rodata test when the test data ends up in a section or > as an odd RW gap on the page table dump. Fix this by using > pgattr_change_is_safe instead of p*d_present for determining if the > change is permitted. > > Reported-by: Peter Robinson <pbrobinson@gmail.com> > Fixes: 15122ee2c515 ("arm64: Enforce BBM for huge IO/VMAP mappings") > Signed-off-by: Laura Abbott <labbott@redhat.com> > --- > v2: Switch to using pgattr_change_is_safe per suggestion of Will > ---
Thanks for re-spinning so quickly. I'll queue as a fix with the relevant tags.
Will
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