Messages in this thread | | | Date | Thu, 26 Mar 2020 11:33:49 +0000 | From | Catalin Marinas <> | Subject | Re: [PATCH] mm/mremap: Add comment explaining the untagging behaviour of mremap() |
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On Wed, Mar 25, 2020 at 11:13:46AM +0000, Will Deacon wrote: > Commit dcde237319e6 ("mm: Avoid creating virtual address aliases in > brk()/mmap()/mremap()") changed mremap() so that only the 'old' address > is untagged, leaving the 'new' address in the form it was passed from > userspace. This prevents the unexpected creation of aliasing virtual > mappings in userspace, but looks a bit odd when you read the code. > > Add a comment justifying the untagging behaviour in mremap(). > > Cc: Catalin Marinas <catalin.marinas@arm.com> > Reported-by: Linus Torvalds <torvalds@linux-foundation.org> > Signed-off-by: Will Deacon <will@kernel.org>
I queued this patch via the arm64 tree (for 5.7-rc1). Thanks.
-- Catalin
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