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Before introduction of ROX cache execmem allocation size was always
implicitly aligned to PAGE_SIZE inside vmalloc.
However, when allocation happens from the ROX cache, this is not
enforced.
Make sure that the allocation size is always consistently aligned to
PAGE_SIZE.
Mike said:
: Right now it'll make the maple trees in execmem_cache more compact.
: And it's a precaution for the case when execmem callers would want to
: change permissions on unaligned range because that would WARN_ON()
: loudly.
Peter said
: It should not have a runtime effect -- currently all this code is used
: with PAGE_SIZE multiples and everything just works. But whilst I was
: perusing this code, I noticed that nothing actually enforced this. If
: someone were to break this assumption things will go sideways.
Link: https://lkml.kernel.org/r/20250423144808.1619863-1-rppt@kernel.org
Fixes: 2e45474ab1 ("execmem: add support for cache of large ROX pages")
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
494 lines
11 KiB
494 lines
11 KiB