Messages in this thread | | | From | Peter Collingbourne <> | Date | Mon, 2 Aug 2021 13:10:47 -0700 | Subject | Re: [PATCH 5.13 191/223] selftest: use mmap instead of posix_memalign to allocate memory |
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On Thu, Jul 29, 2021 at 9:38 PM Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote: > > On Thu, Jul 29, 2021 at 10:58:11AM -0700, Peter Collingbourne wrote: > > On Mon, Jul 26, 2021 at 9:16 AM Greg Kroah-Hartman > > <gregkh@linuxfoundation.org> wrote: > > > > > > From: Peter Collingbourne <pcc@google.com> > > > > > > commit 0db282ba2c12c1515d490d14a1ff696643ab0f1b upstream. > > > > > > This test passes pointers obtained from anon_allocate_area to the > > > userfaultfd and mremap APIs. This causes a problem if the system > > > allocator returns tagged pointers because with the tagged address ABI > > > the kernel rejects tagged addresses passed to these APIs, which would > > > end up causing the test to fail. To make this test compatible with such > > > system allocators, stop using the system allocator to allocate memory in > > > anon_allocate_area, and instead just use mmap. > > > > > > Link: https://lkml.kernel.org/r/20210714195437.118982-3-pcc@google.com > > > Link: https://linux-review.googlesource.com/id/Icac91064fcd923f77a83e8e133f8631c5b8fc241 > > > Fixes: c47174fc362a ("userfaultfd: selftest") > > > Co-developed-by: Lokesh Gidra <lokeshgidra@google.com> > > > Signed-off-by: Lokesh Gidra <lokeshgidra@google.com> > > > Signed-off-by: Peter Collingbourne <pcc@google.com> > > > Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> > > > Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> > > > Cc: Dave Martin <Dave.Martin@arm.com> > > > Cc: Will Deacon <will@kernel.org> > > > Cc: Andrea Arcangeli <aarcange@redhat.com> > > > Cc: Alistair Delva <adelva@google.com> > > > Cc: William McVicker <willmcvicker@google.com> > > > Cc: Evgenii Stepanov <eugenis@google.com> > > > Cc: Mitch Phillips <mitchp@google.com> > > > Cc: Andrey Konovalov <andreyknvl@gmail.com> > > > Cc: <stable@vger.kernel.org> [5.4] > > > Signed-off-by: Andrew Morton <akpm@linux-foundation.org> > > > Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> > > > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > > --- > > > tools/testing/selftests/vm/userfaultfd.c | 6 ++++-- > > > 1 file changed, 4 insertions(+), 2 deletions(-) > > > > > > --- a/tools/testing/selftests/vm/userfaultfd.c > > > +++ b/tools/testing/selftests/vm/userfaultfd.c > > > @@ -197,8 +197,10 @@ static int anon_release_pages(char *rel_ > > > > > > static void anon_allocate_area(void **alloc_area) > > > { > > > - if (posix_memalign(alloc_area, page_size, nr_pages * page_size)) { > > > - fprintf(stderr, "out of memory\n"); > > > + *alloc_area = mmap(NULL, nr_pages * page_size, PROT_READ | PROT_WRITE, > > > + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); > > > + if (*alloc_area == MAP_FAILED) > > > > Hi Greg, > > > > It looks like your backport of this patch (and the backports to stable > > kernels) are missing a left brace here. > > Already fixed up in the latest -rc releases, right?
It looks like you fixed it on linux-4.19.y and linux-5.4.y, but not linux-4.14.y, linux-5.10.y or linux-5.13.y.
Peter
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