From: Catalin Marinas <catalin.marinas@arm•com>
To: Peter Collingbourne <pcc@google•com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm•com>,
Dave Martin <Dave.Martin@arm•com>, Will Deacon <will@kernel•org>,
Andrew Morton <akpm@linux-foundation•org>,
Andrea Arcangeli <aarcange@redhat•com>,
Alistair Delva <adelva@google•com>,
Lokesh Gidra <lokeshgidra@google•com>,
William McVicker <willmcvicker@google•com>,
Evgenii Stepanov <eugenis@google•com>,
Mitch Phillips <mitchp@google•com>,
Linux ARM <linux-arm-kernel@lists•infradead.org>,
linux-mm@kvack•org, Andrey Konovalov <andreyknvl@gmail•com>,
stable@vger•kernel.org
Subject: Re: [PATCH v4 2/2] selftest: use mmap instead of posix_memalign to allocate memory
Date: Thu, 8 Jul 2021 13:59:19 +0100 [thread overview]
Message-ID: <20210708125919.GB9966@arm.com> (raw)
In-Reply-To: <20210707184313.3697385-3-pcc@google.com>
On Wed, Jul 07, 2021 at 11:43:13AM -0700, Peter Collingbourne wrote:
> 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.
>
> Co-developed-by: Lokesh Gidra <lokeshgidra@google•com>
> Signed-off-by: Lokesh Gidra <lokeshgidra@google•com>
> Signed-off-by: Peter Collingbourne <pcc@google•com>
> Fixes: c47174fc362a ("userfaultfd: selftest")
> Cc: <stable@vger•kernel.org> # 5.4
> Link: https://linux-review.googlesource.com/id/Icac91064fcd923f77a83e8e133f8631c5b8fc241
Reviewed-by: Catalin Marinas <catalin.marinas@arm•com>
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next prev parent reply other threads:[~2021-07-08 13:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 18:43 [PATCH v4 0/2] userfaultfd: do not untag user pointers Peter Collingbourne
2021-07-07 18:43 ` [PATCH v4 1/2] " Peter Collingbourne
2021-07-08 12:58 ` Catalin Marinas
2021-07-07 18:43 ` [PATCH v4 2/2] selftest: use mmap instead of posix_memalign to allocate memory Peter Collingbourne
2021-07-08 12:59 ` Catalin Marinas [this message]
2021-07-09 23:27 ` Andrew Morton
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