From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Yeoreum Yun <yeoreum.yun@arm.com>,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org, ljs@kernel.org, liam@infradead.org,
vbabka@kernel.org, rppt@kernel.org, surenb@google.com,
mhocko@suse.com
Subject: Re: [PATCH v2] kselftest: mm: fix potential failure for merged VMA in guard-regions
Date: Fri, 11 Sep 2026 17:02:20 +0200 [thread overview]
Message-ID: <62160d6e-5409-4249-814b-cdc33b7d29df@kernel.org> (raw)
In-Reply-To: <20260911142904.1825452-1-yeoreum.yun@arm.com>
On 9/11/26 16:29, Yeoreum Yun wrote:
> check_vmflag_guard() uses /proc/self/smaps to retrieve the VMA flags,
> but this can fail if the mapping is merged with an adjacent VMA.
>
> To avoid this potential failure, first allocate a temporary region with
> extra pages at both ends, unmap it, and then map the test region within
> the temporary address range, leaving an unmapped page on each side to
> prevent VMA merging.
>
> Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
> ---
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
--
Cheers,
David
prev parent reply other threads:[~2026-09-11 15:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-11 14:29 [PATCH v2] kselftest: mm: fix potential failure for merged VMA in guard-regions Yeoreum Yun
2026-09-11 14:58 ` Lorenzo Stoakes (ARM)
2026-09-11 15:02 ` David Hildenbrand (Arm) [this message]
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