From: Peter Xu <peterx@redhat.com>
To: Axel Rasmussen <axelrasmussen@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Brian Geffon <bgeffon@google.com>,
Christian Brauner <brauner@kernel.org>,
David Hildenbrand <david@redhat.com>,
Gaosheng Cui <cuigaosheng1@huawei.com>,
Huang Ying <ying.huang@intel.com>,
Hugh Dickins <hughd@google.com>,
James Houghton <jthoughton@google.com>,
"Jan Alexander Steffens (heftig)" <heftig@archlinux.org>,
Jiaqi Yan <jiaqiyan@google.com>, Jonathan Corbet <corbet@lwn.net>,
Kefeng Wang <wangkefeng.wang@huawei.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Miaohe Lin <linmiaohe@huawei.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
"Mike Rapoport (IBM)" <rppt@kernel.org>,
Muchun Song <muchun.song@linux.dev>,
Nadav Amit <namit@vmware.com>,
Naoya Horiguchi <naoya.horiguchi@nec.com>,
Ryan Roberts <ryan.roberts@arm.com>,
Shuah Khan <shuah@kernel.org>,
Suleiman Souhlal <suleiman@google.com>,
Suren Baghdasaryan <surenb@google.com>,
"T.J. Alumbaugh" <talumbau@google.com>,
Yu Zhao <yuzhao@google.com>, ZhangPeng <zhangpeng362@huawei.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v3 2/8] mm: userfaultfd: check for start + len overflow in validate_range
Date: Fri, 7 Jul 2023 09:14:14 -0400 [thread overview]
Message-ID: <ZKgPpkx0l7mZ6s5E@x1n> (raw)
In-Reply-To: <20230706225037.1164380-3-axelrasmussen@google.com>
On Thu, Jul 06, 2023 at 03:50:30PM -0700, Axel Rasmussen wrote:
> Most userfaultfd ioctls take a `start + len` range as an argument.
> We have the validate_range helper to check that such ranges are valid.
> However, some (but not all!) ioctls *also* check that `start + len`
> doesn't wrap around (overflow).
>
> Just check for this in validate_range. This saves some repetitive code,
> and adds the check to some ioctls which weren't bothering to check for
> it before.
>
> Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
--
Peter Xu
next prev parent reply other threads:[~2023-07-07 13:15 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-06 22:50 [PATCH v3 0/8] add UFFDIO_POISON to simulate memory poisoning with UFFD Axel Rasmussen
2023-07-06 22:50 ` [PATCH v3 1/8] mm: make PTE_MARKER_SWAPIN_ERROR more general Axel Rasmussen
2023-07-07 13:10 ` Peter Xu
2023-07-06 22:50 ` [PATCH v3 2/8] mm: userfaultfd: check for start + len overflow in validate_range Axel Rasmussen
2023-07-07 13:14 ` Peter Xu [this message]
2023-07-06 22:50 ` [PATCH v3 3/8] mm: userfaultfd: extract file size check out into a helper Axel Rasmussen
2023-07-07 13:15 ` Peter Xu
2023-07-06 22:50 ` [PATCH v3 4/8] mm: userfaultfd: add new UFFDIO_POISON ioctl Axel Rasmussen
2023-07-07 13:37 ` Peter Xu
2023-07-07 19:56 ` Axel Rasmussen
2023-07-06 22:50 ` [PATCH v3 5/8] mm: userfaultfd: support UFFDIO_POISON for hugetlbfs Axel Rasmussen
2023-07-07 13:39 ` Peter Xu
2023-07-06 22:50 ` [PATCH v3 6/8] mm: userfaultfd: document and enable new UFFDIO_POISON feature Axel Rasmussen
2023-07-06 22:50 ` [PATCH v3 7/8] selftests/mm: refactor uffd_poll_thread to allow custom fault handlers Axel Rasmussen
2023-07-07 13:42 ` Peter Xu
2023-07-07 17:03 ` Axel Rasmussen
2023-07-07 20:38 ` Axel Rasmussen
2023-07-07 21:00 ` Peter Xu
2023-07-06 22:50 ` [PATCH v3 8/8] selftests/mm: add uffd unit test for UFFDIO_POISON Axel Rasmussen
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