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Y . Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Alexander Shishkin , Maxime Coquelin , Alexandre Torgue , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Bodo Stroesser , "Martin K . Petersen" , David Howells , Marc Dionne , Alexander Viro , Christian Brauner , Jan Kara , David Hildenbrand , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-mtd@lists.infradead.org, linux-staging@lists.linux.dev, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-afs@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Ryan Roberts Subject: [PATCH v4 21/21] mm: on remap assert that input range within the proposed VMA Date: Fri, 20 Mar 2026 22:39:47 +0000 Message-ID: <0fc1092f4b74f3f673a58e4e3942dc83f336dd85.1774045440.git.ljs@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 0FCAD14000F X-Rspamd-Server: rspam07 X-Stat-Signature: 8pd6qonrj3x6nd467h7dkh4tzskj7y9w X-Rspam-User: X-HE-Tag: 1774046465-346535 X-HE-Meta: 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 koBHiWCX CxQsM6wsa2tOyNbDktxnh0q2jz/x0mTtBwvhHN3pVOIMx4Cwzj/UEsOR+qpNoneHdR+p95Q1AgPDTz85ov+ZopwmjbFhj6o/5OtQ1T2wSEnEEl2am6DygDOo5ml7Sy0WOriw98Ku5tfe/BGbWEbujwrPRD8KmigV9Ts0DE3Hodr98br5U6PCei/KTYZpzY6+f9LPCCxlVnJ8K9cxX9r+WP6F/SM0bPlHLFG8V0FwQbRkukf5skh5eHqpsH1959GOlM1vUq/x8PJPgAoSi603yu+qAlLGq864xzV4S Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Now we have range_in_vma_desc(), update remap_pfn_range_prepare() to check whether the input range in contained within the specified VMA, so we can fail at prepare time if an invalid range is specified. This covers the I/O remap mmap actions also which ultimately call into this function, and other mmap action types either already span the full VMA or check this already. Reviewed-by: Suren Baghdasaryan Signed-off-by: Lorenzo Stoakes (Oracle) --- mm/memory.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/memory.c b/mm/memory.c index 53ef8ef3d04a..68cc592ff0ba 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3142,6 +3142,9 @@ int remap_pfn_range_prepare(struct vm_area_desc *desc) const bool is_cow = vma_desc_is_cow_mapping(desc); int err; + if (!range_in_vma_desc(desc, start, end)) + return -EFAULT; + err = get_remap_pgoff(is_cow, start, end, desc->start, desc->end, pfn, &desc->pgoff); if (err) -- 2.53.0