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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 v3 16/16] mm: on remap assert that input range within the proposed VMA Date: Thu, 19 Mar 2026 18:23:40 +0000 Message-ID: X-Mailer: git-send-email 2.53.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: rz1d4qozp5nnkqf39w81froj1pcmmnj4 X-Rspamd-Server: rspam09 X-Rspam-User: X-Rspamd-Queue-Id: 8C4ED4000E X-HE-Tag: 1773944672-401231 X-HE-Meta: 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 PNfm2GXe 2DAAIBPhbYM6Ntlt5Ib22AkvIi5Qv7PTkfs3F0uuZBmiZASfILyp+XPU1Maqlvt0IQ9ZmYb++83RcHpXMZgVv6j1wPOtJWlA4N2P5VQuqmdaCmACxnQchlXI5I7pV4sTslR1c2UbV+aXMAxh421cIGI3EASYmxdadEDlytOg+j3mzMeHYgmaa5n5N7J5NEx3R74PLzXZPEKdrUq4hXBRC4aBsVT3P9gGziUO0zsqFlUZdxGfUiO8cKTXy91d2r31PdlhTJA6gYyJE2/fvVLOZ6YDvw77lDdoXpbp33NE1Ufj3zTcWRICeCogGHHlmKXrzOD2hz5X4hedDmwI= 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