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Howlett" , Vlastimil Babka , Shakeel Butt , David Hildenbrand , Mike Rapoport , Michal Hocko , Uladzislau Rezki , Toshi Kani , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Kiryl Shutsemau , Catalin Marinas , Will Deacon , Dev Jain , Ryan Roberts , David Carlier , linux-mm@kvack.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, stable@vger.kernel.org, syzbot+fd95a72470f5a44e464c@syzkaller.appspotmail.com Subject: Re: [PATCH mm-hotfixes v3 0/4] mm: fix UAF caused by race between ptdump and vmap pgtable freeing Message-Id: <20260714121102.9cb28d080556c94d45a6bc3e@linux-foundation.org> In-Reply-To: <20260714-series-vmap-race-fix-v3-0-b812eccfa0f9@kernel.org> References: <20260714-series-vmap-race-fix-v3-0-b812eccfa0f9@kernel.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 2800E20005 X-Stat-Signature: k1ddc1grq31jzsmxx6hse4unfshhu4j7 X-HE-Tag: 1784056265-825047 X-HE-Meta: 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 YL9VIq9l 9usgQ/2iVIKZTWv8GVO2VTKorKN9JCAhcuzLR8Py9nggClzBkIz6yaFqa87OXduN38KmqFfKwENKTKFQ8JkKta3BzEE17MyRjSH+ibCiOqv67nig8ZvoLnx1yB4WWQZ3+I1akNTa492nWtMSN6+6Qcx+9IpCfnSeIV2KXpYXhiYDdYppMPOiMHq/mwiDbXI/1JmWJ6+9xV5qYSX3GUHapgS73YM9cNUMjhx94nbrtwp2OUJ0JKi9rnWe3w82NYEcxcC0qrnmw5END5cMGb09Q+o7wA+pZvacaILUbx/Vo+oNG0SbIfwq6/eiLtJN2v5d2kVNAafBvndrN0WVei1lilG7l1PXZhtkyEwUiJwHzfL1onxAyJQG4e0adgMXguFK3TGsfJfR+TQnXJvlj6d0mvcmzBQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 14 Jul 2026 18:24:22 +0100 Lorenzo Stoakes wrote: > Kernel page table walkers fall into two broad categories - those ranges > where no exclusion is required via walk_kernel_page_table_range_lockless() > and those where exclusion is required via walk_kernel_page_table_range() > or walk_page_range_debug(). > > ... > > This series works around this by #ifndef CONFIG_ARM64'ing the mmap read > lock in vmap logic, then partially reverting commit fa93b45fd397 ("arm64: > Enable vmalloc-huge with ptdump"), keeping the enablement of huge vmap > support, and removing the ifdeffery with the partial revert patch. Thanks, I've updated mm-hotfixes-unstable. > v3: > * Rebased on latest master of Linus's tree. > * Accumulated tags, thanks everybody! > * Reworded commit messages as per Kiryl and Boris. I've confirmed that v3 introduced no code alterations.