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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 , 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 Subject: Re: [PATCH mm-hotfixes v2 4/4] arm64: remove redundant concurrent ptdump UAF mitigation Message-ID: References: <20260712-series-vmap-race-fix-v2-0-ad134cc3a12a@kernel.org> <20260712-series-vmap-race-fix-v2-4-ad134cc3a12a@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260712-series-vmap-race-fix-v2-4-ad134cc3a12a@kernel.org> X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 9D54440011 X-Stat-Signature: 3oq11q9pnwips5iq8md6ezac8z7wqpjb X-Rspam-User: X-HE-Tag: 1783942817-840746 X-HE-Meta: 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 r1RG2cE9 LABJlMffgM4ZMYCncVm2xZSM7mBTev6LaNhmZD7JORrsnWTnBLWH4v06cJXkw8Mo9dRwCWMWubF4tKvPTiEsjU1bnErvlJtbsiYtc6Ytys3aA9mQEafn+4rItYSe8IrlFBQeWcKRtwDobQYUwmFspOQFVS9x4EfzbfbwHEAz+4Aikkl1WsbTmxIvqazdG4lxubwYNeNA1JOOk0NpuA3pa9lBEWWWjrbcP4vEWvIkH5fAxKujNTuOXYxBu1hlFPcnKhwvgc4nDuwRN2Cw8Tg1oGk4mjdysLHW01/sfO5A1rjSpZus93TFjjQrto4eMGDaeALn8fFbqGD92qJnbhEnRKR/7UQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, Jul 12, 2026 at 11:42:27AM +0100, Lorenzo Stoakes wrote: > This partially reverts commit fa93b45fd397 ("arm64: Enable vmalloc-huge > with ptdump"), retaining vmalloc-huge support but eliminating the now > redundant mitigation against a race between huge vmap page table freeing > and ptdump, as this issue has now been fixed at core. > > We also simultaneously remove the arm64 if-deffery when acquiring the mmap > read lock upon vmap huge page table promotion as it is no longer required. > > Note that this patch relies on the preceding vmalloc patch, and should not > be backported alone. > > Fixes: fa93b45fd397 ("arm64: Enable vmalloc-huge with ptdump") > Cc: stable@vger.kernel.org > Reviewed-by: Dev Jain > Acked-by: Mike Rapoport (Microsoft) > Signed-off-by: Lorenzo Stoakes > --- > arch/arm64/include/asm/ptdump.h | 2 -- > arch/arm64/mm/mmu.c | 43 ++++------------------------------------- > arch/arm64/mm/ptdump.c | 11 ++--------- > mm/vmalloc.c | 15 +++----------- > 4 files changed, 9 insertions(+), 62 deletions(-) Acked-by: Will Deacon Will