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linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev, Ihor Solodrai , Bert Karwatzki References: <20261009-b4-mmap-prepare-vma-flag-sanify-v5-0-923b70125b1e@kernel.org> <20261009-b4-mmap-prepare-vma-flag-sanify-v5-11-923b70125b1e@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv 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UFQiGckAClGECv+WozVtRGylHQaOEi1mxDLkl6mJNnTSThlZIC08wHrG1KcO0xENRvgrXvgLDGNV0b665ZCGDdS4+Stv/Cmz951n2+NuvyIAUYJtRcSX/p2W2+iC+xp/KzwzaLqhX5tPfaeThXfa0ghkeuBYzxkUstZpYC9flfJcKb1VNoRojbwsLq7IJGg21uK4yDvQtvuVz6l8DIV+LSJNsgtXPtHajCuIo/9/fWtorc+3LgcCFAytsYoDgLpiUrH/+72EzaaH9sIMl8FDmkMjyTNJC9ixRlwzfTJNU9iHgXngMb3tMQ+kePEos7HIRBU9MwcAoXUCiubO/WNLzPfGe0Q3yxsmNL3kpLIOPzMna8ZtGB5Gs3IBJBylvzVsG4uWXMFXaqmalbWXNkBWkiT4YEoH72FoYlqjRUGmasOiQgCwwo4M4j Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/9/26 20:04, Lorenzo Stoakes (ARM) wrote: > The policy file has no write method and is exposed read-only (S_IRUGO in > selinux_files[]), yet sel_open_policy() performs no open mode check, so a > CAP_DAC_OVERRIDE caller can open it O_RDWR. Reject FMODE_WRITE at open, as > kernfs does. > > The file can then never be mapped with FMODE_WRITE, so do_mmap() always > clears VM_MAYWRITE and VM_SHARED for MAP_SHARED mappings and the VM_SHARED > check in sel_mmap_policy() cannot be reached. Remove it. > > This also stops sel_mmap_policy() clearing VM_MAYWRITE on a mapping that is > neither a PFN map nor a mixed map, ahead of the core enforcing that only > such mappings may do so. > > Acked-by: Stephen Smalley > Reviewed-by: Jann Horn > Acked-by: Paul Moore > Reviewed-by: Suren Baghdasaryan > Signed-off-by: Lorenzo Stoakes (ARM) > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David