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Howlett" To: Lorenzo Stoakes Cc: stable@vger.kernel.org, Andrew Morton , Vlastimil Babka , Jann Horn , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linus Torvalds , Peter Xu , Catalin Marinas , Will Deacon , Mark Brown , "David S . Miller" , Andreas Larsson , "James E . J . Bottomley" , Helge Deller Subject: Re: [PATCH 6.1.y 0/4] fix error handling in mmap_region() and refactor (hotfixes) Message-ID: Mail-Followup-To: "Liam R. Howlett" , Lorenzo Stoakes , stable@vger.kernel.org, Andrew Morton , Vlastimil Babka , Jann Horn , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linus Torvalds , Peter Xu , Catalin Marinas , Will Deacon , Mark Brown , "David S . Miller" , Andreas Larsson , "James E . J . 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 4AquQWCv 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: * Lorenzo Stoakes [241115 07:40]: > Critical fixes for mmap_region(), backported to 6.1.y. > > Some notes on differences from upstream: > > * We do NOT take commit 0fb4a7ad270b ("mm: refactor > map_deny_write_exec()"), as this refactors code only introduced in 6.2. > > * We make reference in "mm: refactor arch_calc_vm_flag_bits() and arm64 MTE > handling" to parisc, but the referenced functionality does not exist in > this kernel. > > * In this kernel is_shared_maywrite() does not exist and the code uses > VM_SHARED to determine whether mapping_map_writable() / > mapping_unmap_writable() should be invoked. This backport therefore > follows suit. > > * The vma_dummy_vm_ops static global doesn't exist in this kernel, so we > use a local static variable in mmap_file() and vma_close(). > > * Each version of these series is confronted by a slightly different > mmap_region(), so we must adapt the change for each stable version. The > approach remains the same throughout, however, and we correctly avoid > closing the VMA part way through any __mmap_region() operation. > > * This version of the kernel uses mas_preallocate() rather than the > vma_iter_prealloc() wrapper and mas_destroy() rather than the > vma_iter_free() wrapper, however the logic of rearranging the positioning > of these remains the same, as well as avoiding the iterator leak we > previously had on some error paths. > Besides that one line fix (thanks Vlastimil!), these look good. Reviewed-by: Liam R. Howlett > Lorenzo Stoakes (4): > mm: avoid unsafe VMA hook invocation when error arises on mmap hook > mm: unconditionally close VMAs on error > mm: refactor arch_calc_vm_flag_bits() and arm64 MTE handling > mm: resolve faulty mmap_region() error path behaviour > > arch/arm64/include/asm/mman.h | 10 ++- > include/linux/mman.h | 7 +- > mm/internal.h | 19 ++++++ > mm/mmap.c | 119 ++++++++++++++++++---------------- > mm/nommu.c | 9 ++- > mm/shmem.c | 3 - > mm/util.c | 33 ++++++++++ > 7 files changed, 129 insertions(+), 71 deletions(-) > > -- > 2.47.0