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Howlett" To: Linus Torvalds Cc: Jeff Xu , Jeff Xu , Jonathan Corbet , akpm@linux-foundation.org, keescook@chromium.org, jannh@google.com, sroettger@google.com, willy@infradead.org, gregkh@linuxfoundation.org, usama.anjum@collabora.com, rdunlap@infradead.org, jorgelo@chromium.org, groeck@chromium.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, pedro.falcato@gmail.com, dave.hansen@intel.com, linux-hardening@vger.kernel.org Subject: Re: [PATCH v8 0/4] Introduce mseal Message-ID: <20240202211807.6sca4ppezma7cyev@revolver> Mail-Followup-To: "Liam R. 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 w6cn/a6c 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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: * Linus Torvalds [240202 15:37]: > On Fri, 2 Feb 2024 at 11:32, Theo de Raadt wrote: > > > > Unix system calls must be atomic. > > > > They either return an error, and that is a promise they made no changes. > > That's actually not true, and never has been. ... > > In the specific case of mseal(), I suspect there are very few reasons > ever *not* to be atomic, so in this particular context atomicity is > likely always something that should be guaranteed. But I just wanted > to point out that it's most definitely not a black-and-white issue in > the general case. There will be a larger performance cost to checking up front without allowing the partial completion. I don't expect these to be high, but it's something to keep in mind if we are okay with the flexibility and less atomic operation. Thanks, Liam