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[34.168.184.9]) by smtp.gmail.com with UTF8SMTPSA id jn21-20020a170903051500b001c726147a45sm8599282plb.190.2023.10.16.07.39.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Oct 2023 07:39:02 -0700 (PDT) From: jeffxu@chromium.org To: akpm@linux-foundation.org, keescook@chromium.org, sroettger@google.com Cc: jeffxu@google.com, jorgelo@chromium.org, groeck@chromium.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, jannh@google.com, surenb@google.com, alex.sierra@amd.com, apopple@nvidia.com, aneesh.kumar@linux.ibm.com, axelrasmussen@google.com, ben@decadent.org.uk, catalin.marinas@arm.com, david@redhat.com, dwmw@amazon.co.uk, ying.huang@intel.com, hughd@google.com, joey.gouly@arm.com, corbet@lwn.net, wangkefeng.wang@huawei.com, Liam.Howlett@oracle.com, torvalds@linux-foundation.org, lstoakes@gmail.com, willy@infradead.org, mawupeng1@huawei.com, linmiaohe@huawei.com, namit@vmware.com, peterx@redhat.com, peterz@infradead.org, ryan.roberts@arm.com, shr@devkernel.io, vbabka@suse.cz, xiujianfeng@huawei.com, yu.ma@intel.com, zhangpeng362@huawei.com, dave.hansen@intel.com, luto@kernel.org, linux-hardening@vger.kernel.org Subject: [RFC PATCH v1 4/8] mseal: seal mprotect Date: Mon, 16 Oct 2023 14:38:23 +0000 Message-ID: <20231016143828.647848-5-jeffxu@chromium.org> X-Mailer: git-send-email 2.42.0.655.g421f12c284-goog In-Reply-To: <20231016143828.647848-1-jeffxu@chromium.org> References: <20231016143828.647848-1-jeffxu@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Mon, 16 Oct 2023 07:39:49 -0700 (PDT) From: Jeff Xu check sealing for mprotect(2). Signed-off-by: Jeff Xu --- mm/mprotect.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/mprotect.c b/mm/mprotect.c index 130db91d3a8c..5b67c66d55f7 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -753,6 +753,12 @@ static int do_mprotect_pkey(unsigned long start, size_t len, } } + if (!can_modify_mm(current->mm, start, end, MM_ACTION_MPROTECT, + ON_BEHALF_OF_USERSPACE)) { + error = -EACCES; + goto out; + } + prev = vma_prev(&vmi); if (start > vma->vm_start) prev = vma; -- 2.42.0.609.gbb76f46606-goog