From patchwork Wed Jul 5 06:33:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Xu X-Patchwork-Id: 115953 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:9f45:0:b0:3ea:f831:8777 with SMTP id v5csp1674408vqx; Tue, 4 Jul 2023 23:50:27 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ6lUAXKeZMpMQ26LDM1bQtzVLsp8HZFjsKsNec+yog/PqHx/9WKFVbhSRufAow+p4e9Fhxi X-Received: by 2002:a9d:6b94:0:b0:6b8:90cd:47b5 with SMTP id b20-20020a9d6b94000000b006b890cd47b5mr15718027otq.7.1688539827597; Tue, 04 Jul 2023 23:50:27 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1688539827; cv=none; d=google.com; s=arc-20160816; b=I3CPj4MFC71QcJROIMLwOmL5pqGUmVsCPO++gXFA7uqGFRrZVypm9wELYzuAMYHr1m NR6YbaIMXKYxce6b7cqe5zWtl41tTmcqDmcmCLA608M8OwvmJ3V+gt8h1IVJOZ6xYYEA Sbjpt8sdqlH72EwjGTLqfyLfCBOFa2SHYgg7gKuS3FxbZy4D0Eh/pBT8AnrejZAPjjUT B89fI8kT9KbSDXJKMEjAcVm3u/INzhWliKu+h5AD1PnShT1tpTaSM4glSCRs1DOSKTGH wl3NQ/xqziaCnvh87yNQMSSbvxY1vYpPuEi3x9wtZxhf9Ynl7vTNu+U2+Xm23ZpwgHub EGaQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=W+MSmdpLaQYcYfYw7xJr5lmjiO0vLCrOZIxlLos01I4=; fh=CDnfUUb/3IQX0KJocFBSD3kX5QcE8eCFhTYyuu68noY=; b=D7VlREfvywA9R5tUHAzQiG9ABQvyBIusx058L3LjIQcloIhR+NWooSL92p7BP/1g61 WEHVp8Ywg+WRBO6ojYupQP9sQbQEBCU+9IYPgltTDtCrw3WK4zituz5/6ed8wBIJTTRY u685LaZs9dBUJLzeCfZFYLdz29vOcLZxVxdXrFO2dncNCEKGbBzY037yOjPEgkR8a1ED /tHP30peLkHcokf2U9vFI4qeFARpYMeDc0sGOt42KBrvt3I3l/5Yra9riIF6ZNoU63rG wB4T3yEFiZQXuoO8505TfZMyDunLTU6R+RztabeY/F4WgTXCmrOosJsl2aVJn11zebDp ebHg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=bFlmbiX7; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: from out1.vger.email (out1.vger.email. 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[35.230.43.183]) by smtp.gmail.com with UTF8SMTPSA id bj2-20020a17090b088200b002633fa95ac2sm633631pjb.13.2023.07.04.23.33.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 Jul 2023 23:33:19 -0700 (PDT) From: jeffxu@chromium.org To: skhan@linuxfoundation.org, keescook@chromium.org Cc: akpm@linux-foundation.org, dmitry.torokhov@gmail.com, dverkamp@chromium.org, asmadeus@codewreck.org, hughd@google.com, jeffxu@google.com, jorgelo@chromium.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, jannh@google.com, linux-hardening@vger.kernel.org, linux-security-module@vger.kernel.org, kernel test robot Subject: [PATCH v2 1/2] mm/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED Date: Wed, 5 Jul 2023 06:33:14 +0000 Message-ID: <20230705063315.3680666-2-jeffxu@google.com> X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog In-Reply-To: <20230705063315.3680666-1-jeffxu@google.com> References: <20230705063315.3680666-1-jeffxu@google.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1770562338042617605?= X-GMAIL-MSGID: =?utf-8?q?1770562338042617605?= From: Jeff Xu When vm.memfd_noexec is 2 (MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED), memfd_create(.., MFD_EXEC) should fail. This complies with how MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED is defined - "memfd_create() without MFD_NOEXEC_SEAL will be rejected" Fixes: 105ff5339f49 ("mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC") Reported-by: Dominique Martinet Closes: https://lore.kernel.org/linux-mm/CABi2SkXUX_QqTQ10Yx9bBUGpN1wByOi_=gZU6WEy5a8MaQY3Jw@mail.gmail.com/T/ Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202306301351.kkbSegQW-lkp@intel.com/ Signed-off-by: Jeff Xu --- mm/memfd.c | 57 +++++++++++++++++++++++++++++++----------------------- 1 file changed, 33 insertions(+), 24 deletions(-) diff --git a/mm/memfd.c b/mm/memfd.c index e763e76f1106..0bdbd2335af7 100644 --- a/mm/memfd.c +++ b/mm/memfd.c @@ -268,6 +268,36 @@ long memfd_fcntl(struct file *file, unsigned int cmd, unsigned int arg) #define MFD_ALL_FLAGS (MFD_CLOEXEC | MFD_ALLOW_SEALING | MFD_HUGETLB | MFD_NOEXEC_SEAL | MFD_EXEC) +static int check_sysctl_memfd_noexec(unsigned int *flags) +{ +#ifdef CONFIG_SYSCTL + char comm[TASK_COMM_LEN]; + int sysctl = MEMFD_NOEXEC_SCOPE_EXEC; + struct pid_namespace *ns; + + ns = task_active_pid_ns(current); + if (ns) + sysctl = ns->memfd_noexec_scope; + + if (!(*flags & (MFD_EXEC | MFD_NOEXEC_SEAL))) { + if (sysctl == MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL) + *flags |= MFD_NOEXEC_SEAL; + else + *flags |= MFD_EXEC; + } + + if (*flags & MFD_EXEC && sysctl >= MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED) { + pr_warn_once( + "memfd_create(): MFD_NOEXEC_SEAL is enforced, pid=%d '%s'\n", + task_pid_nr(current), get_task_comm(comm, current)); + + return -EACCES; + } +#endif + + return 0; +} + SYSCALL_DEFINE2(memfd_create, const char __user *, uname, unsigned int, flags) @@ -294,35 +324,14 @@ SYSCALL_DEFINE2(memfd_create, return -EINVAL; if (!(flags & (MFD_EXEC | MFD_NOEXEC_SEAL))) { -#ifdef CONFIG_SYSCTL - int sysctl = MEMFD_NOEXEC_SCOPE_EXEC; - struct pid_namespace *ns; - - ns = task_active_pid_ns(current); - if (ns) - sysctl = ns->memfd_noexec_scope; - - switch (sysctl) { - case MEMFD_NOEXEC_SCOPE_EXEC: - flags |= MFD_EXEC; - break; - case MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL: - flags |= MFD_NOEXEC_SEAL; - break; - default: - pr_warn_once( - "memfd_create(): MFD_NOEXEC_SEAL is enforced, pid=%d '%s'\n", - task_pid_nr(current), get_task_comm(comm, current)); - return -EINVAL; - } -#else - flags |= MFD_EXEC; -#endif pr_warn_once( "memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=%d '%s'\n", task_pid_nr(current), get_task_comm(comm, current)); } + if (check_sysctl_memfd_noexec(&flags) < 0) + return -EACCES; + /* length includes terminating zero */ len = strnlen_user(uname, MFD_NAME_MAX_LEN + 1); if (len <= 0) From patchwork Wed Jul 5 06:33:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Xu X-Patchwork-Id: 115947 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:9f45:0:b0:3ea:f831:8777 with SMTP id v5csp1670134vqx; Tue, 4 Jul 2023 23:39:33 -0700 (PDT) X-Google-Smtp-Source: APBJJlHLKDyIcjTLYdW+TO11K/A5Fdzzy0+MzV+7SqAKhJImSsEsqMMotm4kNLwuY+iGV2um3vbJ X-Received: by 2002:a17:902:70ca:b0:1b8:a74e:56ae with SMTP id l10-20020a17090270ca00b001b8a74e56aemr1745941plt.40.1688539172857; Tue, 04 Jul 2023 23:39:32 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1688539172; cv=none; d=google.com; s=arc-20160816; b=xAbRxBpas05CE50DaLP/LJ0m2GNMXoHWmU6M4dwCozW6PP9BsTIYcE66rid3FOYa0f sgsF7pLKc63nBEbIPzWItWUcg3rCo7cTIdF8CVLDDV5ffN3VtFL4EKyoF9n1eWldHNZI m7tiafnTg7rm+DeXnSZyEkM9jk7b96JF99iEwQowp6arIywjVG2TYx59fE4bOLFRlRtW LAD+1gYbLlVnBamqja39EU+Wl5E1ejSnsTeoM/5hMaAnFXrnuoNq2J5XWwLbuwOSiSCh jkBvqd4Ms1LWF8UynWlVeyaL0ZEuWh7y+Njp5hUl4M33++j79fay9cnh9wKnPNLRKVIy rSdQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=OtlHSYlk61uE8OQ84nuywDVrRHfSI4oOT81ysMvjyFA=; fh=+wFwOUChBMDyUEg63FIGralHY9qRggLvyZTCULGydUc=; b=lJR+gKTJBsA99zJByt+Y9FXBM2wAI/Oane/LqSLe6ri81MNQg2NVB/noJGWvgUWc3b a/mpY8utMpPDySOJDw/ohVMyUPg5D3AVNxSk4Z0sVeK2QoBd/oWZOWKCMrPOTZXyik+9 Br5/givZPxX32L5NPlhKn+solAZcC95owUyp3XKyAbHe8xBfbYGqLeNt38eEMZLbjxWp cLOSZzrh4FjptupqDMn69GR+TjWDyUgzcw/v4726M4PYnhw+fuKAwZMCQCJuWAJq98uJ +wk1x3fu3jax+WLg42bFrIF7770xYcFI2BnsvYo4ABZJOyN6tg0YfWGgKK0y/o5MUkB6 Ktug== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=YwXhEKM0; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: from out1.vger.email (out1.vger.email. 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[35.230.43.183]) by smtp.gmail.com with UTF8SMTPSA id h18-20020a63f912000000b0051b36aee4f6sm17145711pgi.83.2023.07.04.23.33.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 Jul 2023 23:33:20 -0700 (PDT) From: jeffxu@chromium.org To: skhan@linuxfoundation.org, keescook@chromium.org Cc: akpm@linux-foundation.org, dmitry.torokhov@gmail.com, dverkamp@chromium.org, asmadeus@codewreck.org, hughd@google.com, jeffxu@google.com, jorgelo@chromium.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, jannh@google.com, linux-hardening@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v2 2/2] selftests/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED Date: Wed, 5 Jul 2023 06:33:15 +0000 Message-ID: <20230705063315.3680666-3-jeffxu@google.com> X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog In-Reply-To: <20230705063315.3680666-1-jeffxu@google.com> References: <20230705063315.3680666-1-jeffxu@google.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1770561651614414066?= X-GMAIL-MSGID: =?utf-8?q?1770561651614414066?= From: Jeff Xu Add selftest for sysctl vm.memfd_noexec is 2 (MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED) memfd_create(.., MFD_EXEC) should fail in this case. Reported-by: Dominique Martinet Closes: https://lore.kernel.org/linux-mm/CABi2SkXUX_QqTQ10Yx9bBUGpN1wByOi_=gZU6WEy5a8MaQY3Jw@mail.gmail.com/T/ Signed-off-by: Jeff Xu --- tools/testing/selftests/memfd/memfd_test.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/testing/selftests/memfd/memfd_test.c b/tools/testing/selftests/memfd/memfd_test.c index dba0e8ba002f..dbdd9ec5e397 100644 --- a/tools/testing/selftests/memfd/memfd_test.c +++ b/tools/testing/selftests/memfd/memfd_test.c @@ -1147,6 +1147,11 @@ static void test_sysctl_child(void) sysctl_assert_write("2"); mfd_fail_new("kern_memfd_sysctl_2", MFD_CLOEXEC | MFD_ALLOW_SEALING); + mfd_fail_new("kern_memfd_sysctl_2_MFD_EXEC", + MFD_CLOEXEC | MFD_EXEC); + fd = mfd_assert_new("", 0, MFD_NOEXEC_SEAL); + close(fd); + sysctl_fail_write("0"); sysctl_fail_write("1"); }