From patchwork Fri Jun 30 03:17:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Xu X-Patchwork-Id: 114541 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp10070995vqr; Thu, 29 Jun 2023 20:20:53 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ5R4pV5gfmMabsr0bRo14YkEG6dJS7+vXlzpMCFek1XVpdEYnIl1oiad9/iJtfLIL3m5f40 X-Received: by 2002:a05:6a20:8e08:b0:121:84ce:c629 with SMTP id y8-20020a056a208e0800b0012184cec629mr2290358pzj.0.1688095253648; Thu, 29 Jun 2023 20:20:53 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1688095253; cv=none; d=google.com; s=arc-20160816; b=Ypv70MF39rVg2LI/5KSeFU88hwSq55o3m7ldUCYxCJd77Zu3eWU5OKkPnuRwwFrXb8 xYMGdaQsvWAahzI1UPpzS09YyMzPb9UIfJMoH3QSDBRrq0azZWQyMZkmsUsA8eJDfdNV 9fxRZoN7yKCiPfrfhKm5qjgqo0SbSzJu8YbT8cZpRHIQxIXEUK7X1vCJQ/C1nT6zcUYe sOtqtPohzXWB05xs1RyyDtmG74nuMgPpxalfKsNsAIpH6rkTlm3acdamEiLDLQf1vTYU Wy3KcUJx28ihpVKEFGpmvk9cGw9qFUgetoZOdshvew40NWDgcT3j9V8Bbq15LRONLnrR lfUA== 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=53ZMdGhNmZ+BOpMUbgSFLyEDTkK0ZHteXsorexZvGcc=; fh=+wFwOUChBMDyUEg63FIGralHY9qRggLvyZTCULGydUc=; b=T7oiHa6oOLH5Fs1kyTlrQxEAyekY0zGI5TRz/ZPR34xp3q/Vjr4kGP8qGhFdftN+uD Nn6SNLQ2mbNHpSRshl19vQiVlXHvB6av3q1HI/1FeIeVAvxws2RjH04szPcA33YoaNj7 zJ3/iCeO3cVjFpigVJyRNInrPZBls8pRAt6N+zO45yImACGpVwnX9uJ2Xxooi/ikQSOa akGigN8mlhpd548+eHbfXH785/V1iKYbh+uwZx4a9Sm7v3Lnvq11ARry1lMANbfWmc+k d9UVKPNDteR0zYnZ7jb33LS1fT6MHZ1ivhQ2QHLGVzLSCKPNShoSEkYINiLNCeDmQzG5 iHNA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=Hhds97GU; 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 x24-20020aa784d8000000b0065438394fa4sm1622577pfn.90.2023.06.29.20.17.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 29 Jun 2023 20:17:29 -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 v1 1/2] mm/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED Date: Fri, 30 Jun 2023 03:17:19 +0000 Message-ID: <20230630031721.623955-2-jeffxu@google.com> X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog In-Reply-To: <20230630031721.623955-1-jeffxu@google.com> References: <20230630031721.623955-1-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=ham 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?1770096168802892596?= X-GMAIL-MSGID: =?utf-8?q?1770096168802892596?= 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" Link:https://lore.kernel.org/linux-mm/CABi2SkXUX_QqTQ10Yx9bBUGpN1wByOi_=gZU6WEy5a8MaQY3Jw@mail.gmail.com/T/ Fixes: 105ff5339f49 ("mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC") Reported-by: Dominique Martinet Signed-off-by: Jeff Xu --- mm/memfd.c | 48 +++++++++++++++++++++++++----------------------- 1 file changed, 25 insertions(+), 23 deletions(-) diff --git a/mm/memfd.c b/mm/memfd.c index e763e76f1106..812750298e8a 100644 --- a/mm/memfd.c +++ b/mm/memfd.c @@ -268,6 +268,19 @@ 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 sysctl_memfd_noexec(void) +{ + int sysctl = MEMFD_NOEXEC_SCOPE_EXEC; +#ifdef CONFIG_SYSCTL + struct pid_namespace *ns; + + ns = task_active_pid_ns(current); + if (ns) + sysctl = ns->memfd_noexec_scope; +#endif + return sysctl; +} + SYSCALL_DEFINE2(memfd_create, const char __user *, uname, unsigned int, flags) @@ -278,6 +291,7 @@ SYSCALL_DEFINE2(memfd_create, int fd, error; char *name; long len; + int sysctl = sysctl_memfd_noexec(); if (!(flags & MFD_HUGETLB)) { if (flags & ~(unsigned int)MFD_ALL_FLAGS) @@ -294,35 +308,23 @@ 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: + if (sysctl == 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 + else + flags |= MFD_EXEC; + 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 (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; + } + /* length includes terminating zero */ len = strnlen_user(uname, MFD_NAME_MAX_LEN + 1); if (len <= 0) From patchwork Fri Jun 30 03:17:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Xu X-Patchwork-Id: 114542 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp10073504vqr; Thu, 29 Jun 2023 20:27:57 -0700 (PDT) X-Google-Smtp-Source: APBJJlGKiw/wKz9jKgZfUL811dRWxB0SDxBYkaD967mtpp8KYrCqDIxjwBVvjl44+gExlRJtR70n X-Received: by 2002:a17:90b:890:b0:262:e6a9:bf1 with SMTP id bj16-20020a17090b089000b00262e6a90bf1mr1376505pjb.1.1688095677356; Thu, 29 Jun 2023 20:27:57 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1688095677; cv=none; d=google.com; s=arc-20160816; b=up7gXP3AQsseQ2ETi0jVInGFVWX2U4qXtsJT6wOdrakOtXV1P54rwXCdH80gHMW85Y CmF6lcedMDZpLDUk/3ibMIBihpUdcVOEUAh629PM9msOWm5U27yRYUBk3uMeCEAc/+vy k6PY8czqr3Dbm1g4JOEIBYL3kV86pR2bwm430yrplgTeigzOqOLYnG1fDzTtZIUMtFQF Vk/NmIRkuwwHVvuBgemUFcE7kIyTIbnB4ddgLlp82L/qVVh9IuVygW9L1HpRW9PEQ1mf 82+hHkwCQRjlc+OeQK9tA3WCOGmUoyKIbh4+9LrzbRCf1saRrhYQxgZiEfe9AqG4H+Zv HIbA== 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=KZoSuQHQ27DM/d6b7OOglRkF4w/BysG+jSVaxzCus5g=; fh=+wFwOUChBMDyUEg63FIGralHY9qRggLvyZTCULGydUc=; b=mBFBxj8K2r5HYzBJ/PTIZxiSspdFu51Oxb6xocEgFUH/aktOtHbqPCFfUKMcE3ftpl 9bI+TFPA5YNdparVgbA9ZyiunMRfwOC4E2/3nqYAZdJeo0qdPrhumgBP9Ob2U3VHHTRQ FnLBUTdt4/4Z3ccQ6L1yb2vJVYJmNfIgaJWZivySVTRCfHt2r9/d1fAb7r9NglExMC88 ycQyX8DMbUZeZPL2c8wDAcFRa37vvqCYBgBm1V7MXGifgIi6qOgWPQJ2Y50oiZS12mQ9 mrC3suyk3kNq3zcN2q8Zk20maokXj5L9kcL3opshmC/pHSc/0Z5N7PDNSZdTLqwWyQOe +Aiw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=HeDRz1ER; 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 y12-20020a655b4c000000b0055adf339c35sm6407088pgr.31.2023.06.29.20.17.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 29 Jun 2023 20:17:32 -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 v1 2/2] selftests/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED Date: Fri, 30 Jun 2023 03:17:20 +0000 Message-ID: <20230630031721.623955-3-jeffxu@google.com> X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog In-Reply-To: <20230630031721.623955-1-jeffxu@google.com> References: <20230630031721.623955-1-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=ham 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?1770096612847325144?= X-GMAIL-MSGID: =?utf-8?q?1770096612847325144?= 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. 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"); }