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Shutemov" X-Google-Original-From: "Kirill A. Shutemov" Received: by box.localdomain (Postfix, from userid 1000) id 957D31048AB; Wed, 31 Jul 2019 18:08:17 +0300 (+03) To: Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , David Howells Cc: Kees Cook , Dave Hansen , Kai Huang , Jacob Pan , Alison Schofield , linux-mm@kvack.org, kvm@vger.kernel.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A . Shutemov" Subject: [PATCHv2 59/59] x86/mktme: Demonstration program using the MKTME APIs Date: Wed, 31 Jul 2019 18:08:13 +0300 Message-Id: <20190731150813.26289-60-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190731150813.26289-1-kirill.shutemov@linux.intel.com> References: <20190731150813.26289-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 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: X-Virus-Scanned: ClamAV using ClamSMTP From: Alison Schofield Signed-off-by: Alison Schofield Signed-off-by: Kirill A. Shutemov --- Documentation/x86/mktme/index.rst | 1 + Documentation/x86/mktme/mktme_demo.rst | 53 ++++++++++++++++++++++++++ 2 files changed, 54 insertions(+) create mode 100644 Documentation/x86/mktme/mktme_demo.rst diff --git a/Documentation/x86/mktme/index.rst b/Documentation/x86/mktme/index.rst index ca3c76adc596..3af322d13225 100644 --- a/Documentation/x86/mktme/index.rst +++ b/Documentation/x86/mktme/index.rst @@ -10,3 +10,4 @@ Multi-Key Total Memory Encryption (MKTME) mktme_configuration mktme_keys mktme_encrypt + mktme_demo diff --git a/Documentation/x86/mktme/mktme_demo.rst b/Documentation/x86/mktme/mktme_demo.rst new file mode 100644 index 000000000000..5af78617f887 --- /dev/null +++ b/Documentation/x86/mktme/mktme_demo.rst @@ -0,0 +1,53 @@ +Demonstration Program using MKTME API's +======================================= + +/* Compile with the keyutils library: cc -o mdemo mdemo.c -lkeyutils */ + +#include +#include +#include +#include +#include +#include +#include + +#define PAGE_SIZE sysconf(_SC_PAGE_SIZE) +#define sys_encrypt_mprotect 434 + +void main(void) +{ + char *options_CPU = "algorithm=aes-xts-128 type=cpu"; + long size = PAGE_SIZE; + key_serial_t key; + void *ptra; + int ret; + + /* Allocate an MKTME Key */ + key = add_key("mktme", "testkey", options_CPU, strlen(options_CPU), + KEY_SPEC_THREAD_KEYRING); + + if (key == -1) { + printf("addkey FAILED\n"); + return; + } + /* Map a page of ANONYMOUS memory */ + ptra = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); + if (!ptra) { + printf("failed to mmap"); + goto inval_key; + } + /* Encrypt that page of memory with the MKTME Key */ + ret = syscall(sys_encrypt_mprotect, ptra, size, PROT_NONE, key); + if (ret) + printf("mprotect error [%d]\n", ret); + + /* Enjoy that page of encrypted memory */ + + /* Free the memory */ + ret = munmap(ptra, size); + +inval_key: + /* Free the Key */ + if (keyctl(KEYCTL_INVALIDATE, key) == -1) + printf("invalidate failed on key [%d]\n", key); +}