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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	Borislav Petkov <bp@alien8.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@amacapital.net>,
	David Howells <dhowells@redhat.com>
Cc: Kees Cook <keescook@chromium.org>,
	Dave Hansen <dave.hansen@intel.com>,
	Kai Huang <kai.huang@linux.intel.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>,
	Alison Schofield <alison.schofield@intel.com>,
	linux-mm@kvack.org, kvm@vger.kernel.org,
	keyrings@vger.kernel.org, linux-kernel@vger.kernel.org,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH, RFC 24/62] keys/mktme: Preparse the MKTME key payload
Date: Wed,  8 May 2019 17:43:44 +0300
Message-ID: <20190508144422.13171-25-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20190508144422.13171-1-kirill.shutemov@linux.intel.com>

From: Alison Schofield <alison.schofield@intel.com>

It is a requirement of the Kernel Keys subsystem to provide a
preparse method that validates payloads before key instantiate
methods are called.

Verify that userspace provides valid MKTME options and prepare
the payload for use at key instantiate time.

Create a method to free the preparsed payload. The Kernel Key
subsystem will that to clean up after the key is instantiated.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 include/keys/mktme-type.h  |  39 +++++++++
 security/keys/mktme_keys.c | 165 +++++++++++++++++++++++++++++++++++++
 2 files changed, 204 insertions(+)
 create mode 100644 include/keys/mktme-type.h

diff --git a/include/keys/mktme-type.h b/include/keys/mktme-type.h
new file mode 100644
index 000000000000..032905b288b4
--- /dev/null
+++ b/include/keys/mktme-type.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/* Key service for Multi-KEY Total Memory Encryption */
+
+#ifndef _KEYS_MKTME_TYPE_H
+#define _KEYS_MKTME_TYPE_H
+
+#include <linux/key.h>
+
+/*
+ * The AES-XTS 128 encryption algorithm requires 128 bits for each
+ * user supplied data key and tweak key.
+ */
+#define MKTME_AES_XTS_SIZE	16	/* 16 bytes, 128 bits */
+
+enum mktme_alg {
+	MKTME_ALG_AES_XTS_128,
+};
+
+const char *const mktme_alg_names[] = {
+	[MKTME_ALG_AES_XTS_128]	= "aes-xts-128",
+};
+
+enum mktme_type {
+	MKTME_TYPE_ERROR = -1,
+	MKTME_TYPE_USER,
+	MKTME_TYPE_CPU,
+	MKTME_TYPE_NO_ENCRYPT,
+};
+
+const char *const mktme_type_names[] = {
+	[MKTME_TYPE_USER]	= "user",
+	[MKTME_TYPE_CPU]	= "cpu",
+	[MKTME_TYPE_NO_ENCRYPT]	= "no-encrypt",
+};
+
+extern struct key_type key_type_mktme;
+
+#endif /* _KEYS_MKTME_TYPE_H */
diff --git a/security/keys/mktme_keys.c b/security/keys/mktme_keys.c
index b5e8289f041b..92a047caa829 100644
--- a/security/keys/mktme_keys.c
+++ b/security/keys/mktme_keys.c
@@ -6,6 +6,10 @@
 #include <linux/key.h>
 #include <linux/key-type.h>
 #include <linux/mm.h>
+#include <linux/parser.h>
+#include <linux/string.h>
+#include <asm/intel_pconfig.h>
+#include <keys/mktme-type.h>
 #include <keys/user-type.h>
 
 #include "internal.h"
@@ -69,8 +73,169 @@ int mktme_keyid_from_key(struct key *key)
 	return 0;
 }
 
+enum mktme_opt_id {
+	OPT_ERROR,
+	OPT_TYPE,
+	OPT_KEY,
+	OPT_TWEAK,
+	OPT_ALGORITHM,
+};
+
+static const match_table_t mktme_token = {
+	{OPT_TYPE, "type=%s"},
+	{OPT_KEY, "key=%s"},
+	{OPT_TWEAK, "tweak=%s"},
+	{OPT_ALGORITHM, "algorithm=%s"},
+	{OPT_ERROR, NULL}
+};
+
+struct mktme_payload {
+	u32		keyid_ctrl;	/* Command & Encryption Algorithm */
+	u8		data_key[MKTME_AES_XTS_SIZE];
+	u8		tweak_key[MKTME_AES_XTS_SIZE];
+};
+
+/* Make sure arguments are correct for the TYPE of key requested */
+static int mktme_check_options(struct mktme_payload *payload,
+			       unsigned long token_mask, enum mktme_type type)
+{
+	if (!token_mask)
+		return -EINVAL;
+
+	switch (type) {
+	case MKTME_TYPE_USER:
+		if (test_bit(OPT_ALGORITHM, &token_mask))
+			payload->keyid_ctrl |= MKTME_AES_XTS_128;
+		else
+			return -EINVAL;
+
+		if ((test_bit(OPT_KEY, &token_mask)) &&
+		    (test_bit(OPT_TWEAK, &token_mask)))
+			payload->keyid_ctrl |= MKTME_KEYID_SET_KEY_DIRECT;
+		else
+			return -EINVAL;
+		break;
+
+	case MKTME_TYPE_CPU:
+		if (test_bit(OPT_ALGORITHM, &token_mask))
+			payload->keyid_ctrl |= MKTME_AES_XTS_128;
+		else
+			return -EINVAL;
+
+		payload->keyid_ctrl |= MKTME_KEYID_SET_KEY_RANDOM;
+		break;
+
+	case MKTME_TYPE_NO_ENCRYPT:
+		payload->keyid_ctrl |= MKTME_KEYID_NO_ENCRYPT;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/* Parse the options and store the key programming data in the payload. */
+static int mktme_get_options(char *options, struct mktme_payload *payload)
+{
+	enum mktme_type type = MKTME_TYPE_ERROR;
+	substring_t args[MAX_OPT_ARGS];
+	unsigned long token_mask = 0;
+	char *p = options;
+	int ret, token;
+
+	while ((p = strsep(&options, " \t"))) {
+		if (*p == '\0' || *p == ' ' || *p == '\t')
+			continue;
+		token = match_token(p, mktme_token, args);
+		if (token == OPT_ERROR)
+			return -EINVAL;
+		if (test_and_set_bit(token, &token_mask))
+			return -EINVAL;
+
+		switch (token) {
+		case OPT_KEY:
+			ret = hex2bin(payload->data_key, args[0].from,
+				      MKTME_AES_XTS_SIZE);
+			if (ret < 0)
+				return -EINVAL;
+			break;
+
+		case OPT_TWEAK:
+			ret = hex2bin(payload->tweak_key, args[0].from,
+				      MKTME_AES_XTS_SIZE);
+			if (ret < 0)
+				return -EINVAL;
+			break;
+
+		case OPT_TYPE:
+			type = match_string(mktme_type_names,
+					    ARRAY_SIZE(mktme_type_names),
+					    args[0].from);
+			if (type < 0)
+				return -EINVAL;
+			break;
+
+		case OPT_ALGORITHM:
+			ret = match_string(mktme_alg_names,
+					   ARRAY_SIZE(mktme_alg_names),
+					   args[0].from);
+			if (ret < 0)
+				return -EINVAL;
+			break;
+
+		default:
+			return -EINVAL;
+		}
+	}
+	return mktme_check_options(payload, token_mask, type);
+}
+
+void mktme_free_preparsed_payload(struct key_preparsed_payload *prep)
+{
+	kzfree(prep->payload.data[0]);
+}
+
+/*
+ * Key Service Method to preparse a payload before a key is created.
+ * Check permissions and the options. Load the proposed key field
+ * data into the payload for use by the instantiate method.
+ */
+int mktme_preparse_payload(struct key_preparsed_payload *prep)
+{
+	struct mktme_payload *mktme_payload;
+	size_t datalen = prep->datalen;
+	char *options;
+	int ret;
+
+	if (datalen <= 0 || datalen > 1024 || !prep->data)
+		return -EINVAL;
+
+	options = kmemdup_nul(prep->data, datalen, GFP_KERNEL);
+	if (!options)
+		return -ENOMEM;
+
+	mktme_payload = kzalloc(sizeof(*mktme_payload), GFP_KERNEL);
+	if (!mktme_payload) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	ret = mktme_get_options(options, mktme_payload);
+	if (ret < 0) {
+		kzfree(mktme_payload);
+		goto out;
+	}
+	prep->quotalen = sizeof(mktme_payload);
+	prep->payload.data[0] = mktme_payload;
+out:
+	kzfree(options);
+	return ret;
+}
+
 struct key_type key_type_mktme = {
 	.name		= "mktme",
+	.preparse	= mktme_preparse_payload,
+	.free_preparse	= mktme_free_preparsed_payload,
 	.describe	= user_describe,
 };
 
-- 
2.20.1


  parent reply index

Thread overview: 153+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-08 14:43 [PATCH, RFC 00/62] Intel MKTME enabling Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 01/62] mm: Do no merge VMAs with different encryption KeyIDs Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 02/62] mm: Add helpers to setup zero page mappings Kirill A. Shutemov
2019-05-29  7:21   ` Mike Rapoport
2019-05-08 14:43 ` [PATCH, RFC 03/62] mm/ksm: Do not merge pages with different KeyIDs Kirill A. Shutemov
2019-05-10 18:07   ` Dave Hansen
2019-05-13 14:27     ` Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 04/62] mm/page_alloc: Unify alloc_hugepage_vma() Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 05/62] mm/page_alloc: Handle allocation for encrypted memory Kirill A. Shutemov
2019-05-29  7:21   ` Mike Rapoport
2019-05-29 12:47     ` Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 06/62] mm/khugepaged: Handle encrypted pages Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 07/62] x86/mm: Mask out KeyID bits from page table entry pfn Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 08/62] x86/mm: Introduce variables to store number, shift and mask of KeyIDs Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 09/62] x86/mm: Preserve KeyID on pte_modify() and pgprot_modify() Kirill A. Shutemov
2019-06-14  9:15   ` Peter Zijlstra
2019-06-14 13:03     ` Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 10/62] x86/mm: Detect MKTME early Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 11/62] x86/mm: Add a helper to retrieve KeyID for a page Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 12/62] x86/mm: Add a helper to retrieve KeyID for a VMA Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 13/62] x86/mm: Add hooks to allocate and free encrypted pages Kirill A. Shutemov
2019-06-14  9:34   ` Peter Zijlstra
2019-06-14 11:04     ` Peter Zijlstra
2019-06-14 13:28       ` Kirill A. Shutemov
2019-06-14 13:43         ` Peter Zijlstra
2019-06-14 22:41           ` Kirill A. Shutemov
2019-06-17  9:25             ` Peter Zijlstra
2019-06-14 13:14     ` Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 14/62] x86/mm: Map zero pages into encrypted mappings correctly Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 15/62] x86/mm: Rename CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 16/62] x86/mm: Allow to disable MKTME after enumeration Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 17/62] x86/mm: Calculate direct mapping size Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 18/62] x86/mm: Implement syncing per-KeyID direct mappings Kirill A. Shutemov
2019-06-14  9:51   ` Peter Zijlstra
2019-06-14 22:43     ` Kirill A. Shutemov
2019-06-17  9:27       ` Peter Zijlstra
2019-06-17 14:43         ` Kirill A. Shutemov
2019-06-17 14:51           ` Peter Zijlstra
2019-06-17 15:17             ` Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 19/62] x86/mm: Handle encrypted memory in page_to_virt() and __pa() Kirill A. Shutemov
2019-06-14 11:10   ` Peter Zijlstra
2019-05-08 14:43 ` [PATCH, RFC 20/62] mm/page_ext: Export lookup_page_ext() symbol Kirill A. Shutemov
2019-06-14 11:12   ` Peter Zijlstra
2019-06-14 22:44     ` Kirill A. Shutemov
2019-06-17  9:30       ` Peter Zijlstra
2019-06-17 11:01         ` Kai Huang
2019-06-17 11:13           ` Huang, Kai
2019-05-08 14:43 ` [PATCH, RFC 21/62] mm/rmap: Clear vma->anon_vma on unlink_anon_vmas() Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 22/62] x86/pconfig: Set a valid encryption algorithm for all MKTME commands Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 23/62] keys/mktme: Introduce a Kernel Key Service for MKTME Kirill A. Shutemov
2019-05-08 14:43 ` Kirill A. Shutemov [this message]
2019-05-08 14:43 ` [PATCH, RFC 25/62] keys/mktme: Instantiate and destroy MKTME keys Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 26/62] keys/mktme: Move the MKTME payload into a cache aligned structure Kirill A. Shutemov
2019-06-14 11:35   ` Peter Zijlstra
2019-06-14 17:10     ` Alison Schofield
2019-05-08 14:43 ` [PATCH, RFC 27/62] keys/mktme: Strengthen the entropy of CPU generated MKTME keys Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 28/62] keys/mktme: Set up PCONFIG programming targets for " Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 29/62] keys/mktme: Program MKTME keys into the platform hardware Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 30/62] keys/mktme: Set up a percpu_ref_count for MKTME keys Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 31/62] keys/mktme: Require CAP_SYS_RESOURCE capability " Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 32/62] keys/mktme: Store MKTME payloads if cmdline parameter allows Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 33/62] acpi: Remove __init from acpi table parsing functions Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 34/62] acpi/hmat: Determine existence of an ACPI HMAT Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 35/62] keys/mktme: Require ACPI HMAT to register the MKTME Key Service Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 36/62] acpi/hmat: Evaluate topology presented in ACPI HMAT for MKTME Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 37/62] keys/mktme: Do not allow key creation in unsafe topologies Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 38/62] keys/mktme: Support CPU hotplug for MKTME key service Kirill A. Shutemov
2019-05-08 14:43 ` [PATCH, RFC 39/62] keys/mktme: Find new PCONFIG targets during memory hotplug Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 40/62] keys/mktme: Program new PCONFIG targets with MKTME keys Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 41/62] keys/mktme: Support memory hotplug for " Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 42/62] mm: Generalize the mprotect implementation to support extensions Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 43/62] syscall/x86: Wire up a system call for MKTME encryption keys Kirill A. Shutemov
2019-05-29  7:21   ` Mike Rapoport
2019-05-29 18:12     ` Alison Schofield
2019-05-08 14:44 ` [PATCH, RFC 44/62] x86/mm: Set KeyIDs in encrypted VMAs for MKTME Kirill A. Shutemov
2019-06-14 11:44   ` Peter Zijlstra
2019-06-14 17:33     ` Alison Schofield
2019-06-14 18:26       ` Dave Hansen
2019-06-14 18:46         ` Alison Schofield
2019-06-14 19:11           ` Dave Hansen
2019-06-17  9:10             ` Peter Zijlstra
2019-05-08 14:44 ` [PATCH, RFC 45/62] mm: Add the encrypt_mprotect() system call " Kirill A. Shutemov
2019-06-14 11:47   ` Peter Zijlstra
2019-06-14 17:35     ` Alison Schofield
2019-06-14 11:51   ` Peter Zijlstra
2019-06-15  0:32     ` Alison Schofield
2019-06-17  9:08       ` Peter Zijlstra
2019-06-17 15:07   ` Andy Lutomirski
2019-06-17 15:28     ` Dave Hansen
2019-06-17 15:46       ` Andy Lutomirski
2019-06-17 18:27         ` Dave Hansen
2019-06-17 19:12           ` Andy Lutomirski
2019-06-17 21:36             ` Dave Hansen
2019-06-18  0:48               ` Kai Huang
2019-06-18  1:50                 ` Andy Lutomirski
2019-06-18  2:11                   ` Kai Huang
2019-06-18  4:24                     ` Andy Lutomirski
2019-06-18 14:19                   ` Dave Hansen
2019-06-18  0:05             ` Kai Huang
2019-06-18  0:15               ` Andy Lutomirski
2019-06-18  1:35                 ` Kai Huang
2019-06-18  1:43                   ` Andy Lutomirski
2019-06-18  2:23                     ` Kai Huang
2019-06-18  9:12                       ` Peter Zijlstra
2019-06-18 14:09                         ` Dave Hansen
2019-06-18 16:15                           ` Kirill A. Shutemov
2019-06-18 16:22                             ` Dave Hansen
2019-06-18 16:36                               ` Andy Lutomirski
2019-06-18 16:48                                 ` Dave Hansen
2019-06-18 14:13                 ` Dave Hansen
2019-06-17 23:59           ` Kai Huang
2019-06-18  1:34             ` Lendacky, Thomas
2019-06-18  1:40               ` Andy Lutomirski
2019-06-18  2:02                 ` Lendacky, Thomas
2019-06-18  4:19                 ` Andy Lutomirski
2019-05-08 14:44 ` [PATCH, RFC 46/62] x86/mm: Keep reference counts on encrypted VMAs " Kirill A. Shutemov
2019-06-14 11:54   ` Peter Zijlstra
2019-06-14 18:39     ` Alison Schofield
2019-05-08 14:44 ` [PATCH, RFC 47/62] mm: Restrict MKTME memory encryption to anonymous VMAs Kirill A. Shutemov
2019-06-14 11:55   ` Peter Zijlstra
2019-06-15  0:07     ` Alison Schofield
2019-05-08 14:44 ` [PATCH, RFC 48/62] selftests/x86/mktme: Test the MKTME APIs Kirill A. Shutemov
2019-05-08 17:09   ` Alison Schofield
2019-05-08 14:44 ` [PATCH, RFC 49/62] mm, x86: export several MKTME variables Kirill A. Shutemov
2019-06-14 11:56   ` Peter Zijlstra
2019-06-17  3:14     ` Kai Huang
2019-06-17  7:46       ` Peter Zijlstra
2019-06-17  8:39         ` Kai Huang
2019-06-17 11:25           ` Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 50/62] kvm, x86, mmu: setup MKTME keyID to spte for given PFN Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 51/62] iommu/vt-d: Support MKTME in DMA remapping Kirill A. Shutemov
2019-06-14 12:04   ` Peter Zijlstra
2019-05-08 14:44 ` [PATCH, RFC 52/62] x86/mm: introduce common code for mem encryption Kirill A. Shutemov
2019-05-08 16:58   ` Christoph Hellwig
2019-05-08 20:52     ` Jacob Pan
2019-05-08 21:21       ` Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 53/62] x86/mm: Use common code for DMA memory encryption Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 54/62] x86/mm: Disable MKTME on incompatible platform configurations Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 55/62] x86/mm: Disable MKTME if not all system memory supports encryption Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 56/62] x86: Introduce CONFIG_X86_INTEL_MKTME Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 57/62] x86/mktme: Overview of Multi-Key Total Memory Encryption Kirill A. Shutemov
2019-05-29  7:21   ` Mike Rapoport
2019-05-29 18:13     ` Alison Schofield
2019-07-14 18:16   ` Randy Dunlap
2019-07-15  9:02     ` Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 58/62] x86/mktme: Document the MKTME provided security mitigations Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 59/62] x86/mktme: Document the MKTME kernel configuration requirements Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 60/62] x86/mktme: Document the MKTME Key Service API Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 61/62] x86/mktme: Document the MKTME API for anonymous memory encryption Kirill A. Shutemov
2019-05-08 14:44 ` [PATCH, RFC 62/62] x86/mktme: Demonstration program using the MKTME APIs Kirill A. Shutemov
2019-05-29  7:30 ` [PATCH, RFC 00/62] Intel MKTME enabling Mike Rapoport
2019-05-29 18:20   ` Alison Schofield
2019-06-14 12:15 ` Peter Zijlstra

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KVM Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/kvm/0 kvm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 kvm kvm/ https://lore.kernel.org/kvm \
		kvm@vger.kernel.org kvm@archiver.kernel.org
	public-inbox-index kvm


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.kvm


AGPL code for this site: git clone https://public-inbox.org/ public-inbox