Re: [PATCH v8 04/15] x86: Secure Launch Resource Table header file

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 3/29/24 3:38 PM, 'Kim Phillips' via trenchboot-devel wrote:
Hi Ross,

On 2/14/24 4:18 PM, Ross Philipson wrote:
Introduce the Secure Launch Resource Table which forms the formal
interface between the pre and post launch code.

Signed-off-by: Ross Philipson <ross.philipson@xxxxxxxxxx>
---
  include/linux/slr_table.h | 270 ++++++++++++++++++++++++++++++++++++++
  1 file changed, 270 insertions(+)
  create mode 100644 include/linux/slr_table.h

diff --git a/include/linux/slr_table.h b/include/linux/slr_table.h
new file mode 100644
index 000000000000..42020988233a
--- /dev/null
+++ b/include/linux/slr_table.h
@@ -0,0 +1,270 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Secure Launch Resource Table
+ *
+ * Copyright (c) 2023, Oracle and/or its affiliates.
+ */
+
+#ifndef _LINUX_SLR_TABLE_H
+#define _LINUX_SLR_TABLE_H
+
+/* Put this in efi.h if it becomes a standard */
+#define SLR_TABLE_GUID                EFI_GUID(0x877a9b2a, 0x0385, 0x45d1, 0xa0, 0x34, 0x9d, 0xac, 0x9c, 0x9e, 0x56, 0x5f)
+
+/* SLR table header values */
+#define SLR_TABLE_MAGIC        0x4452544d
+#define SLR_TABLE_REVISION    1
+
+/* Current revisions for the policy and UEFI config */
+#define SLR_POLICY_REVISION        1
+#define SLR_UEFI_CONFIG_REVISION    1
+
+/* SLR defined architectures */
+#define SLR_INTEL_TXT        1
+#define SLR_AMD_SKINIT        2
+
+/* SLR defined bootloaders */
+#define SLR_BOOTLOADER_INVALID    0
+#define SLR_BOOTLOADER_GRUB    1
+
+/* Log formats */
+#define SLR_DRTM_TPM12_LOG    1
+#define SLR_DRTM_TPM20_LOG    2
+
+/* DRTM Policy Entry Flags */
+#define SLR_POLICY_FLAG_MEASURED    0x1
+#define SLR_POLICY_IMPLICIT_SIZE    0x2
+
+/* Array Lengths */
+#define TPM_EVENT_INFO_LENGTH        32
+#define TXT_VARIABLE_MTRRS_LENGTH    32
+
+/* Tags */
+#define SLR_ENTRY_INVALID    0x0000
+#define SLR_ENTRY_DL_INFO    0x0001
+#define SLR_ENTRY_LOG_INFO    0x0002
+#define SLR_ENTRY_ENTRY_POLICY    0x0003
+#define SLR_ENTRY_INTEL_INFO    0x0004
+#define SLR_ENTRY_AMD_INFO    0x0005
+#define SLR_ENTRY_ARM_INFO    0x0006
+#define SLR_ENTRY_UEFI_INFO    0x0007
+#define SLR_ENTRY_UEFI_CONFIG    0x0008
+#define SLR_ENTRY_END        0xffff
+
+/* Entity Types */
+#define SLR_ET_UNSPECIFIED    0x0000
+#define SLR_ET_SLRT        0x0001
+#define SLR_ET_BOOT_PARAMS    0x0002
+#define SLR_ET_SETUP_DATA    0x0003
+#define SLR_ET_CMDLINE        0x0004
+#define SLR_ET_UEFI_MEMMAP    0x0005
+#define SLR_ET_RAMDISK        0x0006
+#define SLR_ET_TXT_OS2MLE    0x0010
+#define SLR_ET_UNUSED        0xffff
+
+#ifndef __ASSEMBLY__
+
+/*
+ * Primary SLR Table Header
+ */
+struct slr_table {
+    u32 magic;
+    u16 revision;
+    u16 architecture;
+    u32 size;
+    u32 max_size;

Do these need to have their endianness specified with, e.g., __le32?

The working assumption was this would be handled by the way the pre and post launch code was built for a given platform.


+    /* entries[] */

Instead of the above line, a legit 'entries' can be enabled using:

DECLARE_FLEX_ARRAY(struct slr_entry_hdr, entries);

I just declared these without the macro. See below...


+} __packed;

You'd have to move this above struct slr_table which would need it:

+/*
+ * Common SLRT Table Header
+ */
+struct slr_entry_hdr {
+    u16 tag;
+    u16 size;
+} __packed;
+
+/*
+ * Boot loader context
+ */
+struct slr_bl_context {
+    u16 bootloader;
+    u16 reserved;
+    u64 context;
+} __packed;
+
+/*
+ * DRTM Dynamic Launch Configuration
+ */
+struct slr_entry_dl_info {
+    struct slr_entry_hdr hdr;
+    struct slr_bl_context bl_context;
+    u64 dl_handler;
+    u64 dce_base;
+    u32 dce_size;
+    u64 dlme_entry;
+} __packed;
+
+/*
+ * TPM Log Information
+ */
+struct slr_entry_log_info {
+    struct slr_entry_hdr hdr;
+    u16 format;
+    u16 reserved;
+    u64 addr;
+    u32 size;
+} __packed;
+
+/*
+ * DRTM Measurement Policy
+ */
+struct slr_entry_policy {
+    struct slr_entry_hdr hdr;
+    u16 revision;
+    u16 nr_entries;
+    /* policy_entries[] */

... for example
         struct slr_policy_entry entries[];

+} __packed;
+
+/*
+ * DRTM Measurement Entry
+ */
+struct slr_policy_entry {
+    u16 pcr;
+    u16 entity_type;
+    u16 flags;
+    u16 reserved;
+    u64 entity;
+    u64 size;
+    char evt_info[TPM_EVENT_INFO_LENGTH];
+} __packed;
+
+/*
+ * Secure Launch defined MTRR saving structures
+ */
+struct slr_txt_mtrr_pair {
+    u64 mtrr_physbase;
+    u64 mtrr_physmask;
+} __packed;
+
+struct slr_txt_mtrr_state {
+    u64 default_mem_type;
+    u64 mtrr_vcnt;
+    struct slr_txt_mtrr_pair mtrr_pair[TXT_VARIABLE_MTRRS_LENGTH];
+} __packed;
+
+/*
+ * Intel TXT Info table
+ */
+struct slr_entry_intel_info {
+    struct slr_entry_hdr hdr;
+    u64 saved_misc_enable_msr;
+    struct slr_txt_mtrr_state saved_bsp_mtrrs;
+} __packed;
+
+/*
+ * AMD SKINIT Info table
+ */
+struct slr_entry_amd_info {
+    struct slr_entry_hdr hdr;
+} __packed;
+
+/*
+ * ARM DRTM Info table
+ */
+struct slr_entry_arm_info {
+    struct slr_entry_hdr hdr;
+} __packed;

Shouldn't these three structs be added as part of their
separate per-vendor enablement patches?

They got dropped for now. They will be introduced as they are needed. For AMD a platform specific structure would probably hold the address of the SKL which in AMD terms is the Secure Loader Block.


+struct slr_entry_uefi_config {
+    struct slr_entry_hdr hdr;
+    u16 revision;
+    u16 nr_entries;
+    /* uefi_cfg_entries[] */
+} __packed;
+
+struct slr_uefi_cfg_entry {
+    u16 pcr;
+    u16 reserved;
+    u64 cfg; /* address or value */
+    u32 size;
+    char evt_info[TPM_EVENT_INFO_LENGTH];
+} __packed;
+
+static inline void *slr_end_of_entrys(struct slr_table *table)
+{
+    return (((void *)table) + table->size);
+}
+
+static inline struct slr_entry_hdr *
+slr_next_entry(struct slr_table *table,
+           struct slr_entry_hdr *curr)
+{
+    struct slr_entry_hdr *next = (struct slr_entry_hdr *)
+                ((u8 *)curr + curr->size);
+
+    if ((void *)next >= slr_end_of_entrys(table))
+        return NULL;
+    if (next->tag == SLR_ENTRY_END)
+        return NULL;
+
+    return next;
+}
+
+static inline struct slr_entry_hdr *
+slr_next_entry_by_tag(struct slr_table *table,
+              struct slr_entry_hdr *entry,
+              u16 tag)
+{
+    if (!entry) /* Start from the beginning */
+        entry = (struct slr_entry_hdr *)(((u8 *)table) + sizeof(*table));

Back to the 'entries', the above line can now be made more readable:

entry = table->entries;

That's just one example, this flex array simplification can be made
in other structs in this series, too.

This one may have escaped me. I can take a look or if you want to submit a PR, the working v9 branch is here:

https://github.com/TrenchBoot/linux/tree/linux-sl-6.7

We have a format that we use for commit messages to make rebases easier. It was documented somewhere but I can't find it right now. It should be obvious looking at the existing commit though.

Thank you,
Ross




Cheers,

Kim

+
+    for ( ; ; ) {
+        if (entry->tag == tag)
+            return entry;
+
+        entry = slr_next_entry(table, entry);
+        if (!entry)
+            return NULL;
+    }
+
+    return NULL;
+}
+
+static inline int
+slr_add_entry(struct slr_table *table,
+          struct slr_entry_hdr *entry)
+{
+    struct slr_entry_hdr *end;
+
+    if ((table->size + entry->size) > table->max_size)
+        return -1;
+
+    memcpy((u8 *)table + table->size - sizeof(*end), entry, entry->size);
+    table->size += entry->size;
+
+    end  = (struct slr_entry_hdr *)((u8 *)table + table->size - sizeof(*end));
+    end->tag = SLR_ENTRY_END;
+    end->size = sizeof(*end);
+
+    return 0;
+}
+
+static inline void
+slr_init_table(struct slr_table *slrt, u16 architecture, u32 max_size)
+{
+    struct slr_entry_hdr *end;
+
+    slrt->magic = SLR_TABLE_MAGIC;
+    slrt->revision = SLR_TABLE_REVISION;
+    slrt->architecture = architecture;
+    slrt->size = sizeof(*slrt) + sizeof(*end);
+    slrt->max_size = max_size;
+    end = (struct slr_entry_hdr *)((u8 *)slrt + sizeof(*slrt));
+    end->tag = SLR_ENTRY_END;
+    end->size = sizeof(*end);
+}
+
+#endif /* !__ASSEMBLY */
+
+#endif /* _LINUX_SLR_TABLE_H */



_______________________________________________
kexec mailing list
kexec@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/kexec




[Index of Archives]     [LM Sensors]     [Linux Sound]     [ALSA Users]     [ALSA Devel]     [Linux Audio Users]     [Linux Media]     [Kernel]     [Gimp]     [Yosemite News]     [Linux Media]

  Powered by Linux