@@ -2027,6 +2027,7 @@ config KEXEC_FILE
bool "kexec file based system call"
select KEXEC_CORE
select BUILD_BIN2C
+ select HAVE_IMA_KEXEC if IMA
depends on X86_64
depends on CRYPTO=y
depends on CRYPTO_SHA256=y
@@ -11,6 +11,7 @@
#define SETUP_APPLE_PROPERTIES 5
#define SETUP_JAILHOUSE 6
#define SETUP_CC_BLOB 7
+#define SETUP_IMA 8
#define SETUP_INDIRECT (1<<31)
@@ -172,6 +173,14 @@ struct jailhouse_setup_data {
} __attribute__((packed)) v2;
} __attribute__((packed));
+/*
+ * IMA buffer setup data information from the previous kernel during kexec
+ */
+struct ima_setup_data {
+ __u64 addr;
+ __u64 size;
+} __attribute__((packed));
+
/* The so-called "zeropage" */
struct boot_params {
struct screen_info screen_info; /* 0x000 */
@@ -1017,10 +1017,10 @@ void __init e820__reserve_setup_data(void)
e820__range_update(pa_data, sizeof(*data)+data->len, E820_TYPE_RAM, E820_TYPE_RESERVED_KERN);
/*
- * SETUP_EFI is supplied by kexec and does not need to be
- * reserved.
+ * SETUP_EFI and SETUP_IMA are supplied by kexec and do not need
+ * to be reserved.
*/
- if (data->type != SETUP_EFI)
+ if (data->type != SETUP_EFI && data->type != SETUP_IMA)
e820__range_update_kexec(pa_data,
sizeof(*data) + data->len,
E820_TYPE_RAM, E820_TYPE_RESERVED_KERN);
@@ -186,6 +186,33 @@ setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
}
#endif /* CONFIG_EFI */
+static void
+setup_ima_state(const struct kimage *image, struct boot_params *params,
+ unsigned long params_load_addr,
+ unsigned int ima_setup_data_offset)
+{
+#ifdef CONFIG_IMA_KEXEC
+ struct setup_data *sd = (void *)params + ima_setup_data_offset;
+ unsigned long setup_data_phys;
+ struct ima_setup_data *ima;
+
+ if (!image->ima_buffer_size)
+ return;
+
+ sd->type = SETUP_IMA;
+ sd->len = sizeof(*ima);
+
+ ima = (void *)sd + sizeof(struct setup_data);
+ ima->addr = image->ima_buffer_addr;
+ ima->size = image->ima_buffer_size;
+
+ /* Add setup data */
+ setup_data_phys = params_load_addr + ima_setup_data_offset;
+ sd->next = params->hdr.setup_data;
+ params->hdr.setup_data = setup_data_phys;
+#endif /* CONFIG_IMA_KEXEC */
+}
+
static int
setup_boot_parameters(struct kimage *image, struct boot_params *params,
unsigned long params_load_addr,
@@ -247,6 +274,13 @@ setup_boot_parameters(struct kimage *image, struct boot_params *params,
setup_efi_state(params, params_load_addr, efi_map_offset, efi_map_sz,
efi_setup_data_offset);
#endif
+
+ /* Setup IMA log buffer state */
+ setup_ima_state(image, params, params_load_addr,
+ efi_setup_data_offset +
+ sizeof(struct setup_data) +
+ sizeof(struct efi_setup_data));
+
/* Setup EDD info */
memcpy(params->eddbuf, boot_params.eddbuf,
EDDMAXNR * sizeof(struct edd_info));
@@ -403,6 +437,10 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
sizeof(struct setup_data) +
sizeof(struct efi_setup_data);
+ if (IS_ENABLED(CONFIG_IMA_KEXEC))
+ kbuf.bufsz += sizeof(struct setup_data) +
+ sizeof(struct ima_setup_data);
+
params = kzalloc(kbuf.bufsz, GFP_KERNEL);
if (!params)
return ERR_PTR(-ENOMEM);
@@ -11,6 +11,7 @@
#include <linux/dma-map-ops.h>
#include <linux/dmi.h>
#include <linux/efi.h>
+#include <linux/ima.h>
#include <linux/init_ohci1394_dma.h>
#include <linux/initrd.h>
#include <linux/iscsi_ibft.h>
@@ -145,6 +146,11 @@ __visible unsigned long mmu_cr4_features __ro_after_init;
__visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE;
#endif
+#ifdef CONFIG_IMA
+static phys_addr_t ima_kexec_buffer_phys;
+static size_t ima_kexec_buffer_size;
+#endif
+
/* Boot loader ID and version as integers, for the benefit of proc_dointvec */
int bootloader_type, bootloader_version;
@@ -335,6 +341,59 @@ static void __init reserve_initrd(void)
}
#endif /* CONFIG_BLK_DEV_INITRD */
+static void __init add_early_ima_buffer(u64 phys_addr)
+{
+#ifdef CONFIG_IMA
+ struct ima_setup_data *data;
+
+ data = early_memremap(phys_addr + sizeof(struct setup_data),
+ sizeof(*data));
+ if (!data) {
+ pr_warn("setup: failed to memremap ima_setup_data entry\n");
+ return;
+ }
+ if (data->size != 0) {
+ memblock_reserve(data->addr, data->size);
+ ima_kexec_buffer_phys = data->addr;
+ ima_kexec_buffer_size = data->size;
+ }
+ early_memunmap(data, sizeof(*data));
+#else
+ pr_warn("Passed IMA kexec data, but CONFIG_IMA not set. Ignoring.\n");
+#endif
+}
+
+#if defined(CONFIG_IMA) && !defined(CONFIG_OF_FLATTREE)
+int __meminit ima_free_kexec_buffer(void)
+{
+ int rc;
+
+ if (ima_kexec_buffer_size == 0)
+ return -ENOENT;
+
+ rc = memblock_phys_free(ima_kexec_buffer_phys,
+ ima_kexec_buffer_size);
+ if (rc)
+ return rc;
+
+ ima_kexec_buffer_phys = 0;
+ ima_kexec_buffer_size = 0;
+
+ return 0;
+}
+
+int __init ima_get_kexec_buffer(void **addr, size_t *size)
+{
+ if (ima_kexec_buffer_size == 0)
+ return -ENOENT;
+
+ *addr = __va(ima_kexec_buffer_phys);
+ *size = ima_kexec_buffer_size;
+
+ return 0;
+}
+#endif
+
static void __init parse_setup_data(void)
{
struct setup_data *data;
@@ -360,6 +419,9 @@ static void __init parse_setup_data(void)
case SETUP_EFI:
parse_efi_setup(pa_data, data_len);
break;
+ case SETUP_IMA:
+ add_early_ima_buffer(pa_data);
+ break;
default:
break;
}
@@ -9,6 +9,7 @@
* Copyright (C) 2016 IBM Corporation
*/
+#include <linux/ima.h>
#include <linux/kernel.h>
#include <linux/kexec.h>
#include <linux/memblock.h>
@@ -140,6 +140,9 @@ static inline int ima_measure_critical_data(const char *event_label,
#endif /* CONFIG_IMA */
+int ima_free_kexec_buffer(void);
+int ima_get_kexec_buffer(void **addr, size_t *size);
+
#ifdef CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT
extern bool arch_ima_get_secureboot(void);
extern const char * const *arch_get_ima_policy(void);
@@ -441,8 +441,6 @@ void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
unsigned long initrd_load_addr,
unsigned long initrd_len,
const char *cmdline, size_t extra_fdt_size);
-int ima_get_kexec_buffer(void **addr, size_t *size);
-int ima_free_kexec_buffer(void);
#else /* CONFIG_OF */
static inline void of_core_init(void)
@@ -137,7 +137,7 @@ void ima_add_kexec_buffer(struct kimage *image)
/*
* Restore the measurement list from the previous kernel.
*/
-void ima_load_kexec_buffer(void)
+void __init ima_load_kexec_buffer(void)
{
void *kexec_buffer = NULL;
size_t kexec_buffer_size = 0;
On kexec file load Integrity Measurement Architecture (IMA) subsystem may verify the IMA signature of the kernel and initramfs, and measure it. The command line parameters passed to the kernel in the kexec call may also be measured by IMA. A remote attestation service can verify a TPM quote based on the TPM event log, the IMA measurement list, and the TPM PCR data. This can be achieved only if the IMA measurement log is carried over from the current kernel to the next kernel across the kexec call. powerpc and ARM64 both achieve this using device tree with a "linux,ima-kexec-buffer" node. x86 platforms generally don't make use of device tree, so use the setup_data mechanism to pass the IMA buffer to the new kernel. Signed-off-by: Jonathan McDowell <noodles@fb.com> --- v3: - Rebase on tip/master - Pull ima_(free|get)_kexec_buffer into x86 code - Push ifdefs into functions where possible - Reverse fir tree variable declarations - Fix section annotation on ima_free_kexec_buffer (__meminit) - Only allocate ima_setup_data space when IMA_KEXEC is enabled v2: - Fix operation with EFI systems --- arch/x86/Kconfig | 1 + arch/x86/include/uapi/asm/bootparam.h | 9 ++++ arch/x86/kernel/e820.c | 6 +-- arch/x86/kernel/kexec-bzimage64.c | 38 ++++++++++++++++ arch/x86/kernel/setup.c | 62 +++++++++++++++++++++++++++ drivers/of/kexec.c | 1 + include/linux/ima.h | 3 ++ include/linux/of.h | 2 - security/integrity/ima/ima_kexec.c | 2 +- 9 files changed, 118 insertions(+), 6 deletions(-)