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-rw-r--r--arch/x86/Kconfig1
-rw-r--r--arch/x86/include/uapi/asm/bootparam.h9
-rw-r--r--arch/x86/kernel/e820.c6
-rw-r--r--arch/x86/kernel/kexec-bzimage64.c42
-rw-r--r--arch/x86/kernel/setup.c63
-rw-r--r--drivers/of/kexec.c13
-rw-r--r--include/linux/ima.h5
-rw-r--r--include/linux/of.h2
-rw-r--r--security/integrity/ima/ima_kexec.c2
9 files changed, 127 insertions, 16 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index be0b95e51df6..670e0edc074f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2033,6 +2033,7 @@ 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
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index bea5cdcdf532..ca0796ac4403 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -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 */
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index f267205f2d5a..9dac24680ff8 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -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);
diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index 170d0fd68b1f..c63974e94272 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -186,11 +186,38 @@ 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,
unsigned int efi_map_offset, unsigned int efi_map_sz,
- unsigned int efi_setup_data_offset)
+ unsigned int setup_data_offset)
{
unsigned int nr_e820_entries;
unsigned long long mem_k, start, end;
@@ -245,8 +272,15 @@ setup_boot_parameters(struct kimage *image, struct boot_params *params,
#ifdef CONFIG_EFI
/* Setup EFI state */
setup_efi_state(params, params_load_addr, efi_map_offset, efi_map_sz,
- efi_setup_data_offset);
+ setup_data_offset);
+ setup_data_offset += sizeof(struct setup_data) +
+ sizeof(struct efi_setup_data);
#endif
+
+ /* Setup IMA log buffer state */
+ setup_ima_state(image, params, params_load_addr,
+ setup_data_offset);
+
/* 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);
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index bd6c6fd373ae..53f863f28b4c 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -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>
@@ -140,6 +141,11 @@ __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;
@@ -330,6 +336,60 @@ 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) {
+ 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_HAVE_IMA_KEXEC) && !defined(CONFIG_OF_FLATTREE)
+int __init ima_free_kexec_buffer(void)
+{
+ int rc;
+
+ if (!ima_kexec_buffer_size)
+ 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)
+ 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;
@@ -355,6 +415,9 @@ 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;
}
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 8d374cc552be..f2e58ddfaed2 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -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>
@@ -115,6 +116,7 @@ static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
return 0;
}
+#ifdef CONFIG_HAVE_IMA_KEXEC
/**
* ima_get_kexec_buffer - get IMA buffer from the previous kernel
* @addr: On successful return, set to point to the buffer contents.
@@ -122,16 +124,13 @@ static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
*
* Return: 0 on success, negative errno on error.
*/
-int ima_get_kexec_buffer(void **addr, size_t *size)
+int __init ima_get_kexec_buffer(void **addr, size_t *size)
{
int ret, len;
unsigned long tmp_addr;
size_t tmp_size;
const void *prop;
- if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
- return -ENOTSUPP;
-
prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
if (!prop)
return -ENOENT;
@@ -149,16 +148,13 @@ int ima_get_kexec_buffer(void **addr, size_t *size)
/**
* ima_free_kexec_buffer - free memory used by the IMA buffer
*/
-int ima_free_kexec_buffer(void)
+int __init ima_free_kexec_buffer(void)
{
int ret;
unsigned long addr;
size_t size;
struct property *prop;
- if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
- return -ENOTSUPP;
-
prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
if (!prop)
return -ENOENT;
@@ -173,6 +169,7 @@ int ima_free_kexec_buffer(void)
return memblock_phys_free(addr, size);
}
+#endif
/**
* remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 426b1744215e..81708ca0ebc7 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -140,6 +140,11 @@ static inline int ima_measure_critical_data(const char *event_label,
#endif /* CONFIG_IMA */
+#ifdef CONFIG_HAVE_IMA_KEXEC
+int __init ima_free_kexec_buffer(void);
+int __init ima_get_kexec_buffer(void **addr, size_t *size);
+#endif
+
#ifdef CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT
extern bool arch_ima_get_secureboot(void);
extern const char * const *arch_get_ima_policy(void);
diff --git a/include/linux/of.h b/include/linux/of.h
index f0a5d6b10c5a..20a4e7cb7afe 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -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)
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index 13753136f03f..419dc405c831 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -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;