Powerpc has support to carry over the IMA measurement logs. Refatoring the 
non-architecture specific code out of arch/powerpc and into security/ima.

The code adds support for reserving and freeing up of memory for IMA measurement
logs.

---
 arch/powerpc/include/asm/ima.h     |  10 ---
 arch/powerpc/kexec/ima.c           | 126 ++---------------------------
 security/integrity/ima/ima_kexec.c | 116 ++++++++++++++++++++++++++
 3 files changed, 124 insertions(+), 128 deletions(-)

diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
index ead488cf3981..c29ec86498f8 100644
--- a/arch/powerpc/include/asm/ima.h
+++ b/arch/powerpc/include/asm/ima.h
@@ -4,15 +4,6 @@
 
 struct kimage;
 
-int ima_get_kexec_buffer(void **addr, size_t *size);
-int ima_free_kexec_buffer(void);
-
-#ifdef CONFIG_IMA
-void remove_ima_buffer(void *fdt, int chosen_node);
-#else
-static inline void remove_ima_buffer(void *fdt, int chosen_node) {}
-#endif
-
 #ifdef CONFIG_IMA_KEXEC
 int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
                              size_t size);
@@ -22,7 +13,6 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, 
int chosen_node);
 static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
                                   int chosen_node)
 {
-       remove_ima_buffer(fdt, chosen_node);
        return 0;
 }
 #endif /* CONFIG_IMA_KEXEC */
diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
index 720e50e490b6..6054ce91d2a6 100644
--- a/arch/powerpc/kexec/ima.c
+++ b/arch/powerpc/kexec/ima.c
@@ -12,121 +12,6 @@
 #include <linux/memblock.h>
 #include <linux/libfdt.h>
 
-static int get_addr_size_cells(int *addr_cells, int *size_cells)
-{
-       struct device_node *root;
-
-       root = of_find_node_by_path("/");
-       if (!root)
-               return -EINVAL;
-
-       *addr_cells = of_n_addr_cells(root);
-       *size_cells = of_n_size_cells(root);
-
-       of_node_put(root);
-
-       return 0;
-}
-
-static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
-                              size_t *size)
-{
-       int ret, addr_cells, size_cells;
-
-       ret = get_addr_size_cells(&addr_cells, &size_cells);
-       if (ret)
-               return ret;
-
-       if (len < 4 * (addr_cells + size_cells))
-               return -ENOENT;
-
-       *addr = of_read_number(prop, addr_cells);
-       *size = of_read_number(prop + 4 * addr_cells, size_cells);
-
-       return 0;
-}
-
-/**
- * ima_get_kexec_buffer - get IMA buffer from the previous kernel
- * @addr:      On successful return, set to point to the buffer contents.
- * @size:      On successful return, set to the buffer size.
- *
- * Return: 0 on success, negative errno on error.
- */
-int ima_get_kexec_buffer(void **addr, size_t *size)
-{
-       int ret, len;
-       unsigned long tmp_addr;
-       size_t tmp_size;
-       const void *prop;
-
-       prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
-       if (!prop)
-               return -ENOENT;
-
-       ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
-       if (ret)
-               return ret;
-
-       *addr = __va(tmp_addr);
-       *size = tmp_size;
-
-       return 0;
-}
-
-/**
- * ima_free_kexec_buffer - free memory used by the IMA buffer
- */
-int ima_free_kexec_buffer(void)
-{
-       int ret;
-       unsigned long addr;
-       size_t size;
-       struct property *prop;
-
-       prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
-       if (!prop)
-               return -ENOENT;
-
-       ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
-       if (ret)
-               return ret;
-
-       ret = of_remove_property(of_chosen, prop);
-       if (ret)
-               return ret;
-
-       return memblock_free(addr, size);
-
-}
-
-/**
- * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
- *
- * The IMA measurement buffer is of no use to a subsequent kernel, so we always
- * remove it from the device tree.
- */
-void remove_ima_buffer(void *fdt, int chosen_node)
-{
-       int ret, len;
-       unsigned long addr;
-       size_t size;
-       const void *prop;
-
-       prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
-       if (!prop)
-               return;
-
-       ret = do_get_kexec_buffer(prop, len, &addr, &size);
-       fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
-       if (ret)
-               return;
-
-       ret = delete_fdt_mem_rsv(fdt, addr, size);
-       if (!ret)
-               pr_debug("Removed old IMA buffer reservation.\n");
-}
-
 #ifdef CONFIG_IMA_KEXEC
 /**
  * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer
@@ -179,13 +64,18 @@ int setup_ima_buffer(const struct kimage *image, void 
*fdt, int chosen_node)
        int ret, addr_cells, size_cells, entry_size;
        u8 value[16];
 
-       remove_ima_buffer(fdt, chosen_node);
        if (!image->arch.ima_buffer_size)
                return 0;
 
-       ret = get_addr_size_cells(&addr_cells, &size_cells);
-       if (ret)
+       ret = fdt_address_cells(fdt, chosen_node);
+       if (ret < 0)
+               return ret;
+       addr_cells = ret;
+
+       ret = fdt_size_cells(fdt, chosen_node);
+       if (ret < 0)
                return ret;
+       size_cells = ret;
 
        entry_size = 4 * (addr_cells + size_cells);
 
diff --git a/security/integrity/ima/ima_kexec.c 
b/security/integrity/ima/ima_kexec.c
index 121de3e04af2..e1e6d6154015 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -10,8 +10,124 @@
 #include <linux/seq_file.h>
 #include <linux/vmalloc.h>
 #include <linux/kexec.h>
+#include <linux/of.h>
+#include <linux/memblock.h>
+#include <linux/libfdt.h>
 #include "ima.h"
 
+static int get_addr_size_cells(int *addr_cells, int *size_cells)
+{
+       struct device_node *root;
+
+       root = of_find_node_by_path("/");
+       if (!root)
+               return -EINVAL;
+
+       *addr_cells = of_n_addr_cells(root);
+       *size_cells = of_n_size_cells(root);
+
+       of_node_put(root);
+
+       return 0;
+}
+
+static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
+                              size_t *size)
+{
+       int ret, addr_cells, size_cells;
+
+       ret = get_addr_size_cells(&addr_cells, &size_cells);
+       if (ret)
+               return ret;
+
+       if (len < 4 * (addr_cells + size_cells))
+               return -ENOENT;
+
+       *addr = of_read_number(prop, addr_cells);
+       *size = of_read_number(prop + 4 * addr_cells, size_cells);
+
+       return 0;
+}
+
+/**
+ * ima_get_kexec_buffer - get IMA buffer from the previous kernel
+ * @addr:      On successful return, set to point to the buffer contents.
+ * @size:      On successful return, set to the buffer size.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int ima_get_kexec_buffer(void **addr, size_t *size)
+{
+       int ret, len;
+       unsigned long tmp_addr;
+       size_t tmp_size;
+       const void *prop;
+
+       prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
+       if (!prop)
+               return -ENOENT;
+
+       ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
+       if (ret)
+               return ret;
+
+       *addr = __va(tmp_addr);
+       *size = tmp_size;
+
+       return 0;
+}
+
+/**
+ * ima_free_kexec_buffer - free memory used by the IMA buffer
+ */
+int ima_free_kexec_buffer(void)
+{
+       int ret;
+       unsigned long addr;
+       size_t size;
+       struct property *prop;
+
+       prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
+       if (!prop)
+               return -ENOENT;
+
+       ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
+       if (ret)
+               return ret;
+
+       ret = of_remove_property(of_chosen, prop);
+       if (ret)
+               return ret;
+
+       return memblock_free(__pa(addr), size);
+
+}
+
+/**
+ * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
+ *
+ * The IMA measurement buffer is of no use to a subsequent kernel, so we always
+ * remove it from the device tree.
+ */
+void remove_ima_buffer(void *fdt, int chosen_node)
+{
+       int ret, len;
+       unsigned long addr;
+       size_t size;
+       const void *prop;
+
+       prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
+       if (!prop)
+               return;
+
+       do_get_kexec_buffer(prop, len, &addr, &size);
+       ret = fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
+       if (ret < 0)
+               return;
+
+       memblock_free(addr, size);
+}
+
 #ifdef CONFIG_IMA_KEXEC
 static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
                                     unsigned long segment_size)
-- 
2.25.1

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