Re: [PATCH v10 4/8] powerpc: Use ima kexec node functions

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On 12/5/20 11:51 AM, Thiago Jung Bauermann wrote:

Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx> writes:

do_get_kexec_buffer() and get_addr_size_cells() are called by
ima_get_kexec_buffer(), ima_free_kexec_buffer, and remove_ima_buffer()
to retrieve the address and size of the buffer used for carrying
forward the IMA measurement log across kexec system call. These
functions correctly handle a device tree property that is a child node
of the root node, but not anything other than the immediate root
child nodes.

Use the architecture independent functions get_ima_kexec_buffer()
and get_root_addr_size_cells() defined in "drivers/of/ima_kexec.c",

s/ima_kexec.c/kexec.c/
Thanks for catching this. I'll fix it.


to get the address and size of the IMA measurement log buffer from
the device tree. Remove do_get_kexec_buffer() and get_addr_size_cells()
since they are not used anymore.

Co-developed-by: Prakhar Srivastava <prsriva@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Prakhar Srivastava <prsriva@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>

Looks good. Thanks!

Reviewed-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>

Thanks Thiago.

 -lakshmi

---
  arch/powerpc/kexec/ima.c | 58 +++++-----------------------------------
  1 file changed, 7 insertions(+), 51 deletions(-)

diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
index a36c39db4b1a..906e8212435d 100644
--- a/arch/powerpc/kexec/ima.c
+++ b/arch/powerpc/kexec/ima.c
@@ -13,40 +13,6 @@
  #include <linux/libfdt.h>
  #include <asm/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.
@@ -56,16 +22,11 @@ static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
   */
  int ima_get_kexec_buffer(void **addr, size_t *size)
  {
-	int ret, len;
+	int ret;
  	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);
+	ret = get_ima_kexec_buffer(NULL, 0, &tmp_addr, &tmp_size);
  	if (ret)
  		return ret;
@@ -89,7 +50,7 @@ int ima_free_kexec_buffer(void)
  	if (!prop)
  		return -ENOENT;
- ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
+	ret = get_ima_kexec_buffer(NULL, 0, &addr, &size);
  	if (ret)
  		return ret;
@@ -98,7 +59,6 @@ int ima_free_kexec_buffer(void)
  		return ret;
return memblock_free(addr, size);
-
  }
/**
@@ -112,19 +72,15 @@ int ima_free_kexec_buffer(void)
   */
  void remove_ima_buffer(void *fdt, int chosen_node)
  {
-	int ret, len;
+	int ret;
  	unsigned long addr;
  	size_t size;
-	const void *prop;
- prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
-	if (!prop)
+	ret = get_ima_kexec_buffer(fdt, chosen_node, &addr, &size);
+	if (ret)
  		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)
@@ -191,7 +147,7 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
  	if (!image->arch.ima_buffer_size)
  		return 0;
- ret = get_addr_size_cells(&addr_cells, &size_cells);
+	ret = get_root_addr_size_cells(&addr_cells, &size_cells);
  	if (ret)
  		return ret;






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