linux-kernel - [PATCH V3 2/6] Update remove_ima_buffer code to use functions from libfdt reducing wrappers functions.

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Date:   Mon, 20 Jul 2020 08:23:38 -0700
From:   Prakhar Srivastava <prsriva@...ux.microsoft.com>
To:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     catalin.marinas@....com, will@...nel.org, mpe@...erman.id.au,
        benh@...nel.crashing.org, paulus@...ba.org, robh+dt@...nel.org,
        frowand.list@...il.com, zohar@...ux.ibm.com,
        dmitry.kasatkin@...il.com, jmorris@...ei.org, serge@...lyn.com,
        pasha.tatashin@...een.com, allison@...utok.net,
        kstewart@...uxfoundation.org, takahiro.akashi@...aro.org,
        tglx@...utronix.de, vincenzo.frascino@....com,
        mark.rutland@....com, masahiroy@...nel.org, james.morse@....com,
        bhsharma@...hat.com, mbrugger@...e.com, hsinyi@...omium.org,
        tao.li@...o.com, christophe.leroy@....fr,
        gregkh@...uxfoundation.org, nramas@...ux.microsoft.com,
        prsriva@...ux.microsoft.com, tusharsu@...ux.microsoft.com,
        balajib@...ux.microsoft.com, bauerman@...ux.ibm.com,
        robh@...nel.org
Subject: [PATCH V3 2/6] Update remove_ima_buffer code to use functions from libfdt reducing wrappers functions.

Signed-off-by: Prakhar Srivastava <prsriva@...ux.microsoft.com>
---
 arch/powerpc/kexec/ima.c | 63 ++++++++++++++++------------------------
 1 file changed, 25 insertions(+), 38 deletions(-)

diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
index 563313703756..a9e4e9f04273 100644
--- a/arch/powerpc/kexec/ima.c
+++ b/arch/powerpc/kexec/ima.c
@@ -12,40 +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;
-}
-
 /**
  * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
  *
@@ -54,7 +20,7 @@ static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
  */
 void remove_ima_buffer(void *fdt, int chosen_node)
 {
-	int ret, len;
+	int ret, len, addr_cells, size_cells;
 	unsigned long addr;
 	size_t size;
 	const void *prop;
@@ -63,7 +29,22 @@ void remove_ima_buffer(void *fdt, int chosen_node)
 	if (!prop)
 		return;
 
-	ret = do_get_kexec_buffer(prop, len, &addr, &size);
+	ret = fdt_address_cells(fdt, chosen_node);
+	if (ret < 0)
+		return;
+	addr_cells = ret;
+
+	ret = fdt_size_cells(fdt, chosen_node);
+	if (ret < 0)
+		return;
+	size_cells = ret;
+
+	if (len < 4 * (addr_cells + size_cells))
+		return;
+
+	addr = of_read_number(prop, addr_cells);
+	size = of_read_number(prop + 4 * addr_cells, size_cells);
+
 	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
 	if (ret)
 		return;
@@ -129,9 +110,15 @@ 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);
-	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);
 
-- 
2.25.1