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Message-ID: <1490383355-23176-7-git-send-email-jliang@xilinx.com>
Date: Fri, 24 Mar 2017 12:22:22 -0700
From: Wendy Liang <wendy.liang@...inx.com>
To: <bjorn.andersson@...aro.org>
CC: <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
"Wendy Liang" <wendy.liang@...inx.com>,
Wendy Liang <jliang@...inx.com>,
Michal Simek <michal.simek@...inx.com>
Subject: [RFC LINUX PATCH 06/19] remoteproc: elf loader: Add get checksum firmware implementation
From: Wendy Liang <wendy.liang@...inx.com>
Add get_chksum() implementation to calculate the checksum of
the loadable sections of the firmware.
Signed-off-by: Wendy Liang <jliang@...inx.com>
Signed-off-by: Michal Simek <michal.simek@...inx.com>
---
drivers/remoteproc/Kconfig | 1 +
drivers/remoteproc/remoteproc_elf_loader.c | 109 +++++++++++++++++++++++++++++
drivers/remoteproc/remoteproc_internal.h | 3 +
3 files changed, 113 insertions(+)
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 65f86bc..d832f3b 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -7,6 +7,7 @@ config REMOTEPROC
select FW_LOADER
select VIRTIO
select VIRTUALIZATION
+ select CRYPTO
help
Support for remote processors (such as DSP coprocessors). These
are mainly used on embedded systems.
diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
index c523983..f508083 100644
--- a/drivers/remoteproc/remoteproc_elf_loader.c
+++ b/drivers/remoteproc/remoteproc_elf_loader.c
@@ -29,6 +29,7 @@
#include <linux/firmware.h>
#include <linux/remoteproc.h>
#include <linux/elf.h>
+#include <crypto/hash.h>
#include "remoteproc_internal.h"
@@ -328,10 +329,118 @@ u32 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
return rproc_da_to_va(rproc, shdr->sh_addr, shdr->sh_size);
}
+/**
+ * rproc_elf_get_chksum() - calcuate checksum of the loadable section
+ * @rproc: the rproc handle
+ * @fw: the ELF firmware image
+ * @algo: name of the checksum algorithm
+ * @chksum: checksum
+ * @output_size: size of the checksum
+ *
+ * This function calculate the checksum of the loadable secitons
+ * of the specified firmware.
+ *
+ * Returns 0 for success, negative value for failure.
+ */
+static int
+rproc_elf_get_chksum(struct rproc *rproc, const struct firmware *fw,
+ char *algo, u8 *chksum, int output_size)
+{
+ int ret, i;
+ struct device *dev = &rproc->dev;
+ struct crypto_shash *tfm;
+ struct shash_desc *desc;
+ int algo_len = 0;
+ struct elf32_hdr *ehdr;
+ struct elf32_phdr *phdr;
+ const u8 *elf_data = fw->data;
+
+ memset(chksum, 0, output_size);
+ /* If no algo is specified, default it to "sha256" */
+ if (!strlen(algo))
+ sprintf(algo, "sha256");
+ ret = crypto_has_alg(algo, 0, 0);
+ if (!ret) {
+ dev_err(dev, "failed to find crypto algo: %s.\n", algo);
+ return -EINVAL;
+ }
+ dev_dbg(dev, "firmware checksum algo: %s.\n", algo);
+ tfm = crypto_alloc_shash(algo, 0, 0);
+ if (!tfm) {
+ dev_err(dev, "failed to allocate shash.\n");
+ return -ENOMEM;
+ }
+ algo_len = crypto_shash_digestsize(tfm);
+ if (algo_len > output_size) {
+ dev_err(dev,
+ "algo digest size %d is larger expected %d.\n",
+ algo_len, output_size);
+ return -EINVAL;
+ }
+ desc = kzalloc(sizeof(*desc) + algo_len, GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+ desc->tfm = tfm;
+ ret = crypto_shash_init(desc);
+ if (ret) {
+ dev_err(dev, "failed crypto %s initialization.\n", algo);
+ return ret;
+ }
+
+ ehdr = (struct elf32_hdr *)elf_data;
+ phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
+
+ /* go through the available ELF segments */
+ for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
+ u32 memsz = phdr->p_memsz;
+ u32 filesz = phdr->p_filesz;
+ u32 offset = phdr->p_offset;
+
+ if (phdr->p_type != PT_LOAD)
+ continue;
+
+ if (filesz > memsz) {
+ dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
+ filesz, memsz);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (offset + filesz > fw->size) {
+ dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n",
+ offset + filesz, fw->size);
+ ret = -EINVAL;
+ break;
+ }
+
+ /* put the segment where the remote processor expects it */
+ if (phdr->p_filesz) {
+ ret = crypto_shash_update(desc,
+ elf_data + offset, filesz);
+ if (ret) {
+ dev_err(dev,
+ "Failed to update fw crypto digest state at offset 0x%x, size 0x%x.\n",
+ offset, filesz);
+ return ret;
+ }
+ }
+
+ }
+ ret = crypto_shash_final(desc, chksum);
+ crypto_free_shash(tfm);
+ kfree(desc);
+ if (ret) {
+ dev_err(dev, "failed to finalize checksum of firmware.\n");
+ return ret;
+ }
+ return ret;
+}
+
const struct rproc_fw_ops rproc_elf_fw_ops = {
.load = rproc_elf_load_segments,
.find_rsc_table = rproc_elf_find_rsc_table,
.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
.sanity_check = rproc_elf_sanity_check,
+ .get_chksum = rproc_elf_get_chksum,
.get_boot_addr = rproc_elf_get_boot_addr
};
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index 1e9e5b3..f03e07a 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -33,6 +33,7 @@
* expects to find it
* @sanity_check: sanity check the fw image
* @get_boot_addr: get boot address to entry point specified in firmware
+ * @get_chksum: get checksum of the loadable sections of the firmware
*/
struct rproc_fw_ops {
struct resource_table *(*find_rsc_table)(struct rproc *rproc,
@@ -43,6 +44,8 @@ struct rproc_fw_ops {
int (*load)(struct rproc *rproc, const struct firmware *fw);
int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
u32 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
+ int (*get_chksum)(struct rproc *rproc, const struct firmware *fw,
+ char *algo, u8 *chksum, int output_size);
};
/* from remoteproc_core.c */
--
1.9.1
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