remoteproc: track loaded ELF section string-table size

Store the loaded section string-table size in the ELF image information
for both ELF32 and ELF64 images.

Keeping the size alongside the string-table pointer allows later section
name lookups to validate sh_name offsets against the actual loaded table
bounds.

Signed-off-by: Ben Levinsky <ben.levinsky@amd.com>

lib/include/openamp/elf_loader.h

@@ -290,6 +290,7 @@ struct elf32_info {
 	Elf32_Phdr *phdrs;
 	Elf32_Shdr *shdrs;
 	void *shstrtab;
+	size_t shstrtab_size;
 };
 
 struct elf64_info {
@@ -298,6 +299,7 @@ struct elf64_info {
 	Elf64_Phdr *phdrs;
 	Elf64_Shdr *shdrs;
 	void *shstrtab;
+	size_t shstrtab_size;
 };
 
 #define ELF_STATE_INIT              0x0L

lib/remoteproc/elf_loader.c

@@ -207,6 +207,21 @@ static void **elf_shstrtab_ptr(void *elf_info)
 	}
 }
 
+/**
+ * @brief Store the loaded ELF section string table size.
+ *
+ * @param elf_info	ELF information.
+ * @param size		Loaded section string table size.
+ */
+static void elf_set_shstrtab_size(void *elf_info, size_t size)
+{
+	if (elf_is_64(elf_info) == 0) {
+		((struct elf32_info *)elf_info)->shstrtab_size = size;
+	} else {
+		((struct elf64_info *)elf_info)->shstrtab_size = size;
+	}
+}
+
 static int *elf_load_state(void *elf_info)
 {
 	if (elf_is_64(elf_info) == 0) {
@@ -598,6 +613,7 @@ int elf_load_header(const void *img_data, size_t offset, size_t len,
 		*shstrtab = metal_allocate_memory(shstrtab_size);
 		if (!*shstrtab)
 			return -RPROC_ENOMEM;
+		elf_set_shstrtab_size(*img_info, shstrtab_size);
 		memcpy(*shstrtab,
 		       (const char *)img_data + shstrtab_offset,
 		       shstrtab_size);