openwrt-xburst/target/linux/generic/patches-3.1/335-mips-kexec-cleanup-kexec-tools-parameter-handling.patch

--- a/arch/mips/kernel/machine_kexec.c
+++ b/arch/mips/kernel/machine_kexec.c
@@ -23,67 +23,104 @@ void (*relocated_kexec_smp_wait) (void *
 atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
 #endif
 
-static void machine_kexec_init_args(void)
+#define KEXEC_MIPS_ARGV_BUF_SIZE	COMMAND_LINE_SIZE
+#define KEXEC_MIPS_ARGV_MAX_ARGS	(COMMAND_LINE_SIZE / 15)
+
+char kexec_argv_buf[KEXEC_MIPS_ARGV_BUF_SIZE] __kexec;
+int kexec_argv[KEXEC_MIPS_ARGV_MAX_ARGS] __kexec;
+
+static void
+machine_kexec_print_args(void)
 {
-	kexec_args[0] = fw_arg0;
-	kexec_args[1] = fw_arg1;
-	kexec_args[2] = fw_arg2;
-	kexec_args[3] = fw_arg3;
+	int i;
 
 	pr_info("kexec_args[0] (argc): %lu\n", kexec_args[0]);
 	pr_info("kexec_args[1] (argv): %p\n", (void *)kexec_args[1]);
 	pr_info("kexec_args[2] (env ): %p\n", (void *)kexec_args[2]);
 	pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
-}
 
-#define ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
+	for (i = 0; i < kexec_args[0]; i++)
+		pr_info("kexec_argv[%d] = %p, %s\n", i,
+			(char *)kexec_argv[i], (char *)kexec_argv[i]);
+}
 
-int machine_kexec_pass_args(struct kimage *image)
+static void
+machine_kexec_init_argv(struct kimage *image)
 {
-	int i, argc = 0;
-	char *bootloader = "kexec";
-	int *kexec_argv = (int *)kexec_args[1];
+	void __user *buf;
+	size_t bufsz;
+	size_t size;
+	int i;
 
+	bufsz = 0;
 	for (i = 0; i < image->nr_segments; i++) {
-		if (!strncmp(bootloader, (char *)image->segment[i].buf,
-				strlen(bootloader))) {
-			/*
-			 * convert command line string to array
-			 * of parameters (as bootloader does).
-			 */
-			/*
-			 * Note: we do treat the 1st string "kexec" as an
-			 * argument ;-) so, argc here is 1.
-			 */
-			char *str = (char *)image->segment[i].buf;
-			char *ptr = strchr(str, ' ');
-			char *kbuf = (char *)kexec_argv[0];
-			/* Whenever --command-line or --append used, "kexec" is copied */
-			argc = 1;
-			/* Parse the offset */
-			while (ptr && (ARGV_MAX_ARGS > argc)) {
-				*ptr = '\0';
-				if (ptr[1] != ' ' && ptr[1] != '\0') {
-					int offt = (int)(ptr - str + 1);
-					kexec_argv[argc] = (int)kbuf + offt;
-					argc++;
-				}
-				ptr = strchr(ptr + 1, ' ');
-			}
-			if (argc > 1) {
-				/* Copy to kernel space */
-				copy_from_user(kbuf, (char *)image->segment[i].buf, image->segment[i].bufsz);
-				fw_arg0 = kexec_args[0] = argc;
-			}
-			break;
+		struct kexec_segment *seg;
+
+		seg = &image->segment[i];
+		if (seg->bufsz < 6)
+			continue;
+
+		if (strncmp((char *) seg->buf, "kexec", 5))
+			continue;
+
+		/* don't copy "kexec" */
+		buf = seg->buf + 5;
+		bufsz = seg->bufsz - 5;
+		break;
+	}
+
+	if (i >= image->nr_segments)
+		return;
+
+	size = KEXEC_MIPS_ARGV_BUF_SIZE - 1;
+	size = min(size, bufsz);
+	if (size < bufsz)
+		pr_warn("kexec command line truncated to %d bytes\n", size);
+
+	/* Copy to kernel space */
+	copy_from_user(kexec_argv_buf, buf, size);
+}
+
+static void
+machine_kexec_parse_argv(struct kimage *image)
+{
+	char *reboot_code_buffer;
+	int reloc_delta;
+	char *ptr;
+	int argc;
+	int i;
+
+	ptr = kexec_argv_buf;
+	argc = 0;
+
+	/*
+	 * convert command line string to array of parameters
+	 * (as bootloader does).
+	 */
+	while (ptr && *ptr && (KEXEC_MIPS_ARGV_MAX_ARGS > argc)) {
+		if (*ptr == ' ') {
+			*ptr++ = '\0';
+			continue;
 		}
+
+		kexec_argv[argc++] = (int) ptr;
+		ptr = strchr(ptr, ' ');
 	}
 
-	pr_info("argc = %lu\n", kexec_args[0]);
-	for (i = 0; i < kexec_args[0]; i++)
-		pr_info("argv[%d] = %p, %s\n", i, (char *)kexec_argv[i], (char *)kexec_argv[i]);
+	if (!argc)
+		return;
 
-	return 0;
+	kexec_args[0] = argc;
+	kexec_args[1] = (int) kexec_argv;
+	kexec_args[2] = 0;
+	kexec_args[3] = 0;
+
+	reboot_code_buffer = page_address(image->control_code_page);
+	reloc_delta = reboot_code_buffer - (char *) &__start___kexec_relocate;
+
+	kexec_args[1] += reloc_delta;
+	for (i = 0; i < argc; i++)
+		kexec_argv[i] += reloc_delta;
 }
 
 int
@@ -95,8 +132,14 @@ machine_kexec_prepare(struct kimage *kim
 	 *
 	 * This can be overrided by _machine_kexec_prepare().
 	 */
-	machine_kexec_init_args();
-	machine_kexec_pass_args(kimage);
+
+	kexec_args[0] = fw_arg0;
+	kexec_args[1] = fw_arg1;
+	kexec_args[2] = fw_arg2;
+	kexec_args[3] = fw_arg3;
+
+	machine_kexec_init_argv(kimage);
+	machine_kexec_parse_argv(kimage);
 
 	if (_machine_kexec_prepare)
 		return _machine_kexec_prepare(kimage);
@@ -152,11 +195,13 @@ machine_kexec(struct kimage *image)
 	pr_info("kexec_indirection_page = %p\n",
 			(void *)kexec_indirection_page);
 
+	pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
+			&__start___kexec_relocate, (void *)reboot_code_buffer);
+
 	memcpy((void *)reboot_code_buffer, &__start___kexec_relocate,
 	       kexec_relocate_size);
 
-	pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
-			&__start___kexec_relocate, (void *)reboot_code_buffer);
+	machine_kexec_print_args();
 
 	/*
 	 * The generic kexec code builds a page list with physical