target/linux/generic/patches-3.7/335-mips-kexec-cleanup-kexec-tools-parameter-handling.patch

   1 --- a/arch/mips/kernel/machine_kexec.c
   2 +++ b/arch/mips/kernel/machine_kexec.c
   3 @@ -23,67 +23,104 @@ void (*relocated_kexec_smp_wait) (void *
   4  atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
   5  #endif
   6
   7 -static void machine_kexec_init_args(void)
   8 +#define KEXEC_MIPS_ARGV_BUF_SIZE       COMMAND_LINE_SIZE
   9 +#define KEXEC_MIPS_ARGV_MAX_ARGS       (COMMAND_LINE_SIZE / 15)
  10 +
  11 +char kexec_argv_buf[KEXEC_MIPS_ARGV_BUF_SIZE] __kexec;
  12 +char *kexec_argv[KEXEC_MIPS_ARGV_MAX_ARGS] __kexec;
  13 +
  14 +static void
  15 +machine_kexec_print_args(void)
  16  {
  17 -       kexec_args[0] = fw_arg0;
  18 -       kexec_args[1] = fw_arg1;
  19 -       kexec_args[2] = fw_arg2;
  20 -       kexec_args[3] = fw_arg3;
  21 +       int i;
  22
  23         pr_info("kexec_args[0] (argc): %lu\n", kexec_args[0]);
  24         pr_info("kexec_args[1] (argv): %p\n", (void *)kexec_args[1]);
  25         pr_info("kexec_args[2] (env ): %p\n", (void *)kexec_args[2]);
  26         pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
  27 -}
  28
  29 -#define ARGV_MAX_ARGS (COMMAND_LINE_SIZE / 15)
  30 +       for (i = 0; i < kexec_args[0]; i++)
  31 +               pr_info("kexec_argv[%d] = %p, %s\n", i,
  32 +                       (char *)kexec_argv[i], (char *)kexec_argv[i]);
  33 +}
  34
  35 -int machine_kexec_pass_args(struct kimage *image)
  36 +static void
  37 +machine_kexec_init_argv(struct kimage *image)
  38  {
  39 -       int i, argc = 0;
  40 -       char *bootloader = "kexec";
  41 -       int *kexec_argv = (int *)kexec_args[1];
  42 +       void __user *buf = NULL;
  43 +       size_t bufsz;
  44 +       size_t size;
  45 +       int i;
  46
  47 +       bufsz = 0;
  48         for (i = 0; i < image->nr_segments; i++) {
  49 -               if (!strncmp(bootloader, (char *)image->segment[i].buf,
  50 -                               strlen(bootloader))) {
  51 -                       /*
  52 -                        * convert command line string to array
  53 -                        * of parameters (as bootloader does).
  54 -                        */
  55 -                       /*
  56 -                        * Note: we do treat the 1st string "kexec" as an
  57 -                        * argument ;-) so, argc here is 1.
  58 -                        */
  59 -                       char *str = (char *)image->segment[i].buf;
  60 -                       char *ptr = strchr(str, ' ');
  61 -                       char *kbuf = (char *)kexec_argv[0];
  62 -                       /* Whenever --command-line or --append used, "kexec" is copied */
  63 -                       argc = 1;
  64 -                       /* Parse the offset */
  65 -                       while (ptr && (ARGV_MAX_ARGS > argc)) {
  66 -                               *ptr = '\0';
  67 -                               if (ptr[1] != ' ' && ptr[1] != '\0') {
  68 -                                       int offt = (int)(ptr - str + 1);
  69 -                                       kexec_argv[argc] = (int)kbuf + offt;
  70 -                                       argc++;
  71 -                               }
  72 -                               ptr = strchr(ptr + 1, ' ');
  73 -                       }
  74 -                       if (argc > 1) {
  75 -                               /* Copy to kernel space */
  76 -                               copy_from_user(kbuf, (char *)image->segment[i].buf, image->segment[i].bufsz);
  77 -                               fw_arg0 = kexec_args[0] = argc;
  78 -                       }
  79 -                       break;
  80 +               struct kexec_segment *seg;
  81 +
  82 +               seg = &image->segment[i];
  83 +               if (seg->bufsz < 6)
  84 +                       continue;
  85 +
  86 +               if (strncmp((char *) seg->buf, "kexec", 5))
  87 +                       continue;
  88 +
  89 +               /* don't copy "kexec" */
  90 +               buf = seg->buf + 5;
  91 +               bufsz = seg->bufsz - 5;
  92 +               break;
  93 +       }
  94 +
  95 +       if (!buf)
  96 +               return;
  97 +
  98 +       size = KEXEC_MIPS_ARGV_BUF_SIZE - 1;
  99 +       size = min(size, bufsz);
 100 +       if (size < bufsz)
 101 +               pr_warn("kexec command line truncated to %zd bytes\n", size);
 102 +
 103 +       /* Copy to kernel space */
 104 +       copy_from_user(kexec_argv_buf, buf, size);
 105 +}
 106 +
 107 +static void
 108 +machine_kexec_parse_argv(struct kimage *image)
 109 +{
 110 +       char *reboot_code_buffer;
 111 +       int reloc_delta;
 112 +       char *ptr;
 113 +       int argc;
 114 +       int i;
 115 +
 116 +       ptr = kexec_argv_buf;
 117 +       argc = 0;
 118 +
 119 +       /*
 120 +        * convert command line string to array of parameters
 121 +        * (as bootloader does).
 122 +        */
 123 +       while (ptr && *ptr && (KEXEC_MIPS_ARGV_MAX_ARGS > argc)) {
 124 +               if (*ptr == ' ') {
 125 +                       *ptr++ = '\0';
 126 +                       continue;
 127                 }
 128 +
 129 +               kexec_argv[argc++] = ptr;
 130 +               ptr = strchr(ptr, ' ');
 131         }
 132
 133 -       pr_info("argc = %lu\n", kexec_args[0]);
 134 -       for (i = 0; i < kexec_args[0]; i++)
 135 -               pr_info("argv[%d] = %p, %s\n", i, (char *)kexec_argv[i], (char *)kexec_argv[i]);
 136 +       if (!argc)
 137 +               return;
 138
 139 -       return 0;
 140 +       kexec_args[0] = argc;
 141 +       kexec_args[1] = (unsigned long)kexec_argv;
 142 +       kexec_args[2] = 0;
 143 +       kexec_args[3] = 0;
 144 +
 145 +       reboot_code_buffer = page_address(image->control_code_page);
 146 +       reloc_delta = reboot_code_buffer - (char *) &__start___kexec_relocate;
 147 +
 148 +       kexec_args[1] += reloc_delta;
 149 +       for (i = 0; i < argc; i++)
 150 +               kexec_argv[i] += reloc_delta;
 151  }
 152
 153  int
 154 @@ -95,8 +132,14 @@ machine_kexec_prepare(struct kimage *kim
 155          *
 156          * This can be overrided by _machine_kexec_prepare().
 157          */
 158 -       machine_kexec_init_args();
 159 -       machine_kexec_pass_args(kimage);
 160 +
 161 +       kexec_args[0] = fw_arg0;
 162 +       kexec_args[1] = fw_arg1;
 163 +       kexec_args[2] = fw_arg2;
 164 +       kexec_args[3] = fw_arg3;
 165 +
 166 +       machine_kexec_init_argv(kimage);
 167 +       machine_kexec_parse_argv(kimage);
 168
 169         if (_machine_kexec_prepare)
 170                 return _machine_kexec_prepare(kimage);
 171 @@ -152,11 +195,13 @@ machine_kexec(struct kimage *image)
 172         pr_info("kexec_indirection_page = %p\n",
 173                         (void *)kexec_indirection_page);
 174
 175 +       pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
 176 +                       &__start___kexec_relocate, (void *)reboot_code_buffer);
 177 +
 178         memcpy((void *)reboot_code_buffer, &__start___kexec_relocate,
 179                kexec_relocate_size);
 180
 181 -       pr_info("Copy kexec_relocate section from %p to reboot_code_buffer: %p\n",
 182 -                       &__start___kexec_relocate, (void *)reboot_code_buffer);
 183 +       machine_kexec_print_args();
 184
 185         /*
 186          * The generic kexec code builds a page list with physical