target/linux/generic/patches-4.3/995-mangle_bootargs.patch

   1 --- a/init/main.c
   2 +++ b/init/main.c
   3 @@ -355,6 +355,29 @@ static inline void setup_nr_cpu_ids(void
   4  static inline void smp_prepare_cpus(unsigned int maxcpus) { }
   5  #endif
   6
   7 +#ifdef CONFIG_MANGLE_BOOTARGS
   8 +static void __init mangle_bootargs(char *command_line)
   9 +{
  10 +       char *rootdev;
  11 +       char *rootfs;
  12 +
  13 +       rootdev = strstr(command_line, "root=/dev/mtdblock");
  14 +
  15 +       if (rootdev)
  16 +               strncpy(rootdev, "mangled_rootblock=", 18);
  17 +
  18 +       rootfs = strstr(command_line, "rootfstype");
  19 +
  20 +       if (rootfs)
  21 +               strncpy(rootfs, "mangled_fs", 10);
  22 +
  23 +}
  24 +#else
  25 +static void __init mangle_bootargs(char *command_line)
  26 +{
  27 +}
  28 +#endif
  29 +
  30  /*
  31   * We need to store the untouched command line for future reference.
  32   * We also need to store the touched command line since the parameter
  33 @@ -527,6 +550,7 @@ asmlinkage __visible void __init start_k
  34         pr_notice("%s", linux_banner);
  35         setup_arch(&command_line);
  36         mm_init_cpumask(&init_mm);
  37 +       mangle_bootargs(command_line);
  38         setup_command_line(command_line);
  39         setup_nr_cpu_ids();
  40         setup_per_cpu_areas();
  41 --- a/init/Kconfig
  42 +++ b/init/Kconfig
  43 @@ -1638,6 +1638,15 @@ config EMBEDDED
  44           an embedded system so certain expert options are available
  45           for configuration.
  46
  47 +config MANGLE_BOOTARGS
  48 +       bool "Rename offending bootargs"
  49 +       depends on EXPERT
  50 +       help
  51 +         Sometimes the bootloader passed bogus root= and rootfstype=
  52 +         parameters to the kernel, and while you want to ignore them,
  53 +         you need to know the values f.e. to support dual firmware
  54 +         layouts on the flash.
  55 +
  56  config HAVE_PERF_EVENTS
  57         bool
  58         help