diff options
Diffstat (limited to 'target/linux/generic/pending-4.19/920-mangle_bootargs.patch')
| -rw-r--r-- | target/linux/generic/pending-4.19/920-mangle_bootargs.patch | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.19/920-mangle_bootargs.patch b/target/linux/generic/pending-4.19/920-mangle_bootargs.patch new file mode 100644 index 0000000000..adeb9f12f9 --- /dev/null +++ b/target/linux/generic/pending-4.19/920-mangle_bootargs.patch @@ -0,0 +1,71 @@ +From: Imre Kaloz <kaloz@openwrt.org> +Subject: init: add CONFIG_MANGLE_BOOTARGS and disable it by default + +Enabling this option renames the bootloader supplied root= +and rootfstype= variables, which might have to be know but +would break the automatisms OpenWrt uses. + +Signed-off-by: Imre Kaloz <kaloz@openwrt.org> +--- + init/Kconfig | 9 +++++++++ + init/main.c | 24 ++++++++++++++++++++++++ + 2 files changed, 33 insertions(+) + +--- a/init/Kconfig ++++ b/init/Kconfig +@@ -1427,6 +1427,15 @@ config EMBEDDED + an embedded system so certain expert options are available + for configuration. + ++config MANGLE_BOOTARGS ++ bool "Rename offending bootargs" ++ depends on EXPERT ++ help ++ Sometimes the bootloader passed bogus root= and rootfstype= ++ parameters to the kernel, and while you want to ignore them, ++ you need to know the values f.e. to support dual firmware ++ layouts on the flash. ++ + config HAVE_PERF_EVENTS + bool + help +--- a/init/main.c ++++ b/init/main.c +@@ -359,6 +359,29 @@ static inline void setup_nr_cpu_ids(void + static inline void smp_prepare_cpus(unsigned int maxcpus) { } + #endif + ++#ifdef CONFIG_MANGLE_BOOTARGS ++static void __init mangle_bootargs(char *command_line) ++{ ++ char *rootdev; ++ char *rootfs; ++ ++ rootdev = strstr(command_line, "root=/dev/mtdblock"); ++ ++ if (rootdev) ++ strncpy(rootdev, "mangled_rootblock=", 18); ++ ++ rootfs = strstr(command_line, "rootfstype"); ++ ++ if (rootfs) ++ strncpy(rootfs, "mangled_fs", 10); ++ ++} ++#else ++static void __init mangle_bootargs(char *command_line) ++{ ++} ++#endif ++ + /* + * We need to store the untouched command line for future reference. + * We also need to store the touched command line since the parameter +@@ -540,6 +563,7 @@ asmlinkage __visible void __init start_k + add_device_randomness(command_line, strlen(command_line)); + boot_init_stack_canary(); + mm_init_cpumask(&init_mm); ++ mangle_bootargs(command_line); + setup_command_line(command_line); + setup_nr_cpu_ids(); + setup_per_cpu_areas(); |