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init/main.c: Alloc initcall_command_line in do_initcall() and free it

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Since initcall_command_line is used as a temporary buffer,
it could be freed after usage. Allocate it in do_initcall()
and free it after used.

Link: http://lkml.kernel.org/r/157867227145.17873.17513760552008505454.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2020-01-11 01:04:31 +09:00 committed by Steven Rostedt (VMware)
parent c1a3c36017
commit 0068c92a92
1 changed files with 15 additions and 11 deletions
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26
init/main.c
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@ -137,8 +137,6 @@ char __initdata boot_command_line[COMMAND_LINE_SIZE];
char *saved_command_line;
/* Command line for parameter parsing */
static char *static_command_line;
/* Command line for per-initcall parameter parsing */
static char *initcall_command_line;
static char *execute_command;
static char *ramdisk_execute_command;
@ -433,10 +431,6 @@ static void __init setup_command_line(char *command_line)
if (!saved_command_line)
panic("%s: Failed to allocate %zu bytes\n", __func__, len);
initcall_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
if (!initcall_command_line)
panic("%s: Failed to allocate %zu bytes\n", __func__, len);
static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
if (!static_command_line)
panic("%s: Failed to allocate %zu bytes\n", __func__, len);
@ -1044,13 +1038,12 @@ static const char *initcall_level_names[] __initdata = {
"late",
};
static void __init do_initcall_level(int level)
static void __init do_initcall_level(int level, char *command_line)
{
initcall_entry_t *fn;
strcpy(initcall_command_line, saved_command_line);
parse_args(initcall_level_names[level],
initcall_command_line, __start___param,
command_line, __start___param,
__stop___param - __start___param,
level, level,
NULL, &repair_env_string);
@ -1063,9 +1056,20 @@ static void __init do_initcall_level(int level)
static void __init do_initcalls(void)
{
int level;
size_t len = strlen(saved_command_line) + 1;
char *command_line;
for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
do_initcall_level(level);
command_line = kzalloc(len, GFP_KERNEL);
if (!command_line)
panic("%s: Failed to allocate %zu bytes\n", __func__, len);
for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
/* Parser modifies command_line, restore it each time */
strcpy(command_line, saved_command_line);
do_initcall_level(level, command_line);
}
kfree(command_line);
}
/*