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authorMasami Hiramatsu <mhiramat@kernel.org>2020-01-10 19:04:31 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-01-13 21:19:39 +0300
commit0068c92a92707789b8711e40d584a2433481a29d (patch)
tree311dd6449f4e3bd31ccd843ca36da0d342a85610 /init/main.c
parentc1a3c36017d4c4a4c61aa5f86704b7e80b92d3f7 (diff)
downloadlinux-0068c92a92707789b8711e40d584a2433481a29d.tar.xz
init/main.c: Alloc initcall_command_line in do_initcall() and free it
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>
Diffstat (limited to 'init/main.c')
-rw-r--r--init/main.c26
1 files changed, 15 insertions, 11 deletions
diff --git a/init/main.c b/init/main.c
index 59c418a57f92..0b4e0c8ccf16 100644
--- a/init/main.c
+++ b/init/main.c
@@ -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;
+
+ 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);
+ }
- for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
- do_initcall_level(level);
+ kfree(command_line);
}
/*