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bootconfig: Check the checksum before removing the bootconfig from initrd 

Check the bootconfig's checksum before removing the bootconfig data
from initrd to avoid modifying initrd by mistake.
This will also simplifies the get_boot_config_from_initrd() interface.

Link: https://lkml.kernel.org/r/164921226891.1090670.16955839243639298134.stgit@devnote2

Cc: Padmanabha Srinivasaiah <treasure4paddy@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Sami Tolvanen <samitolvanen@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2022-04-06 11:31:09 +09:00 committed by Steven Rostedt (Google)
parent 6014a23638
commit 765b8552a2
1 changed files with 10 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
init/main.c
View File

@ -266,7 +266,7 @@ static int __init loglevel(char *str)
early_param("loglevel", loglevel);
#ifdef CONFIG_BLK_DEV_INITRD
static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
static void * __init get_boot_config_from_initrd(u32 *_size)
{
u32 size, csum;
char *data;
@ -300,17 +300,20 @@ found:
return NULL;
}
if (xbc_calc_checksum(data, size) != csum) {
pr_err("bootconfig checksum failed\n");
return NULL;
}
/* Remove bootconfig from initramfs/initrd */
initrd_end = (unsigned long)data;
if (_size)
*_size = size;
if (_csum)
*_csum = csum;
return data;
}
#else
static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
static void * __init get_boot_config_from_initrd(u32 *_size)
{
return NULL;
}
@ -409,12 +412,12 @@ static void __init setup_boot_config(void)
static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
const char *msg;
int pos;
u32 size, csum;
u32 size;
char *data, *err;
int ret;
/* Cut out the bootconfig data even if we have no bootconfig option */
data = get_boot_config_from_initrd(&size, &csum);
data = get_boot_config_from_initrd(&size);
strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
@ -438,11 +441,6 @@ static void __init setup_boot_config(void)
return;
}
if (xbc_calc_checksum(data, size) != csum) {
pr_err("bootconfig checksum failed\n");
return;
}
ret = xbc_init(data, size, &msg, &pos);
if (ret < 0) {
if (pos < 0)
@ -471,7 +469,7 @@ static void __init exit_boot_config(void)
static void __init setup_boot_config(void)
{
/* Remove bootconfig data from initrd */
get_boot_config_from_initrd(NULL, NULL);
get_boot_config_from_initrd(NULL);
}
static int __init warn_bootconfig(char *str)