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authorArd Biesheuvel <ardb@kernel.org>2020-10-13 10:18:04 +0200
committerMimi Zohar <zohar@linux.ibm.com>2020-11-02 14:19:01 -0500
commitb000d5cb954fe25ac1ea929ae6da321033ace927 (patch)
treea062e8d69d89dca1e185bbb0cd417073a29d4fdd /security
parent3cea11cd5e3b00d91caf0b4730194039b45c5891 (diff)
downloadlinux-b000d5cb954fe25ac1ea929ae6da321033ace927.tar.bz2
ima: defer arch_ima_get_secureboot() call to IMA init time
Chester reports that it is necessary to introduce a new way to pass the EFI secure boot status between the EFI stub and the core kernel on ARM systems. The usual way of obtaining this information is by checking the SecureBoot and SetupMode EFI variables, but this can only be done after the EFI variable workqueue is created, which occurs in a subsys_initcall(), whereas arch_ima_get_secureboot() is called much earlier by the IMA framework. However, the IMA framework itself is started as a late_initcall, and the only reason the call to arch_ima_get_secureboot() occurs so early is because it happens in the context of a __setup() callback that parses the ima_appraise= command line parameter. So let's refactor this code a little bit, by using a core_param() callback to capture the command line argument, and deferring any reasoning based on its contents to the IMA init routine. Cc: Chester Lin <clin@suse.com> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: James Morris <jmorris@namei.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Link: https://lore.kernel.org/linux-arm-kernel/20200904072905.25332-2-clin@suse.com/ Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reported-by: kernel test robot <lkp@intel.com> [missing core_param()] [zohar@linux.ibm.com: included linux/module.h] Tested-by: Chester Lin <clin@suse.com> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'security')
-rw-r--r--security/integrity/ima/ima_appraise.c17
-rw-r--r--security/integrity/ima/ima_main.c1
2 files changed, 12 insertions, 6 deletions
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 3dd8c2e4314e..8361941ee0a1 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -5,6 +5,7 @@
* Author:
* Mimi Zohar <zohar@us.ibm.com>
*/
+#include <linux/module.h>
#include <linux/init.h>
#include <linux/file.h>
#include <linux/fs.h>
@@ -16,12 +17,19 @@
#include "ima.h"
-static int __init default_appraise_setup(char *str)
-{
#ifdef CONFIG_IMA_APPRAISE_BOOTPARAM
+static char *ima_appraise_cmdline_default __initdata;
+core_param(ima_appraise, ima_appraise_cmdline_default, charp, 0);
+
+void __init ima_appraise_parse_cmdline(void)
+{
+ const char *str = ima_appraise_cmdline_default;
bool sb_state = arch_ima_get_secureboot();
int appraisal_state = ima_appraise;
+ if (!str)
+ return;
+
if (strncmp(str, "off", 3) == 0)
appraisal_state = 0;
else if (strncmp(str, "log", 3) == 0)
@@ -42,11 +50,8 @@ static int __init default_appraise_setup(char *str)
} else {
ima_appraise = appraisal_state;
}
-#endif
- return 1;
}
-
-__setup("ima_appraise=", default_appraise_setup);
+#endif
/*
* is_ima_appraise_enabled - return appraise status
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 2d1af8899cab..a962b23e0429 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -904,6 +904,7 @@ static int __init init_ima(void)
{
int error;
+ ima_appraise_parse_cmdline();
ima_init_template_list();
hash_setup(CONFIG_IMA_DEFAULT_HASH);
error = ima_init();