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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

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Pull integrity subsystem regression fix from James Morris:
 "Commit fdf90729e5 "ima: support new kernel module syscall" by error
  modified init_module() to return INTEGRITY_UNKNOWN (which is 4) to
  user space if the kernel was built with CONFIG_IMA_APPRAISE=y.

  As a result, user space can no longer load kernel modules using
  init_module().  This commit fixes this regression."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  ima: fallback to MODULE_SIG_ENFORCE for existing kernel module syscall
This commit is contained in:
Linus Torvalds 2013-01-07 07:37:36 -08:00
commit 7991b03d65
3 changed files with 11 additions and 5 deletions
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1
security/integrity/ima/ima.h
View File

@ -139,6 +139,7 @@ void ima_delete_rules(void);
/* Appraise integrity measurements */
#define IMA_APPRAISE_ENFORCE 0x01
#define IMA_APPRAISE_FIX 0x02
#define IMA_APPRAISE_MODULES 0x04
#ifdef CONFIG_IMA_APPRAISE
int ima_appraise_measurement(struct integrity_iint_cache *iint,

12
security/integrity/ima/ima_main.c
View File

@ -291,11 +291,15 @@ EXPORT_SYMBOL_GPL(ima_file_check);
*/
int ima_module_check(struct file *file)
{
int rc;
int rc = 0;
if (!file)
rc = INTEGRITY_UNKNOWN;
else
if (!file) {
if (ima_appraise & IMA_APPRAISE_MODULES) {
#ifndef CONFIG_MODULE_SIG_FORCE
rc = -EACCES; /* INTEGRITY_UNKNOWN */
#endif
}
} else
rc = process_measurement(file, file->f_dentry->d_name.name,
MAY_EXEC, MODULE_CHECK);
return (ima_appraise & IMA_APPRAISE_ENFORCE) ? rc : 0;

3
security/integrity/ima/ima_policy.c
View File

@ -523,7 +523,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
}
if (!result && (entry->action == UNKNOWN))
result = -EINVAL;
else if (entry->func == MODULE_CHECK)
ima_appraise |= IMA_APPRAISE_MODULES;
audit_log_format(ab, "res=%d", !result);
audit_log_end(ab);
return result;