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authorMimi Zohar <zohar@linux.vnet.ibm.com>2018-07-13 14:06:00 -0400
committerJames Morris <james.morris@microsoft.com>2018-07-16 12:31:57 -0700
commitfed2512a7ccc8fc4b8e1de22925d127e4caac300 (patch)
treeff667da0a4a8e305409d7c5323c58c7852e40e3b /security/integrity
parent6e852651f28eee851069c7d40989281fae4bf9d2 (diff)
downloadlinux-stericsson-fed2512a7ccc8fc4b8e1de22925d127e4caac300.tar.gz
ima: based on policy require signed firmware (sysfs fallback)
With an IMA policy requiring signed firmware, this patch prevents the sysfs fallback method of loading firmware. Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Luis R. Rodriguez <mcgrof@suse.com> Cc: Matthew Garrett <mjg59@google.com> Signed-off-by: James Morris <james.morris@microsoft.com>
Diffstat (limited to 'security/integrity')
-rw-r--r--security/integrity/ima/ima_main.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 71fecfef0939..e467664965e7 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -472,8 +472,10 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
if (!file && read_id == READING_FIRMWARE) {
if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
- (ima_appraise & IMA_APPRAISE_ENFORCE))
+ (ima_appraise & IMA_APPRAISE_ENFORCE)) {
+ pr_err("Prevent firmware loading_store.\n");
return -EACCES; /* INTEGRITY_UNKNOWN */
+ }
return 0;
}
@@ -517,6 +519,12 @@ int ima_load_data(enum kernel_load_data_id id)
pr_err("impossible to appraise a kernel image without a file descriptor; try using kexec_file_load syscall.\n");
return -EACCES; /* INTEGRITY_UNKNOWN */
}
+ break;
+ case LOADING_FIRMWARE:
+ if (ima_appraise & IMA_APPRAISE_FIRMWARE) {
+ pr_err("Prevent firmware sysfs fallback loading.\n");
+ return -EACCES; /* INTEGRITY_UNKNOWN */
+ }
default:
break;
}