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Subject[PATCH v2 7/9] ima: based on policy require signed firmware (sysfs fallback)
Date
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>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Matthew Garrett <mjg59@google.com>
---
security/integrity/ima/ima_main.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 7e1a127f18fe..29d1a929af5c 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -451,7 +451,17 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id)
}
return 0;
}
+
+ if (read_id == READING_FIRMWARE_FALLBACK_SYSFS) {
+ if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
+ (ima_appraise & IMA_APPRAISE_ENFORCE)) {
+ pr_err("Prevent firmware sysfs fallback loading.\n");
+ return -EACCES;
+ }
+ return 0;
+ }
return 0;
+
}

static int read_idmap[READING_MAX_ID] = {
--
2.7.5
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