diff mbox series

[PATCHv2,33/59] keys/mktme: Require CAP_SYS_RESOURCE capability for MKTME keys

Message ID 20190731150813.26289-34-kirill.shutemov@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series Intel MKTME enabling | expand

Commit Message

Kirill A. Shutemov July 31, 2019, 3:07 p.m. UTC 
From: Alison Schofield <alison.schofield@intel.com>

The MKTME key type uses capabilities to restrict the allocation
of keys to privileged users. CAP_SYS_RESOURCE is required, but
the broader capability of CAP_SYS_ADMIN is accepted.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 security/keys/mktme_keys.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/security/keys/mktme_keys.c b/security/keys/mktme_keys.c
index 1e2afcce7d85..2d90cc83e5ce 100644
--- a/security/keys/mktme_keys.c
+++ b/security/keys/mktme_keys.c
@@ -2,6 +2,7 @@ 
 
 /* Documentation/x86/mktme/ */
 
+#include <linux/cred.h>
 #include <linux/cpu.h>
 #include <linux/init.h>
 #include <linux/key.h>
@@ -371,6 +372,9 @@  int mktme_preparse_payload(struct key_preparsed_payload *prep)
 	char *options;
 	int ret;
 
+	if (!capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
 	if (datalen <= 0 || datalen > 1024 || !prep->data)
 		return -EINVAL;