lkml.org 
[lkml]   [2021]   [Nov]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v8 04/17] integrity: Do not allow machine keyring updates following init
Date
The machine keyring is setup during init.  No additional keys should be
allowed to be added afterwards. Leave the permission as read only.

Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
---
v2: Initial version
v4: Unmodified from v2
v5: Rename to machine keyring
v6: Add additional comment (suggested by Jarkko)
v7: Unmodified from v6
v8: Code unmodified from v7 added Mimi's Reviewed-by
---
security/integrity/digsig.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index 8c315be8ad99..910fe29a5037 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -140,7 +140,13 @@ int __init integrity_init_keyring(const unsigned int id)
return -ENOMEM;

restriction->check = restrict_link_to_ima;
- perm |= KEY_USR_WRITE;
+
+ /*
+ * No additional keys shall be allowed to load into the machine
+ * keyring following init
+ */
+ if (id != INTEGRITY_KEYRING_MACHINE)
+ perm |= KEY_USR_WRITE;

out:
return __integrity_init_keyring(id, perm, restriction);
--
2.18.4
\
 
 \ /
  Last update: 2021-11-24 05:43    [W:0.883 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site