lkml.org 
[lkml]   [2020]   [Jun]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 09/11] ima: Move validation of the keyrings conditional into ima_validate_rule()
Date
Use ima_validate_rule() to ensure that the combination of a hook
function and the keyrings conditional is valid and that the keyrings
conditional is not specified without an explicit KEY_CHECK func
conditional. This is a code cleanup and has no user-facing change.

Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
---

* v2
- Allowed IMA_DIGSIG_REQUIRED, IMA_PERMIT_DIRECTIO,
IMA_MODSIG_ALLOWED, and IMA_CHECK_BLACKLIST conditionals to be
present in the rule entry flags for non-buffer hook functions.

security/integrity/ima/ima_policy.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 8cdca2399d59..43d49ad958fb 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1000,6 +1000,15 @@ static bool ima_validate_rule(struct ima_rule_entry *entry)
case KEXEC_KERNEL_CHECK:
case KEXEC_INITRAMFS_CHECK:
case POLICY_CHECK:
+ if (entry->flags & ~(IMA_FUNC | IMA_MASK | IMA_FSMAGIC |
+ IMA_UID | IMA_FOWNER | IMA_FSUUID |
+ IMA_INMASK | IMA_EUID | IMA_PCR |
+ IMA_FSNAME | IMA_DIGSIG_REQUIRED |
+ IMA_PERMIT_DIRECTIO |
+ IMA_MODSIG_ALLOWED |
+ IMA_CHECK_BLACKLIST))
+ return false;
+
break;
case KEXEC_CMDLINE:
if (entry->action & ~(MEASURE | DONT_MEASURE))
@@ -1027,7 +1036,8 @@ static bool ima_validate_rule(struct ima_rule_entry *entry)
default:
return false;
}
- }
+ } else if (entry->flags & IMA_KEYRINGS)
+ return false;

return true;
}
@@ -1209,7 +1219,6 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
keyrings_len = strlen(args[0].from) + 1;

if ((entry->keyrings) ||
- (entry->func != KEY_CHECK) ||
(keyrings_len < 2)) {
result = -EINVAL;
break;
--
2.25.1
\
 
 \ /
  Last update: 2020-06-27 00:41    [W:0.164 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site