50 lines
1.9 KiB
Diff
50 lines
1.9 KiB
Diff
From 3cef4110bee88ac81dfb5e62c2a8b7902248abba Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>
|
|
Date: Mon, 10 May 2021 12:56:48 +0200
|
|
Subject: [PATCH] libselinux: do not use status page fallback mode internally
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
Currently `avc_init_internal()`, called by `avc_open(3)` and
|
|
`avc_init(3)`, does open the SELinux status page with fallback mode
|
|
enabled.
|
|
|
|
Quote from man:selinux_status_open(3):
|
|
In this case, this function tries to open a netlink socket using
|
|
.BR avc_netlink_open (3) and overwrite corresponding callbacks
|
|
(setenforce and policyload). Thus, we need to pay attention to the
|
|
interaction with these interfaces, when fallback mode is enabled.
|
|
|
|
Calling `selinux_status_open` internally in fallback mode is bad, cause
|
|
it overrides callbacks from client applications or the internal
|
|
fallback-callbacks get overridden by client applications.
|
|
Note that `avc_open(3)` gets called under the hood by
|
|
`selinux_check_access(3)` without checking for failure.
|
|
Also the status page is available since Linux 2.6.37, so failures of
|
|
`selinux_status_open(3)` in non-fallback mode should only be caused by
|
|
policies not allowing the client process to open/read/map
|
|
the /sys/fs/selinux/status file.
|
|
|
|
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
|
|
---
|
|
libselinux/src/avc.c | 2 +-
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
|
|
|
diff --git a/libselinux/src/avc.c b/libselinux/src/avc.c
|
|
index 8314d7ba3de6..daaedbc6a6fd 100644
|
|
--- a/libselinux/src/avc.c
|
|
+++ b/libselinux/src/avc.c
|
|
@@ -214,7 +214,7 @@ static int avc_init_internal(const char *prefix,
|
|
avc_enforcing = rc;
|
|
}
|
|
|
|
- rc = selinux_status_open(1);
|
|
+ rc = selinux_status_open(0);
|
|
if (rc < 0) {
|
|
avc_log(SELINUX_ERROR,
|
|
"%s: could not open selinux status page: %d (%s)\n",
|
|
--
|
|
2.32.0
|
|
|