Package: sudo Version: 1.8.11p1-1 Severity: normal After upgrade to 1.8.11p1-1 from 1.3.10p3, sudo silently fails to execute any commands if the kernel is compiled with !AUDIT. For example, as root:
# sudo echo foo
#
Nothing in the logs indicate anything wrong either, even if the debug
level is set to diag; sudo just exits.
There is code that tries to handle this in
plugins/sudoers/linux_audit.c, but it fails miserably:
------------------------------------------------------------
if (au_fd == -1) {
/* Kernel may not have audit support. */
if (errno != EINVAL && errno != EPROTONOSUPPORT && errno != EAFNOSUPPORT) {
sudo_warn(U_("unable to open audit system"));
au_fd = AUDIT_NOT_CONFIGURED;
}
}
------------------------------------------------------------
Obviously, it should require errno to be *either* EINVAL,
EPROTONOTSUPPORT or EAFNOSUPPORT, not *all of them*.
After applying the attached patch, sudo no longer fails, but warns:
------------------------------------------------------------
# sudo echo foo
sudo: unable to open audit system: Protocol not supported
foo
------------------------------------------------------------
Sami
-- System Information:
Debian Release: jessie/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.17.0 (SMP w/8 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=fi_FI.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages sudo depends on:
ii libaudit1 1:2.4-1
ii libc6 2.19-11
ii libpam-modules 1.1.8-3.1
ii libpam0g 1.1.8-3.1
ii libselinux1 2.3-2
ii zlib1g 1:1.2.8.dfsg-2
sudo recommends no packages.
sudo suggests no packages.
-- Configuration Files:
/etc/sudoers [Errno 13] Permission denied: u'/etc/sudoers'
/etc/sudoers.d/README [Errno 13] Permission denied: u'/etc/sudoers.d/README'
-- no debconf information
Description: Make sudo work if kernel compiled with !AUDIT
The code in linux_audit.c tries to handle the case where the kernel
has been compiled without AUDIT support, but fails miserably.
Author: Sami Liedes <sami.lie...@iki.fi>
---
--- sudo-1.8.11p1.orig/plugins/sudoers/linux_audit.c
+++ sudo-1.8.11p1/plugins/sudoers/linux_audit.c
@@ -57,7 +57,7 @@ linux_audit_open(void)
au_fd = audit_open();
if (au_fd == -1) {
/* Kernel may not have audit support. */
- if (errno != EINVAL && errno != EPROTONOSUPPORT && errno != EAFNOSUPPORT) {
+ if (errno != EINVAL || errno != EPROTONOSUPPORT || errno != EAFNOSUPPORT) {
sudo_warn(U_("unable to open audit system"));
au_fd = AUDIT_NOT_CONFIGURED;
}
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