linux-stable.git/kernel/auditfilter.c, branch v3.16.67

audit: restore AUDIT_LOGINUID unset ABI

2015-01-15T10:44:46+00:00

commit 041d7b98ffe59c59fdd639931dea7d74f9aa9a59 upstream.

A regression was caused by commit 780a7654cee8:
	 audit: Make testing for a valid loginuid explicit.
(which in turn attempted to fix a regression caused by e1760bd)

When audit_krule_to_data() fills in the rules to get a listing, there was a
missing clause to convert back from AUDIT_LOGINUID_SET to AUDIT_LOGINUID.

This broke userspace by not returning the same information that was sent and
expected.

The rule:
	auditctl -a exit,never -F auid=-1
gives:
	auditctl -l
		LIST_RULES: exit,never f24=0 syscall=all
when it should give:
		LIST_RULES: exit,never auid=-1 (0xffffffff) syscall=all

Tag it so that it is reported the same way it was set.  Create a new
private flags audit_krule field (pflags) to store it that won't interact with
the public one from the API.

Signed-off-by: Richard Guy Briggs 
Signed-off-by: Paul Moore 
Signed-off-by: Luis Henriques

audit: don't attempt to lookup PIDs when changing PID filtering audit rules

2015-01-15T10:44:42+00:00

commit 3640dcfa4fd00cd91d88bb86250bdb496f7070c0 upstream.

Commit f1dc4867 ("audit: anchor all pid references in the initial pid
namespace") introduced a find_vpid() call when adding/removing audit
rules with PID/PPID filters; unfortunately this is problematic as
find_vpid() only works if there is a task with the associated PID
alive on the system.  The following commands demonstrate a simple
reproducer.

	# auditctl -D
	# auditctl -l
	# autrace /bin/true
	# auditctl -l

This patch resolves the problem by simply using the PID provided by
the user without any additional validation, e.g. no calls to check to
see if the task/PID exists.

Cc: Richard Guy Briggs 
Signed-off-by: Paul Moore 
Acked-by: Eric Paris 
Reviewed-by: Richard Guy Briggs 
Signed-off-by: Luis Henriques

Merge git://git.infradead.org/users/eparis/audit

2014-04-12T19:38:53+00:00

Pull audit updates from Eric Paris.

* git://git.infradead.org/users/eparis/audit: (28 commits)
  AUDIT: make audit_is_compat depend on CONFIG_AUDIT_COMPAT_GENERIC
  audit: renumber AUDIT_FEATURE_CHANGE into the 1300 range
  audit: do not cast audit_rule_data pointers pointlesly
  AUDIT: Allow login in non-init namespaces
  audit: define audit_is_compat in kernel internal header
  kernel: Use RCU_INIT_POINTER(x, NULL) in audit.c
  sched: declare pid_alive as inline
  audit: use uapi/linux/audit.h for AUDIT_ARCH declarations
  syscall_get_arch: remove useless function arguments
  audit: remove stray newline from audit_log_execve_info() audit_panic() call
  audit: remove stray newlines from audit_log_lost messages
  audit: include subject in login records
  audit: remove superfluous new- prefix in AUDIT_LOGIN messages
  audit: allow user processes to log from another PID namespace
  audit: anchor all pid references in the initial pid namespace
  audit: convert PPIDs to the inital PID namespace.
  pid: get pid_t ppid of task in init_pid_ns
  audit: rename the misleading audit_get_context() to audit_take_context()
  audit: Add generic compat syscall support
  audit: Add CONFIG_HAVE_ARCH_AUDITSYSCALL
  ...

audit: do not cast audit_rule_data pointers pointlesly

2014-04-02T19:55:14+00:00

For some sort of legacy support audit_rule is a subset of (and first
entry in) audit_rule_data.  We don't actually need or use audit_rule.
We just do a cast from one to the other for no gain what so ever.  Stop
the crazy casting.

Signed-off-by: Eric Paris

audit: anchor all pid references in the initial pid namespace

2014-03-20T14:11:55+00:00

Store and log all PIDs with reference to the initial PID namespace and
use the access functions task_pid_nr() and task_tgid_nr() for task->pid
and task->tgid.

Cc: "Eric W. Biederman" 
(informed by ebiederman's c776b5d2)
Signed-off-by: Richard Guy Briggs

audit: Send replies in the proper network namespace.

2014-03-20T14:11:02+00:00

In perverse cases of file descriptor passing the current network
namespace of a process and the network namespace of a socket used by
that socket may differ.  Therefore use the network namespace of the
appropiate socket to ensure replies always go to the appropiate
socket.

Signed-off-by: "Eric W. Biederman" 
Acked-by: Richard Guy Briggs 
Signed-off-by: Eric Paris

audit: Use struct net not pid_t to remember the network namespce to reply in

2014-03-20T14:10:53+00:00

While reading through 3.14-rc1 I found a pretty siginficant mishandling
of network namespaces in the recent audit changes.

In struct audit_netlink_list and audit_reply add a reference to the
network namespace of the caller and remove the userspace pid of the
caller.  This cleanly remembers the callers network namespace, and
removes a huge class of races and nasty failure modes that can occur
when attempting to relook up the callers network namespace from a pid_t
(including the caller's network namespace changing, pid wraparound, and
the pid simply not being present).

Signed-off-by: "Eric W. Biederman" 
Acked-by: Richard Guy Briggs 
Signed-off-by: Eric Paris

audit: Update kdoc for audit_send_reply and audit_list_rules_send

2014-03-08T23:31:54+00:00

The kbuild test robot reported:
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-next
> head:   6f285b19d09f72e801525f5eea1bdad22e559bf0
> commit: 6f285b19d09f72e801525f5eea1bdad22e559bf0 [2/2] audit: Send replies in the proper network namespace.
> reproduce: make htmldocs
>
> >> Warning(kernel/audit.c:575): No description found for parameter 'request_skb'
> >> Warning(kernel/audit.c:575): Excess function parameter 'portid' description in 'audit_send_reply'
> >> Warning(kernel/auditfilter.c:1074): No description found for parameter 'request_skb'
> >> Warning(kernel/auditfilter.c:1074): Excess function parameter 'portid' description in 'audit_list_rules_s

Which was caused by my failure to update the kdoc annotations when I
updated the functions.  Fix that small oversight now.

Signed-off-by: "Eric W. Biederman"

audit: Use more current logging style again

2014-03-07T16:48:15+00:00

Add pr_fmt to prefix "audit: " to output
Convert printk(KERN_ to pr_
Coalesce formats

Signed-off-by: Richard Guy Briggs

audit: Send replies in the proper network namespace.

2014-03-01T03:44:55+00:00

In perverse cases of file descriptor passing the current network
namespace of a process and the network namespace of a socket used by
that socket may differ.  Therefore use the network namespace of the
appropiate socket to ensure replies always go to the appropiate
socket.

Signed-off-by: "Eric W. Biederman"