3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Paul Moore <pmoore@xxxxxxxxxx>
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 <rgb@xxxxxxxxxx>
Signed-off-by: Paul Moore <pmoore@xxxxxxxxxx>
Acked-by: Eric Paris <eparis@xxxxxxxxxx>
Reviewed-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/auditfilter.c | 13 -------------
1 file changed, 13 deletions(-)
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -444,19 +444,6 @@ static struct audit_entry *audit_data_to
f->val = 0;
}
- if ((f->type == AUDIT_PID) || (f->type == AUDIT_PPID)) {
- struct pid *pid;
- rcu_read_lock();
- pid = find_vpid(f->val);
- if (!pid) {
- rcu_read_unlock();
- err = -ESRCH;
- goto exit_free;
- }
- f->val = pid_nr(pid);
- rcu_read_unlock();
- }
-
err = audit_field_valid(entry, f);
if (err)
goto exit_free;
--
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