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9044e6bca5
We should not send a pile of replies while holding audit_netlink_mutex since we hold the same mutex when we receive commands. As the result, we can get blocked while sending and sit there holding the mutex while auditctl is unable to send the next command and get around to receiving what we'd sent. Solution: create skb and put them into a queue instead of sending; once we are done, send what we've got on the list. The former can be done synchronously while we are handling AUDIT_LIST or AUDIT_LIST_RULES; we are holding audit_netlink_mutex at that point. The latter is done asynchronously and without messing with audit_netlink_mutex. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/* audit -- definition of audit_context structure and supporting types
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*
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* Copyright 2003-2004 Red Hat, Inc.
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* Copyright 2005 Hewlett-Packard Development Company, L.P.
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* Copyright 2005 IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/mutex.h>
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#include <linux/fs.h>
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#include <linux/audit.h>
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#include <linux/skbuff.h>
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/* 0 = no checking
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1 = put_count checking
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2 = verbose put_count checking
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*/
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#define AUDIT_DEBUG 0
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/* At task start time, the audit_state is set in the audit_context using
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a per-task filter. At syscall entry, the audit_state is augmented by
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the syscall filter. */
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enum audit_state {
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AUDIT_DISABLED, /* Do not create per-task audit_context.
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* No syscall-specific audit records can
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* be generated. */
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AUDIT_SETUP_CONTEXT, /* Create the per-task audit_context,
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* but don't necessarily fill it in at
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* syscall entry time (i.e., filter
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* instead). */
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AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
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* and always fill it in at syscall
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* entry time. This makes a full
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* syscall record available if some
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* other part of the kernel decides it
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* should be recorded. */
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AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
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* always fill it in at syscall entry
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* time, and always write out the audit
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* record at syscall exit time. */
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};
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/* Rule lists */
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struct audit_field {
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u32 type;
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u32 val;
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u32 op;
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char *se_str;
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struct selinux_audit_rule *se_rule;
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};
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struct audit_krule {
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int vers_ops;
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u32 flags;
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u32 listnr;
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u32 action;
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u32 mask[AUDIT_BITMASK_SIZE];
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u32 buflen; /* for data alloc on list rules */
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u32 field_count;
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struct audit_field *fields;
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};
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struct audit_entry {
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struct list_head list;
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struct rcu_head rcu;
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struct audit_krule rule;
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};
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extern int audit_pid;
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extern int audit_comparator(const u32 left, const u32 op, const u32 right);
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extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
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int done, int multi,
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void *payload, int size);
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extern void audit_send_reply(int pid, int seq, int type,
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int done, int multi,
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void *payload, int size);
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extern void audit_log_lost(const char *message);
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extern void audit_panic(const char *message);
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extern struct mutex audit_netlink_mutex;
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struct audit_netlink_list {
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int pid;
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struct sk_buff_head q;
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};
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int audit_send_list(void *);
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extern int selinux_audit_rule_update(void);
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