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2018-01-19scripts/gdb/linux/tasks.py: fix get_thread_infoXi Kangjie
2017-11-02License cleanup: add SPDX GPL-2.0 license identifier to files with no licenseGreg Kroah-Hartman
2017-09-01kbuild: use $(abspath ...) instead of $(shell cd ... && /bin/pwd)Masahiro Yamada
2017-07-12scripts/gdb: lx-dmesg: use explicit encoding=utf8 errors=replaceLeonard Crestez
2017-07-12scripts/gdb: lx-dmesg: cast log_buf to void* for addr fetchLeonard Crestez
2017-07-12scripts/gdb: add lx-fdtdump commandPeter Griffin
2017-06-02scripts/gdb: make lx-dmesg command work (reliably)André Draszik
2016-07-15Revert "scripts/gdb: add a Radix Tree Parser"Kieran Bingham
2016-07-15scripts/gdb: Perform path expansion to lx-symbol's argumentsNikolay Borisov
2016-07-15scripts/gdb: add constants.py to .gitignoreOmar Sandoval
2016-07-15scripts/gdb: rebuild constants.py on dependancy changeKieran Bingham
2016-07-15scripts/gdb: silence 'nothing to do' messageKieran Bingham
2016-05-23scripts/gdb: decode bytestream on dmesg for Python3Kieran Bingham
2016-05-23scripts/gdb: fix issue with dmesg.py and python 3.XDom Cote
2016-05-23scripts/gdb: improve types abstraction for gdb python scriptsDom Cote
2016-05-23scripts/gdb: add lx_thread_info_by_pid helperKieran Bingham
2016-05-23scripts/gdb: add a Radix Tree ParserKieran Bingham
2016-05-23scripts/gdb: cast CPU numbers to integerJan Kiszka
2016-05-23scripts/gdb: add cpu iteratorsKieran Bingham
2016-05-23scripts/gdb: add mount point list commandKieran Bingham
2016-05-23scripts/gdb: add io resource readersKieran Bingham
2016-05-23scripts/gdb: provide a dentry_name VFS path helperKieran Bingham
2016-05-23scripts/gdb: support !CONFIG_MODULES gracefullyKieran Bingham
2016-05-23scripts/gdb: provide exception catching parserKieran Bingham
2016-05-23scripts/gdb: convert modules usage to lists functionsKieran Bingham
2016-05-23scripts/gdb: provide kernel list item generatorsKieran Bingham
2016-05-23scripts/gdb: provide linux constantsKieran Bingham
2016-05-23scripts/gdb: Adjust module reference counter reported by lx-lsmodJan Kiszka
2016-03-22scripts/gdb: account for changes in module data structureJan Kiszka
2016-03-22scripts/gdb: add cmdline reader commandKieran Bingham
2016-03-22scripts/gdb: add version commandKieran Bingham
2015-06-30scripts/gdb: remove useless global instructionThiébaud Weksteen
2015-06-30scripts/gdb: add ps commandThiébaud Weksteen
2015-06-30scripts/gdb: fix PEP8 complianceThiébaud Weksteen
2015-06-30scripts/gdb: fix typo in exception nameThiébaud Weksteen
2015-06-30scripts/gdb: enable completion for lx-list-check parameterJan Kiszka
2015-06-30scripts/gdb: also allow list_head pointer as lx-list-check paramterJan Kiszka
2015-06-30scripts/gdb: add command to check list consistencyThiébaud Weksteen
2015-05-28scripts/gdb: fix lx-lsmod refcntAdrien Schildknecht
2015-02-28scripts/gdb: add empty package initialization scriptJan Kiszka
2015-02-17scripts/gdb: disable pagination while printing from breakpoint handlerJan Kiszka
2015-02-17scripts/gdb: convert CpuList to generator functionJan Kiszka
2015-02-17scripts/gdb: convert ModuleList to generator functionJan Kiszka
2015-02-17scripts/gdb: use a generator instead of iterator for task listDaniel Wagner
2015-02-17scripts/gdb: ignore byte-compiled python filesDaniel Thompson
2015-02-17scripts/gdb: port to python3 / gdb7.7Pantelis Koukousoulas
2015-02-17scripts/gdb: add lx-lsmod commandJan Kiszka
2015-02-17scripts/gdb: add class to iterate over CPU masksJan Kiszka
2015-02-17scripts/gdb: add lx_current convenience functionJan Kiszka
2015-02-17scripts/gdb: add internal helper and convenience function for per-cpu lookupJan Kiszka
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-10 10:08:13 +0000
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// SPDX-License-Identifier: GPL-2.0-or-later
/* audit_watch.c -- watching inodes
 *
 * Copyright 2003-2009 Red Hat, Inc.
 * Copyright 2005 Hewlett-Packard Development Company, L.P.
 * Copyright 2005 IBM Corporation
 */

#include <linux/file.h>
#include <linux/kernel.h>
#include <linux/audit.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
#include <linux/fs.h>
#include <linux/fsnotify_backend.h>
#include <linux/namei.h>
#include <linux/netlink.h>
#include <linux/refcount.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/security.h>
#include "audit.h"

/*
 * Reference counting:
 *
 * audit_parent: lifetime is from audit_init_parent() to receipt of an FS_IGNORED
 * 	event.  Each audit_watch holds a reference to its associated parent.
 *
 * audit_watch: if added to lists, lifetime is from audit_init_watch() to
 * 	audit_remove_watch().  Additionally, an audit_watch may exist
 * 	temporarily to assist in searching existing filter data.  Each
 * 	audit_krule holds a reference to its associated watch.
 */

struct audit_watch {
	refcount_t		count;	/* reference count */
	dev_t			dev;	/* associated superblock device */
	char			*path;	/* insertion path */
	unsigned long		ino;	/* associated inode number */
	struct audit_parent	*parent; /* associated parent */
	struct list_head	wlist;	/* entry in parent->watches list */
	struct list_head	rules;	/* anchor for krule->rlist */
};

struct audit_parent {
	struct list_head	watches; /* anchor for audit_watch->wlist */
	struct fsnotify_mark mark; /* fsnotify mark on the inode */
};

/* fsnotify handle. */
static struct fsnotify_group *audit_watch_group;

/* fsnotify events we care about. */
#define AUDIT_FS_WATCH (FS_MOVE | FS_CREATE | FS_DELETE | FS_DELETE_SELF |\
			FS_MOVE_SELF | FS_EVENT_ON_CHILD | FS_UNMOUNT)

static void audit_free_parent(struct audit_parent *parent)
{
	WARN_ON(!list_empty(&parent->watches));
	kfree(parent);
}

static void audit_watch_free_mark(struct fsnotify_mark *entry)
{
	struct audit_parent *parent;

	parent = container_of(entry, struct audit_parent, mark);
	audit_free_parent(parent);
}

static void audit_get_parent(struct audit_parent *parent)
{
	if (likely(parent))
		fsnotify_get_mark(&parent->mark);
}

static void audit_put_parent(struct audit_parent *parent)
{
	if (likely(parent))
		fsnotify_put_mark(&parent->mark);
}

/*
 * Find and return the audit_parent on the given inode.  If found a reference
 * is taken on this parent.
 */
static inline struct audit_parent *audit_find_parent(struct inode *inode)
{
	struct audit_parent *parent = NULL;
	struct fsnotify_mark *entry;

	entry = fsnotify_find_mark(&inode->i_fsnotify_marks, audit_watch_group);
	if (entry)
		parent = container_of(entry, struct audit_parent, mark);

	return parent;
}

void audit_get_watch(struct audit_watch *watch)
{
	refcount_inc(&watch->count);
}

void audit_put_watch(struct audit_watch *watch)
{
	if (refcount_dec_and_test(&watch->count)) {
		WARN_ON(watch->parent);
		WARN_ON(!list_empty(&watch->rules));
		kfree(watch->path);
		kfree(watch);
	}
}

static void audit_remove_watch(struct audit_watch *watch)
{
	list_del(&watch->wlist);
	audit_put_parent(watch->parent);
	watch->parent = NULL;
	audit_put_watch(watch); /* match initial get */
}

char *audit_watch_path(struct audit_watch *watch)
{
	return watch->path;
}

int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev)
{
	return (watch->ino != AUDIT_INO_UNSET) &&
		(watch->ino == ino) &&
		(watch->dev == dev);
}

/* Initialize a parent watch entry. */
static struct audit_parent *audit_init_parent(struct path *path)
{
	struct inode *inode = d_backing_inode(path->dentry);
	struct audit_parent *parent;
	int ret;

	parent = kzalloc(sizeof(*parent), GFP_KERNEL);
	if (unlikely(!parent))
		return ERR_PTR(-ENOMEM);

	INIT_LIST_HEAD(&parent->watches);

	fsnotify_init_mark(&parent->mark, audit_watch_group);
	parent->mark.mask = AUDIT_FS_WATCH;
	ret = fsnotify_add_inode_mark(&parent->mark, inode, 0);
	if (ret < 0) {
		audit_free_parent(parent);
		return ERR_PTR(ret);
	}

	return parent;
}

/* Initialize a watch entry. */
static struct audit_watch *audit_init_watch(char *path)
{
	struct audit_watch *watch;

	watch = kzalloc(sizeof(*watch), GFP_KERNEL);
	if (unlikely(!watch))
		return ERR_PTR(-ENOMEM);

	INIT_LIST_HEAD(&watch->rules);
	refcount_set(&watch->count, 1);
	watch->path = path;
	watch->dev = AUDIT_DEV_UNSET;
	watch->ino = AUDIT_INO_UNSET;

	return watch;
}

/* Translate a watch string to kernel representation. */
int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op)
{
	struct audit_watch *watch;

	if (!audit_watch_group)
		return -EOPNOTSUPP;

	if (path[0] != '/' || path[len-1] == '/' ||
	    krule->listnr != AUDIT_FILTER_EXIT ||
	    op != Audit_equal ||
	    krule->inode_f || krule->watch || krule->tree)
		return -EINVAL;

	watch = audit_init_watch(path);
	if (IS_ERR(watch))
		return PTR_ERR(watch);

	krule->watch = watch;

	return 0;
}

/* Duplicate the given audit watch.  The new watch's rules list is initialized
 * to an empty list and wlist is undefined. */
static struct audit_watch *audit_dupe_watch(struct audit_watch *old)
{
	char *path;
	struct audit_watch *new;

	path = kstrdup(old->path, GFP_KERNEL);
	if (unlikely(!path))
		return ERR_PTR(-ENOMEM);

	new = audit_init_watch(path);
	if (IS_ERR(new)) {
		kfree(path);
		goto out;
	}

	new->dev = old->dev;
	new->ino = old->ino;
	audit_get_parent(old->parent);
	new->parent = old->parent;

out:
	return new;
}

static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watch *w, char *op)
{
	struct audit_buffer *ab;

	if (!audit_enabled)
		return;
	ab = audit_log_start(audit_context(), GFP_NOFS, AUDIT_CONFIG_CHANGE);
	if (!ab)
		return;
	audit_log_session_info(ab);
	audit_log_format(ab, "op=%s path=", op);
	audit_log_untrustedstring(ab, w->path);
	audit_log_key(ab, r->filterkey);
	audit_log_format(ab, " list=%d res=1", r->listnr);
	audit_log_end(ab);
}

/* Update inode info in audit rules based on filesystem event. */
static void audit_update_watch(struct audit_parent *parent,
			       const struct qstr *dname, dev_t dev,
			       unsigned long ino, unsigned invalidating)
{
	struct audit_watch *owatch, *nwatch, *nextw;
	struct audit_krule *r, *nextr;
	struct audit_entry *oentry, *nentry;

	mutex_lock(&audit_filter_mutex);
	/* Run all of the watches on this parent looking for the one that
	 * matches the given dname */
	list_for_each_entry_safe(owatch, nextw