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Subject[PATCH 2/3] apparmor: move to per loaddata files, instead of replicating in profiles
Date
The loaddata sets cover more than just a single profile and should
be tracked at the ns level. Move the load data files under the namespace
and reference the files from the profiles via a symlink.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Reviewed-by: Seth Arnold <seth.arnold@canonical.com>
---
security/apparmor/apparmorfs.c | 288 ++++++++++++++++++++++++------
security/apparmor/include/apparmorfs.h | 5 +
security/apparmor/include/policy_ns.h | 4 +
security/apparmor/include/policy_unpack.h | 67 ++++++-
security/apparmor/policy.c | 42 ++++-
security/apparmor/policy_ns.c | 2 +
security/apparmor/policy_unpack.c | 49 ++++-
7 files changed, 393 insertions(+), 64 deletions(-)

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 6d1a4a67abce..5a6010007046 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -101,10 +101,10 @@ static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
data = kvmalloc(sizeof(*data) + alloc_size);
if (data == NULL)
return ERR_PTR(-ENOMEM);
+ memset(data, 0, sizeof(*data));
kref_init(&data->count);
+ INIT_LIST_HEAD(&data->list);
data->size = copy_size;
- data->hash = NULL;
- data->abi = 0;

if (copy_from_user(data->data, userbuf, copy_size)) {
kvfree(data);
@@ -559,68 +559,92 @@ static const struct file_operations aa_fs_ns_name = {
.release = single_release,
};

-static int rawdata_release(struct inode *inode, struct file *file)
+
+/* policy/raw_data/ * file ops */
+
+#define SEQ_RAWDATA_FOPS(NAME) \
+static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
+{ \
+ return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
+} \
+ \
+static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
+ .owner = THIS_MODULE, \
+ .open = seq_rawdata_ ##NAME ##_open, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = seq_rawdata_release, \
+} \
+
+static int seq_rawdata_open(struct inode *inode, struct file *file,
+ int (*show)(struct seq_file *, void *))
{
- /* TODO: switch to loaddata when profile switched to symlink */
- aa_put_loaddata(file->private_data);
+ struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
+ int error;

- return 0;
+ if (!data)
+ /* lost race this ent is being reaped */
+ return -ENOENT;
+
+ error = single_open(file, show, data);
+ if (error) {
+ file->private_data = NULL;
+ aa_put_loaddata(data);
+ }
+
+ return error;
}

-static int aa_fs_seq_raw_abi_show(struct seq_file *seq, void *v)
+static int seq_rawdata_release(struct inode *inode, struct file *file)
{
- struct aa_proxy *proxy = seq->private;
- struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
+ struct seq_file *seq = (struct seq_file *) file->private_data;

- if (profile->rawdata->abi)
- seq_printf(seq, "v%d\n", profile->rawdata->abi);
+ if (seq)
+ aa_put_loaddata(seq->private);
+ return single_release(inode, file);
+}

- aa_put_profile(profile);
+static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
+{
+ struct aa_loaddata *data = seq->private;
+
+ if (data->abi) {
+ seq_printf(seq, "v%d", data->abi);
+ seq_puts(seq, "\n");
+ }

return 0;
}

-static int aa_fs_seq_raw_abi_open(struct inode *inode, struct file *file)
+static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
{
- return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_abi_show);
-}
+ struct aa_loaddata *data = seq->private;

-static const struct file_operations aa_fs_seq_raw_abi_fops = {
- .owner = THIS_MODULE,
- .open = aa_fs_seq_raw_abi_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = aa_fs_seq_profile_release,
-};
+ if (data->revision) {
+ seq_printf(seq, "%ld", data->revision);
+ seq_puts(seq, "\n");
+ }
+
+ return 0;
+}

-static int aa_fs_seq_raw_hash_show(struct seq_file *seq, void *v)
+static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
{
- struct aa_proxy *proxy = seq->private;
- struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
+ struct aa_loaddata *data = seq->private;
unsigned int i, size = aa_hash_size();

- if (profile->rawdata->hash) {
+ if (data->hash) {
for (i = 0; i < size; i++)
- seq_printf(seq, "%.2x", profile->rawdata->hash[i]);
- seq_putc(seq, '\n');
+ seq_printf(seq, "%.2x", data->hash[i]);
+ seq_puts(seq, "\n");
}
- aa_put_profile(profile);

return 0;
}

-static int aa_fs_seq_raw_hash_open(struct inode *inode, struct file *file)
-{
- return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_hash_show);
-}
-
-static const struct file_operations aa_fs_seq_raw_hash_fops = {
- .owner = THIS_MODULE,
- .open = aa_fs_seq_raw_hash_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = aa_fs_seq_profile_release,
-};
+SEQ_RAWDATA_FOPS(abi);
+SEQ_RAWDATA_FOPS(revision);
+SEQ_RAWDATA_FOPS(hash);

static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
loff_t *ppos)
@@ -631,27 +655,123 @@ static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
rawdata->size);
}

+static int rawdata_release(struct inode *inode, struct file *file)
+{
+ aa_put_loaddata(file->private_data);
+
+ return 0;
+}
+
static int rawdata_open(struct inode *inode, struct file *file)
{
- struct aa_proxy *proxy = inode->i_private;
- struct aa_profile *profile;
+ struct aa_loaddata *rawdata;

if (!policy_view_capable(NULL))
return -EACCES;
- profile = aa_get_profile_rcu(&proxy->profile);
- file->private_data = aa_get_loaddata(profile->rawdata);
- aa_put_profile(profile);
+ rawdata = __aa_get_loaddata(inode->i_private);
+ if (!rawdata)
+ /* lost race: this entry is being reaped */
+ return -ENOENT;
+ file->private_data = rawdata;

return 0;
}

-static const struct file_operations aa_fs_rawdata_fops = {
+static const struct file_operations rawdata_fops = {
.open = rawdata_open,
.read = rawdata_read,
.llseek = generic_file_llseek,
.release = rawdata_release,
};

+static void remove_rawdata_dents(struct aa_loaddata *rawdata)
+{
+ int i;
+
+ for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
+ if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
+ /* no refcounts on i_private */
+ securityfs_remove(rawdata->dents[i]);
+ rawdata->dents[i] = NULL;
+ }
+ }
+}
+
+void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
+{
+ AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
+
+ if (rawdata->ns) {
+ remove_rawdata_dents(rawdata);
+ list_del_init(&rawdata->list);
+ aa_put_ns(rawdata->ns);
+ rawdata->ns = NULL;
+ }
+}
+
+int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
+{
+ struct dentry *dent, *dir;
+
+ AA_BUG(!ns);
+ AA_BUG(!rawdata);
+ AA_BUG(!mutex_is_locked(&ns->lock));
+ AA_BUG(!ns_subdata_dir(ns));
+
+ /*
+ * just use ns revision dir was originally created at. This is
+ * under ns->lock and if load is successful revision will be
+ * bumped and is guaranteed to be unique
+ */
+ rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
+ if (!rawdata->name)
+ /* ->name freed when rawdata freed */
+ return -ENOMEM;
+
+ dir = securityfs_create_dir(rawdata->name, ns_subdata_dir(ns));
+ if (IS_ERR(dir))
+ return PTR_ERR(dir);
+ rawdata->dents[AAFS_LOADDATA_DIR] = dir;
+
+ dent = securityfs_create_file("abi", S_IFREG | 0444, dir, rawdata,
+ &seq_rawdata_abi_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ rawdata->dents[AAFS_LOADDATA_ABI] = dent;
+
+ dent = securityfs_create_file("revision", S_IFREG | 0444, dir, rawdata,
+ &seq_rawdata_revision_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
+
+ if (aa_g_hash_policy) {
+ dent = securityfs_create_file("sha1", S_IFREG | 0444, dir,
+ rawdata, &seq_rawdata_hash_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ rawdata->dents[AAFS_LOADDATA_HASH] = dent;
+ }
+
+ dent = securityfs_create_file("raw_data", S_IFREG | 0444,
+ dir, rawdata, &rawdata_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ rawdata->dents[AAFS_LOADDATA_DATA] = dent;
+ d_inode(dent)->i_size = rawdata->size;
+
+ rawdata->ns = aa_get_ns(ns);
+ list_add(&rawdata->list, &ns->rawdata_list);
+ /* no refcount on inode rawdata */
+
+ return 0;
+
+fail:
+ remove_rawdata_dents(rawdata);
+
+ return PTR_ERR(dent);
+}
+
/** fns to setup dynamic per profile/namespace files **/
void __aa_fs_profile_rmdir(struct aa_profile *profile)
{
@@ -703,7 +823,41 @@ static struct dentry *create_profile_file(struct dentry *dir, const char *name,
return dent;
}

-/* requires lock be held */
+static int profile_depth(struct aa_profile *profile)
+{
+ int depth = 0;
+
+ rcu_read_lock();
+ for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
+ depth++;
+ rcu_read_unlock();
+
+ return depth;
+}
+
+static int gen_symlink_name(char *buffer, size_t bsize, int depth,
+ const char *dirname, const char *fname)
+{
+ int error;
+
+ for (; depth > 0; depth--) {
+ if (bsize < 7)
+ return -ENAMETOOLONG;
+ strcpy(buffer, "../../");
+ buffer += 6;
+ bsize -= 6;
+ }
+
+ error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname);
+ if (error >= bsize || error < 0)
+ return -ENAMETOOLONG;
+
+ return 0;
+}
+
+/*
+ * Requires: @profile->ns->lock held
+ */
int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
{
struct aa_profile *child;
@@ -764,26 +918,34 @@ int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
}

if (profile->rawdata) {
- dent = create_profile_file(dir, "raw_sha1", profile,
- &aa_fs_seq_raw_hash_fops);
+ char target[64];
+ int depth = profile_depth(profile);
+ error = gen_symlink_name(target, sizeof(target), depth,
+ profile->rawdata->name, "sha1");
+ if (error < 0)
+ goto fail2;
+ dent = securityfs_create_symlink("raw_sha1", dir, target, NULL);
if (IS_ERR(dent))
goto fail;
profile->dents[AAFS_PROF_RAW_HASH] = dent;

- dent = create_profile_file(dir, "raw_abi", profile,
- &aa_fs_seq_raw_abi_fops);
+ error = gen_symlink_name(target, sizeof(target), depth,
+ profile->rawdata->name, "abi");
+ if (error < 0)
+ goto fail2;
+ dent = securityfs_create_symlink("raw_abi", dir, target, NULL);
if (IS_ERR(dent))
goto fail;
profile->dents[AAFS_PROF_RAW_ABI] = dent;

- dent = securityfs_create_file("raw_data", S_IFREG | 0444, dir,
- profile->proxy,
- &aa_fs_rawdata_fops);
+ error = gen_symlink_name(target, sizeof(target), depth,
+ profile->rawdata->name, "raw_data");
+ if (error < 0)
+ goto fail2;
+ dent = securityfs_create_symlink("raw_data", dir, target, NULL);
if (IS_ERR(dent))
goto fail;
profile->dents[AAFS_PROF_RAW_DATA] = dent;
- d_inode(dent)->i_size = profile->rawdata->size;
- aa_get_proxy(profile->proxy);
}

list_for_each_entry(child, &profile->base.profiles, base.list) {
@@ -803,6 +965,16 @@ int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
return error;
}

+static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
+{
+ struct aa_loaddata *ent, *tmp;
+
+ AA_BUG(!mutex_is_locked(&ns->lock));
+
+ list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
+ __aa_fs_remove_rawdata(ent);
+}
+
void __aa_fs_ns_rmdir(struct aa_ns *ns)
{
struct aa_ns *sub;
@@ -821,6 +993,8 @@ void __aa_fs_ns_rmdir(struct aa_ns *ns)
mutex_unlock(&sub->lock);
}

+ __aa_fs_list_remove_rawdata(ns);
+
if (ns_subns_dir(ns)) {
sub = d_inode(ns_subns_dir(ns))->i_private;
aa_put_ns(sub);
diff --git a/security/apparmor/include/apparmorfs.h b/security/apparmor/include/apparmorfs.h
index 120a798b5bb0..0b6d32b3f05e 100644
--- a/security/apparmor/include/apparmorfs.h
+++ b/security/apparmor/include/apparmorfs.h
@@ -106,6 +106,7 @@ enum aafs_prof_type {
#define prof_dir(X) ((X)->dents[AAFS_PROF_DIR])
#define prof_child_dir(X) ((X)->dents[AAFS_PROF_PROFS])

+void __aa_bump_ns_revision(struct aa_ns *ns);
void __aa_fs_profile_rmdir(struct aa_profile *profile);
void __aa_fs_profile_migrate_dents(struct aa_profile *old,
struct aa_profile *new);
@@ -114,4 +115,8 @@ void __aa_fs_ns_rmdir(struct aa_ns *ns);
int __aa_fs_ns_mkdir(struct aa_ns *ns, struct dentry *parent,
const char *name);

+struct aa_loaddata;
+void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata);
+int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata);
+
#endif /* __AA_APPARMORFS_H */
diff --git a/security/apparmor/include/policy_ns.h b/security/apparmor/include/policy_ns.h
index 89cffddd7e75..23e7cb770226 100644
--- a/security/apparmor/include/policy_ns.h
+++ b/security/apparmor/include/policy_ns.h
@@ -68,6 +68,10 @@ struct aa_ns {
atomic_t uniq_null;
long uniq_id;
int level;
+ long revision;
+ wait_queue_head_t wait;
+
+ struct list_head rawdata_list;

struct dentry *dents[AAFS_NS_SIZEOF];
};
diff --git a/security/apparmor/include/policy_unpack.h b/security/apparmor/include/policy_unpack.h
index 4c1319eebc42..6c349cf69590 100644
--- a/security/apparmor/include/policy_unpack.h
+++ b/security/apparmor/include/policy_unpack.h
@@ -17,6 +17,8 @@

#include <linux/list.h>
#include <linux/kref.h>
+#include <linux/dcache.h>
+#include <linux/workqueue.h>

struct aa_load_ent {
struct list_head list;
@@ -36,25 +38,82 @@ struct aa_load_ent *aa_load_ent_alloc(void);
#define PACKED_MODE_KILL 2
#define PACKED_MODE_UNCONFINED 3

-/* struct aa_loaddata - buffer of policy load data set */
+struct aa_ns;
+
+enum {
+ AAFS_LOADDATA_ABI = 0,
+ AAFS_LOADDATA_REVISION,
+ AAFS_LOADDATA_HASH,
+ AAFS_LOADDATA_DATA,
+ AAFS_LOADDATA_DIR, /* must be last actual entry */
+ AAFS_LOADDATA_NDENTS /* count of entries */
+};
+
+/*
+ * struct aa_loaddata - buffer of policy raw_data set
+ *
+ * there is no loaddata ref for being on ns list, nor a ref from
+ * d_inode(@dentry) when grab a ref from these, @ns->lock must be held
+ * && __aa_get_loaddata() needs to be used, and the return value
+ * checked, if NULL the loaddata is already being reaped and should be
+ * considered dead.
+*/
struct aa_loaddata {
struct kref count;
+ struct list_head list;
+ struct work_struct work;
+ struct dentry *dents[AAFS_LOADDATA_NDENTS];
+ struct aa_ns *ns;
+ char *name;
size_t size;
+ long revision; /* the ns policy revision this caused */
int abi;
unsigned char *hash;
+
char data[];
};

int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, const char **ns);

static inline struct aa_loaddata *
+/**
+ * __aa_get_loaddata - get a reference count to uncounted data reference
+ * @data: reference to get a count on
+ *
+ * Returns: pointer to reference OR NULL if race is lost and reference is
+ * being repeated.
+ * Requires: @data->ns->lock held, and the return code MUST be checked
+ *
+ * Use only from inode->i_private and @data->list found references
+ */
+__aa_get_loaddata(struct aa_loaddata *data)
+{
+ if (data && kref_get_not0(&(data->count)))
+ return data;
+
+ return NULL;
+}
+
+/**
+ * aa_get_loaddata - get a reference count from a counted data reference
+ * @data: reference to get a count on
+ *
+ * Returns: point to reference
+ * Requires: @data to have a valid reference count on it. It is a bug
+ * if the race to reap can be encountered when it is used.
+ */
+static inline struct aa_loaddata *
aa_get_loaddata(struct aa_loaddata *data)
{
- if (data)
- kref_get(&(data->count));
- return data;
+ struct aa_loaddata *tmp = __aa_get_loaddata(data);
+
+ AA_BUG(data && !tmp);
+
+ return tmp;
}

+void __aa_loaddata_update(struct aa_loaddata *data, long revision);
+bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r);
void aa_loaddata_kref(struct kref *kref);
static inline void aa_put_loaddata(struct aa_loaddata *data)
{
diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index c0a4066ddfb2..27e39dd278f6 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -838,6 +838,7 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
const char *ns_name, *info = NULL;
struct aa_ns *ns = NULL;
struct aa_load_ent *ent, *tmp;
+ struct aa_loaddata *rawdata_ent;
const char *op = OP_PROF_REPL;
ssize_t count, error;
LIST_HEAD(lh);
@@ -885,6 +886,20 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
ns = aa_get_ns(view);

mutex_lock(&ns->lock);
+ /* check for duplicate rawdata blobs: space and file dedup */
+ list_for_each_entry(rawdata_ent, &ns->rawdata_list, list) {
+ if (aa_rawdata_eq(rawdata_ent, udata)) {
+ struct aa_loaddata *tmp;
+
+ tmp = __aa_get_loaddata(rawdata_ent);
+ /* check we didn't fail the race */
+ if (tmp) {
+ aa_put_loaddata(udata);
+ udata = tmp;
+ break;
+ }
+ }
+ }
/* setup parent and ns info */
list_for_each_entry(ent, &lh, list) {
struct aa_policy *policy;
@@ -927,6 +942,14 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
}

/* create new fs entries for introspection if needed */
+ if (!udata->dents[AAFS_LOADDATA_DIR]) {
+ error = __aa_fs_create_rawdata(ns, udata);
+ if (error) {
+ info = "failed to create raw_data dir and files";
+ ent = NULL;
+ goto fail_lock;
+ }
+ }
list_for_each_entry(ent, &lh, list) {
if (ent->old) {
/* inherit old interface files */
@@ -953,10 +976,24 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
}

/* Done with checks that may fail - do actual replacement */
+ __aa_bump_ns_revision(ns);
+ __aa_loaddata_update(udata, ns->revision);
list_for_each_entry_safe(ent, tmp, &lh, list) {
list_del_init(&ent->list);
op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL;

+ if (ent->old && ent->old->rawdata == ent->new->rawdata) {
+ /* dedup actual profile replacement */
+ audit_policy(profile, op, ns_name, ent->new->base.hname,
+ "same as current profile, skipping",
+ error);
+ goto skip;
+ }
+
+ /*
+ * TODO: finer dedup based on profile range in data. Load set
+ * can differ but profile may remain unchanged
+ */
audit_policy(profile, op, NULL, ent->new->base.hname,
NULL, error);

@@ -996,6 +1033,7 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
aa_get_profile(ent->new));
__list_add_profile(&ns->base.profiles, ent->new);
}
+ skip:
aa_load_ent_free(ent);
}
mutex_unlock(&ns->lock);
@@ -1011,7 +1049,7 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
mutex_unlock(&ns->lock);

/* audit cause of failure */
- op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
+ op = (ent && !ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
fail:
audit_policy(profile, op, ns_name, ent ? ent->new->base.hname : NULL,
info, error);
@@ -1083,6 +1121,7 @@ ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_profile *subj,
/* remove namespace - can only happen if fqname[0] == ':' */
mutex_lock(&ns->parent->lock);
__aa_remove_ns(ns);
+ __aa_bump_ns_revision(ns);
mutex_unlock(&ns->parent->lock);
} else {
/* remove profile */
@@ -1095,6 +1134,7 @@ ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_profile *subj,
}
name = profile->base.hname;
__remove_profile(profile);
+ __aa_bump_ns_revision(ns);
mutex_unlock(&ns->lock);
}

diff --git a/security/apparmor/policy_ns.c b/security/apparmor/policy_ns.c
index 93d1826c4b09..e08ad92471a6 100644
--- a/security/apparmor/policy_ns.c
+++ b/security/apparmor/policy_ns.c
@@ -99,7 +99,9 @@ static struct aa_ns *alloc_ns(const char *prefix, const char *name)
goto fail_ns;

INIT_LIST_HEAD(&ns->sub_ns);
+ INIT_LIST_HEAD(&ns->rawdata_list);
mutex_init(&ns->lock);
+ init_waitqueue_head(&ns->wait);

/* released by aa_free_ns() */
ns->unconfined = aa_alloc_profile("unconfined", GFP_KERNEL);
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index 2e37c9c26bbd..54a0d2c44de4 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -122,13 +122,58 @@ static int audit_iface(struct aa_profile *new, const char *ns_name,
return aa_audit(AUDIT_APPARMOR_STATUS, profile, &sa, audit_cb);
}

+void __aa_loaddata_update(struct aa_loaddata *data, long revision)
+{
+ AA_BUG(!data);
+ AA_BUG(!data->ns);
+ AA_BUG(!data->dents[AAFS_LOADDATA_REVISION]);
+ AA_BUG(!mutex_is_locked(&data->ns->lock));
+ AA_BUG(data->revision > revision);
+
+ data->revision = revision;
+ d_inode(data->dents[AAFS_LOADDATA_DIR])->i_mtime =
+ current_time(d_inode(data->dents[AAFS_LOADDATA_DIR]));
+ d_inode(data->dents[AAFS_LOADDATA_REVISION])->i_mtime =
+ current_time(d_inode(data->dents[AAFS_LOADDATA_REVISION]));
+}
+
+bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r)
+{
+ if (l->size != r->size)
+ return false;
+ if (aa_g_hash_policy && memcmp(l->hash, r->hash, aa_hash_size()) != 0)
+ return false;
+ return memcmp(l->data, r->data, r->size) == 0;
+}
+
+/*
+ * need to take the ns mutex lock which is NOT safe most places that
+ * put_loaddata is called, so we have to delay freeing it
+ */
+static void do_loaddata_free(struct work_struct *work)
+{
+ struct aa_loaddata *d = container_of(work, struct aa_loaddata, work);
+ struct aa_ns *ns = aa_get_ns(d->ns);
+
+ if (ns) {
+ mutex_lock(&ns->lock);
+ __aa_fs_remove_rawdata(d);
+ mutex_unlock(&ns->lock);
+ aa_put_ns(ns);
+ }
+
+ kzfree(d->hash);
+ kfree(d->name);
+ kvfree(d);
+}
+
void aa_loaddata_kref(struct kref *kref)
{
struct aa_loaddata *d = container_of(kref, struct aa_loaddata, count);

if (d) {
- kzfree(d->hash);
- kvfree(d);
+ INIT_WORK(&d->work, do_loaddata_free);
+ schedule_work(&d->work);
}
}

--
2.11.0
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