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-rw-r--r--security/apparmor/Kconfig12
-rw-r--r--security/apparmor/Makefile7
-rw-r--r--security/apparmor/apparmorfs.c636
-rw-r--r--security/apparmor/capability.c5
-rw-r--r--security/apparmor/context.c16
-rw-r--r--security/apparmor/crypto.c97
-rw-r--r--security/apparmor/domain.c24
-rw-r--r--security/apparmor/include/apparmor.h6
-rw-r--r--security/apparmor/include/apparmorfs.h40
-rw-r--r--security/apparmor/include/audit.h1
-rw-r--r--security/apparmor/include/capability.h4
-rw-r--r--security/apparmor/include/context.h15
-rw-r--r--security/apparmor/include/crypto.h36
-rw-r--r--security/apparmor/include/policy.h218
-rw-r--r--security/apparmor/include/policy_unpack.h21
-rw-r--r--security/apparmor/lib.c5
-rw-r--r--security/apparmor/lsm.c22
-rw-r--r--security/apparmor/policy.c609
-rw-r--r--security/apparmor/policy_unpack.c135
-rw-r--r--security/apparmor/procattr.c2
20 files changed, 1502 insertions, 409 deletions
diff --git a/security/apparmor/Kconfig b/security/apparmor/Kconfig
index 9b9013b..d49c539 100644
--- a/security/apparmor/Kconfig
+++ b/security/apparmor/Kconfig
@@ -29,3 +29,15 @@ config SECURITY_APPARMOR_BOOTPARAM_VALUE
boot.
If you are unsure how to answer this question, answer 1.
+
+config SECURITY_APPARMOR_HASH
+ bool "SHA1 hash of loaded profiles"
+ depends on SECURITY_APPARMOR
+ depends on CRYPTO
+ select CRYPTO_SHA1
+ default y
+
+ help
+ This option selects whether sha1 hashing is done against loaded
+ profiles and exported for inspection to user space via the apparmor
+ filesystem.
diff --git a/security/apparmor/Makefile b/security/apparmor/Makefile
index 5706b74..d693df8 100644
--- a/security/apparmor/Makefile
+++ b/security/apparmor/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_SECURITY_APPARMOR) += apparmor.o
apparmor-y := apparmorfs.o audit.o capability.o context.o ipc.o lib.o match.o \
path.o domain.o policy.o policy_unpack.o procattr.o lsm.o \
resource.o sid.o file.o
+apparmor-$(CONFIG_SECURITY_APPARMOR_HASH) += crypto.o
clean-files := capability_names.h rlim_names.h
@@ -18,7 +19,11 @@ quiet_cmd_make-caps = GEN $@
cmd_make-caps = echo "static const char *const capability_names[] = {" > $@ ;\
sed $< >>$@ -r -n -e '/CAP_FS_MASK/d' \
-e 's/^\#define[ \t]+CAP_([A-Z0-9_]+)[ \t]+([0-9]+)/[\2] = "\L\1",/p';\
- echo "};" >> $@
+ echo "};" >> $@ ;\
+ echo -n '\#define AA_FS_CAPS_MASK "' >> $@ ;\
+ sed $< -r -n -e '/CAP_FS_MASK/d' \
+ -e 's/^\#define[ \t]+CAP_([A-Z0-9_]+)[ \t]+([0-9]+)/\L\1/p' | \
+ tr '\n' ' ' | sed -e 's/ $$/"\n/' >> $@
# Build a lower case string table of rlimit names.
diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 16c15ec..95c2b26 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -12,6 +12,7 @@
* License.
*/
+#include <linux/ctype.h>
#include <linux/security.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
@@ -19,15 +20,56 @@
#include <linux/uaccess.h>
#include <linux/namei.h>
#include <linux/capability.h>
+#include <linux/rcupdate.h>
#include "include/apparmor.h"
#include "include/apparmorfs.h"
#include "include/audit.h"
#include "include/context.h"
+#include "include/crypto.h"
#include "include/policy.h"
#include "include/resource.h"
/**
+ * aa_mangle_name - mangle a profile name to std profile layout form
+ * @name: profile name to mangle (NOT NULL)
+ * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
+ *
+ * Returns: length of mangled name
+ */
+static int mangle_name(char *name, char *target)
+{
+ char *t = target;
+
+ while (*name == '/' || *name == '.')
+ name++;
+
+ if (target) {
+ for (; *name; name++) {
+ if (*name == '/')
+ *(t)++ = '.';
+ else if (isspace(*name))
+ *(t)++ = '_';
+ else if (isalnum(*name) || strchr("._-", *name))
+ *(t)++ = *name;
+ }
+
+ *t = 0;
+ } else {
+ int len = 0;
+ for (; *name; name++) {
+ if (isalnum(*name) || isspace(*name) ||
+ strchr("/._-", *name))
+ len++;
+ }
+
+ return len;
+ }
+
+ return t - target;
+}
+
+/**
* aa_simple_write_to_buffer - common routine for getting policy from user
* @op: operation doing the user buffer copy
* @userbuf: user buffer to copy data from (NOT NULL)
@@ -182,8 +224,567 @@ const struct file_operations aa_fs_seq_file_ops = {
.release = single_release,
};
-/** Base file system setup **/
+static int aa_fs_seq_profile_open(struct inode *inode, struct file *file,
+ int (*show)(struct seq_file *, void *))
+{
+ struct aa_replacedby *r = aa_get_replacedby(inode->i_private);
+ int error = single_open(file, show, r);
+
+ if (error) {
+ file->private_data = NULL;
+ aa_put_replacedby(r);
+ }
+
+ return error;
+}
+
+static int aa_fs_seq_profile_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = (struct seq_file *) file->private_data;
+ if (seq)
+ aa_put_replacedby(seq->private);
+ return single_release(inode, file);
+}
+
+static int aa_fs_seq_profname_show(struct seq_file *seq, void *v)
+{
+ struct aa_replacedby *r = seq->private;
+ struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+ seq_printf(seq, "%s\n", profile->base.name);
+ aa_put_profile(profile);
+
+ return 0;
+}
+
+static int aa_fs_seq_profname_open(struct inode *inode, struct file *file)
+{
+ return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profname_show);
+}
+
+static const struct file_operations aa_fs_profname_fops = {
+ .owner = THIS_MODULE,
+ .open = aa_fs_seq_profname_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = aa_fs_seq_profile_release,
+};
+
+static int aa_fs_seq_profmode_show(struct seq_file *seq, void *v)
+{
+ struct aa_replacedby *r = seq->private;
+ struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+ seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
+ aa_put_profile(profile);
+
+ return 0;
+}
+
+static int aa_fs_seq_profmode_open(struct inode *inode, struct file *file)
+{
+ return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profmode_show);
+}
+
+static const struct file_operations aa_fs_profmode_fops = {
+ .owner = THIS_MODULE,
+ .open = aa_fs_seq_profmode_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = aa_fs_seq_profile_release,
+};
+
+static int aa_fs_seq_profattach_show(struct seq_file *seq, void *v)
+{
+ struct aa_replacedby *r = seq->private;
+ struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+ if (profile->attach)
+ seq_printf(seq, "%s\n", profile->attach);
+ else if (profile->xmatch)
+ seq_puts(seq, "<unknown>\n");
+ else
+ seq_printf(seq, "%s\n", profile->base.name);
+ aa_put_profile(profile);
+
+ return 0;
+}
+
+static int aa_fs_seq_profattach_open(struct inode *inode, struct file *file)
+{
+ return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profattach_show);
+}
+
+static const struct file_operations aa_fs_profattach_fops = {
+ .owner = THIS_MODULE,
+ .open = aa_fs_seq_profattach_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = aa_fs_seq_profile_release,
+};
+
+static int aa_fs_seq_hash_show(struct seq_file *seq, void *v)
+{
+ struct aa_replacedby *r = seq->private;
+ struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
+ unsigned int i, size = aa_hash_size();
+
+ if (profile->hash) {
+ for (i = 0; i < size; i++)
+ seq_printf(seq, "%.2x", profile->hash[i]);
+ seq_puts(seq, "\n");
+ }
+
+ return 0;
+}
+
+static int aa_fs_seq_hash_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, aa_fs_seq_hash_show, inode->i_private);
+}
+
+static const struct file_operations aa_fs_seq_hash_fops = {
+ .owner = THIS_MODULE,
+ .open = aa_fs_seq_hash_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+/** fns to setup dynamic per profile/namespace files **/
+void __aa_fs_profile_rmdir(struct aa_profile *profile)
+{
+ struct aa_profile *child;
+ int i;
+
+ if (!profile)
+ return;
+
+ list_for_each_entry(child, &profile->base.profiles, base.list)
+ __aa_fs_profile_rmdir(child);
+
+ for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
+ struct aa_replacedby *r;
+ if (!profile->dents[i])
+ continue;
+
+ r = profile->dents[i]->d_inode->i_private;
+ securityfs_remove(profile->dents[i]);
+ aa_put_replacedby(r);
+ profile->dents[i] = NULL;
+ }
+}
+
+void __aa_fs_profile_migrate_dents(struct aa_profile *old,
+ struct aa_profile *new)
+{
+ int i;
+
+ for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
+ new->dents[i] = old->dents[i];
+ old->dents[i] = NULL;
+ }
+}
+
+static struct dentry *create_profile_file(struct dentry *dir, const char *name,
+ struct aa_profile *profile,
+ const struct file_operations *fops)
+{
+ struct aa_replacedby *r = aa_get_replacedby(profile->replacedby);
+ struct dentry *dent;
+
+ dent = securityfs_create_file(name, S_IFREG | 0444, dir, r, fops);
+ if (IS_ERR(dent))
+ aa_put_replacedby(r);
+
+ return dent;
+}
+
+/* requires lock be held */
+int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
+{
+ struct aa_profile *child;
+ struct dentry *dent = NULL, *dir;
+ int error;
+
+ if (!parent) {
+ struct aa_profile *p;
+ p = aa_deref_parent(profile);
+ dent = prof_dir(p);
+ /* adding to parent that previously didn't have children */
+ dent = securityfs_create_dir("profiles", dent);
+ if (IS_ERR(dent))
+ goto fail;
+ prof_child_dir(p) = parent = dent;
+ }
+
+ if (!profile->dirname) {
+ int len, id_len;
+ len = mangle_name(profile->base.name, NULL);
+ id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
+
+ profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
+ if (!profile->dirname)
+ goto fail;
+
+ mangle_name(profile->base.name, profile->dirname);
+ sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
+ }
+
+ dent = securityfs_create_dir(profile->dirname, parent);
+ if (IS_ERR(dent))
+ goto fail;
+ prof_dir(profile) = dir = dent;
+
+ dent = create_profile_file(dir, "name", profile, &aa_fs_profname_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ profile->dents[AAFS_PROF_NAME] = dent;
+
+ dent = create_profile_file(dir, "mode", profile, &aa_fs_profmode_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ profile->dents[AAFS_PROF_MODE] = dent;
+
+ dent = create_profile_file(dir, "attach", profile,
+ &aa_fs_profattach_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ profile->dents[AAFS_PROF_ATTACH] = dent;
+
+ if (profile->hash) {
+ dent = create_profile_file(dir, "sha1", profile,
+ &aa_fs_seq_hash_fops);
+ if (IS_ERR(dent))
+ goto fail;
+ profile->dents[AAFS_PROF_HASH] = dent;
+ }
+
+ list_for_each_entry(child, &profile->base.profiles, base.list) {
+ error = __aa_fs_profile_mkdir(child, prof_child_dir(profile));
+ if (error)
+ goto fail2;
+ }
+
+ return 0;
+
+fail:
+ error = PTR_ERR(dent);
+
+fail2:
+ __aa_fs_profile_rmdir(profile);
+
+ return error;
+}
+
+void __aa_fs_namespace_rmdir(struct aa_namespace *ns)
+{
+ struct aa_namespace *sub;
+ struct aa_profile *child;
+ int i;
+
+ if (!ns)
+ return;
+
+ list_for_each_entry(child, &ns->base.profiles, base.list)
+ __aa_fs_profile_rmdir(child);
+
+ list_for_each_entry(sub, &ns->sub_ns, base.list) {
+ mutex_lock(&sub->lock);
+ __aa_fs_namespace_rmdir(sub);
+ mutex_unlock(&sub->lock);
+ }
+ for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
+ securityfs_remove(ns->dents[i]);
+ ns->dents[i] = NULL;
+ }
+}
+
+int __aa_fs_namespace_mkdir(struct aa_namespace *ns, struct dentry *parent,
+ const char *name)
+{
+ struct aa_namespace *sub;
+ struct aa_profile *child;
+ struct dentry *dent, *dir;
+ int error;
+
+ if (!name)
+ name = ns->base.name;
+
+ dent = securityfs_create_dir(name, parent);
+ if (IS_ERR(dent))
+ goto fail;
+ ns_dir(ns) = dir = dent;
+
+ dent = securityfs_create_dir("profiles", dir);
+ if (IS_ERR(dent))
+ goto fail;
+ ns_subprofs_dir(ns) = dent;
+
+ dent = securityfs_create_dir("namespaces", dir);
+ if (IS_ERR(dent))
+ goto fail;
+ ns_subns_dir(ns) = dent;
+
+ list_for_each_entry(child, &ns->base.profiles, base.list) {
+ error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns));
+ if (error)
+ goto fail2;
+ }
+
+ list_for_each_entry(sub, &ns->sub_ns, base.list) {
+ mutex_lock(&sub->lock);
+ error = __aa_fs_namespace_mkdir(sub, ns_subns_dir(ns), NULL);
+ mutex_unlock(&sub->lock);
+ if (error)
+ goto fail2;
+ }
+
+ return 0;
+
+fail:
+ error = PTR_ERR(dent);
+
+fail2:
+ __aa_fs_namespace_rmdir(ns);
+
+ return error;
+}
+
+
+#define list_entry_next(pos, member) \
+ list_entry(pos->member.next, typeof(*pos), member)
+#define list_entry_is_head(pos, head, member) (&pos->member == (head))
+
+/**
+ * __next_namespace - find the next namespace to list
+ * @root: root namespace to stop search at (NOT NULL)
+ * @ns: current ns position (NOT NULL)
+ *
+ * Find the next namespace from @ns under @root and handle all locking needed
+ * while switching current namespace.
+ *
+ * Returns: next namespace or NULL if at last namespace under @root
+ * Requires: ns->parent->lock to be held
+ * NOTE: will not unlock root->lock
+ */
+static struct aa_namespace *__next_namespace(struct aa_namespace *root,
+ struct aa_namespace *ns)
+{
+ struct aa_namespace *parent, *next;
+
+ /* is next namespace a child */
+ if (!list_empty(&ns->sub_ns)) {
+ next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
+ mutex_lock(&next->lock);
+ return next;
+ }
+
+ /* check if the next ns is a sibling, parent, gp, .. */
+ parent = ns->parent;
+ while (parent) {
+ mutex_unlock(&ns->lock);
+ next = list_entry_next(ns, base.list);
+ if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
+ mutex_lock(&next->lock);
+ return next;
+ }
+ if (parent == root)
+ return NULL;
+ ns = parent;
+ parent = parent->parent;
+ }
+
+ return NULL;
+}
+
+/**
+ * __first_profile - find the first profile in a namespace
+ * @root: namespace that is root of profiles being displayed (NOT NULL)
+ * @ns: namespace to start in (NOT NULL)
+ *
+ * Returns: unrefcounted profile or NULL if no profile
+ * Requires: profile->ns.lock to be held
+ */
+static struct aa_profile *__first_profile(struct aa_namespace *root,
+ struct aa_namespace *ns)
+{
+ for (; ns; ns = __next_namespace(root, ns)) {
+ if (!list_empty(&ns->base.profiles))
+ return list_first_entry(&ns->base.profiles,
+ struct aa_profile, base.list);
+ }
+ return NULL;
+}
+
+/**
+ * __next_profile - step to the next profile in a profile tree
+ * @profile: current profile in tree (NOT NULL)
+ *
+ * Perform a depth first traversal on the profile tree in a namespace
+ *
+ * Returns: next profile or NULL if done
+ * Requires: profile->ns.lock to be held
+ */
+static struct aa_profile *__next_profile(struct aa_profile *p)
+{
+ struct aa_profile *parent;
+ struct aa_namespace *ns = p->ns;
+
+ /* is next profile a child */
+ if (!list_empty(&p->base.profiles))
+ return list_first_entry(&p->base.profiles, typeof(*p),
+ base.list);
+
+ /* is next profile a sibling, parent sibling, gp, sibling, .. */
+ parent = rcu_dereference_protected(p->parent,
+ mutex_is_locked(&p->ns->lock));
+ while (parent) {
+ p = list_entry_next(p, base.list);
+ if (!list_entry_is_head(p, &parent->base.profiles, base.list))
+ return p;
+ p = parent;
+ parent = rcu_dereference_protected(parent->parent,
+ mutex_is_locked(&parent->ns->lock));
+ }
+
+ /* is next another profile in the namespace */
+ p = list_entry_next(p, base.list);
+ if (!list_entry_is_head(p, &ns->base.profiles, base.list))
+ return p;
+
+ return NULL;
+}
+
+/**
+ * next_profile - step to the next profile in where ever it may be
+ * @root: root namespace (NOT NULL)
+ * @profile: current profile (NOT NULL)
+ *
+ * Returns: next profile or NULL if there isn't one
+ */
+static struct aa_profile *next_profile(struct aa_namespace *root,
+ struct aa_profile *profile)
+{
+ struct aa_profile *next = __next_profile(profile);
+ if (next)
+ return next;
+
+ /* finished all profiles in namespace move to next namespace */
+ return __first_profile(root, __next_namespace(root, profile->ns));
+}
+
+/**
+ * p_start - start a depth first traversal of profile tree
+ * @f: seq_file to fill
+ * @pos: current position
+ *
+ * Returns: first profile under current namespace or NULL if none found
+ *
+ * acquires first ns->lock
+ */
+static void *p_start(struct seq_file *f, loff_t *pos)
+{
+ struct aa_profile *profile = NULL;
+ struct aa_namespace *root = aa_current_profile()->ns;
+ loff_t l = *pos;
+ f->private = aa_get_namespace(root);
+
+
+ /* find the first profile */
+ mutex_lock(&root->lock);
+ profile = __first_profile(root, root);
+
+ /* skip to position */
+ for (; profile && l > 0; l--)
+ profile = next_profile(root, profile);
+
+ return profile;
+}
+
+/**
+ * p_next - read the next profile entry
+ * @f: seq_file to fill
+ * @p: profile previously returned
+ * @pos: current position
+ *
+ * Returns: next profile after @p or NULL if none
+ *
+ * may acquire/release locks in namespace tree as necessary
+ */
+static void *p_next(struct seq_file *f, void *p, loff_t *pos)
+{
+ struct aa_profile *profile = p;
+ struct aa_namespace *ns = f->private;
+ (*pos)++;
+
+ return next_profile(ns, profile);
+}
+
+/**
+ * p_stop - stop depth first traversal
+ * @f: seq_file we are filling
+ * @p: the last profile writen
+ *
+ * Release all locking done by p_start/p_next on namespace tree
+ */
+static void p_stop(struct seq_file *f, void *p)
+{
+ struct aa_profile *profile = p;
+ struct aa_namespace *root = f->private, *ns;
+
+ if (profile) {
+ for (ns = profile->ns; ns && ns != root; ns = ns->parent)
+ mutex_unlock(&ns->lock);
+ }
+ mutex_unlock(&root->lock);
+ aa_put_namespace(root);
+}
+
+/**
+ * seq_show_profile - show a profile entry
+ * @f: seq_file to file
+ * @p: current position (profile) (NOT NULL)
+ *
+ * Returns: error on failure
+ */
+static int seq_show_profile(struct seq_file *f, void *p)
+{
+ struct aa_profile *profile = (struct aa_profile *)p;
+ struct aa_namespace *root = f->private;
+
+ if (profile->ns != root)
+ seq_printf(f, ":%s://", aa_ns_name(root, profile->ns));
+ seq_printf(f, "%s (%s)\n", profile->base.hname,
+ aa_profile_mode_names[profile->mode]);
+
+ return 0;
+}
+
+static const struct seq_operations aa_fs_profiles_op = {
+ .start = p_start,
+ .next = p_next,
+ .stop = p_stop,
+ .show = seq_show_profile,
+};
+
+static int profiles_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &aa_fs_profiles_op);
+}
+
+static int profiles_release(struct inode *inode, struct file *file)
+{
+ return seq_release(inode, file);
+}
+
+static const struct file_operations aa_fs_profiles_fops = {
+ .open = profiles_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = profiles_release,
+};
+
+
+/** Base file system setup **/
static struct aa_fs_entry aa_fs_entry_file[] = {
AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
"link lock"),
@@ -198,11 +799,18 @@ static struct aa_fs_entry aa_fs_entry_domain[] = {
{ }
};
+static struct aa_fs_entry aa_fs_entry_policy[] = {
+ AA_FS_FILE_BOOLEAN("set_load", 1),
+ {}
+};
+
static struct aa_fs_entry aa_fs_entry_features[] = {
+ AA_FS_DIR("policy", aa_fs_entry_policy),
AA_FS_DIR("domain", aa_fs_entry_domain),
AA_FS_DIR("file", aa_fs_entry_file),
AA_FS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
AA_FS_DIR("rlimit", aa_fs_entry_rlimit),
+ AA_FS_DIR("caps", aa_fs_entry_caps),
{ }
};
@@ -210,6 +818,7 @@ static struct aa_fs_entry aa_fs_entry_apparmor[] = {
AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load),
AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace),
AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove),
+ AA_FS_FILE_FOPS("profiles", 0640, &aa_fs_profiles_fops),
AA_FS_DIR("features", aa_fs_entry_features),
{ }
};
@@ -240,6 +849,7 @@ static int __init aafs_create_file(struct aa_fs_entry *fs_file,
return error;
}
+static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir);
/**
* aafs_create_dir - recursively create a directory entry in the securityfs
* @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL)
@@ -250,17 +860,16 @@ static int __init aafs_create_file(struct aa_fs_entry *fs_file,
static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
struct dentry *parent)
{
- int error;
struct aa_fs_entry *fs_file;
+ struct dentry *dir;
+ int error;
- fs_dir->dentry = securityfs_create_dir(fs_dir->name, parent);
- if (IS_ERR(fs_dir->dentry)) {
- error = PTR_ERR(fs_dir->dentry);
- fs_dir->dentry = NULL;
- goto failed;
- }
+ dir = securityfs_create_dir(fs_dir->name, parent);
+ if (IS_ERR(dir))
+ return PTR_ERR(dir);
+ fs_dir->dentry = dir;
- for (fs_file = fs_dir->v.files; fs_file->name; ++fs_file) {
+ for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
if (fs_file->v_type == AA_FS_TYPE_DIR)
error = aafs_create_dir(fs_file, fs_dir->dentry);
else
@@ -272,6 +881,8 @@ static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
return 0;
failed:
+ aafs_remove_dir(fs_dir);
+
return error;
}
@@ -296,7 +907,7 @@ static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir)
{
struct aa_fs_entry *fs_file;
- for (fs_file = fs_dir->v.files; fs_file->name; ++fs_file) {
+ for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
if (fs_file->v_type == AA_FS_TYPE_DIR)
aafs_remove_dir(fs_file);
else
@@ -340,6 +951,11 @@ static int __init aa_create_aafs(void)
if (error)
goto error;
+ error = __aa_fs_namespace_mkdir(root_ns, aa_fs_entry.dentry,
+ "policy");
+ if (error)
+ goto error;
+
/* TODO: add support for apparmorfs_null and apparmorfs_mnt */
/* Report that AppArmor fs is enabled */
diff --git a/security/apparmor/capability.c b/security/apparmor/capability.c
index 887a5e9..84d1f5f 100644
--- a/security/apparmor/capability.c
+++ b/security/apparmor/capability.c
@@ -27,6 +27,11 @@
*/
#include "capability_names.h"
+struct aa_fs_entry aa_fs_entry_caps[] = {
+ AA_FS_FILE_STRING("mask", AA_FS_CAPS_MASK),
+ { }
+};
+
struct audit_cache {
struct aa_profile *profile;
kernel_cap_t caps;
diff --git a/security/apparmor/context.c b/security/apparmor/context.c
index d5af1d1..3064c6c 100644
--- a/security/apparmor/context.c
+++ b/security/apparmor/context.c
@@ -112,9 +112,9 @@ int aa_replace_current_profile(struct aa_profile *profile)
aa_clear_task_cxt_trans(cxt);
/* be careful switching cxt->profile, when racing replacement it
- * is possible that cxt->profile->replacedby is the reference keeping
- * @profile valid, so make sure to get its reference before dropping
- * the reference on cxt->profile */
+ * is possible that cxt->profile->replacedby->profile is the reference
+ * keeping @profile valid, so make sure to get its reference before
+ * dropping the reference on cxt->profile */
aa_get_profile(profile);
aa_put_profile(cxt->profile);
cxt->profile = profile;
@@ -175,7 +175,7 @@ int aa_set_current_hat(struct aa_profile *profile, u64 token)
abort_creds(new);
return -EACCES;
}
- cxt->profile = aa_get_profile(aa_newest_version(profile));
+ cxt->profile = aa_get_newest_profile(profile);
/* clear exec on switching context */
aa_put_profile(cxt->onexec);
cxt->onexec = NULL;
@@ -212,14 +212,8 @@ int aa_restore_previous_profile(u64 token)
}
aa_put_profile(cxt->profile);
- cxt->profile = aa_newest_version(cxt->previous);
+ cxt->profile = aa_get_newest_profile(cxt->previous);
BUG_ON(!cxt->profile);
- if (unlikely(cxt->profile != cxt->previous)) {
- aa_get_profile(cxt->profile);
- aa_put_profile(cxt->previous);
- }
- /* ref has been transfered so avoid putting ref in clear_task_cxt */
- cxt->previous = NULL;
/* clear exec && prev information when restoring to previous context */
aa_clear_task_cxt_trans(cxt);
diff --git a/security/apparmor/crypto.c b/security/apparmor/crypto.c
new file mode 100644
index 0000000..d6222ba
--- /dev/null
+++ b/security/apparmor/crypto.c
@@ -0,0 +1,97 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor policy loading interface function definitions.
+ *
+ * Copyright 2013 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ *
+ * Fns to provide a checksum of policy that has been loaded this can be
+ * compared to userspace policy compiles to check loaded policy is what
+ * it should be.
+ */
+
+#include <linux/crypto.h>
+
+#include "include/apparmor.h"
+#include "include/crypto.h"
+
+static unsigned int apparmor_hash_size;
+
+static struct crypto_hash *apparmor_tfm;
+
+unsigned int aa_hash_size(void)
+{
+ return apparmor_hash_size;
+}
+
+int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
+ size_t len)
+{
+ struct scatterlist sg[2];
+ struct hash_desc desc = {
+ .tfm = apparmor_tfm,
+ .flags = 0
+ };
+ int error = -ENOMEM;
+ u32 le32_version = cpu_to_le32(version);
+
+ if (!apparmor_tfm)
+ return 0;
+
+ sg_init_table(sg, 2);
+ sg_set_buf(&sg[0], &le32_version, 4);
+ sg_set_buf(&sg[1], (u8 *) start, len);
+
+ profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
+ if (!profile->hash)
+ goto fail;
+
+ error = crypto_hash_init(&desc);
+ if (error)
+ goto fail;
+ error = crypto_hash_update(&desc, &sg[0], 4);
+ if (error)
+ goto fail;
+ error = crypto_hash_update(&desc, &sg[1], len);
+ if (error)
+ goto fail;
+ error = crypto_hash_final(&desc, profile->hash);
+ if (error)
+ goto fail;
+
+ return 0;
+
+fail:
+ kfree(profile->hash);
+ profile->hash = NULL;
+
+ return error;
+}
+
+static int __init init_profile_hash(void)
+{
+ struct crypto_hash *tfm;
+
+ if (!apparmor_initialized)
+ return 0;
+
+ tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(tfm)) {
+ int error = PTR_ERR(tfm);
+ AA_ERROR("failed to setup profile sha1 hashing: %d\n", error);
+ return error;
+ }
+ apparmor_tfm = tfm;
+ apparmor_hash_size = crypto_hash_digestsize(apparmor_tfm);
+
+ aa_info_message("AppArmor sha1 policy hashing enabled");
+
+ return 0;
+}
+
+late_initcall(init_profile_hash);
diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index 01b7bd6..26c607c 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -144,7 +144,7 @@ static struct aa_profile *__attach_match(const char *name,
int len = 0;
struct aa_profile *profile, *candidate = NULL;
- list_for_each_entry(profile, head, base.list) {
+ list_for_each_entry_rcu(profile, head, base.list) {
if (profile->flags & PFLAG_NULL)
continue;
if (profile->xmatch && profile->xmatch_len > len) {
@@ -177,9 +177,9 @@ static struct aa_profile *find_attach(struct aa_namespace *ns,
{
struct aa_profile *profile;
- read_lock(&ns->lock);
+ rcu_read_lock();
profile = aa_get_profile(__attach_match(name, list));
- read_unlock(&ns->lock);
+ rcu_read_unlock();
return profile;
}
@@ -359,7 +359,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
cxt = cred_cxt(bprm->cred);
BUG_ON(!cxt);
- profile = aa_get_profile(aa_newest_version(cxt->profile));
+ profile = aa_get_newest_profile(cxt->profile);
/*
* get the namespace from the replacement profile as replacement
* can change the namespace
@@ -371,8 +371,8 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
error = aa_path_name(&bprm->file->f_path, profile->path_flags, &buffer,
&name, &info);
if (error) {
- if (profile->flags &
- (PFLAG_IX_ON_NAME_ERROR | PFLAG_UNCONFINED))
+ if (unconfined(profile) ||
+ (profile->flags & PFLAG_IX_ON_NAME_ERROR))
error = 0;
name = bprm->filename;
goto audit;
@@ -417,7 +417,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
if (!(cp.allow & AA_MAY_ONEXEC))
goto audit;
- new_profile = aa_get_profile(aa_newest_version(cxt->onexec));
+ new_profile = aa_get_newest_profile(cxt->onexec);
goto apply;
}
@@ -434,7 +434,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
new_profile = aa_get_profile(profile);
goto x_clear;
} else if (perms.xindex & AA_X_UNCONFINED) {
- new_profile = aa_get_profile(ns->unconfined);
+ new_profile = aa_get_newest_profile(ns->unconfined);
info = "ux fallback";
} else {
error = -ENOENT;
@@ -641,7 +641,10 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
if (count) {
/* attempting to change into a new hat or switch to a sibling */
struct aa_profile *root;
- root = PROFILE_IS_HAT(profile) ? profile->parent : profile;
+ if (PROFILE_IS_HAT(profile))
+ root = aa_get_profile_rcu(&profile->parent);
+ else
+ root = aa_get_profile(profile);
/* find first matching hat */
for (i = 0; i < count && !hat; i++)
@@ -653,6 +656,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
error = -ECHILD;
else
error = -ENOENT;
+ aa_put_profile(root);
goto out;
}
@@ -667,6 +671,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
/* freed below */
name = new_compound_name(root->base.hname, hats[0]);
+ aa_put_profile(root);
target = name;
/* released below */
hat = aa_new_null_profile(profile, 1);
@@ -676,6 +681,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
goto audit;
}
} else {
+ aa_put_profile(root);
target = hat->base.hname;
if (!PROFILE_IS_HAT(hat)) {
info = "target not hat";
diff --git a/security/apparmor/include/apparmor.h b/security/apparmor/include/apparmor.h
index 1ba2ca5..8fb1488 100644
--- a/security/apparmor/include/apparmor.h
+++ b/security/apparmor/include/apparmor.h
@@ -78,6 +78,12 @@ static inline void *kvzalloc(size_t size)
return __aa_kvmalloc(size, __GFP_ZERO);
}
+/* returns 0 if kref not incremented */
+static inline int kref_get_not0(struct kref *kref)
+{
+ return atomic_inc_not_zero(&kref->refcount);
+}
+
/**
* aa_strneq - compare null terminated @str to a non null terminated substring
* @str: a null terminated string
diff --git a/security/apparmor/include/apparmorfs.h b/security/apparmor/include/apparmorfs.h
index 7ea4769..414e568 100644
--- a/security/apparmor/include/apparmorfs.h
+++ b/security/apparmor/include/apparmorfs.h
@@ -61,4 +61,44 @@ extern const struct file_operations aa_fs_seq_file_ops;
extern void __init aa_destroy_aafs(void);
+struct aa_profile;
+struct aa_namespace;
+
+enum aafs_ns_type {
+ AAFS_NS_DIR,
+ AAFS_NS_PROFS,
+ AAFS_NS_NS,
+ AAFS_NS_COUNT,
+ AAFS_NS_MAX_COUNT,
+ AAFS_NS_SIZE,
+ AAFS_NS_MAX_SIZE,
+ AAFS_NS_OWNER,
+ AAFS_NS_SIZEOF,
+};
+
+enum aafs_prof_type {
+ AAFS_PROF_DIR,
+ AAFS_PROF_PROFS,
+ AAFS_PROF_NAME,
+ AAFS_PROF_MODE,
+ AAFS_PROF_ATTACH,
+ AAFS_PROF_HASH,
+ AAFS_PROF_SIZEOF,
+};
+
+#define ns_dir(X) ((X)->dents[AAFS_NS_DIR])
+#define ns_subns_dir(X) ((X)->dents[AAFS_NS_NS])
+#define ns_subprofs_dir(X) ((X)->dents[AAFS_NS_PROFS])
+
+#define prof_dir(X) ((X)->dents[AAFS_PROF_DIR])
+#define prof_child_dir(X) ((X)->dents[AAFS_PROF_PROFS])
+
+void __aa_fs_profile_rmdir(struct aa_profile *profile);
+void __aa_fs_profile_migrate_dents(struct aa_profile *old,
+ struct aa_profile *new);
+int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent);
+void __aa_fs_namespace_rmdir(struct aa_namespace *ns);
+int __aa_fs_namespace_mkdir(struct aa_namespace *ns, struct dentry *parent,
+ const char *name);
+
#endif /* __AA_APPARMORFS_H */
diff --git a/security/apparmor/include/audit.h b/security/apparmor/include/audit.h
index 69d8cae..30e8d76 100644
--- a/security/apparmor/include/audit.h
+++ b/security/apparmor/include/audit.h
@@ -27,7 +27,6 @@ struct aa_profile;
extern const char *const audit_mode_names[];
#define AUDIT_MAX_INDEX 5
-
enum audit_mode {
AUDIT_NORMAL, /* follow normal auditing of accesses */
AUDIT_QUIET_DENIED, /* quiet all denied access messages */
diff --git a/security/apparmor/include/capability.h b/security/apparmor/include/capability.h
index c24d295..2e7c9d6 100644
--- a/security/apparmor/include/capability.h
+++ b/security/apparmor/include/capability.h
@@ -17,6 +17,8 @@
#include <linux/sched.h>
+#include "apparmorfs.h"
+
struct aa_profile;
/* aa_caps - confinement data for capabilities
@@ -34,6 +36,8 @@ struct aa_caps {
kernel_cap_t extended;
};
+extern struct aa_fs_entry aa_fs_entry_caps[];
+
int aa_capable(struct task_struct *task, struct aa_profile *profile, int cap,
int audit);
diff --git a/security/apparmor/include/context.h b/security/apparmor/include/context.h
index d44ba58..6bf6579 100644
--- a/security/apparmor/include/context.h
+++ b/security/apparmor/include/context.h
@@ -98,7 +98,7 @@ static inline struct aa_profile *aa_cred_profile(const struct cred *cred)
{
struct aa_task_cxt *cxt = cred_cxt(cred);
BUG_ON(!cxt || !cxt->profile);
- return aa_newest_version(cxt->profile);
+ return cxt->profile;
}
/**
@@ -152,15 +152,14 @@ static inline struct aa_profile *aa_current_profile(void)
struct aa_profile *profile;
BUG_ON(!cxt || !cxt->profile);
- profile = aa_newest_version(cxt->profile);
- /*
- * Whether or not replacement succeeds, use newest profile so
- * there is no need to update it after replacement.
- */
- if (unlikely((cxt->profile != profile)))
+ if (PROFILE_INVALID(cxt->profile)) {
+ profile = aa_get_newest_profile(cxt->profile);
aa_replace_current_profile(profile);
+ aa_put_profile(profile);
+ cxt = current_cxt();
+ }
- return profile;
+ return cxt->profile;
}
/**
diff --git a/security/apparmor/include/crypto.h b/security/apparmor/include/crypto.h
new file mode 100644
index 0000000..dc418e5
--- /dev/null
+++ b/security/apparmor/include/crypto.h
@@ -0,0 +1,36 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor policy loading interface function definitions.
+ *
+ * Copyright 2013 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#ifndef __APPARMOR_CRYPTO_H
+#define __APPARMOR_CRYPTO_H
+
+#include "policy.h"
+
+#ifdef CONFIG_SECURITY_APPARMOR_HASH
+unsigned int aa_hash_size(void);
+int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
+ size_t len);
+#else
+static inline int aa_calc_profile_hash(struct aa_profile *profile, u32 version,
+ void *start, size_t len)
+{
+ return 0;
+}
+
+static inline unsigned int aa_hash_size(void)
+{
+ return 0;
+}
+#endif
+
+#endif /* __APPARMOR_CRYPTO_H */
diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h
index b25491a..f2d4b63 100644
--- a/security/apparmor/include/policy.h
+++ b/security/apparmor/include/policy.h
@@ -29,8 +29,8 @@
#include "file.h"
#include "resource.h"
-extern const char *const profile_mode_names[];
-#define APPARMOR_NAMES_MAX_INDEX 3
+extern const char *const aa_profile_mode_names[];
+#define APPARMOR_MODE_NAMES_MAX_INDEX 4
#define PROFILE_MODE(_profile, _mode) \
((aa_g_profile_mode == (_mode)) || \
@@ -42,6 +42,10 @@ extern const char *const profile_mode_names[];
#define PROFILE_IS_HAT(_profile) ((_profile)->flags & PFLAG_HAT)
+#define PROFILE_INVALID(_profile) ((_profile)->flags & PFLAG_INVALID)
+
+#define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)
+
/*
* FIXME: currently need a clean way to replace and remove profiles as a
* set. It should be done at the namespace level.
@@ -52,17 +56,19 @@ enum profile_mode {
APPARMOR_ENFORCE, /* enforce access rules */
APPARMOR_COMPLAIN, /* allow and log access violations */
APPARMOR_KILL, /* kill task on access violation */
+ APPARMOR_UNCONFINED, /* profile set to unconfined */
};
enum profile_flags {
PFLAG_HAT = 1, /* profile is a hat */
- PFLAG_UNCONFINED = 2, /* profile is an unconfined profile */
PFLAG_NULL = 4, /* profile is null learning profile */
PFLAG_IX_ON_NAME_ERROR = 8, /* fallback to ix on name lookup fail */
PFLAG_IMMUTABLE = 0x10, /* don't allow changes/replacement */
PFLAG_USER_DEFINED = 0x20, /* user based profile - lower privs */
PFLAG_NO_LIST_REF = 0x40, /* list doesn't keep profile ref */
PFLAG_OLD_NULL_TRANS = 0x100, /* use // as the null transition */
+ PFLAG_INVALID = 0x200, /* profile replaced/removed */
+ PFLAG_NS_COUNT = 0x400, /* carries NS ref count */
/* These flags must correspond with PATH_flags */
PFLAG_MEDIATE_DELETED = 0x10000, /* mediate instead delegate deleted */
@@ -73,14 +79,12 @@ struct aa_profile;
/* struct aa_policy - common part of both namespaces and profiles
* @name: name of the object
* @hname - The hierarchical name
- * @count: reference count of the obj
* @list: list policy object is on
* @profiles: head of the profiles list contained in the object
*/
struct aa_policy {
char *name;
char *hname;
- struct kref count;
struct list_head list;
struct list_head profiles;
};
@@ -106,6 +110,8 @@ struct aa_ns_acct {
* @unconfined: special unconfined profile for the namespace
* @sub_ns: list of namespaces under the current namespace.
* @uniq_null: uniq value used for null learning profiles
+ * @uniq_id: a unique id count for the profiles in the namespace
+ * @dents: dentries for the namespaces file entries in apparmorfs
*
* An aa_namespace defines the set profiles that are searched to determine
* which profile to attach to a task. Profiles can not be shared between
@@ -124,11 +130,14 @@ struct aa_ns_acct {
struct aa_namespace {
struct aa_policy base;
struct aa_namespace *parent;
- rwlock_t lock;
+ struct mutex lock;
struct aa_ns_acct acct;
struct aa_profile *unconfined;
struct list_head sub_ns;
atomic_t uniq_null;
+ long uniq_id;
+
+ struct dentry *dents[AAFS_NS_SIZEOF];
};
/* struct aa_policydb - match engine for a policy
@@ -142,12 +151,21 @@ struct aa_policydb {
};
+struct aa_replacedby {
+ struct kref count;
+ struct aa_profile __rcu *profile;
+};
+
+
/* struct aa_profile - basic confinement data
* @base - base components of the profile (name, refcount, lists, lock ...)
+ * @count: reference count of the obj
+ * @rcu: rcu head used when removing from @list
* @parent: parent of profile
* @ns: namespace the profile is in
* @replacedby: is set to the profile that replaced this profile
* @rename: optional profile name that this profile renamed
+ * @attach: human readable attachment string
* @xmatch: optional extended matching for unconfined executables names
* @xmatch_len: xmatch prefix len, used to determine xmatch priority
* @audit: the auditing mode of the profile
@@ -160,13 +178,15 @@ struct aa_policydb {
* @caps: capabilities for the profile
* @rlimits: rlimits for the profile
*
+ * @dents: dentries for the profiles file entries in apparmorfs
+ * @dirname: name of the profile dir in apparmorfs
+ *
* The AppArmor profile contains the basic confinement data. Each profile
* has a name, and exists in a namespace. The @name and @exec_match are
* used to determine profile attachment against unconfined tasks. All other
* attachments are determined by profile X transition rules.
*
- * The @replacedby field is write protected by the profile lock. Reads
- * are assumed to be atomic, and are done without locking.
+ * The @replacedby struct is write protected by the profile lock.
*
* Profiles have a hierarchy where hats and children profiles keep
* a reference to their parent.
@@ -177,17 +197,20 @@ struct aa_policydb {
*/
struct aa_profile {
struct aa_policy base;
- struct aa_profile *parent;
+ struct kref count;
+ struct rcu_head rcu;
+ struct aa_profile __rcu *parent;
struct aa_namespace *ns;
- struct aa_profile *replacedby;
+ struct aa_replacedby *replacedby;
const char *rename;
+ const char *attach;
struct aa_dfa *xmatch;
int xmatch_len;
enum audit_mode audit;
- enum profile_mode mode;
- u32 flags;
+ long mode;
+ long flags;
u32 path_flags;
int size;
@@ -195,6 +218,10 @@ struct aa_profile {
struct aa_file_rules file;
struct aa_caps caps;
struct aa_rlimit rlimits;
+
+ unsigned char *hash;
+ char *dirname;
+ struct dentry *dents[AAFS_PROF_SIZEOF];
};
extern struct aa_namespace *root_ns;
@@ -211,43 +238,11 @@ void aa_free_namespace_kref(struct kref *kref);
struct aa_namespace *aa_find_namespace(struct aa_namespace *root,
const char *name);
-static inline struct aa_policy *aa_get_common(struct aa_policy *c)
-{
- if (c)
- kref_get(&c->count);
-
- return c;
-}
-
-/**
- * aa_get_namespace - increment references count on @ns
- * @ns: namespace to increment reference count of (MAYBE NULL)
- *
- * Returns: pointer to @ns, if @ns is NULL returns NULL
- * Requires: @ns must be held with valid refcount when called
- */
-static inline struct aa_namespace *aa_get_namespace(struct aa_namespace *ns)
-{
- if (ns)
- kref_get(&(ns->base.count));
-
- return ns;
-}
-
-/**
- * aa_put_namespace - decrement refcount on @ns
- * @ns: namespace to put reference of
- *
- * Decrement reference count of @ns and if no longer in use free it
- */
-static inline void aa_put_namespace(struct aa_namespace *ns)
-{
- if (ns)
- kref_put(&ns->base.count, aa_free_namespace_kref);
-}
+void aa_free_replacedby_kref(struct kref *kref);
struct aa_profile *aa_alloc_profile(const char *name);
struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat);
+void aa_free_profile(struct aa_profile *profile);
void aa_free_profile_kref(struct kref *kref);
struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *name);
@@ -259,25 +254,13 @@ ssize_t aa_remove_profiles(char *name, size_t size);
#define PROF_ADD 1
#define PROF_REPLACE 0
-#define unconfined(X) ((X)->flags & PFLAG_UNCONFINED)
+#define unconfined(X) ((X)->mode == APPARMOR_UNCONFINED)
-/**
- * aa_newest_version - find the newest version of @profile
- * @profile: the profile to check for newer versions of (NOT NULL)
- *
- * Returns: newest version of @profile, if @profile is the newest version
- * return @profile.
- *
- * NOTE: the profile returned is not refcounted, The refcount on @profile
- * must be held until the caller decides what to do with the returned newest
- * version.
- */
-static inline struct aa_profile *aa_newest_version(struct aa_profile *profile)
-{
- while (profile->replacedby)
- profile = profile->replacedby;
- return profile;
+static inline struct aa_profile *aa_deref_parent(struct aa_profile *p)
+{
+ return rcu_dereference_protected(p->parent,
+ mutex_is_locked(&p->ns->lock));
}
/**
@@ -290,19 +273,124 @@ static inline struct aa_profile *aa_newest_version(struct aa_profile *profile)
static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
{
if (p)
- kref_get(&(p->base.count));
+ kref_get(&(p->count));
return p;
}
/**
+ * aa_get_profile_not0 - increment refcount on profile @p found via lookup
+ * @p: profile (MAYBE NULL)
+ *
+ * Returns: pointer to @p if @p is NULL will return NULL
+ * Requires: @p must be held with valid refcount when called
+ */
+static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p)
+{
+ if (p && kref_get_not0(&p->count))
+ return p;
+
+ return NULL;
+}
+
+/**
+ * aa_get_profile_rcu - increment a refcount profile that can be replaced
+ * @p: pointer to profile that can be replaced (NOT NULL)
+ *
+ * Returns: pointer to a refcounted profile.
+ * else NULL if no profile
+ */
+static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p)
+{
+ struct aa_profile *c;
+
+ rcu_read_lock();
+ do {
+ c = rcu_dereference(*p);
+ } while (c && !kref_get_not0(&c->count));
+ rcu_read_unlock();
+
+ return c;
+}
+
+/**
+ * aa_get_newest_profile - find the newest version of @profile
+ * @profile: the profile to check for newer versions of
+ *
+ * Returns: refcounted newest version of @profile taking into account
+ * replacement, renames and removals
+ * return @profile.
+ */
+static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p)
+{
+ if (!p)
+ return NULL;
+
+ if (PROFILE_INVALID(p))
+ return aa_get_profile_rcu(&p->replacedby->profile);
+
+ return aa_get_profile(p);
+}
+
+/**
* aa_put_profile - decrement refcount on profile @p
* @p: profile (MAYBE NULL)
*/
static inline void aa_put_profile(struct aa_profile *p)
{
if (p)
- kref_put(&p->base.count, aa_free_profile_kref);
+ kref_put(&p->count, aa_free_profile_kref);
+}
+
+static inline struct aa_replacedby *aa_get_replacedby(struct aa_replacedby *p)
+{
+ if (p)
+ kref_get(&(p->count));
+
+ return p;
+}
+
+static inline void aa_put_replacedby(struct aa_replacedby *p)
+{
+ if (p)
+ kref_put(&p->count, aa_free_replacedby_kref);
+}
+
+/* requires profile list write lock held */
+static inline void __aa_update_replacedby(struct aa_profile *orig,
+ struct aa_profile *new)
+{
+ struct aa_profile *tmp = rcu_dereference(orig->replacedby->profile);
+ rcu_assign_pointer(orig->replacedby->profile, aa_get_profile(new));
+ orig->flags |= PFLAG_INVALID;
+ aa_put_profile(tmp);
+}
+
+/**
+ * aa_get_namespace - increment references count on @ns
+ * @ns: namespace to increment reference count of (MAYBE NULL)
+ *
+ * Returns: pointer to @ns, if @ns is NULL returns NULL
+ * Requires: @ns must be held with valid refcount when called
+ */
+static inline struct aa_namespace *aa_get_namespace(struct aa_namespace *ns)
+{
+ if (ns)
+ aa_get_profile(ns->unconfined);
+
+ return ns;
+}
+
+/**
+ * aa_put_namespace - decrement refcount on @ns
+ * @ns: namespace to put reference of
+ *
+ * Decrement reference count of @ns and if no longer in use free it
+ */
+static inline void aa_put_namespace(struct aa_namespace *ns)
+{
+ if (ns)
+ aa_put_profile(ns->unconfined);
}
static inline int AUDIT_MODE(struct aa_profile *profile)
diff --git a/security/apparmor/include/policy_unpack.h b/security/apparmor/include/policy_unpack.h
index a2dccca..c214fb8 100644
--- a/security/apparmor/include/policy_unpack.h
+++ b/security/apparmor/include/policy_unpack.h
@@ -15,6 +15,25 @@
#ifndef __POLICY_INTERFACE_H
#define __POLICY_INTERFACE_H
-struct aa_profile *aa_unpack(void *udata, size_t size, const char **ns);
+#include <linux/list.h>
+
+struct aa_load_ent {
+ struct list_head list;
+ struct aa_profile *new;
+ struct aa_profile *old;
+ struct aa_profile *rename;
+};
+
+void aa_load_ent_free(struct aa_load_ent *ent);
+struct aa_load_ent *aa_load_ent_alloc(void);
+
+#define PACKED_FLAG_HAT 1
+
+#define PACKED_MODE_ENFORCE 0
+#define PACKED_MODE_COMPLAIN 1
+#define PACKED_MODE_KILL 2
+#define PACKED_MODE_UNCONFINED 3
+
+int aa_unpack(void *udata, size_t size, struct list_head *lh, const char **ns);
#endif /* __POLICY_INTERFACE_H */
diff --git a/security/apparmor/lib.c b/security/apparmor/lib.c
index fcfe023..6968992 100644
--- a/security/apparmor/lib.c
+++ b/security/apparmor/lib.c
@@ -97,11 +97,6 @@ void *__aa_kvmalloc(size_t size, gfp_t flags)
if (size <= (16*PAGE_SIZE))
buffer = kmalloc(size, flags | GFP_NOIO | __GFP_NOWARN);
if (!buffer) {
- /* see kvfree for why size must be at least work_struct size
- * when allocated via vmalloc
- */
- if (size < sizeof(struct work_struct))
- size = sizeof(struct work_struct);
if (flags & __GFP_ZERO)
buffer = vzalloc(size);
else
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index e3a704c..fb99e18 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -508,19 +508,21 @@ static int apparmor_getprocattr(struct task_struct *task, char *name,
/* released below */
const struct cred *cred = get_task_cred(task);
struct aa_task_cxt *cxt = cred_cxt(cred);
+ struct aa_profile *profile = NULL;
if (strcmp(name, "current") == 0)
- error = aa_getprocattr(aa_newest_version(cxt->profile),
- value);
+ profile = aa_get_newest_profile(cxt->profile);
else if (strcmp(name, "prev") == 0 && cxt->previous)
- error = aa_getprocattr(aa_newest_version(cxt->previous),
- value);
+ profile = aa_get_newest_profile(cxt->previous);
else if (strcmp(name, "exec") == 0 && cxt->onexec)
- error = aa_getprocattr(aa_newest_version(cxt->onexec),
- value);
+ profile = aa_get_newest_profile(cxt->onexec);
else
error = -EINVAL;
+ if (profile)
+ error = aa_getprocattr(profile, value);
+
+ aa_put_profile(profile);
put_cred(cred);
return error;
@@ -744,7 +746,7 @@ module_param_named(paranoid_load, aa_g_paranoid_load, aabool,
/* Boot time disable flag */
static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
-module_param_named(enabled, apparmor_enabled, aabool, S_IRUSR);
+module_param_named(enabled, apparmor_enabled, bool, S_IRUGO);
static int __init apparmor_enabled_setup(char *str)
{
@@ -843,7 +845,7 @@ static int param_get_mode(char *buffer, struct kernel_param *kp)
if (!apparmor_enabled)
return -EINVAL;
- return sprintf(buffer, "%s", profile_mode_names[aa_g_profile_mode]);
+ return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
}
static int param_set_mode(const char *val, struct kernel_param *kp)
@@ -858,8 +860,8 @@ static int param_set_mode(const char *val, struct kernel_param *kp)
if (!val)
return -EINVAL;
- for (i = 0; i < APPARMOR_NAMES_MAX_INDEX; i++) {
- if (strcmp(val, profile_mode_names[i]) == 0) {
+ for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) {
+ if (strcmp(val, aa_profile_mode_names[i]) == 0) {
aa_g_profile_mode = i;
return 0;
}
diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index 0f345c4..6172509 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -92,10 +92,11 @@
/* root profile namespace */
struct aa_namespace *root_ns;
-const char *const profile_mode_names[] = {
+const char *const aa_profile_mode_names[] = {
"enforce",
"complain",
"kill",
+ "unconfined",
};
/**
@@ -141,7 +142,6 @@ static bool policy_init(struct aa_policy *policy, const char *prefix,
policy->name = (char *)hname_tail(policy->hname);
INIT_LIST_HEAD(&policy->list);
INIT_LIST_HEAD(&policy->profiles);
- kref_init(&policy->count);
return 1;
}
@@ -153,13 +153,13 @@ static bool policy_init(struct aa_policy *policy, const char *prefix,
static void policy_destroy(struct aa_policy *policy)
{
/* still contains profiles -- invalid */
- if (!list_empty(&policy->profiles)) {
+ if (on_list_rcu(&policy->profiles)) {
AA_ERROR("%s: internal error, "
"policy '%s' still contains profiles\n",
__func__, policy->name);
BUG();
}
- if (!list_empty(&policy->list)) {
+ if (on_list_rcu(&policy->list)) {
AA_ERROR("%s: internal error, policy '%s' still on list\n",
__func__, policy->name);
BUG();
@@ -174,7 +174,7 @@ static void policy_destroy(struct aa_policy *policy)
* @head: list to search (NOT NULL)
* @name: name to search for (NOT NULL)
*
- * Requires: correct locks for the @head list be held
+ * Requires: rcu_read_lock be held
*
* Returns: unrefcounted policy that match @name or NULL if not found
*/
@@ -182,7 +182,7 @@ static struct aa_policy *__policy_find(struct list_head *head, const char *name)
{
struct aa_policy *policy;
- list_for_each_entry(policy, head, list) {
+ list_for_each_entry_rcu(policy, head, list) {
if (!strcmp(policy->name, name))
return policy;
}
@@ -195,7 +195,7 @@ static struct aa_policy *__policy_find(struct list_head *head, const char *name)
* @str: string to search for (NOT NULL)
* @len: length of match required
*
- * Requires: correct locks for the @head list be held
+ * Requires: rcu_read_lock be held
*
* Returns: unrefcounted policy that match @str or NULL if not found
*
@@ -207,7 +207,7 @@ static struct aa_policy *__policy_strn_find(struct list_head *head,
{
struct aa_policy *policy;
- list_for_each_entry(policy, head, list) {
+ list_for_each_entry_rcu(policy, head, list) {
if (aa_strneq(policy->name, str, len))
return policy;
}
@@ -284,22 +284,19 @@ static struct aa_namespace *alloc_namespace(const char *prefix,
goto fail_ns;
INIT_LIST_HEAD(&ns->sub_ns);
- rwlock_init(&ns->lock);
+ mutex_init(&ns->lock);
/* released by free_namespace */
ns->unconfined = aa_alloc_profile("unconfined");
if (!ns->unconfined)
goto fail_unconfined;
- ns->unconfined->flags = PFLAG_UNCONFINED | PFLAG_IX_ON_NAME_ERROR |
- PFLAG_IMMUTABLE;
+ ns->unconfined->flags = PFLAG_IX_ON_NAME_ERROR |
+ PFLAG_IMMUTABLE | PFLAG_NS_COUNT;
+ ns->unconfined->mode = APPARMOR_UNCONFINED;
- /*
- * released by free_namespace, however __remove_namespace breaks
- * the cyclic references (ns->unconfined, and unconfined->ns) and
- * replaces with refs to parent namespace unconfined
- */
- ns->unconfined->ns = aa_get_namespace(ns);
+ /* ns and ns->unconfined share ns->unconfined refcount */
+ ns->unconfined->ns = ns;
atomic_set(&ns->uniq_null, 0);
@@ -327,30 +324,19 @@ static void free_namespace(struct aa_namespace *ns)
policy_destroy(&ns->base);
aa_put_namespace(ns->parent);
- if (ns->unconfined && ns->unconfined->ns == ns)
- ns->unconfined->ns = NULL;
-
- aa_put_profile(ns->unconfined);
+ ns->unconfined->ns = NULL;
+ aa_free_profile(ns->unconfined);
kzfree(ns);
}
/**
- * aa_free_namespace_kref - free aa_namespace by kref (see aa_put_namespace)
- * @kr: kref callback for freeing of a namespace (NOT NULL)
- */
-void aa_free_namespace_kref(struct kref *kref)
-{
- free_namespace(container_of(kref, struct aa_namespace, base.count));
-}
-
-/**
* __aa_find_namespace - find a namespace on a list by @name
* @head: list to search for namespace on (NOT NULL)
* @name: name of namespace to look for (NOT NULL)
*
* Returns: unrefcounted namespace
*
- * Requires: ns lock be held
+ * Requires: rcu_read_lock be held
*/
static struct aa_namespace *__aa_find_namespace(struct list_head *head,
const char *name)
@@ -373,9 +359,9 @@ struct aa_namespace *aa_find_namespace(struct aa_namespace *root,
{
struct aa_namespace *ns = NULL;
- read_lock(&root->lock);
+ rcu_read_lock();
ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name));
- read_unlock(&root->lock);
+ rcu_read_unlock();
return ns;
}
@@ -392,7 +378,7 @@ static struct aa_namespace *aa_prepare_namespace(const char *name)
root = aa_current_profile()->ns;
- write_lock(&root->lock);
+ mutex_lock(&root->lock);
/* if name isn't specified the profile is loaded to the current ns */
if (!name) {
@@ -405,31 +391,23 @@ static struct aa_namespace *aa_prepare_namespace(const char *name)
/* released by caller */
ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name));
if (!ns) {
- /* namespace not found */
- struct aa_namespace *new_ns;
- write_unlock(&root->lock);
- new_ns = alloc_namespace(root->base.hname, name);
- if (!new_ns)
- return NULL;
- write_lock(&root->lock);
- /* test for race when new_ns was allocated */
- ns = __aa_find_namespace(&root->sub_ns, name);
- if (!ns) {
- /* add parent ref */
- new_ns->parent = aa_get_namespace(root);
-
- list_add(&new_ns->base.list, &root->sub_ns);
- /* add list ref */
- ns = aa_get_namespace(new_ns);
- } else {
- /* raced so free the new one */
- free_namespace(new_ns);
- /* get reference on namespace */
- aa_get_namespace(ns);
+ ns = alloc_namespace(root->base.hname, name);
+ if (!ns)
+ goto out;
+ if (__aa_fs_namespace_mkdir(ns, ns_subns_dir(root), name)) {
+ AA_ERROR("Failed to create interface for ns %s\n",
+ ns->base.name);
+ free_namespace(ns);
+ ns = NULL;
+ goto out;
}
+ ns->parent = aa_get_namespace(root);
+ list_add_rcu(&ns->base.list, &root->sub_ns);
+ /* add list ref */
+ aa_get_namespace(ns);
}
out:
- write_unlock(&root->lock);
+ mutex_unlock(&root->lock);
/* return ref */
return ns;
@@ -447,7 +425,7 @@ out:
static void __list_add_profile(struct list_head *list,
struct aa_profile *profile)
{
- list_add(&profile->base.list, list);
+ list_add_rcu(&profile->base.list, list);
/* get list reference */
aa_get_profile(profile);
}
@@ -466,49 +444,8 @@ static void __list_add_profile(struct list_head *list,
*/
static void __list_remove_profile(struct aa_profile *profile)
{
- list_del_init(&profile->base.list);
- if (!(profile->flags & PFLAG_NO_LIST_REF))
- /* release list reference */
- aa_put_profile(profile);
-}
-
-/**
- * __replace_profile - replace @old with @new on a list
- * @old: profile to be replaced (NOT NULL)
- * @new: profile to replace @old with (NOT NULL)
- *
- * Will duplicate and refcount elements that @new inherits from @old
- * and will inherit @old children.
- *
- * refcount @new for list, put @old list refcount
- *
- * Requires: namespace list lock be held, or list not be shared
- */
-static void __replace_profile(struct aa_profile *old, struct aa_profile *new)
-{
- struct aa_policy *policy;
- struct aa_profile *child, *tmp;
-
- if (old->parent)
- policy = &old->parent->base;
- else
- policy = &old->ns->base;
-
- /* released when @new is freed */
- new->parent = aa_get_profile(old->parent);
- new->ns = aa_get_namespace(old->ns);
- __list_add_profile(&policy->profiles, new);
- /* inherit children */
- list_for_each_entry_safe(child, tmp, &old->base.profiles, base.list) {
- aa_put_profile(child->parent);
- child->parent = aa_get_profile(new);
- /* list refcount transferred to @new*/
- list_move(&child->base.list, &new->base.profiles);
- }
-
- /* released by free_profile */
- old->replacedby = aa_get_profile(new);
- __list_remove_profile(old);
+ list_del_rcu(&profile->base.list);
+ aa_put_profile(profile);
}
static void __profile_list_release(struct list_head *head);
@@ -524,7 +461,8 @@ static void __remove_profile(struct aa_profile *profile)
/* release any children lists first */
__profile_list_release(&profile->base.profiles);
/* released by free_profile */
- profile->replacedby = aa_get_profile(profile->ns->unconfined);
+ __aa_update_replacedby(profile, profile->ns->unconfined);
+ __aa_fs_profile_rmdir(profile);
__list_remove_profile(profile);
}
@@ -552,14 +490,17 @@ static void destroy_namespace(struct aa_namespace *ns)
if (!ns)
return;
- write_lock(&ns->lock);
+ mutex_lock(&ns->lock);
/* release all profiles in this namespace */
__profile_list_release(&ns->base.profiles);
/* release all sub namespaces */
__ns_list_release(&ns->sub_ns);
- write_unlock(&ns->lock);
+ if (ns->parent)
+ __aa_update_replacedby(ns->unconfined, ns->parent->unconfined);
+ __aa_fs_namespace_rmdir(ns);
+ mutex_unlock(&ns->lock);
}
/**
@@ -570,25 +511,9 @@ static void destroy_namespace(struct aa_namespace *ns)
*/
static void __remove_namespace(struct aa_namespace *ns)
{
- struct aa_profile *unconfined = ns->unconfined;
-
/* remove ns from namespace list */
- list_del_init(&ns->base.list);
-
- /*
- * break the ns, unconfined profile cyclic reference and forward
- * all new unconfined profiles requests to the parent namespace
- * This will result in all confined tasks that have a profile
- * being removed, inheriting the parent->unconfined profile.
- */
- if (ns->parent)
- ns->unconfined = aa_get_profile(ns->parent->unconfined);
-
+ list_del_rcu(&ns->base.list);
destroy_namespace(ns);
-
- /* release original ns->unconfined ref */
- aa_put_profile(unconfined);
- /* release ns->base.list ref, from removal above */
aa_put_namespace(ns);
}
@@ -634,8 +559,25 @@ void __init aa_free_root_ns(void)
aa_put_namespace(ns);
}
+
+static void free_replacedby(struct aa_replacedby *r)
+{
+ if (r) {
+ aa_put_profile(rcu_dereference(r->profile));
+ kzfree(r);
+ }
+}
+
+
+void aa_free_replacedby_kref(struct kref *kref)
+{
+ struct aa_replacedby *r = container_of(kref, struct aa_replacedby,
+ count);
+ free_replacedby(r);
+}
+
/**
- * free_profile - free a profile
+ * aa_free_profile - free a profile
* @profile: the profile to free (MAYBE NULL)
*
* Free a profile, its hats and null_profile. All references to the profile,
@@ -644,25 +586,16 @@ void __init aa_free_root_ns(void)
* If the profile was referenced from a task context, free_profile() will
* be called from an rcu callback routine, so we must not sleep here.
*/
-static void free_profile(struct aa_profile *profile)
+void aa_free_profile(struct aa_profile *profile)
{
- struct aa_profile *p;
-
AA_DEBUG("%s(%p)\n", __func__, profile);
if (!profile)
return;
- if (!list_empty(&profile->base.list)) {
- AA_ERROR("%s: internal error, "
- "profile '%s' still on ns list\n",
- __func__, profile->base.name);
- BUG();
- }
-
/* free children profiles */
policy_destroy(&profile->base);
- aa_put_profile(profile->parent);
+ aa_put_profile(rcu_access_pointer(profile->parent));
aa_put_namespace(profile->ns);
kzfree(profile->rename);
@@ -671,44 +604,35 @@ static void free_profile(struct aa_profile *profile)
aa_free_cap_rules(&profile->caps);
aa_free_rlimit_rules(&profile->rlimits);
+ kzfree(profile->dirname);
aa_put_dfa(profile->xmatch);
aa_put_dfa(profile->policy.dfa);
-
- /* put the profile reference for replacedby, but not via
- * put_profile(kref_put).
- * replacedby can form a long chain that can result in cascading
- * frees that blows the stack because kref_put makes a nested fn
- * call (it looks like recursion, with free_profile calling
- * free_profile) for each profile in the chain lp#1056078.
- */
- for (p = profile->replacedby; p; ) {
- if (atomic_dec_and_test(&p->base.count.refcount)) {
- /* no more refs on p, grab its replacedby */
- struct aa_profile *next = p->replacedby;
- /* break the chain */
- p->replacedby = NULL;
- /* now free p, chain is broken */
- free_profile(p);
-
- /* follow up with next profile in the chain */
- p = next;
- } else
- break;
- }
+ aa_put_replacedby(profile->replacedby);
kzfree(profile);
}
/**
+ * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref)
+ * @head: rcu_head callback for freeing of a profile (NOT NULL)
+ */
+static void aa_free_profile_rcu(struct rcu_head *head)
+{
+ struct aa_profile *p = container_of(head, struct aa_profile, rcu);
+ if (p->flags & PFLAG_NS_COUNT)
+ free_namespace(p->ns);
+ else
+ aa_free_profile(p);
+}
+
+/**
* aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile)
* @kr: kref callback for freeing of a profile (NOT NULL)
*/
void aa_free_profile_kref(struct kref *kref)
{
- struct aa_profile *p = container_of(kref, struct aa_profile,
- base.count);
-
- free_profile(p);
+ struct aa_profile *p = container_of(kref, struct aa_profile, count);
+ call_rcu(&p->rcu, aa_free_profile_rcu);
}
/**
@@ -726,13 +650,23 @@ struct aa_profile *aa_alloc_profile(const char *hname)
if (!profile)
return NULL;
- if (!policy_init(&profile->base, NULL, hname)) {
- kzfree(profile);
- return NULL;
- }
+ profile->replacedby = kzalloc(sizeof(struct aa_replacedby), GFP_KERNEL);
+ if (!profile->replacedby)
+ goto fail;
+ kref_init(&profile->replacedby->count);
+
+ if (!policy_init(&profile->base, NULL, hname))
+ goto fail;
+ kref_init(&profile->count);
/* refcount released by caller */
return profile;
+
+fail:
+ kzfree(profile->replacedby);
+ kzfree(profile);
+
+ return NULL;
}
/**
@@ -772,12 +706,12 @@ struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat)
profile->flags |= PFLAG_HAT;
/* released on free_profile */
- profile->parent = aa_get_profile(parent);
+ rcu_assign_pointer(profile->parent, aa_get_profile(parent));
profile->ns = aa_get_namespace(parent->ns);
- write_lock(&profile->ns->lock);
+ mutex_lock(&profile->ns->lock);
__list_add_profile(&parent->base.profiles, profile);
- write_unlock(&profile->ns->lock);
+ mutex_unlock(&profile->ns->lock);
/* refcount released by caller */
return profile;
@@ -793,7 +727,7 @@ fail:
* @head: list to search (NOT NULL)
* @name: name of profile (NOT NULL)
*
- * Requires: ns lock protecting list be held
+ * Requires: rcu_read_lock be held
*
* Returns: unrefcounted profile ptr, or NULL if not found
*/
@@ -808,7 +742,7 @@ static struct aa_profile *__find_child(struct list_head *head, const char *name)
* @name: name of profile (NOT NULL)
* @len: length of @name substring to match
*
- * Requires: ns lock protecting list be held
+ * Requires: rcu_read_lock be held
*
* Returns: unrefcounted profile ptr, or NULL if not found
*/
@@ -829,9 +763,9 @@ struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
{
struct aa_profile *profile;
- read_lock(&parent->ns->lock);
+ rcu_read_lock();
profile = aa_get_profile(__find_child(&parent->base.profiles, name));
- read_unlock(&parent->ns->lock);
+ rcu_read_unlock();
/* refcount released by caller */
return profile;
@@ -846,7 +780,7 @@ struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
* that matches hname does not need to exist, in general this
* is used to load a new profile.
*
- * Requires: ns->lock be held
+ * Requires: rcu_read_lock be held
*
* Returns: unrefcounted policy or NULL if not found
*/
@@ -878,7 +812,7 @@ static struct aa_policy *__lookup_parent(struct aa_namespace *ns,
* @base: base list to start looking up profile name from (NOT NULL)
* @hname: hierarchical profile name (NOT NULL)
*
- * Requires: ns->lock be held
+ * Requires: rcu_read_lock be held
*
* Returns: unrefcounted profile pointer or NULL if not found
*
@@ -917,13 +851,15 @@ struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *hname)
{
struct aa_profile *profile;
- read_lock(&ns->lock);
- profile = aa_get_profile(__lookup_profile(&ns->base, hname));
- read_unlock(&ns->lock);
+ rcu_read_lock();
+ do {
+ profile = __lookup_profile(&ns->base, hname);
+ } while (profile && !aa_get_profile_not0(profile));
+ rcu_read_unlock();
/* the unconfined profile is not in the regular profile list */
if (!profile && strcmp(hname, "unconfined") == 0)
- profile = aa_get_profile(ns->unconfined);
+ profile = aa_get_newest_profile(ns->unconfined);
/* refcount released by caller */
return profile;
@@ -953,25 +889,6 @@ static int replacement_allowed(struct aa_profile *profile, int noreplace,
}
/**
- * __add_new_profile - simple wrapper around __list_add_profile
- * @ns: namespace that profile is being added to (NOT NULL)
- * @policy: the policy container to add the profile to (NOT NULL)
- * @profile: profile to add (NOT NULL)
- *
- * add a profile to a list and do other required basic allocations
- */
-static void __add_new_profile(struct aa_namespace *ns, struct aa_policy *policy,
- struct aa_profile *profile)
-{
- if (policy != &ns->base)
- /* released on profile replacement or free_profile */
- profile->parent = aa_get_profile((struct aa_profile *) policy);
- __list_add_profile(&policy->profiles, profile);
- /* released on free_profile */
- profile->ns = aa_get_namespace(ns);
-}
-
-/**
* aa_audit_policy - Do auditing of policy changes
* @op: policy operation being performed
* @gfp: memory allocation flags
@@ -1019,6 +936,121 @@ bool aa_may_manage_policy(int op)
return 1;
}
+static struct aa_profile *__list_lookup_parent(struct list_head *lh,
+ struct aa_profile *profile)
+{
+ const char *base = hname_tail(profile->base.hname);
+ long len = base - profile->base.hname;
+ struct aa_load_ent *ent;
+
+ /* parent won't have trailing // so remove from len */
+ if (len <= 2)
+ return NULL;
+ len -= 2;
+
+ list_for_each_entry(ent, lh, list) {
+ if (ent->new == profile)
+ continue;
+ if (strncmp(ent->new->base.hname, profile->base.hname, len) ==
+ 0 && ent->new->base.hname[len] == 0)
+ return ent->new;
+ }
+
+ return NULL;
+}
+
+/**
+ * __replace_profile - replace @old with @new on a list
+ * @old: profile to be replaced (NOT NULL)
+ * @new: profile to replace @old with (NOT NULL)
+ * @share_replacedby: transfer @old->replacedby to @new
+ *
+ * Will duplicate and refcount elements that @new inherits from @old
+ * and will inherit @old children.
+ *
+ * refcount @new for list, put @old list refcount
+ *
+ * Requires: namespace list lock be held, or list not be shared
+ */
+static void __replace_profile(struct aa_profile *old, struct aa_profile *new,
+ bool share_replacedby)
+{
+ struct aa_profile *child, *tmp;
+
+ if (!list_empty(&old->base.profiles)) {
+ LIST_HEAD(lh);
+ list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu);
+
+ list_for_each_entry_safe(child, tmp, &lh, base.list) {
+ struct aa_profile *p;
+
+ list_del_init(&child->base.list);
+ p = __find_child(&new->base.profiles, child->base.name);
+ if (p) {
+ /* @p replaces @child */
+ __replace_profile(child, p, share_replacedby);
+ continue;
+ }
+
+ /* inherit @child and its children */
+ /* TODO: update hname of inherited children */
+ /* list refcount transferred to @new */
+ p = aa_deref_parent(child);
+ rcu_assign_pointer(child->parent, aa_get_profile(new));
+ list_add_rcu(&child->base.list, &new->base.profiles);
+ aa_put_profile(p);
+ }
+ }
+
+ if (!rcu_access_pointer(new->parent)) {
+ struct aa_profile *parent = aa_deref_parent(old);
+ rcu_assign_pointer(new->parent, aa_get_profile(parent));
+ }
+ __aa_update_replacedby(old, new);
+ if (share_replacedby) {
+ aa_put_replacedby(new->replacedby);
+ new->replacedby = aa_get_replacedby(old->replacedby);
+ } else if (!rcu_access_pointer(new->replacedby->profile))
+ /* aafs interface uses replacedby */
+ rcu_assign_pointer(new->replacedby->profile,
+ aa_get_profile(new));
+ __aa_fs_profile_migrate_dents(old, new);
+
+ if (list_empty(&new->base.list)) {
+ /* new is not on a list already */
+ list_replace_rcu(&old->base.list, &new->base.list);
+ aa_get_profile(new);
+ aa_put_profile(old);
+ } else
+ __list_remove_profile(old);
+}
+
+/**
+ * __lookup_replace - lookup replacement information for a profile
+ * @ns - namespace the lookup occurs in
+ * @hname - name of profile to lookup
+ * @noreplace - true if not replacing an existing profile
+ * @p - Returns: profile to be replaced
+ * @info - Returns: info string on why lookup failed
+ *
+ * Returns: profile to replace (no ref) on success else ptr error
+ */
+static int __lookup_replace(struct aa_namespace *ns, const char *hname,
+ bool noreplace, struct aa_profile **p,
+ const char **info)
+{
+ *p = aa_get_profile(__lookup_profile(&ns->base, hname));
+ if (*p) {
+ int error = replacement_allowed(*p, noreplace, info);
+ if (error) {
+ *info = "profile can not be replaced";
+ return error;
+ }
+ }
+
+ return 0;
+}
+
/**
* aa_replace_profiles - replace profile(s) on the profile list
* @udata: serialized data stream (NOT NULL)
@@ -1033,21 +1065,17 @@ bool aa_may_manage_policy(int op)
*/
ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
{
- struct aa_policy *policy;
- struct aa_profile *old_profile = NULL, *new_profile = NULL;
- struct aa_profile *rename_profile = NULL;
- struct aa_namespace *ns = NULL;
const char *ns_name, *name = NULL, *info = NULL;
+ struct aa_namespace *ns = NULL;
+ struct aa_load_ent *ent, *tmp;
int op = OP_PROF_REPL;
ssize_t error;
+ LIST_HEAD(lh);
/* released below */
- new_profile = aa_unpack(udata, size, &ns_name);
- if (IS_ERR(new_profile)) {
- error = PTR_ERR(new_profile);
- new_profile = NULL;
- goto fail;
- }
+ error = aa_unpack(udata, size, &lh, &ns_name);
+ if (error)
+ goto out;
/* released below */
ns = aa_prepare_namespace(ns_name);
@@ -1058,71 +1086,140 @@ ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
goto fail;
}
- name = new_profile->base.hname;
-
- write_lock(&ns->lock);
- /* no ref on policy only use inside lock */
- policy = __lookup_parent(ns, new_profile->base.hname);
+ mutex_lock(&ns->lock);
+ /* setup parent and ns info */
+ list_for_each_entry(ent, &lh, list) {
+ struct aa_policy *policy;
+
+ name = ent->new->base.hname;
+ error = __lookup_replace(ns, ent->new->base.hname, noreplace,
+ &ent->old, &info);
+ if (error)
+ goto fail_lock;
+
+ if (ent->new->rename) {
+ error = __lookup_replace(ns, ent->new->rename,
+ noreplace, &ent->rename,
+ &info);
+ if (error)
+ goto fail_lock;
+ }
- if (!policy) {
- info = "parent does not exist";
- error = -ENOENT;
- goto audit;
+ /* released when @new is freed */
+ ent->new->ns = aa_get_namespace(ns);
+
+ if (ent->old || ent->rename)
+ continue;
+
+ /* no ref on policy only use inside lock */
+ policy = __lookup_parent(ns, ent->new->base.hname);
+ if (!policy) {
+ struct aa_profile *p;
+ p = __list_lookup_parent(&lh, ent->new);
+ if (!p) {
+ error = -ENOENT;
+ info = "parent does not exist";
+ name = ent->new->base.hname;
+ goto fail_lock;
+ }
+ rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
+ } else if (policy != &ns->base) {
+ /* released on profile replacement or free_profile */
+ struct aa_profile *p = (struct aa_profile *) policy;
+ rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
+ }
}
- old_profile = __find_child(&policy->profiles, new_profile->base.name);
- /* released below */
- aa_get_profile(old_profile);
+ /* create new fs entries for introspection if needed */
+ list_for_each_entry(ent, &lh, list) {
+ if (ent->old) {
+ /* inherit old interface files */
- if (new_profile->rename) {
- rename_profile = __lookup_profile(&ns->base,
- new_profile->rename);
- /* released below */
- aa_get_profile(rename_profile);
+ /* if (ent->rename)
+ TODO: support rename */
+ /* } else if (ent->rename) {
+ TODO: support rename */
+ } else {
+ struct dentry *parent;
+ if (rcu_access_pointer(ent->new->parent)) {
+ struct aa_profile *p;
+ p = aa_deref_parent(ent->new);
+ parent = prof_child_dir(p);
+ } else
+ parent = ns_subprofs_dir(ent->new->ns);
+ error = __aa_fs_profile_mkdir(ent->new, parent);
+ }
- if (!rename_profile) {
- info = "profile to rename does not exist";
- name = new_profile->rename;
- error = -ENOENT;
- goto audit;
+ if (error) {
+ info = "failed to create ";
+ goto fail_lock;
}
}
- error = replacement_allowed(old_profile, noreplace, &info);
- if (error)
- goto audit;
-
- error = replacement_allowed(rename_profile, noreplace, &info);
- if (error)
- goto audit;
-
-audit:
- if (!old_profile && !rename_profile)
- op = OP_PROF_LOAD;
-
- error = audit_policy(op, GFP_ATOMIC, name, info, error);
-
- if (!error) {
- if (rename_profile)
- __replace_profile(rename_profile, new_profile);
- if (old_profile)
- __replace_profile(old_profile, new_profile);
- if (!(old_profile || rename_profile))
- __add_new_profile(ns, policy, new_profile);
+ /* Done with checks that may fail - do actual replacement */
+ 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;
+
+ audit_policy(op, GFP_ATOMIC, ent->new->base.name, NULL, error);
+
+ if (ent->old) {
+ __replace_profile(ent->old, ent->new, 1);
+ if (ent->rename) {
+ /* aafs interface uses replacedby */
+ struct aa_replacedby *r = ent->new->replacedby;
+ rcu_assign_pointer(r->profile,
+ aa_get_profile(ent->new));
+ __replace_profile(ent->rename, ent->new, 0);
+ }
+ } else if (ent->rename) {
+ /* aafs interface uses replacedby */
+ rcu_assign_pointer(ent->new->replacedby->profile,
+ aa_get_profile(ent->new));
+ __replace_profile(ent->rename, ent->new, 0);
+ } else if (ent->new->parent) {
+ struct aa_profile *parent, *newest;
+ parent = aa_deref_parent(ent->new);
+ newest = aa_get_newest_profile(parent);
+
+ /* parent replaced in this atomic set? */
+ if (newest != parent) {
+ aa_get_profile(newest);
+ aa_put_profile(parent);
+ rcu_assign_pointer(ent->new->parent, newest);
+ } else
+ aa_put_profile(newest);
+ /* aafs interface uses replacedby */
+ rcu_assign_pointer(ent->new->replacedby->profile,
+ aa_get_profile(ent->new));
+ __list_add_profile(&parent->base.profiles, ent->new);
+ } else {
+ /* aafs interface uses replacedby */
+ rcu_assign_pointer(ent->new->replacedby->profile,
+ aa_get_profile(ent->new));
+ __list_add_profile(&ns->base.profiles, ent->new);
+ }
+ aa_load_ent_free(ent);
}
- write_unlock(&ns->lock);
+ mutex_unlock(&ns->lock);
out:
aa_put_namespace(ns);
- aa_put_profile(rename_profile);
- aa_put_profile(old_profile);
- aa_put_profile(new_profile);
+
if (error)
return error;
return size;
+fail_lock:
+ mutex_unlock(&ns->lock);
fail:
error = audit_policy(op, GFP_KERNEL, name, info, error);
+
+ list_for_each_entry_safe(ent, tmp, &lh, list) {
+ list_del_init(&ent->list);
+ aa_load_ent_free(ent);
+ }
+
goto out;
}
@@ -1169,12 +1266,12 @@ ssize_t aa_remove_profiles(char *fqname, size_t size)
if (!name) {
/* remove namespace - can only happen if fqname[0] == ':' */
- write_lock(&ns->parent->lock);
+ mutex_lock(&ns->parent->lock);
__remove_namespace(ns);
- write_unlock(&ns->parent->lock);
+ mutex_unlock(&ns->parent->lock);
} else {
/* remove profile */
- write_lock(&ns->lock);
+ mutex_lock(&ns->lock);
profile = aa_get_profile(__lookup_profile(&ns->base, name));
if (!profile) {
error = -ENOENT;
@@ -1183,7 +1280,7 @@ ssize_t aa_remove_profiles(char *fqname, size_t size)
}
name = profile->base.hname;
__remove_profile(profile);
- write_unlock(&ns->lock);
+ mutex_unlock(&ns->lock);
}
/* don't fail removal if audit fails */
@@ -1193,7 +1290,7 @@ ssize_t aa_remove_profiles(char *fqname, size_t size)
return size;
fail_ns_lock:
- write_unlock(&ns->lock);
+ mutex_unlock(&ns->lock);
aa_put_namespace(ns);
fail:
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index 6dac7d7..a689f10 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -24,6 +24,7 @@
#include "include/apparmor.h"
#include "include/audit.h"
#include "include/context.h"
+#include "include/crypto.h"
#include "include/match.h"
#include "include/policy.h"
#include "include/policy_unpack.h"
@@ -333,8 +334,10 @@ static struct aa_dfa *unpack_dfa(struct aa_ext *e)
/*
* The dfa is aligned with in the blob to 8 bytes
* from the beginning of the stream.
+ * alignment adjust needed by dfa unpack
*/
- size_t sz = blob - (char *)e->start;
+ size_t sz = blob - (char *) e->start -
+ ((e->pos - e->start) & 7);
size_t pad = ALIGN(sz, 8) - sz;
int flags = TO_ACCEPT1_FLAG(YYTD_DATA32) |
TO_ACCEPT2_FLAG(YYTD_DATA32);
@@ -490,6 +493,9 @@ static struct aa_profile *unpack_profile(struct aa_ext *e)
/* profile renaming is optional */
(void) unpack_str(e, &profile->rename, "rename");
+ /* attachment string is optional */
+ (void) unpack_str(e, &profile->attach, "attach");
+
/* xmatch is optional and may be NULL */
profile->xmatch = unpack_dfa(e);
if (IS_ERR(profile->xmatch)) {
@@ -509,12 +515,16 @@ static struct aa_profile *unpack_profile(struct aa_ext *e)
goto fail;
if (!unpack_u32(e, &tmp, NULL))
goto fail;
- if (tmp)
+ if (tmp & PACKED_FLAG_HAT)
profile->flags |= PFLAG_HAT;
if (!unpack_u32(e, &tmp, NULL))
goto fail;
- if (tmp)
+ if (tmp == PACKED_MODE_COMPLAIN)
profile->mode = APPARMOR_COMPLAIN;
+ else if (tmp == PACKED_MODE_KILL)
+ profile->mode = APPARMOR_KILL;
+ else if (tmp == PACKED_MODE_UNCONFINED)
+ profile->mode = APPARMOR_UNCONFINED;
if (!unpack_u32(e, &tmp, NULL))
goto fail;
if (tmp)
@@ -614,7 +624,7 @@ fail:
else if (!name)
name = "unknown";
audit_iface(profile, name, "failed to unpack profile", e, error);
- aa_put_profile(profile);
+ aa_free_profile(profile);
return ERR_PTR(error);
}
@@ -622,29 +632,41 @@ fail:
/**
* verify_head - unpack serialized stream header
* @e: serialized data read head (NOT NULL)
+ * @required: whether the header is required or optional
* @ns: Returns - namespace if one is specified else NULL (NOT NULL)
*
* Returns: error or 0 if header is good
*/
-static int verify_header(struct aa_ext *e, const char **ns)
+static int verify_header(struct aa_ext *e, int required, const char **ns)
{
int error = -EPROTONOSUPPORT;
+ const char *name = NULL;
+ *ns = NULL;
+
/* get the interface version */
if (!unpack_u32(e, &e->version, "version")) {
- audit_iface(NULL, NULL, "invalid profile format", e, error);
- return error;
- }
+ if (required) {
+ audit_iface(NULL, NULL, "invalid profile format", e,
+ error);
+ return error;
+ }
- /* check that the interface version is currently supported */
- if (e->version != 5) {
- audit_iface(NULL, NULL, "unsupported interface version", e,
- error);
- return error;
+ /* check that the interface version is currently supported */
+ if (e->version != 5) {
+ audit_iface(NULL, NULL, "unsupported interface version",
+ e, error);
+ return error;
+ }
}
+
/* read the namespace if present */
- if (!unpack_str(e, ns, "namespace"))
- *ns = NULL;
+ if (unpack_str(e, &name, "namespace")) {
+ if (*ns && strcmp(*ns, name))
+ audit_iface(NULL, NULL, "invalid ns change", e, error);
+ else if (!*ns)
+ *ns = name;
+ }
return 0;
}
@@ -693,18 +715,40 @@ static int verify_profile(struct aa_profile *profile)
return 0;
}
+void aa_load_ent_free(struct aa_load_ent *ent)
+{
+ if (ent) {
+ aa_put_profile(ent->rename);
+ aa_put_profile(ent->old);
+ aa_put_profile(ent->new);
+ kzfree(ent);
+ }
+}
+
+struct aa_load_ent *aa_load_ent_alloc(void)
+{
+ struct aa_load_ent *ent = kzalloc(sizeof(*ent), GFP_KERNEL);
+ if (ent)
+ INIT_LIST_HEAD(&ent->list);
+ return ent;
+}
+
/**
- * aa_unpack - unpack packed binary profile data loaded from user space
+ * aa_unpack - unpack packed binary profile(s) data loaded from user space
* @udata: user data copied to kmem (NOT NULL)
* @size: the size of the user data
+ * @lh: list to place unpacked profiles in a aa_repl_ws
* @ns: Returns namespace profile is in if specified else NULL (NOT NULL)
*
- * Unpack user data and return refcounted allocated profile or ERR_PTR
+ * Unpack user data and return refcounted allocated profile(s) stored in
+ * @lh in order of discovery, with the list chain stored in base.list
+ * or error
*
- * Returns: profile else error pointer if fails to unpack
+ * Returns: profile(s) on @lh else error pointer if fails to unpack
*/
-struct aa_profile *aa_unpack(void *udata, size_t size, const char **ns)
+int aa_unpack(void *udata, size_t size, struct list_head *lh, const char **ns)
{
+ struct aa_load_ent *tmp, *ent;
struct aa_profile *profile = NULL;
int error;
struct aa_ext e = {
@@ -713,20 +757,49 @@ struct aa_profile *aa_unpack(void *udata, size_t size, const char **ns)
.pos = udata,
};
- error = verify_header(&e, ns);
- if (error)
- return ERR_PTR(error);
+ *ns = NULL;
+ while (e.pos < e.end) {
+ void *start;
+ error = verify_header(&e, e.pos == e.start, ns);
+ if (error)
+ goto fail;
+
+ start = e.pos;
+ profile = unpack_profile(&e);
+ if (IS_ERR(profile)) {
+ error = PTR_ERR(profile);
+ goto fail;
+ }
+
+ error = verify_profile(profile);
+ if (error)
+ goto fail_profile;
+
+ error = aa_calc_profile_hash(profile, e.version, start,
+ e.pos - start);
+ if (error)
+ goto fail_profile;
+
+ ent = aa_load_ent_alloc();
+ if (!ent) {
+ error = -ENOMEM;
+ goto fail_profile;
+ }
+
+ ent->new = profile;
+ list_add_tail(&ent->list, lh);
+ }
+
+ return 0;
- profile = unpack_profile(&e);
- if (IS_ERR(profile))
- return profile;
+fail_profile:
+ aa_put_profile(profile);
- error = verify_profile(profile);
- if (error) {
- aa_put_profile(profile);
- profile = ERR_PTR(error);
+fail:
+ list_for_each_entry_safe(ent, tmp, lh, list) {
+ list_del_init(&ent->list);
+ aa_load_ent_free(ent);
}
- /* return refcount */
- return profile;
+ return error;
}
diff --git a/security/apparmor/procattr.c b/security/apparmor/procattr.c
index 6c93901..b125acc 100644
--- a/security/apparmor/procattr.c
+++ b/security/apparmor/procattr.c
@@ -37,7 +37,7 @@ int aa_getprocattr(struct aa_profile *profile, char **string)
{
char *str;
int len = 0, mode_len = 0, ns_len = 0, name_len;
- const char *mode_str = profile_mode_names[profile->mode];
+ const char *mode_str = aa_profile_mode_names[profile->mode];
const char *ns_name = NULL;
struct aa_namespace *ns = profile->ns;
struct aa_namespace *current_ns = __aa_current_profile()->ns;
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