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+ Cleanups 

- apparmor: fix spelling mistake: "resoure" -> "resource"
   - apparmor: remove unused redundant variable stop
   - apparmor: Fix bool initialization/comparison
 
 + Bug Fixes
   - apparmor: initialized returned struct aa_perms
   - apparmor: fix leak of null profile name if profile allocation fails
   - apparmor: ensure that undecidable profile attachments fail
   - apparmor: fix profile attachment for special unconfined profiles
   - apparmor: fix locking when creating a new complain profile.
   - apparmor: fix possible recursive lock warning in __aa_create_ns
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Merge tag 'apparmor-pr-2017-11-21' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor

Pull apparmor updates from John Johansen:
 "No features this time, just minor cleanups and bug fixes.

  Cleanups:
   - fix spelling mistake: "resoure" -> "resource"
   - remove unused redundant variable stop
   - Fix bool initialization/comparison

  Bug Fixes:
   - initialized returned struct aa_perms
   - fix leak of null profile name if profile allocation fails
   - ensure that undecidable profile attachments fail
   - fix profile attachment for special unconfined profiles
   - fix locking when creating a new complain profile.
   - fix possible recursive lock warning in __aa_create_ns"

* tag 'apparmor-pr-2017-11-21' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor:
  apparmor: fix possible recursive lock warning in __aa_create_ns
  apparmor: fix locking when creating a new complain profile.
  apparmor: fix profile attachment for special unconfined profiles
  apparmor: ensure that undecidable profile attachments fail
  apparmor: fix leak of null profile name if profile allocation fails
  apparmor: remove unused redundant variable stop
  apparmor: Fix bool initialization/comparison
  apparmor: initialized returned struct aa_perms
  apparmor: fix spelling mistake: "resoure" -> "resource"
This commit is contained in:
Linus Torvalds 2017-11-23 20:48:26 -10:00
parent 5a787756b8 feb3c766a3
commit 26064dea2d
11 changed files with 91 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
security/apparmor/apparmorfs.c
View File

@ -533,7 +533,7 @@ static ssize_t ns_revision_read(struct file *file, char __user *buf,
long last_read;
int avail;
mutex_lock(&rev->ns->lock);
mutex_lock_nested(&rev->ns->lock, rev->ns->level);
last_read = rev->last_read;
if (last_read == rev->ns->revision) {
mutex_unlock(&rev->ns->lock);
@ -543,7 +543,7 @@ static ssize_t ns_revision_read(struct file *file, char __user *buf,
last_read !=
READ_ONCE(rev->ns->revision)))
return -ERESTARTSYS;
mutex_lock(&rev->ns->lock);
mutex_lock_nested(&rev->ns->lock, rev->ns->level);
}
avail = sprintf(buffer, "%ld\n", rev->ns->revision);
@ -577,7 +577,7 @@ static unsigned int ns_revision_poll(struct file *file, poll_table *pt)
unsigned int mask = 0;
if (rev) {
mutex_lock(&rev->ns->lock);
mutex_lock_nested(&rev->ns->lock, rev->ns->level);
poll_wait(file, &rev->ns->wait, pt);
if (rev->last_read < rev->ns->revision)
mask |= POLLIN | POLLRDNORM;
@ -1643,7 +1643,7 @@ static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode)
*/
inode_unlock(dir);
error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
mutex_lock(&parent->lock);
mutex_lock_nested(&parent->lock, parent->level);
inode_lock_nested(dir, I_MUTEX_PARENT);
if (error)
goto out;
@ -1692,7 +1692,7 @@ static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
inode_unlock(dir);
inode_unlock(dentry->d_inode);
mutex_lock(&parent->lock);
mutex_lock_nested(&parent->lock, parent->level);
ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
dentry->d_name.len));
if (!ns) {
@ -1747,7 +1747,7 @@ void __aafs_ns_rmdir(struct aa_ns *ns)
__aafs_profile_rmdir(child);
list_for_each_entry(sub, &ns->sub_ns, base.list) {
mutex_lock(&sub->lock);
mutex_lock_nested(&sub->lock, sub->level);
__aafs_ns_rmdir(sub);
mutex_unlock(&sub->lock);
}
@ -1877,7 +1877,7 @@ int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
/* subnamespaces */
list_for_each_entry(sub, &ns->sub_ns, base.list) {
mutex_lock(&sub->lock);
mutex_lock_nested(&sub->lock, sub->level);
error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
mutex_unlock(&sub->lock);
if (error)
@ -1921,7 +1921,7 @@ static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
/* 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);
mutex_lock_nested(&next->lock, next->level);
return next;
}
@ -1931,7 +1931,7 @@ static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
mutex_unlock(&ns->lock);
next = list_next_entry(ns, base.list);
if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
mutex_lock(&next->lock);
mutex_lock_nested(&next->lock, next->level);
return next;
}
ns = parent;
@ -2039,7 +2039,7 @@ static void *p_start(struct seq_file *f, loff_t *pos)
f->private = root;
/* find the first profile */
mutex_lock(&root->lock);
mutex_lock_nested(&root->lock, root->level);
profile = __first_profile(root, root);
/* skip to position */
@ -2491,7 +2491,7 @@ static int __init aa_create_aafs(void)
ns_subrevision(root_ns) = dent;
/* policy tree referenced by magic policy symlink */
mutex_lock(&root_ns->lock);
mutex_lock_nested(&root_ns->lock, root_ns->level);
error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
aafs_mnt->mnt_root);
mutex_unlock(&root_ns->lock);

68
security/apparmor/domain.c
View File

@ -305,6 +305,7 @@ static int change_profile_perms(struct aa_profile *profile,
* __attach_match_ - find an attachment match
* @name - to match against (NOT NULL)
* @head - profile list to walk (NOT NULL)
* @info - info message if there was an error (NOT NULL)
*
* Do a linear search on the profiles in the list. There is a matching
* preference where an exact match is preferred over a name which uses
@ -316,28 +317,46 @@ static int change_profile_perms(struct aa_profile *profile,
* Returns: profile or NULL if no match found
*/
static struct aa_profile *__attach_match(const char *name,
struct list_head *head)
struct list_head *head,
const char **info)
{
int len = 0;
bool conflict = false;
struct aa_profile *profile, *candidate = NULL;
list_for_each_entry_rcu(profile, head, base.list) {
if (profile->label.flags & FLAG_NULL)
if (profile->label.flags & FLAG_NULL &&
&profile->label == ns_unconfined(profile->ns))
continue;
if (profile->xmatch && profile->xmatch_len > len) {
unsigned int state = aa_dfa_match(profile->xmatch,
DFA_START, name);
u32 perm = dfa_user_allow(profile->xmatch, state);
/* any accepting state means a valid match. */
if (perm & MAY_EXEC) {
candidate = profile;
len = profile->xmatch_len;
if (profile->xmatch) {
if (profile->xmatch_len == len) {
conflict = true;
continue;
} else if (profile->xmatch_len > len) {
unsigned int state;
u32 perm;
state = aa_dfa_match(profile->xmatch,
DFA_START, name);
perm = dfa_user_allow(profile->xmatch, state);
/* any accepting state means a valid match. */
if (perm & MAY_EXEC) {
candidate = profile;
len = profile->xmatch_len;
conflict = false;
}
}
} else if (!strcmp(profile->base.name, name))
/* exact non-re match, no more searching required */
return profile;
}
if (conflict) {
*info = "conflicting profile attachments";
return NULL;
}
return candidate;
}
@ -346,16 +365,17 @@ static struct aa_profile *__attach_match(const char *name,
* @ns: the current namespace (NOT NULL)
* @list: list to search (NOT NULL)
* @name: the executable name to match against (NOT NULL)
* @info: info message if there was an error
*
* Returns: label or NULL if no match found
*/
static struct aa_label *find_attach(struct aa_ns *ns, struct list_head *list,
const char *name)
const char *name, const char **info)
{
struct aa_profile *profile;
rcu_read_lock();
profile = aa_get_profile(__attach_match(name, list));
profile = aa_get_profile(__attach_match(name, list, info));
rcu_read_unlock();
return profile ? &profile->label : NULL;
@ -448,11 +468,11 @@ static struct aa_label *x_to_label(struct aa_profile *profile,
if (xindex & AA_X_CHILD)
/* released by caller */
new = find_attach(ns, &profile->base.profiles,
name);
name, info);
else
/* released by caller */
new = find_attach(ns, &ns->base.profiles,
name);
name, info);
*lookupname = name;
break;
}
@ -516,7 +536,7 @@ static struct aa_label *profile_transition(struct aa_profile *profile,
if (profile_unconfined(profile)) {
new = find_attach(profile->ns, &profile->ns->base.profiles,
name);
name, &info);
if (new) {
AA_DEBUG("unconfined attached to new label");
return new;
@ -541,9 +561,21 @@ static struct aa_label *profile_transition(struct aa_profile *profile,
}
} else if (COMPLAIN_MODE(profile)) {
/* no exec permission - learning mode */
struct aa_profile *new_profile = aa_new_null_profile(profile,
false, name,
GFP_ATOMIC);
struct aa_profile *new_profile = NULL;
char *n = kstrdup(name, GFP_ATOMIC);
if (n) {
/* name is ptr into buffer */
long pos = name - buffer;
/* break per cpu buffer hold */
put_buffers(buffer);
new_profile = aa_new_null_profile(profile, false, n,
GFP_KERNEL);
get_buffers(buffer);
name = buffer + pos;
strcpy((char *)name, n);
kfree(n);
}
if (!new_profile) {
error = -ENOMEM;
info = "could not create null profile";

8
security/apparmor/file.c
View File

@ -226,18 +226,12 @@ static u32 map_old_perms(u32 old)
struct aa_perms aa_compute_fperms(struct aa_dfa *dfa, unsigned int state,
struct path_cond *cond)
{
struct aa_perms perms;
/* FIXME: change over to new dfa format
* currently file perms are encoded in the dfa, new format
* splits the permissions from the dfa. This mapping can be
* done at profile load
*/
perms.deny = 0;
perms.kill = perms.stop = 0;
perms.complain = perms.cond = 0;
perms.hide = 0;
perms.prompt = 0;
struct aa_perms perms = { };
if (uid_eq(current_fsuid(), cond->uid)) {
perms.allow = map_old_perms(dfa_user_allow(dfa, state));

2
security/apparmor/label.c
View File

@ -2115,7 +2115,7 @@ void __aa_labelset_update_subtree(struct aa_ns *ns)
__labelset_update(ns);
list_for_each_entry(child, &ns->sub_ns, base.list) {
mutex_lock(&child->lock);
mutex_lock_nested(&child->lock, child->level);
__aa_labelset_update_subtree(child);
mutex_unlock(&child->lock);
}

16
security/apparmor/lib.c
View File

@ -317,14 +317,11 @@ static u32 map_other(u32 x)
void aa_compute_perms(struct aa_dfa *dfa, unsigned int state,
struct aa_perms *perms)
{
perms->deny = 0;
perms->kill = perms->stop = 0;
perms->complain = perms->cond = 0;
perms->hide = 0;
perms->prompt = 0;
perms->allow = dfa_user_allow(dfa, state);
perms->audit = dfa_user_audit(dfa, state);
perms->quiet = dfa_user_quiet(dfa, state);
*perms = (struct aa_perms) {
.allow = dfa_user_allow(dfa, state),
.audit = dfa_user_audit(dfa, state),
.quiet = dfa_user_quiet(dfa, state),
};
/* for v5 perm mapping in the policydb, the other set is used
* to extend the general perm set
@ -426,7 +423,6 @@ int aa_check_perms(struct aa_profile *profile, struct aa_perms *perms,
void (*cb)(struct audit_buffer *, void *))
{
int type, error;
bool stop = false;
u32 denied = request & (~perms->allow | perms->deny);
if (likely(!denied)) {
@ -447,8 +443,6 @@ int aa_check_perms(struct aa_profile *profile, struct aa_perms *perms,
else
type = AUDIT_APPARMOR_DENIED;
if (denied & perms->stop)
stop = true;
if (denied == (denied & perms->hide))
error = -ENOENT;

8
security/apparmor/lsm.c
View File

@ -846,7 +846,7 @@ module_param_call(audit, param_set_audit, param_get_audit,
/* Determines if audit header is included in audited messages. This
* provides more context if the audit daemon is not running
*/
bool aa_g_audit_header = 1;
bool aa_g_audit_header = true;
module_param_named(audit_header, aa_g_audit_header, aabool,
S_IRUSR | S_IWUSR);
@ -871,7 +871,7 @@ module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
* DEPRECATED: read only as strict checking of load is always done now
* that none root users (user namespaces) can load policy.
*/
bool aa_g_paranoid_load = 1;
bool aa_g_paranoid_load = true;
module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
/* Boot time disable flag */
@ -1119,7 +1119,7 @@ static int __init apparmor_init(void)
if (!apparmor_enabled || !security_module_enable("apparmor")) {
aa_info_message("AppArmor disabled by boot time parameter");
apparmor_enabled = 0;
apparmor_enabled = false;
return 0;
}
@ -1175,7 +1175,7 @@ alloc_out:
aa_destroy_aafs();
aa_teardown_dfa_engine();
apparmor_enabled = 0;
apparmor_enabled = false;
return error;
}

13
security/apparmor/mount.c
View File

@ -216,13 +216,12 @@ static unsigned int match_mnt_flags(struct aa_dfa *dfa, unsigned int state,
static struct aa_perms compute_mnt_perms(struct aa_dfa *dfa,
unsigned int state)
{
struct aa_perms perms;
perms.kill = 0;
perms.allow = dfa_user_allow(dfa, state);
perms.audit = dfa_user_audit(dfa, state);
perms.quiet = dfa_user_quiet(dfa, state);
perms.xindex = dfa_user_xindex(dfa, state);
struct aa_perms perms = {
.allow = dfa_user_allow(dfa, state),
.audit = dfa_user_audit(dfa, state),
.quiet = dfa_user_quiet(dfa, state),
.xindex = dfa_user_xindex(dfa, state),
};
return perms;
}

11
security/apparmor/policy.c
View File

@ -502,7 +502,7 @@ struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat,
{
struct aa_profile *p, *profile;
const char *bname;
char *name;
char *name = NULL;
AA_BUG(!parent);
@ -545,7 +545,7 @@ name:
profile->file.dfa = aa_get_dfa(nulldfa);
profile->policy.dfa = aa_get_dfa(nulldfa);
mutex_lock(&profile->ns->lock);
mutex_lock_nested(&profile->ns->lock, profile->ns->level);
p = __find_child(&parent->base.profiles, bname);
if (p) {
aa_free_profile(profile);
@ -562,6 +562,7 @@ out:
return profile;
fail:
kfree(name);
aa_free_profile(profile);
return NULL;
}
@ -905,7 +906,7 @@ ssize_t aa_replace_profiles(struct aa_ns *policy_ns, struct aa_label *label,
} else
ns = aa_get_ns(policy_ns ? policy_ns : labels_ns(label));
mutex_lock(&ns->lock);
mutex_lock_nested(&ns->lock, ns->level);
/* 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)) {
@ -1116,13 +1117,13 @@ ssize_t aa_remove_profiles(struct aa_ns *policy_ns, struct aa_label *subj,
if (!name) {
/* remove namespace - can only happen if fqname[0] == ':' */
mutex_lock(&ns->parent->lock);
mutex_lock_nested(&ns->parent->lock, ns->level);
__aa_remove_ns(ns);
__aa_bump_ns_revision(ns);
mutex_unlock(&ns->parent->lock);
} else {
/* remove profile */
mutex_lock(&ns->lock);
mutex_lock_nested(&ns->lock, ns->level);
profile = aa_get_profile(__lookup_profile(&ns->base, name));
if (!profile) {
error = -ENOENT;

8
security/apparmor/policy_ns.c
View File

@ -256,7 +256,8 @@ static struct aa_ns *__aa_create_ns(struct aa_ns *parent, const char *name,
ns = alloc_ns(parent->base.hname, name);
if (!ns)
return NULL;
mutex_lock(&ns->lock);
ns->level = parent->level + 1;
mutex_lock_nested(&ns->lock, ns->level);
error = __aafs_ns_mkdir(ns, ns_subns_dir(parent), name, dir);
if (error) {
AA_ERROR("Failed to create interface for ns %s\n",
@ -266,7 +267,6 @@ static struct aa_ns *__aa_create_ns(struct aa_ns *parent, const char *name,
return ERR_PTR(error);
}
ns->parent = aa_get_ns(parent);
ns->level = parent->level + 1;
list_add_rcu(&ns->base.list, &parent->sub_ns);
/* add list ref */
aa_get_ns(ns);
@ -313,7 +313,7 @@ struct aa_ns *aa_prepare_ns(struct aa_ns *parent, const char *name)
{
struct aa_ns *ns;
mutex_lock(&parent->lock);
mutex_lock_nested(&parent->lock, parent->level);
/* try and find the specified ns and if it doesn't exist create it */
/* released by caller */
ns = aa_get_ns(__aa_find_ns(&parent->sub_ns, name));
@ -336,7 +336,7 @@ static void destroy_ns(struct aa_ns *ns)
if (!ns)
return;
mutex_lock(&ns->lock);
mutex_lock_nested(&ns->lock, ns->level);
/* release all profiles in this namespace */
__aa_profile_list_release(&ns->base.profiles);

2
security/apparmor/policy_unpack.c
View File

@ -157,7 +157,7 @@ static void do_loaddata_free(struct work_struct *work)
struct aa_ns *ns = aa_get_ns(d->ns);
if (ns) {
mutex_lock(&ns->lock);
mutex_lock_nested(&ns->lock, ns->level);
__aa_fs_remove_rawdata(d);
mutex_unlock(&ns->lock);
aa_put_ns(ns);

4
security/apparmor/resource.c
View File

@ -47,7 +47,7 @@ static void audit_cb(struct audit_buffer *ab, void *va)
/**
* audit_resource - audit setting resource limit
* @profile: profile being enforced (NOT NULL)
* @resoure: rlimit being auditing
* @resource: rlimit being auditing
* @value: value being set
* @error: error value
*
@ -128,7 +128,7 @@ int aa_task_setrlimit(struct aa_label *label, struct task_struct *task,
error = fn_for_each(label, profile,
audit_resource(profile, resource,
new_rlim->rlim_max, peer,
"cap_sys_resoure", -EACCES));
"cap_sys_resource", -EACCES));
else
error = fn_for_each_confined(label, profile,
profile_setrlimit(profile, resource, new_rlim));