DECLARE_FLEX_ARRAY(char, buffer);
};
+struct aa_local_cache {
+ unsigned int hold;
+ unsigned int count;
+ struct list_head head;
+};
+
#define RESERVE_COUNT 2
static int reserve_count = RESERVE_COUNT;
static int buffer_count;
static LIST_HEAD(aa_global_buffers);
static DEFINE_SPINLOCK(aa_buffers_lock);
+static DEFINE_PER_CPU(struct aa_local_cache, aa_local_buffers);
/*
* LSM hook functions
unsigned int mode)
{
struct aa_label *tracer, *tracee;
+ const struct cred *cred;
int error;
+ cred = get_task_cred(child);
+ tracee = cred_label(cred); /* ref count on cred */
tracer = __begin_current_label_crit_section();
- tracee = aa_get_task_label(child);
- error = aa_may_ptrace(tracer, tracee,
+ error = aa_may_ptrace(current_cred(), tracer, cred, tracee,
(mode & PTRACE_MODE_READ) ? AA_PTRACE_READ
: AA_PTRACE_TRACE);
- aa_put_label(tracee);
__end_current_label_crit_section(tracer);
+ put_cred(cred);
return error;
}
static int apparmor_ptrace_traceme(struct task_struct *parent)
{
struct aa_label *tracer, *tracee;
+ const struct cred *cred;
int error;
tracee = __begin_current_label_crit_section();
- tracer = aa_get_task_label(parent);
- error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE);
- aa_put_label(tracer);
+ cred = get_task_cred(parent);
+ tracer = cred_label(cred); /* ref count on cred */
+ error = aa_may_ptrace(cred, tracer, current_cred(), tracee,
+ AA_PTRACE_TRACE);
+ put_cred(cred);
__end_current_label_crit_section(tracee);
return error;
label = aa_get_newest_cred_label(cred);
if (!unconfined(label))
- error = aa_capable(label, cap, opts);
+ error = aa_capable(cred, label, cap, opts);
aa_put_label(label);
return error;
label = __begin_current_label_crit_section();
if (!unconfined(label))
- error = aa_path_perm(op, label, path, 0, mask, cond);
+ error = aa_path_perm(op, current_cred(), label, path, 0, mask,
+ cond);
__end_current_label_crit_section(label);
return error;
label = begin_current_label_crit_section();
if (!unconfined(label))
- error = aa_path_link(label, old_dentry, new_dir, new_dentry);
+ error = aa_path_link(current_cred(), label, old_dentry, new_dir,
+ new_dentry);
end_current_label_crit_section(label);
return error;
vfsuid = i_uid_into_vfsuid(idmap, d_backing_inode(old_dentry));
cond_exchange.uid = vfsuid_into_kuid(vfsuid);
- error = aa_path_perm(OP_RENAME_SRC, label, &new_path, 0,
+ error = aa_path_perm(OP_RENAME_SRC, current_cred(),
+ label, &new_path, 0,
MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
AA_MAY_SETATTR | AA_MAY_DELETE,
&cond_exchange);
if (!error)
- error = aa_path_perm(OP_RENAME_DEST, label, &old_path,
+ error = aa_path_perm(OP_RENAME_DEST, current_cred(),
+ label, &old_path,
0, MAY_WRITE | AA_MAY_SETATTR |
AA_MAY_CREATE, &cond_exchange);
}
if (!error)
- error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
+ error = aa_path_perm(OP_RENAME_SRC, current_cred(),
+ label, &old_path, 0,
MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
AA_MAY_SETATTR | AA_MAY_DELETE,
&cond);
if (!error)
- error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
+ error = aa_path_perm(OP_RENAME_DEST, current_cred(),
+ label, &new_path,
0, MAY_WRITE | AA_MAY_SETATTR |
AA_MAY_CREATE, &cond);
vfsuid = i_uid_into_vfsuid(idmap, inode);
cond.uid = vfsuid_into_kuid(vfsuid);
- error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
+ error = aa_path_perm(OP_OPEN, file->f_cred,
+ label, &file->f_path, 0,
aa_map_file_to_perms(file), &cond);
/* todo cache full allowed permissions set and state */
fctx->allow = aa_map_file_to_perms(file);
return -EACCES;
label = __begin_current_label_crit_section();
- error = aa_file_perm(op, label, file, mask, in_atomic);
+ error = aa_file_perm(op, current_cred(), label, file, mask, in_atomic);
__end_current_label_crit_section(label);
return error;
false);
}
+#ifdef CONFIG_IO_URING
+static const char *audit_uring_mask(u32 mask)
+{
+ if (mask & AA_MAY_CREATE_SQPOLL)
+ return "sqpoll";
+ if (mask & AA_MAY_OVERRIDE_CRED)
+ return "override_creds";
+ return "";
+}
+
+static void audit_uring_cb(struct audit_buffer *ab, void *va)
+{
+ struct apparmor_audit_data *ad = aad_of_va(va);
+
+ if (ad->request & AA_URING_PERM_MASK) {
+ audit_log_format(ab, " requested=\"%s\"",
+ audit_uring_mask(ad->request));
+ if (ad->denied & AA_URING_PERM_MASK) {
+ audit_log_format(ab, " denied=\"%s\"",
+ audit_uring_mask(ad->denied));
+ }
+ }
+ if (ad->uring.target) {
+ audit_log_format(ab, " tcontext=");
+ aa_label_xaudit(ab, labels_ns(ad->subj_label),
+ ad->uring.target,
+ FLAGS_NONE, GFP_ATOMIC);
+ }
+}
+
+static int profile_uring(struct aa_profile *profile, u32 request,
+ struct aa_label *new, int cap,
+ struct apparmor_audit_data *ad)
+{
+ unsigned int state;
+ struct aa_ruleset *rules;
+ int error = 0;
+
+ AA_BUG(!profile);
+
+ rules = list_first_entry(&profile->rules, typeof(*rules), list);
+ state = RULE_MEDIATES(rules, AA_CLASS_IO_URING);
+ if (state) {
+ struct aa_perms perms = { };
+
+ if (new) {
+ aa_label_match(profile, rules, new, state,
+ false, request, &perms);
+ } else {
+ perms = *aa_lookup_perms(rules->policy, state);
+ }
+ aa_apply_modes_to_perms(profile, &perms);
+ error = aa_check_perms(profile, &perms, request, ad,
+ audit_uring_cb);
+ }
+
+ return error;
+}
+
+/**
+ * apparmor_uring_override_creds - check the requested cred override
+ * @new: the target creds
+ *
+ * Check to see if the current task is allowed to override it's credentials
+ * to service an io_uring operation.
+ */
+static int apparmor_uring_override_creds(const struct cred *new)
+{
+ struct aa_profile *profile;
+ struct aa_label *label;
+ int error;
+ DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_IO_URING,
+ OP_URING_OVERRIDE);
+
+ ad.uring.target = cred_label(new);
+ label = __begin_current_label_crit_section();
+ error = fn_for_each(label, profile,
+ profile_uring(profile, AA_MAY_OVERRIDE_CRED,
+ cred_label(new), CAP_SYS_ADMIN, &ad));
+ __end_current_label_crit_section(label);
+
+ return error;
+}
+
+/**
+ * apparmor_uring_sqpoll - check if a io_uring polling thread can be created
+ *
+ * Check to see if the current task is allowed to create a new io_uring
+ * kernel polling thread.
+ */
+static int apparmor_uring_sqpoll(void)
+{
+ struct aa_profile *profile;
+ struct aa_label *label;
+ int error;
+ DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_IO_URING,
+ OP_URING_SQPOLL);
+
+ label = __begin_current_label_crit_section();
+ error = fn_for_each(label, profile,
+ profile_uring(profile, AA_MAY_CREATE_SQPOLL,
+ NULL, CAP_SYS_ADMIN, &ad));
+ __end_current_label_crit_section(label);
+
+ return error;
+}
+#endif /* CONFIG_IO_URING */
+
static int apparmor_sb_mount(const char *dev_name, const struct path *path,
const char *type, unsigned long flags, void *data)
{
label = __begin_current_label_crit_section();
if (!unconfined(label)) {
if (flags & MS_REMOUNT)
- error = aa_remount(label, path, flags, data);
+ error = aa_remount(current_cred(), label, path, flags,
+ data);
else if (flags & MS_BIND)
- error = aa_bind_mount(label, path, dev_name, flags);
+ error = aa_bind_mount(current_cred(), label, path,
+ dev_name, flags);
else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
MS_UNBINDABLE))
- error = aa_mount_change_type(label, path, flags);
+ error = aa_mount_change_type(current_cred(), label,
+ path, flags);
else if (flags & MS_MOVE)
- error = aa_move_mount(label, path, dev_name);
+ error = aa_move_mount_old(current_cred(), label, path,
+ dev_name);
else
- error = aa_new_mount(label, dev_name, path, type,
- flags, data);
+ error = aa_new_mount(current_cred(), label, dev_name,
+ path, type, flags, data);
}
__end_current_label_crit_section(label);
return error;
}
+static int apparmor_move_mount(const struct path *from_path,
+ const struct path *to_path)
+{
+ struct aa_label *label;
+ int error = 0;
+
+ label = __begin_current_label_crit_section();
+ if (!unconfined(label))
+ error = aa_move_mount(current_cred(), label, from_path,
+ to_path);
+ __end_current_label_crit_section(label);
+
+ return error;
+}
+
static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
{
struct aa_label *label;
label = __begin_current_label_crit_section();
if (!unconfined(label))
- error = aa_umount(label, mnt, flags);
+ error = aa_umount(current_cred(), label, mnt, flags);
__end_current_label_crit_section(label);
return error;
label = aa_get_current_label();
if (!unconfined(label))
- error = aa_pivotroot(label, old_path, new_path);
+ error = aa_pivotroot(current_cred(), label, old_path, new_path);
aa_put_label(label);
return error;
char *command, *largs = NULL, *args = value;
size_t arg_size;
int error;
- DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, AA_CLASS_NONE,
+ DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_NONE,
OP_SETPROCATTR);
if (size == 0)
return error;
fail:
- aad(&sa)->label = begin_current_label_crit_section();
- aad(&sa)->info = name;
- aad(&sa)->error = error = -EINVAL;
- aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
- end_current_label_crit_section(aad(&sa)->label);
+ ad.subj_label = begin_current_label_crit_section();
+ ad.info = name;
+ ad.error = error = -EINVAL;
+ aa_audit_msg(AUDIT_APPARMOR_DENIED, &ad, NULL);
+ end_current_label_crit_section(ad.subj_label);
goto out;
}
static void apparmor_current_getsecid_subj(u32 *secid)
{
- struct aa_label *label = aa_get_current_label();
+ struct aa_label *label = __begin_current_label_crit_section();
*secid = label->secid;
- aa_put_label(label);
+ __end_current_label_crit_section(label);
}
static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid)
int error = 0;
if (!unconfined(label))
- error = aa_task_setrlimit(label, task, resource, new_rlim);
+ error = aa_task_setrlimit(current_cred(), label, task,
+ resource, new_rlim);
__end_current_label_crit_section(label);
return error;
static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info,
int sig, const struct cred *cred)
{
+ const struct cred *tc;
struct aa_label *cl, *tl;
int error;
+ tc = get_task_cred(target);
+ tl = aa_get_newest_cred_label(tc);
if (cred) {
/*
* Dealing with USB IO specific behavior
*/
cl = aa_get_newest_cred_label(cred);
- tl = aa_get_task_label(target);
- error = aa_may_signal(cl, tl, sig);
+ error = aa_may_signal(cred, cl, tc, tl, sig);
aa_put_label(cl);
- aa_put_label(tl);
return error;
+ } else {
+ cl = __begin_current_label_crit_section();
+ error = aa_may_signal(current_cred(), cl, tc, tl, sig);
+ __end_current_label_crit_section(cl);
}
-
- cl = __begin_current_label_crit_section();
- tl = aa_get_task_label(target);
- error = aa_may_signal(cl, tl, sig);
aa_put_label(tl);
- __end_current_label_crit_section(cl);
+ put_cred(tc);
+
+ return error;
+}
+
+static int apparmor_userns_create(const struct cred *cred)
+{
+ struct aa_label *label;
+ struct aa_profile *profile;
+ int error = 0;
+ DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_TASK, AA_CLASS_NS,
+ OP_USERNS_CREATE);
+
+ ad.subj_cred = current_cred();
+
+ label = begin_current_label_crit_section();
+ if (!unconfined(label)) {
+ error = fn_for_each(label, profile,
+ aa_profile_ns_perm(profile, &ad,
+ AA_USERNS_CREATE));
+ }
+ end_current_label_crit_section(label);
return error;
}
if (!ctx)
return -ENOMEM;
- SK_CTX(sk) = ctx;
+ sk->sk_security = ctx;
return 0;
}
*/
static void apparmor_sk_free_security(struct sock *sk)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
- SK_CTX(sk) = NULL;
+ sk->sk_security = NULL;
aa_put_label(ctx->label);
aa_put_label(ctx->peer);
kfree(ctx);
static void apparmor_sk_clone_security(const struct sock *sk,
struct sock *newsk)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
- struct aa_sk_ctx *new = SK_CTX(newsk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
+ struct aa_sk_ctx *new = aa_sock(newsk);
if (new->label)
aa_put_label(new->label);
if (!(kern || unconfined(label)))
error = af_select(family,
create_perm(label, family, type, protocol),
- aa_af_perm(label, OP_CREATE, AA_MAY_CREATE,
+ aa_af_perm(current_cred(), label,
+ OP_CREATE, AA_MAY_CREATE,
family, type, protocol));
end_current_label_crit_section(label);
label = aa_get_current_label();
if (sock->sk) {
- struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
+ struct aa_sk_ctx *ctx = aa_sock(sock->sk);
aa_put_label(ctx->label);
ctx->label = aa_get_label(label);
*/
static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
if (!skb->secmark)
return 0;
static struct aa_label *sk_peer_label(struct sock *sk)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
if (ctx->peer)
return ctx->peer;
*/
static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
if (!ctx->label)
ctx->label = aa_get_current_label();
static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
struct request_sock *req)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
if (!skb->secmark)
return 0;
LSM_HOOK_INIT(capget, apparmor_capget),
LSM_HOOK_INIT(capable, apparmor_capable),
+ LSM_HOOK_INIT(move_mount, apparmor_move_mount),
LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj),
LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
LSM_HOOK_INIT(task_kill, apparmor_task_kill),
+ LSM_HOOK_INIT(userns_create, apparmor_userns_create),
#ifdef CONFIG_AUDIT
LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
+
+#ifdef CONFIG_IO_URING
+ LSM_HOOK_INIT(uring_override_creds, apparmor_uring_override_creds),
+ LSM_HOOK_INIT(uring_sqpoll, apparmor_uring_sqpoll),
+#endif
};
/*
char *aa_get_buffer(bool in_atomic)
{
union aa_buffer *aa_buf;
+ struct aa_local_cache *cache;
bool try_again = true;
gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
+ /* use per cpu cached buffers first */
+ cache = get_cpu_ptr(&aa_local_buffers);
+ if (!list_empty(&cache->head)) {
+ aa_buf = list_first_entry(&cache->head, union aa_buffer, list);
+ list_del(&aa_buf->list);
+ cache->hold--;
+ cache->count--;
+ put_cpu_ptr(&aa_local_buffers);
+ return &aa_buf->buffer[0];
+ }
+ put_cpu_ptr(&aa_local_buffers);
+
+ if (!spin_trylock(&aa_buffers_lock)) {
+ cache = get_cpu_ptr(&aa_local_buffers);
+ cache->hold += 1;
+ put_cpu_ptr(&aa_local_buffers);
+ spin_lock(&aa_buffers_lock);
+ } else {
+ cache = get_cpu_ptr(&aa_local_buffers);
+ put_cpu_ptr(&aa_local_buffers);
+ }
retry:
- spin_lock(&aa_buffers_lock);
if (buffer_count > reserve_count ||
(in_atomic && !list_empty(&aa_global_buffers))) {
aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
if (!aa_buf) {
if (try_again) {
try_again = false;
+ spin_lock(&aa_buffers_lock);
goto retry;
}
pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n");
void aa_put_buffer(char *buf)
{
union aa_buffer *aa_buf;
+ struct aa_local_cache *cache;
if (!buf)
return;
aa_buf = container_of(buf, union aa_buffer, buffer[0]);
- spin_lock(&aa_buffers_lock);
- list_add(&aa_buf->list, &aa_global_buffers);
- buffer_count++;
- spin_unlock(&aa_buffers_lock);
+ cache = get_cpu_ptr(&aa_local_buffers);
+ if (!cache->hold) {
+ put_cpu_ptr(&aa_local_buffers);
+
+ if (spin_trylock(&aa_buffers_lock)) {
+ /* put back on global list */
+ list_add(&aa_buf->list, &aa_global_buffers);
+ buffer_count++;
+ spin_unlock(&aa_buffers_lock);
+ cache = get_cpu_ptr(&aa_local_buffers);
+ put_cpu_ptr(&aa_local_buffers);
+ return;
+ }
+ /* contention on global list, fallback to percpu */
+ cache = get_cpu_ptr(&aa_local_buffers);
+ cache->hold += 1;
+ }
+
+ /* cache in percpu list */
+ list_add(&aa_buf->list, &cache->head);
+ cache->count++;
+ put_cpu_ptr(&aa_local_buffers);
}
/*
union aa_buffer *aa_buf;
int i, num;
+ /*
+ * per cpu set of cached allocated buffers used to help reduce
+ * lock contention
+ */
+ for_each_possible_cpu(i) {
+ per_cpu(aa_local_buffers, i).hold = 0;
+ per_cpu(aa_local_buffers, i).count = 0;
+ INIT_LIST_HEAD(&per_cpu(aa_local_buffers, i).head);
+ }
/*
* A function may require two buffers at once. Usually the buffers are
* used for a short period of time and are shared. On UP kernel buffers
}
static struct ctl_table apparmor_sysctl_table[] = {
+#ifdef CONFIG_USER_NS
{
.procname = "unprivileged_userns_apparmor_policy",
.data = &unprivileged_userns_apparmor_policy,
.mode = 0600,
.proc_handler = apparmor_dointvec,
},
+#endif /* CONFIG_USER_NS */
{
.procname = "apparmor_display_secid_mode",
.data = &apparmor_display_secid_mode,
.mode = 0600,
.proc_handler = apparmor_dointvec,
},
-
+ {
+ .procname = "apparmor_restrict_unprivileged_unconfined",
+ .data = &aa_unprivileged_unconfined_restricted,
+ .maxlen = sizeof(int),
+ .mode = 0600,
+ .proc_handler = apparmor_dointvec,
+ },
{ }
};
if (sk == NULL)
return NF_ACCEPT;
- ctx = SK_CTX(sk);
+ ctx = aa_sock(sk);
if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
skb->secmark, sk))
return NF_ACCEPT;
__initcall(apparmor_nf_ip_init);
#endif
+static char nulldfa_src[] = {
+ #include "nulldfa.in"
+};
+struct aa_dfa *nulldfa;
+
+static char stacksplitdfa_src[] = {
+ #include "stacksplitdfa.in"
+};
+struct aa_dfa *stacksplitdfa;
+struct aa_policydb *nullpdb;
+
+static int __init aa_setup_dfa_engine(void)
+{
+ int error = -ENOMEM;
+
+ nullpdb = aa_alloc_pdb(GFP_KERNEL);
+ if (!nullpdb)
+ return -ENOMEM;
+
+ nulldfa = aa_dfa_unpack(nulldfa_src, sizeof(nulldfa_src),
+ TO_ACCEPT1_FLAG(YYTD_DATA32) |
+ TO_ACCEPT2_FLAG(YYTD_DATA32));
+ if (IS_ERR(nulldfa)) {
+ error = PTR_ERR(nulldfa);
+ goto fail;
+ }
+ nullpdb->dfa = aa_get_dfa(nulldfa);
+ nullpdb->perms = kcalloc(2, sizeof(struct aa_perms), GFP_KERNEL);
+ if (!nullpdb->perms)
+ goto fail;
+ nullpdb->size = 2;
+
+ stacksplitdfa = aa_dfa_unpack(stacksplitdfa_src,
+ sizeof(stacksplitdfa_src),
+ TO_ACCEPT1_FLAG(YYTD_DATA32) |
+ TO_ACCEPT2_FLAG(YYTD_DATA32));
+ if (IS_ERR(stacksplitdfa)) {
+ error = PTR_ERR(stacksplitdfa);
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ aa_put_pdb(nullpdb);
+ aa_put_dfa(nulldfa);
+ nullpdb = NULL;
+ nulldfa = NULL;
+ stacksplitdfa = NULL;
+
+ return error;
+}
+
+static void __init aa_teardown_dfa_engine(void)
+{
+ aa_put_dfa(stacksplitdfa);
+ aa_put_dfa(nulldfa);
+ aa_put_pdb(nullpdb);
+ nullpdb = NULL;
+ stacksplitdfa = NULL;
+ nulldfa = NULL;
+}
+
static int __init apparmor_init(void)
{
int error;
projects / linux-2.6-microblaze.git / blobdiff