[PATCH v2 2/6] LSM: Replace context+len with lsm_context

From: Casey Schaufler
Date: Mon Oct 14 2024 - 11:19:13 EST

Replace the (secctx,seclen) pointer pair with a single
lsm_context pointer to allow return of the LSM identifier
along with the context and context length. This allows
security_release_secctx() to know how to release the
context. Callers have been modified to use or save the
returned data from the new structure.

security_secid_to_secctx() and security_lsmproc_to_secctx()
will now return the length value on success instead of 0.

Signed-off-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: audit@xxxxxxxxxxxxxxx
Cc: netfilter-devel@xxxxxxxxxxxxxxx
Cc: Todd Kjos <tkjos@xxxxxxxxxx>
---
drivers/android/binder.c | 5 ++-
include/linux/lsm_hook_defs.h | 5 ++-
include/linux/security.h | 9 +++---
include/net/scm.h | 5 ++-
kernel/audit.c | 9 +++---
kernel/auditsc.c | 16 ++++------
net/ipv4/ip_sockglue.c | 4 +--
net/netfilter/nf_conntrack_netlink.c | 8 ++---
net/netfilter/nf_conntrack_standalone.c | 4 +--
net/netfilter/nfnetlink_queue.c | 27 +++++++---------
net/netlabel/netlabel_unlabeled.c | 13 +++-----
net/netlabel/netlabel_user.c | 3 +-
security/apparmor/include/secid.h | 5 ++-
security/apparmor/secid.c | 26 +++++++--------
security/security.c | 34 +++++++++-----------
security/selinux/hooks.c | 23 +++++++++++---
security/smack/smack_lsm.c | 42 +++++++++++++++----------
17 files changed, 118 insertions(+), 120 deletions(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index d4229bf6f789..5cec5b52bd4a 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3290,9 +3290,8 @@ static void binder_transaction(struct binder_proc *proc,
size_t added_size;

security_cred_getsecid(proc->cred, &secid);
- ret = security_secid_to_secctx(secid, &lsmctx.context,
- &lsmctx.len);
- if (ret) {
+ ret = security_secid_to_secctx(secid, &lsmctx);
+ if (ret < 0) {
binder_txn_error("%d:%d failed to get security context\n",
thread->pid, proc->pid);
return_error = BR_FAILED_REPLY;
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index c13df23132eb..01e5a8e09bba 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -295,10 +295,9 @@ LSM_HOOK(int, -EINVAL, getprocattr, struct task_struct *p, const char *name,
char **value)
LSM_HOOK(int, -EINVAL, setprocattr, const char *name, void *value, size_t size)
LSM_HOOK(int, 0, ismaclabel, const char *name)
-LSM_HOOK(int, -EOPNOTSUPP, secid_to_secctx, u32 secid, char **secdata,
- u32 *seclen)
+LSM_HOOK(int, -EOPNOTSUPP, secid_to_secctx, u32 secid, struct lsm_context *cp)
LSM_HOOK(int, -EOPNOTSUPP, lsmprop_to_secctx, struct lsm_prop *prop,
- char **secdata, u32 *seclen)
+ struct lsm_context *cp)
LSM_HOOK(int, 0, secctx_to_secid, const char *secdata, u32 seclen, u32 *secid)
LSM_HOOK(void, LSM_RET_VOID, release_secctx, struct lsm_context *cp)
LSM_HOOK(void, LSM_RET_VOID, inode_invalidate_secctx, struct inode *inode)
diff --git a/include/linux/security.h b/include/linux/security.h
index 1a3ca02224e8..64e8b18e6ea5 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -584,8 +584,8 @@ int security_getprocattr(struct task_struct *p, int lsmid, const char *name,
int security_setprocattr(int lsmid, const char *name, void *value, size_t size);
int security_netlink_send(struct sock *sk, struct sk_buff *skb);
int security_ismaclabel(const char *name);
-int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);
-int security_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata, u32 *seclen);
+int security_secid_to_secctx(u32 secid, struct lsm_context *cp);
+int security_lsmprop_to_secctx(struct lsm_prop *prop, struct lsm_context *cp);
int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid);
void security_release_secctx(struct lsm_context *cp);
void security_inode_invalidate_secctx(struct inode *inode);
@@ -1557,14 +1557,13 @@ static inline int security_ismaclabel(const char *name)
return 0;
}

-static inline int security_secid_to_secctx(u32 secid, char **secdata,
- u32 *seclen)
+static inline int security_secid_to_secctx(u32 secid, struct lsm_context *cp)
{
return -EOPNOTSUPP;
}

static inline int security_lsmprop_to_secctx(struct lsm_prop *prop,
- char **secdata, u32 *seclen)
+ struct lsm_context *cp)
{
return -EOPNOTSUPP;
}
diff --git a/include/net/scm.h b/include/net/scm.h
index f75449e1d876..22bb49589fde 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -109,10 +109,9 @@ static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc
int err;

if (test_bit(SOCK_PASSSEC, &sock->flags)) {
- err = security_secid_to_secctx(scm->secid, &ctx.context,
- &ctx.len);
+ err = security_secid_to_secctx(scm->secid, &ctx);

- if (!err) {
+ if (err >= 0) {
put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, ctx.len,
ctx.context);
security_release_secctx(&ctx);
diff --git a/kernel/audit.c b/kernel/audit.c
index bafd8fd2b1f3..5cdd9aeeb9bc 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1473,9 +1473,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
case AUDIT_SIGNAL_INFO:
if (lsmprop_is_set(&audit_sig_lsm)) {
err = security_lsmprop_to_secctx(&audit_sig_lsm,
- &lsmctx.context,
- &lsmctx.len);
- if (err)
+ &lsmctx);
+ if (err < 0)
return err;
}
sig_data = kmalloc(struct_size(sig_data, ctx, lsmctx.len),
@@ -2188,8 +2187,8 @@ int audit_log_task_context(struct audit_buffer *ab)
if (!lsmprop_is_set(&prop))
return 0;

- error = security_lsmprop_to_secctx(&prop, &ctx.context, &ctx.len);
- if (error) {
+ error = security_lsmprop_to_secctx(&prop, &ctx);
+ if (error < 0) {
if (error != -EINVAL)
goto error_path;
return 0;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index c196dd4c9b54..4d3c22ba7149 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1109,7 +1109,7 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
from_kuid(&init_user_ns, auid),
from_kuid(&init_user_ns, uid), sessionid);
if (lsmprop_is_set(prop)) {
- if (security_lsmprop_to_secctx(prop, &ctx.context, &ctx.len)) {
+ if (security_lsmprop_to_secctx(prop, &ctx) < 0) {
audit_log_format(ab, " obj=(none)");
rc = 1;
} else {
@@ -1370,7 +1370,6 @@ static void audit_log_time(struct audit_context *context, struct audit_buffer **

static void show_special(struct audit_context *context, int *call_panic)
{
- struct lsm_context lsmcxt;
struct audit_buffer *ab;
int i;

@@ -1393,16 +1392,14 @@ static void show_special(struct audit_context *context, int *call_panic)
from_kgid(&init_user_ns, context->ipc.gid),
context->ipc.mode);
if (lsmprop_is_set(&context->ipc.oprop)) {
- char *ctx = NULL;
- u32 len;
+ struct lsm_context lsmctx;

if (security_lsmprop_to_secctx(&context->ipc.oprop,
- &ctx, &len)) {
+ &lsmctx) < 0) {
*call_panic = 1;
} else {
- audit_log_format(ab, " obj=%s", ctx);
- lsmcontext_init(&lsmcxt, ctx, len, 0);
- security_release_secctx(&lsmcxt);
+ audit_log_format(ab, " obj=%s", lsmctx.context);
+ security_release_secctx(&lsmctx);
}
}
if (context->ipc.has_perm) {
@@ -1563,8 +1560,7 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
if (lsmprop_is_set(&n->oprop)) {
struct lsm_context ctx;

- if (security_lsmprop_to_secctx(&n->oprop, &ctx.context,
- &ctx.len)) {
+ if (security_lsmprop_to_secctx(&n->oprop, &ctx) < 0) {
if (call_panic)
*call_panic = 2;
} else {
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index a8180dcc2a32..dadbf619b20f 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -136,8 +136,8 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
if (err)
return;

- err = security_secid_to_secctx(secid, &ctx.context, &ctx.len);
- if (err)
+ err = security_secid_to_secctx(secid, &ctx);
+ if (err < 0)
return;

put_cmsg(msg, SOL_IP, SCM_SECURITY, ctx.len, ctx.context);
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 86a57a3afdd6..dd74d4c67c69 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -360,8 +360,8 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
struct lsm_context ctx;
int ret;

- ret = security_secid_to_secctx(ct->secmark, &ctx.context, &ctx.len);
- if (ret)
+ ret = security_secid_to_secctx(ct->secmark, &ctx);
+ if (ret < 0)
return 0;

ret = -1;
@@ -665,8 +665,8 @@ static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
#ifdef CONFIG_NF_CONNTRACK_SECMARK
int len, ret;

- ret = security_secid_to_secctx(ct->secmark, NULL, &len);
- if (ret)
+ ret = security_secid_to_secctx(ct->secmark, NULL);
+ if (ret < 0)
return 0;

return nla_total_size(0) /* CTA_SECCTX */
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 5f7fd23b7afe..502cf10aab41 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -175,8 +175,8 @@ static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
struct lsm_context ctx;
int ret;

- ret = security_secid_to_secctx(ct->secmark, &ctx.context, &ctx.len);
- if (ret)
+ ret = security_secid_to_secctx(ct->secmark, &ctx);
+ if (ret < 0)
return;

seq_printf(s, "secctx=%s ", ctx.context);
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index 37757cd77cf1..5110f29b2f40 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -470,18 +470,18 @@ static int nfqnl_put_sk_classid(struct sk_buff *skb, struct sock *sk)
return 0;
}

-static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
+static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, struct lsm_context *ctx)
{
u32 seclen = 0;
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
+
if (!skb || !sk_fullsock(skb->sk))
return 0;

read_lock_bh(&skb->sk->sk_callback_lock);

if (skb->secmark)
- security_secid_to_secctx(skb->secmark, secdata, &seclen);
-
+ seclen = security_secid_to_secctx(skb->secmark, ctx);
read_unlock_bh(&skb->sk->sk_callback_lock);
#endif
return seclen;
@@ -567,8 +567,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
enum ip_conntrack_info ctinfo = 0;
const struct nfnl_ct_hook *nfnl_ct;
bool csum_verify;
- struct lsm_context scaff; /* scaffolding */
- char *secdata = NULL;
+ struct lsm_context ctx;
u32 seclen = 0;
ktime_t tstamp;

@@ -643,8 +642,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
}

if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
- seclen = nfqnl_get_sk_secctx(entskb, &secdata);
- if (seclen)
+ seclen = nfqnl_get_sk_secctx(entskb, &ctx);
+ if (seclen >= 0)
size += nla_total_size(seclen);
}

@@ -783,7 +782,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
if (nfqnl_put_sk_classid(skb, entskb->sk) < 0)
goto nla_put_failure;

- if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
+ if (seclen && nla_put(skb, NFQA_SECCTX, ctx.len, ctx.context))
goto nla_put_failure;

if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
@@ -811,10 +810,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
}

nlh->nlmsg_len = skb->len;
- if (seclen) {
- lsmcontext_init(&scaff, secdata, seclen, 0);
- security_release_secctx(&scaff);
- }
+ if (seclen >= 0)
+ security_release_secctx(&ctx);
return skb;

nla_put_failure:
@@ -822,10 +819,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
kfree_skb(skb);
net_err_ratelimited("nf_queue: error creating packet message\n");
nlmsg_failure:
- if (seclen) {
- lsmcontext_init(&scaff, secdata, seclen, 0);
- security_release_secctx(&scaff);
- }
+ if (seclen >= 0)
+ security_release_secctx(&ctx);
return NULL;
}

diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 8303bbcfc543..dfda9ea61971 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -437,8 +437,7 @@ int netlbl_unlhsh_add(struct net *net,
unlhsh_add_return:
rcu_read_unlock();
if (audit_buf != NULL) {
- if (security_secid_to_secctx(secid, &ctx.context,
- &ctx.len) == 0) {
+ if (security_secid_to_secctx(secid, &ctx) >= 0) {
audit_log_format(audit_buf, " sec_obj=%s", ctx.context);
security_release_secctx(&ctx);
}
@@ -491,8 +490,7 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
addr->s_addr, mask->s_addr);
dev_put(dev);
if (entry != NULL &&
- security_secid_to_secctx(entry->secid, &ctx.context,
- &ctx.len) == 0) {
+ security_secid_to_secctx(entry->secid, &ctx) >= 0) {
audit_log_format(audit_buf, " sec_obj=%s", ctx.context);
security_release_secctx(&ctx);
}
@@ -550,8 +548,7 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
addr, mask);
dev_put(dev);
if (entry != NULL &&
- security_secid_to_secctx(entry->secid, &ctx.context,
- &ctx.len) == 0) {
+ security_secid_to_secctx(entry->secid, &ctx) >= 0) {
audit_log_format(audit_buf, " sec_obj=%s", ctx.context);
security_release_secctx(&ctx);
}
@@ -1122,8 +1119,8 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
secid = addr6->secid;
}

- ret_val = security_secid_to_secctx(secid, &ctx.context, &ctx.len);
- if (ret_val != 0)
+ ret_val = security_secid_to_secctx(secid, &ctx);
+ if (ret_val < 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_SECCTX,
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index f5e7a9919df1..0d04d23aafe7 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -98,8 +98,7 @@ struct audit_buffer *netlbl_audit_start_common(int type,
audit_info->sessionid);

if (lsmprop_is_set(&audit_info->prop) &&
- security_lsmprop_to_secctx(&audit_info->prop, &ctx.context,
- &ctx.len) == 0) {
+ security_lsmprop_to_secctx(&audit_info->prop, &ctx) > 0) {
audit_log_format(audit_buf, " subj=%s", ctx.context);
security_release_secctx(&ctx);
}
diff --git a/security/apparmor/include/secid.h b/security/apparmor/include/secid.h
index 8b92f90b6921..550a8d3ed527 100644
--- a/security/apparmor/include/secid.h
+++ b/security/apparmor/include/secid.h
@@ -25,9 +25,8 @@ struct aa_label;
extern int apparmor_display_secid_mode;

struct aa_label *aa_secid_to_label(u32 secid);
-int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);
-int apparmor_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata,
- u32 *seclen);
+int apparmor_secid_to_secctx(u32 secid, struct lsm_context *cp);
+int apparmor_lsmprop_to_secctx(struct lsm_prop *prop, struct lsm_context *cp);
int apparmor_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid);
void apparmor_release_secctx(struct lsm_context *cp);

diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c
index 8d9ced8cdffd..5d92fc3ab8b4 100644
--- a/security/apparmor/secid.c
+++ b/security/apparmor/secid.c
@@ -61,23 +61,21 @@ struct aa_label *aa_secid_to_label(u32 secid)
return xa_load(&aa_secids, secid);
}

-static int apparmor_label_to_secctx(struct aa_label *label, char **secdata,
- u32 *seclen)
+static int apparmor_label_to_secctx(struct aa_label *label,
+ struct lsm_context *cp)
{
/* TODO: cache secctx and ref count so we don't have to recreate */
int flags = FLAG_VIEW_SUBNS | FLAG_HIDDEN_UNCONFINED | FLAG_ABS_ROOT;
int len;

- AA_BUG(!seclen);
-
if (!label)
return -EINVAL;

if (apparmor_display_secid_mode)
flags |= FLAG_SHOW_MODE;

- if (secdata)
- len = aa_label_asxprint(secdata, root_ns, label,
+ if (cp)
+ len = aa_label_asxprint(&cp->context, root_ns, label,
flags, GFP_ATOMIC);
else
len = aa_label_snxprint(NULL, 0, root_ns, label, flags);
@@ -85,26 +83,28 @@ static int apparmor_label_to_secctx(struct aa_label *label, char **secdata,
if (len < 0)
return -ENOMEM;

- *seclen = len;
+ if (cp) {
+ cp->len = len;
+ cp->id = LSM_ID_APPARMOR;
+ }

- return 0;
+ return len;
}

-int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
+int apparmor_secid_to_secctx(u32 secid, struct lsm_context *cp)
{
struct aa_label *label = aa_secid_to_label(secid);

- return apparmor_label_to_secctx(label, secdata, seclen);
+ return apparmor_label_to_secctx(label, cp);
}

-int apparmor_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata,
- u32 *seclen)
+int apparmor_lsmprop_to_secctx(struct lsm_prop *prop, struct lsm_context *cp)
{
struct aa_label *label;

label = prop->apparmor.label;

- return apparmor_label_to_secctx(label, secdata, seclen);
+ return apparmor_label_to_secctx(label, cp);
}

int apparmor_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
diff --git a/security/security.c b/security/security.c
index 0c9c3a02704b..914d8c8beea7 100644
--- a/security/security.c
+++ b/security/security.c
@@ -4309,40 +4309,36 @@ EXPORT_SYMBOL(security_ismaclabel);
/**
* security_secid_to_secctx() - Convert a secid to a secctx
* @secid: secid
- * @secdata: secctx
- * @seclen: secctx length
+ * @cp: the LSM context
*
- * Convert secid to security context. If @secdata is NULL the length of the
- * result will be returned in @seclen, but no @secdata will be returned. This
+ * Convert secid to security context. If @cp is NULL the length of the
+ * result will be returned, but no data will be returned. This
* does mean that the length could change between calls to check the length and
- * the next call which actually allocates and returns the @secdata.
+ * the next call which actually allocates and returns the data.
*
- * Return: Return 0 on success, error on failure.
+ * Return: Return length of data on success, error on failure.
*/
-int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
+int security_secid_to_secctx(u32 secid, struct lsm_context *cp)
{
- return call_int_hook(secid_to_secctx, secid, secdata, seclen);
+ return call_int_hook(secid_to_secctx, secid, cp);
}
EXPORT_SYMBOL(security_secid_to_secctx);

/**
* security_lsmprop_to_secctx() - Convert a lsm_prop to a secctx
* @prop: lsm specific information
- * @secdata: secctx
- * @seclen: secctx length
+ * @cp: the LSM context
*
- * Convert a @prop entry to security context. If @secdata is NULL the
- * length of the result will be returned in @seclen, but no @secdata
- * will be returned. This does mean that the length could change between
- * calls to check the length and the next call which actually allocates
- * and returns the @secdata.
+ * Convert a @prop entry to security context. If @cp is NULL the
+ * length of the result will be returned. This does mean that the
+ * length could change between calls to check the length and the
+ * next call which actually allocates and returns the @cp.
*
- * Return: Return 0 on success, error on failure.
+ * Return: Return length of data on success, error on failure.
*/
-int security_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata,
- u32 *seclen)
+int security_lsmprop_to_secctx(struct lsm_prop *prop, struct lsm_context *cp)
{
- return call_int_hook(lsmprop_to_secctx, prop, secdata, seclen);
+ return call_int_hook(lsmprop_to_secctx, prop, cp);
}
EXPORT_SYMBOL(security_lsmprop_to_secctx);

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 1503d398c87d..692735eb04aa 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6607,15 +6607,28 @@ static int selinux_ismaclabel(const char *name)
return (strcmp(name, XATTR_SELINUX_SUFFIX) == 0);
}

-static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
+static int selinux_secid_to_secctx(u32 secid, struct lsm_context *cp)
{
- return security_sid_to_context(secid, secdata, seclen);
+ u32 seclen;
+ u32 ret;
+
+ if (cp) {
+ cp->id = LSM_ID_SELINUX;
+ ret = security_sid_to_context(secid, &cp->context, &cp->len);
+ if (ret < 0)
+ return ret;
+ return cp->len;
+ }
+ ret = security_sid_to_context(secid, NULL, &seclen);
+ if (ret < 0)
+ return ret;
+ return seclen;
}

-static int selinux_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata,
- u32 *seclen)
+static int selinux_lsmprop_to_secctx(struct lsm_prop *prop,
+ struct lsm_context *cp)
{
- return selinux_secid_to_secctx(prop->selinux.secid, secdata, seclen);
+ return selinux_secid_to_secctx(prop->selinux.secid, cp);
}

static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 0c476282e279..d52163d3dd64 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4817,22 +4817,35 @@ static int smack_ismaclabel(const char *name)
return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
}

+/**
+ * smack_to_secctx - fill a lsm_context
+ * @skp: Smack label
+ * @cp: destination
+ *
+ * Fill the passed @cp and return the length of the string
+ */
+static int smack_to_secctx(struct smack_known *skp, struct lsm_context *cp)
+{
+ int len = strlen(skp->smk_known);
+
+ if (cp) {
+ cp->context = skp->smk_known;
+ cp->len = len;
+ cp->id = LSM_ID_SMACK;
+ }
+ return len;
+}
+
/**
* smack_secid_to_secctx - return the smack label for a secid
* @secid: incoming integer
- * @secdata: destination
- * @seclen: how long it is
+ * @cp: destination
*
* Exists for networking code.
*/
-static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
+static int smack_secid_to_secctx(u32 secid, struct lsm_context *cp)
{
- struct smack_known *skp = smack_from_secid(secid);
-
- if (secdata)
- *secdata = skp->smk_known;
- *seclen = strlen(skp->smk_known);
- return 0;
+ return smack_to_secctx(smack_from_secid(secid), cp);
}

/**
@@ -4843,15 +4856,10 @@ static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
*
* Exists for audit code.
*/
-static int smack_lsmprop_to_secctx(struct lsm_prop *prop, char **secdata,
- u32 *seclen)
+static int smack_lsmprop_to_secctx(struct lsm_prop *prop,
+ struct lsm_context *cp)
{
- struct smack_known *skp = prop->smack.skp;
-
- if (secdata)
- *secdata = skp->smk_known;
- *seclen = strlen(skp->smk_known);
- return 0;
+ return smack_to_secctx(prop->smack.skp, cp);
}

/**
--
2.46.0