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Message-ID: <CAHRSSEzJMTiZ0prsbEz6=ROSdf8hUo4FfJ0u0xrnK=Xp3vGWSg@mail.gmail.com>
Date: Thu, 19 Sep 2024 06:12:18 +0200
From: Todd Kjos <tkjos@...gle.com>
To: Casey Schaufler <casey@...aufler-ca.com>
Cc: paul@...l-moore.com, linux-security-module@...r.kernel.org,
jmorris@...ei.org, serge@...lyn.com, keescook@...omium.org,
john.johansen@...onical.com, penguin-kernel@...ove.sakura.ne.jp,
stephen.smalley.work@...il.com, linux-kernel@...r.kernel.org,
selinux@...r.kernel.org, mic@...ikod.net, netdev@...r.kernel.org,
audit@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 1/5] LSM: Replace context+len with lsm_context
On Wed, Sep 18, 2024 at 1:52 AM Casey Schaufler <casey@...aufler-ca.com> wrote:
>
> 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@...aufler-ca.com>
> Cc: netdev@...r.kernel.org
> Cc: audit@...r.kernel.org
> Cc: netfilter-devel@...r.kernel.org
> Cc: Todd Kjos <tkjos@...gle.com>
Reviewed-by: Todd Kjos <tkjos@...gle.com>
> ---
> 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 b32416f8f9cd..59081edb3370 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -3289,9 +3289,8 @@ 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 418611f21831..95c7640919ba 100644
> --- a/include/linux/lsm_hook_defs.h
> +++ b/include/linux/lsm_hook_defs.h
> @@ -292,10 +292,9 @@ 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 432bd4763703..2604ea16cd6d 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -569,8 +569,8 @@ 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);
> @@ -1530,14 +1530,13 @@ 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 32a9864c648b..5ae0b26e5d92 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 f2fed7a37e22..268117628a2c 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 e02e088b8794..5a93804e5cdb 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;
> @@ -669,8 +669,8 @@ 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 aaf54900de3c..e43767c35930 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;
> @@ -559,8 +559,7 @@ 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;
>
> @@ -635,8 +634,8 @@ 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);
> }
>
> @@ -775,7 +774,7 @@ 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)
> @@ -803,10 +802,8 @@ 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:
> @@ -814,10 +811,8 @@ 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 4f73cc52ad5d..58f5fe1eb6c0 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -4190,40 +4190,36 @@ 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 2b027c08168f..01e44a14d3d4 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -6616,15 +6616,28 @@ 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 e5b47342c274..e85efe894ac3 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -4836,22 +4836,35 @@ 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);
> }
>
> /**
> @@ -4862,15 +4875,10 @@ 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
>
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