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Message-ID: <20240825190048.13289-14-casey@schaufler-ca.com>
Date: Sun, 25 Aug 2024 12:00:48 -0700
From: Casey Schaufler <casey@...aufler-ca.com>
To: casey@...aufler-ca.com,
paul@...l-moore.com,
linux-security-module@...r.kernel.org
Cc: 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,
mic@...ikod.net
Subject: [PATCH 13/13] LSM: Remove lsmblob scaffolding
Remove the scaffold member from the lsmblob. Remove the
remaining places it is being set.
Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
---
include/linux/security.h | 6 ------
security/apparmor/audit.c | 6 +-----
security/apparmor/lsm.c | 4 ----
security/apparmor/secid.c | 6 +-----
security/selinux/hooks.c | 18 +-----------------
security/selinux/ss/services.c | 4 ----
security/smack/smack_lsm.c | 33 ++++-----------------------------
7 files changed, 7 insertions(+), 70 deletions(-)
diff --git a/include/linux/security.h b/include/linux/security.h
index 111c1fc18f25..ca4f3b41f344 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -144,11 +144,6 @@ enum lockdown_reason {
LOCKDOWN_CONFIDENTIALITY_MAX,
};
-/* scaffolding */
-struct lsmblob_scaffold {
- u32 secid;
-};
-
/*
* Data exported by the security modules
*/
@@ -157,7 +152,6 @@ struct lsmblob {
struct lsmblob_smack smack;
struct lsmblob_apparmor apparmor;
struct lsmblob_bpf bpf;
- struct lsmblob_scaffold scaffold;
};
extern const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1];
diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c
index 758b75a9c1c5..120154a6d683 100644
--- a/security/apparmor/audit.c
+++ b/security/apparmor/audit.c
@@ -270,11 +270,7 @@ int aa_audit_rule_match(struct lsmblob *blob, u32 field, u32 op, void *vrule)
struct aa_label *label;
int found = 0;
- /* scaffolding */
- if (!blob->apparmor.label && blob->scaffold.secid)
- label = aa_secid_to_label(blob->scaffold.secid);
- else
- label = blob->apparmor.label;
+ label = blob->apparmor.label;
if (!label)
return -ENOENT;
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 877c4e809ae8..08fde302c9fe 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -987,8 +987,6 @@ static void apparmor_current_getlsmblob_subj(struct lsmblob *blob)
struct aa_label *label = __begin_current_label_crit_section();
blob->apparmor.label = label;
- /* scaffolding */
- blob->scaffold.secid = label->secid;
__end_current_label_crit_section(label);
}
@@ -998,8 +996,6 @@ static void apparmor_task_getlsmblob_obj(struct task_struct *p,
struct aa_label *label = aa_get_task_label(p);
blob->apparmor.label = label;
- /* scaffolding */
- blob->scaffold.secid = label->secid;
aa_put_label(label);
}
diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c
index 3c389e5810cd..2b48050f97a6 100644
--- a/security/apparmor/secid.c
+++ b/security/apparmor/secid.c
@@ -100,11 +100,7 @@ int apparmor_lsmblob_to_secctx(struct lsmblob *blob, char **secdata,
AA_BUG(!seclen);
- /* scaffolding */
- if (!blob->apparmor.label && blob->scaffold.secid)
- label = aa_secid_to_label(blob->scaffold.secid);
- else
- label = blob->apparmor.label;
+ label = blob->apparmor.label;
if (!label)
return -EINVAL;
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 076511c446bd..a81529c21517 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3510,8 +3510,6 @@ static void selinux_inode_getlsmblob(struct inode *inode, struct lsmblob *blob)
struct inode_security_struct *isec = inode_security_novalidate(inode);
blob->selinux.secid = isec->sid;
- /* scaffolding */
- blob->scaffold.secid = isec->sid;
}
static int selinux_inode_copy_up(struct dentry *src, struct cred **new)
@@ -4032,8 +4030,6 @@ static void selinux_cred_getsecid(const struct cred *c, u32 *secid)
static void selinux_cred_getlsmblob(const struct cred *c, struct lsmblob *blob)
{
blob->selinux.secid = cred_sid(c);
- /* scaffolding */
- blob->scaffold.secid = blob->selinux.secid;
}
/*
@@ -4174,16 +4170,12 @@ static int selinux_task_getsid(struct task_struct *p)
static void selinux_current_getlsmblob_subj(struct lsmblob *blob)
{
blob->selinux.secid = current_sid();
- /* scaffolding */
- blob->scaffold.secid = blob->selinux.secid;
}
static void selinux_task_getlsmblob_obj(struct task_struct *p,
struct lsmblob *blob)
{
blob->selinux.secid = task_sid_obj(p);
- /* scaffolding */
- blob->scaffold.secid = blob->selinux.secid;
}
static int selinux_task_setnice(struct task_struct *p, int nice)
@@ -6348,8 +6340,6 @@ static void selinux_ipc_getlsmblob(struct kern_ipc_perm *ipcp,
{
struct ipc_security_struct *isec = selinux_ipc(ipcp);
blob->selinux.secid = isec->sid;
- /* scaffolding */
- blob->scaffold.secid = isec->sid;
}
static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
@@ -6634,13 +6624,7 @@ static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
static int selinux_lsmblob_to_secctx(struct lsmblob *blob, char **secdata,
u32 *seclen)
{
- u32 secid = blob->selinux.secid;
-
- /* scaffolding */
- if (!secid)
- secid = blob->scaffold.secid;
-
- return security_sid_to_context(secid, secdata, seclen);
+ return security_sid_to_context(blob->selinux.secid, secdata, seclen);
}
static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 43eb1d46942c..002072912800 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -3660,10 +3660,6 @@ int selinux_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
goto out;
}
- /* scaffolding */
- if (!blob->selinux.secid && blob->scaffold.secid)
- blob->selinux.secid = blob->scaffold.secid;
-
ctxt = sidtab_search(policy->sidtab, blob->selinux.secid);
if (unlikely(!ctxt)) {
WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n",
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index dbcf1c65da3c..670050f739da 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1655,11 +1655,7 @@ static int smack_inode_listsecurity(struct inode *inode, char *buffer,
*/
static void smack_inode_getlsmblob(struct inode *inode, struct lsmblob *blob)
{
- struct smack_known *skp = smk_of_inode(inode);
-
- blob->smack.skp = skp;
- /* scaffolding */
- blob->scaffold.secid = skp->smk_secid;
+ blob->smack.skp = smk_of_inode(inode);
}
/*
@@ -2162,8 +2158,6 @@ static void smack_cred_getlsmblob(const struct cred *cred,
{
rcu_read_lock();
blob->smack.skp = smk_of_task(smack_cred(cred));
- /* scaffolding */
- blob->scaffold.secid = blob->smack.skp->smk_secid;
rcu_read_unlock();
}
@@ -2265,11 +2259,7 @@ static int smack_task_getsid(struct task_struct *p)
*/
static void smack_current_getlsmblob_subj(struct lsmblob *blob)
{
- struct smack_known *skp = smk_of_current();
-
- blob->smack.skp = skp;
- /* scaffolding */
- blob->scaffold.secid = skp->smk_secid;
+ blob->smack.skp = smk_of_current();
}
/**
@@ -2282,11 +2272,7 @@ static void smack_current_getlsmblob_subj(struct lsmblob *blob)
static void smack_task_getlsmblob_obj(struct task_struct *p,
struct lsmblob *blob)
{
- struct smack_known *skp = smk_of_task_struct_obj(p);
-
- blob->smack.skp = skp;
- /* scaffolding */
- blob->scaffold.secid = skp->smk_secid;
+ blob->smack.skp = smk_of_task_struct_obj(p);
}
/**
@@ -3474,11 +3460,8 @@ static void smack_ipc_getlsmblob(struct kern_ipc_perm *ipp,
struct lsmblob *blob)
{
struct smack_known **iskpp = smack_ipc(ipp);
- struct smack_known *iskp = *iskpp;
- blob->smack.skp = iskp;
- /* scaffolding */
- blob->scaffold.secid = iskp->smk_secid;
+ blob->smack.skp = *iskpp;
}
/**
@@ -4825,10 +4808,6 @@ static int smack_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
return 0;
- /* scaffolding */
- if (!skp && blob->scaffold.secid)
- skp = smack_from_secid(blob->scaffold.secid);
-
/*
* No need to do string comparisons. If a match occurs,
* both pointers will point to the same smack_known
@@ -4889,10 +4868,6 @@ static int smack_lsmblob_to_secctx(struct lsmblob *blob, char **secdata,
{
struct smack_known *skp = blob->smack.skp;
- /* scaffolding */
- if (!skp && blob->scaffold.secid)
- skp = smack_from_secid(blob->scaffold.secid);
-
if (secdata)
*secdata = skp->smk_known;
*seclen = strlen(skp->smk_known);
--
2.41.0
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