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-rw-r--r--security/smack/smack.h14
-rw-r--r--security/smack/smack_access.c9
-rw-r--r--security/smack/smack_lsm.c25
-rw-r--r--security/smack/smackfs.c53
4 files changed, 51 insertions, 50 deletions
diff --git a/security/smack/smack.h b/security/smack/smack.h
index cc361b8f3d13..99b36124f712 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -43,7 +43,6 @@ struct superblock_smack {
char *smk_hat;
char *smk_default;
int smk_initialized;
- spinlock_t smk_sblock; /* for initialization */
};
struct socket_smack {
@@ -284,6 +283,19 @@ static inline char *smk_of_current(void)
}
/*
+ * Is the task privileged and allowed to be privileged
+ * by the onlycap rule.
+ */
+static inline int smack_privileged(int cap)
+{
+ if (!capable(cap))
+ return 0;
+ if (smack_onlycap == NULL || smack_onlycap == smk_of_current())
+ return 1;
+ return 0;
+}
+
+/*
* logging functions
*/
#define SMACK_AUDIT_DENIED 0x1
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 9f3705e92712..db14689a21e0 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -220,14 +220,9 @@ int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
}
/*
- * Return if a specific label has been designated as the
- * only one that gets privilege and current does not
- * have that label.
+ * Allow for priviliged to override policy.
*/
- if (smack_onlycap != NULL && smack_onlycap != sp)
- goto out_audit;
-
- if (capable(CAP_MAC_OVERRIDE))
+ if (rc != 0 && smack_privileged(CAP_MAC_OVERRIDE))
rc = 0;
out_audit:
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index ee0bb5735f35..8221514cc997 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -217,7 +217,7 @@ static int smack_syslog(int typefrom_file)
int rc = 0;
char *sp = smk_of_current();
- if (capable(CAP_MAC_OVERRIDE))
+ if (smack_privileged(CAP_MAC_OVERRIDE))
return 0;
if (sp != smack_known_floor.smk_known)
@@ -251,7 +251,6 @@ static int smack_sb_alloc_security(struct super_block *sb)
sbsp->smk_floor = smack_known_floor.smk_known;
sbsp->smk_hat = smack_known_hat.smk_known;
sbsp->smk_initialized = 0;
- spin_lock_init(&sbsp->smk_sblock);
sb->s_security = sbsp;
@@ -332,13 +331,10 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
char *commap;
char *nsp;
- spin_lock(&sp->smk_sblock);
- if (sp->smk_initialized != 0) {
- spin_unlock(&sp->smk_sblock);
+ if (sp->smk_initialized != 0)
return 0;
- }
+
sp->smk_initialized = 1;
- spin_unlock(&sp->smk_sblock);
for (op = data; op != NULL; op = commap) {
commap = strchr(op, ',');
@@ -825,7 +821,7 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
rc = -EPERM;
/*
* check label validity here so import wont fail on
@@ -835,7 +831,7 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
smk_import(value, size) == NULL)
rc = -EINVAL;
} else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
rc = -EPERM;
if (size != TRANS_TRUE_SIZE ||
strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
@@ -931,7 +927,7 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
strcmp(name, XATTR_NAME_SMACKMMAP)) {
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
rc = -EPERM;
} else
rc = cap_inode_removexattr(dentry, name);
@@ -1720,7 +1716,8 @@ static int smack_task_wait(struct task_struct *p)
* state into account in the decision as well as
* the smack value.
*/
- if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE))
+ if (smack_privileged(CAP_MAC_OVERRIDE) ||
+ has_capability(p, CAP_MAC_OVERRIDE))
rc = 0;
/* we log only if we didn't get overriden */
out_log:
@@ -2721,7 +2718,7 @@ static int smack_setprocattr(struct task_struct *p, char *name,
if (p != current)
return -EPERM;
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
@@ -2784,7 +2781,7 @@ static int smack_unix_stream_connect(struct sock *sock,
smk_ad_setfield_u_net_sk(&ad, other);
#endif
- if (!capable(CAP_MAC_OVERRIDE))
+ if (!smack_privileged(CAP_MAC_OVERRIDE))
rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
/*
@@ -2820,7 +2817,7 @@ static int smack_unix_may_send(struct socket *sock, struct socket *other)
smk_ad_setfield_u_net_sk(&ad, other->sk);
#endif
- if (!capable(CAP_MAC_OVERRIDE))
+ if (!smack_privileged(CAP_MAC_OVERRIDE))
rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
return rc;
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 1810c9a4ed48..d31e6d957c21 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -215,28 +215,27 @@ static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
* @access: access string
* @rule: Smack rule
* @import: if non-zero, import labels
+ * @len: label length limit
*
* Returns 0 on success, -1 on failure
*/
static int smk_fill_rule(const char *subject, const char *object,
const char *access, struct smack_rule *rule,
- int import)
+ int import, int len)
{
- int rc = -1;
- int done;
const char *cp;
struct smack_known *skp;
if (import) {
- rule->smk_subject = smk_import(subject, 0);
+ rule->smk_subject = smk_import(subject, len);
if (rule->smk_subject == NULL)
return -1;
- rule->smk_object = smk_import(object, 0);
+ rule->smk_object = smk_import(object, len);
if (rule->smk_object == NULL)
return -1;
} else {
- cp = smk_parse_smack(subject, 0);
+ cp = smk_parse_smack(subject, len);
if (cp == NULL)
return -1;
skp = smk_find_entry(cp);
@@ -245,7 +244,7 @@ static int smk_fill_rule(const char *subject, const char *object,
return -1;
rule->smk_subject = skp->smk_known;
- cp = smk_parse_smack(object, 0);
+ cp = smk_parse_smack(object, len);
if (cp == NULL)
return -1;
skp = smk_find_entry(cp);
@@ -257,7 +256,7 @@ static int smk_fill_rule(const char *subject, const char *object,
rule->smk_access = 0;
- for (cp = access, done = 0; *cp && !done; cp++) {
+ for (cp = access; *cp != '\0'; cp++) {
switch (*cp) {
case '-':
break;
@@ -282,13 +281,11 @@ static int smk_fill_rule(const char *subject, const char *object,
rule->smk_access |= MAY_TRANSMUTE;
break;
default:
- done = 1;
- break;
+ return 0;
}
}
- rc = 0;
- return rc;
+ return 0;
}
/**
@@ -304,7 +301,8 @@ static int smk_parse_rule(const char *data, struct smack_rule *rule, int import)
int rc;
rc = smk_fill_rule(data, data + SMK_LABELLEN,
- data + SMK_LABELLEN + SMK_LABELLEN, rule, import);
+ data + SMK_LABELLEN + SMK_LABELLEN, rule, import,
+ SMK_LABELLEN);
return rc;
}
@@ -340,7 +338,7 @@ static int smk_parse_long_rule(const char *data, struct smack_rule *rule,
goto free_out_o;
if (sscanf(data, "%s %s %s", subject, object, access) == 3)
- rc = smk_fill_rule(subject, object, access, rule, import);
+ rc = smk_fill_rule(subject, object, access, rule, import, 0);
kfree(access);
free_out_o:
@@ -520,6 +518,9 @@ static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
if (strlen(srp->smk_subject) >= max || strlen(srp->smk_object) >= max)
return;
+ if (srp->smk_access == 0)
+ return;
+
seq_printf(s, "%s %s", srp->smk_subject, srp->smk_object);
seq_putc(s, ' ');
@@ -534,8 +535,6 @@ static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
seq_putc(s, 'a');
if (srp->smk_access & MAY_TRANSMUTE)
seq_putc(s, 't');
- if (srp->smk_access == 0)
- seq_putc(s, '-');
seq_putc(s, '\n');
}
@@ -595,13 +594,12 @@ static int smk_open_load(struct inode *inode, struct file *file)
static ssize_t smk_write_load(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
-
/*
* Must have privilege.
* No partial writes.
* Enough data must be present.
*/
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
@@ -787,7 +785,7 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
* No partial writes.
* Enough data must be present.
*/
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
if (*ppos != 0)
return -EINVAL;
@@ -1090,7 +1088,7 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
* "<addr/mask, as a.b.c.d/e><space><label>"
* "<addr, as a.b.c.d><space><label>"
*/
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
if (*ppos != 0)
return -EINVAL;
@@ -1267,7 +1265,7 @@ static ssize_t smk_write_doi(struct file *file, const char __user *buf,
char temp[80];
int i;
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
if (count >= sizeof(temp) || count == 0)
@@ -1334,7 +1332,7 @@ static ssize_t smk_write_direct(struct file *file, const char __user *buf,
char temp[80];
int i;
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
if (count >= sizeof(temp) || count == 0)
@@ -1412,7 +1410,7 @@ static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
char temp[80];
int i;
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
if (count >= sizeof(temp) || count == 0)
@@ -1503,7 +1501,7 @@ static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
char *data;
int rc = count;
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
data = kzalloc(count + 1, GFP_KERNEL);
@@ -1586,7 +1584,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
char *sp = smk_of_task(current->cred->security);
int rc = count;
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
/*
@@ -1664,7 +1662,7 @@ static ssize_t smk_write_logging(struct file *file, const char __user *buf,
char temp[32];
int i;
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
if (count >= sizeof(temp) || count == 0)
@@ -1885,7 +1883,7 @@ static ssize_t smk_write_load2(struct file *file, const char __user *buf,
/*
* Must have privilege.
*/
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
@@ -2051,7 +2049,6 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
}
root_inode = sb->s_root->d_inode;
- root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.