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Smack: Remove unnecessary smack_known_invalid

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The invalid Smack label ("") and the Huh ("?") Smack label
serve the same purpose and having both is unnecessary.
While pulling out the invalid label it became clear that
the use of smack_from_secid() was inconsistent, so that
is repaired. The setting of inode labels to the invalid
label could never happen in a functional system, has
never been observed in the wild and is not what you'd
really want for a failure behavior in any case. That is
removed.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
This commit is contained in:
Casey Schaufler 2016-11-14 09:38:15 -08:00
parent 8c15d66e42
commit 152f91d4d1
4 changed files with 4 additions and 36 deletions
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1
security/smack/smack.h
View File

@ -336,7 +336,6 @@ extern int smack_ptrace_rule;
extern struct smack_known smack_known_floor;
extern struct smack_known smack_known_hat;
extern struct smack_known smack_known_huh;
extern struct smack_known smack_known_invalid;
extern struct smack_known smack_known_star;
extern struct smack_known smack_known_web;

7
security/smack/smack_access.c
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@ -36,11 +36,6 @@ struct smack_known smack_known_floor = {
.smk_secid = 5,
};
struct smack_known smack_known_invalid = {
.smk_known = "",
.smk_secid = 6,
};
struct smack_known smack_known_web = {
.smk_known = "@",
.smk_secid = 7,
@ -615,7 +610,7 @@ struct smack_known *smack_from_secid(const u32 secid)
* of a secid that is not on the list.
*/
rcu_read_unlock();
return &smack_known_invalid;
return &smack_known_huh;
}
/*

29
security/smack/smack_lsm.c
View File

@ -1384,20 +1384,14 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
skp = smk_import_entry(value, size);
if (!IS_ERR(skp))
isp->smk_inode = skp;
else
isp->smk_inode = &smack_known_invalid;
} else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
skp = smk_import_entry(value, size);
if (!IS_ERR(skp))
isp->smk_task = skp;
else
isp->smk_task = &smack_known_invalid;
} else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
skp = smk_import_entry(value, size);
if (!IS_ERR(skp))
isp->smk_mmap = skp;
else
isp->smk_mmap = &smack_known_invalid;
}
return;
@ -2068,12 +2062,8 @@ static void smack_cred_transfer(struct cred *new, const struct cred *old)
static int smack_kernel_act_as(struct cred *new, u32 secid)
{
struct task_smack *new_tsp = new->security;
struct smack_known *skp = smack_from_secid(secid);
if (skp == NULL)
return -EINVAL;
new_tsp->smk_task = skp;
new_tsp->smk_task = smack_from_secid(secid);
return 0;
}
@ -3894,21 +3884,11 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
return &smack_known_web;
return &smack_known_star;
}
if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
if ((sap->flags & NETLBL_SECATTR_SECID) != 0)
/*
* Looks like a fallback, which gives us a secid.
*/
skp = smack_from_secid(sap->attr.secid);
/*
* This has got to be a bug because it is
* impossible to specify a fallback without
* specifying the label, which will ensure
* it has a secid, and the only way to get a
* secid is from a fallback.
*/
BUG_ON(skp == NULL);
return skp;
}
return smack_from_secid(sap->attr.secid);
/*
* Without guidance regarding the smack value
* for the packet fall back on the network
@ -4771,7 +4751,6 @@ static __init void init_smack_known_list(void)
mutex_init(&smack_known_hat.smk_rules_lock);
mutex_init(&smack_known_floor.smk_rules_lock);
mutex_init(&smack_known_star.smk_rules_lock);
mutex_init(&smack_known_invalid.smk_rules_lock);
mutex_init(&smack_known_web.smk_rules_lock);
/*
* Initialize rule lists
@ -4780,7 +4759,6 @@ static __init void init_smack_known_list(void)
INIT_LIST_HEAD(&smack_known_hat.smk_rules);
INIT_LIST_HEAD(&smack_known_star.smk_rules);
INIT_LIST_HEAD(&smack_known_floor.smk_rules);
INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
INIT_LIST_HEAD(&smack_known_web.smk_rules);
/*
* Create the known labels list
@ -4789,7 +4767,6 @@ static __init void init_smack_known_list(void)
smk_insert_entry(&smack_known_hat);
smk_insert_entry(&smack_known_star);
smk_insert_entry(&smack_known_floor);
smk_insert_entry(&smack_known_invalid);
smk_insert_entry(&smack_known_web);
}

3
security/smack/smackfs.c
View File

@ -2996,9 +2996,6 @@ static int __init init_smk_fs(void)
if (err == 0 && rc < 0)
err = rc;
rc = smk_preset_netlabel(&smack_known_huh);
if (err == 0 && rc < 0)
err = rc;
rc = smk_preset_netlabel(&smack_known_invalid);
if (err == 0 && rc < 0)
err = rc;
rc = smk_preset_netlabel(&smack_known_star);