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linux-kernel: Re: [PATCH][SMACK][2.6.30] convert smack to standa

Re: [PATCH][SMACK][2.6.30] convert smack to standard linux lists

From: James Morris <jmorris_at_nospam>
Date: Wed Mar 25 2009 - 22:18:35 GMT
To: Casey Schaufler <casey@schaufler-ca.com>


On Wed, 25 Mar 2009, Casey Schaufler wrote:

> Etienne Basset wrote:
> > hello,
> >
> > the following patch (on top of 2.6.29) converts Smack lists to standard linux lists
> > Please review and consider for inclusion in 2.6.30-rc
> >
> > regards,
> > Etienne
> >
> > Signed-off-by: Etienne Basset <etienne.basset@numericable.fr>
> >
>
> Acked-by: Casey Schaufler <casey@schaufler-ca.com>
>
> My tests are passing. Thank you for doing this, it was long
> overdue.

Applied to
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next

Please make sure the 'Subject' line is correct in future.

See Documentation/SubmittingPatches section 15.

>
> > ---
> > diff --git a/security/smack/smack.h b/security/smack/smack.h
> > index b79582e..64164f8 100644
> > --- a/security/smack/smack.h
> > +++ b/security/smack/smack.h
> > @@ -18,6 +18,8 @@
> > #include <linux/security.h>
> > #include <linux/in.h>
> > #include <net/netlabel.h>
> > +#include <linux/list.h>
> > +#include <linux/rculist.h>
> >
> > /*
> > * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
> > @@ -59,17 +61,10 @@ struct inode_smack {
> > * A label access rule.
> > */
> > struct smack_rule {
> > - char *smk_subject;
> > - char *smk_object;
> > - int smk_access;
> > -};
> > -
> > -/*
> > - * An entry in the table of permitted label accesses.
> > - */
> > -struct smk_list_entry {
> > - struct smk_list_entry *smk_next;
> > - struct smack_rule smk_rule;
> > + struct list_head list;
> > + char *smk_subject;
> > + char *smk_object;
> > + int smk_access;
> > };
> >
> > /*
> > @@ -85,7 +80,7 @@ struct smack_cipso {
> > * An entry in the table identifying hosts.
> > */
> > struct smk_netlbladdr {
> > - struct smk_netlbladdr *smk_next;
> > + struct list_head list;
> > struct sockaddr_in smk_host; /* network address */
> > struct in_addr smk_mask; /* network mask */
> > char *smk_label; /* label */
> > @@ -113,7 +108,7 @@ struct smk_netlbladdr {
> > * the cipso direct mapping in used internally.
> > */
> > struct smack_known {
> > - struct smack_known *smk_next;
> > + struct list_head list;
> > char smk_known[SMK_LABELLEN];
> > u32 smk_secid;
> > struct smack_cipso *smk_cipso;
> > @@ -206,7 +201,6 @@ extern int smack_cipso_direct;
> > extern char *smack_net_ambient;
> > extern char *smack_onlycap;
> >
> > -extern struct smack_known *smack_known;
> > extern struct smack_known smack_known_floor;
> > extern struct smack_known smack_known_hat;
> > extern struct smack_known smack_known_huh;
> > @@ -214,8 +208,10 @@ extern struct smack_known smack_known_invalid;
> > extern struct smack_known smack_known_star;
> > extern struct smack_known smack_known_web;
> >
> > -extern struct smk_list_entry *smack_list;
> > -extern struct smk_netlbladdr *smack_netlbladdrs;
> > +extern struct list_head smack_known_list;
> > +extern struct list_head smack_rule_list;
> > +extern struct list_head smk_netlbladdr_list;
> > +
> > extern struct security_operations smack_ops;
> >
> > /*
> > diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
> > index 2e0b83e..5648c2f 100644
> > --- a/security/smack/smack_access.c
> > +++ b/security/smack/smack_access.c
> > @@ -16,48 +16,42 @@
> > #include "smack.h"
> >
> > struct smack_known smack_known_huh = {
> > - .smk_next = NULL,
> > .smk_known = "?",
> > .smk_secid = 2,
> > .smk_cipso = NULL,
> > };
> >
> > struct smack_known smack_known_hat = {
> > - .smk_next = &smack_known_huh,
> > .smk_known = "^",
> > .smk_secid = 3,
> > .smk_cipso = NULL,
> > };
> >
> > struct smack_known smack_known_star = {
> > - .smk_next = &smack_known_hat,
> > .smk_known = "*",
> > .smk_secid = 4,
> > .smk_cipso = NULL,
> > };
> >
> > struct smack_known smack_known_floor = {
> > - .smk_next = &smack_known_star,
> > .smk_known = "_",
> > .smk_secid = 5,
> > .smk_cipso = NULL,
> > };
> >
> > struct smack_known smack_known_invalid = {
> > - .smk_next = &smack_known_floor,
> > .smk_known = "",
> > .smk_secid = 6,
> > .smk_cipso = NULL,
> > };
> >
> > struct smack_known smack_known_web = {
> > - .smk_next = &smack_known_invalid,
> > .smk_known = "@",
> > .smk_secid = 7,
> > .smk_cipso = NULL,
> > };
> >
> > -struct smack_known *smack_known = &smack_known_web;
> > +LIST_HEAD(smack_known_list);
> >
> > /*
> > * The initial value needs to be bigger than any of the
> > @@ -87,7 +81,6 @@ static u32 smack_next_secid = 10;
> > int smk_access(char *subject_label, char *object_label, int request)
> > {
> > u32 may = MAY_NOT;
> > - struct smk_list_entry *sp;
> > struct smack_rule *srp;
> >
> > /*
> > @@ -139,9 +132,8 @@ int smk_access(char *subject_label, char *object_label, int request)
> > * access (e.g. read is included in readwrite) it's
> > * good.
> > */
> > - for (sp = smack_list; sp != NULL; sp = sp->smk_next) {
> > - srp = &sp->smk_rule;
> > -
> > + rcu_read_lock();
> > + list_for_each_entry_rcu(srp, &smack_rule_list, list) {
> > if (srp->smk_subject == subject_label ||
> > strcmp(srp->smk_subject, subject_label) == 0) {
> > if (srp->smk_object == object_label ||
> > @@ -151,6 +143,7 @@ int smk_access(char *subject_label, char *object_label, int request)
> > }
> > }
> > }
> > + rcu_read_unlock();
> > /*
> > * This is a bit map operation.
> > */
> > @@ -228,14 +221,17 @@ struct smack_known *smk_import_entry(const char *string, int len)
> >
> > mutex_lock(&smack_known_lock);
> >
> > - for (skp = smack_known; skp != NULL; skp = skp->smk_next)
> > - if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0)
> > + found = 0;
> > + list_for_each_entry_rcu(skp, &smack_known_list, list) {
> > + if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0) {
> > + found = 1;
> > break;
> > + }
> > + }
> >
> > - if (skp == NULL) {
> > + if (found == 0) {
> > skp = kzalloc(sizeof(struct smack_known), GFP_KERNEL);
> > if (skp != NULL) {
> > - skp->smk_next = smack_known;
> > strncpy(skp->smk_known, smack, SMK_MAXLEN);
> > skp->smk_secid = smack_next_secid++;
> > skp->smk_cipso = NULL;
> > @@ -244,8 +240,7 @@ struct smack_known *smk_import_entry(const char *string, int len)
> > * Make sure that the entry is actually
> > * filled before putting it on the list.
> > */
> > - smp_mb();
> > - smack_known = skp;
> > + list_add_rcu(&skp->list, &smack_known_list);
> > }
> > }
> >
> > @@ -283,14 +278,19 @@ char *smack_from_secid(const u32 secid)
> > {
> > struct smack_known *skp;
> >
> > - for (skp = smack_known; skp != NULL; skp = skp->smk_next)
> > - if (skp->smk_secid == secid)
> > + rcu_read_lock();
> > + list_for_each_entry_rcu(skp, &smack_known_list, list) {
> > + if (skp->smk_secid == secid) {
> > + rcu_read_unlock();
> > return skp->smk_known;
> > + }
> > + }
> >
> > /*
> > * If we got this far someone asked for the translation
> > * of a secid that is not on the list.
> > */
> > + rcu_read_unlock();
> > return smack_known_invalid.smk_known;
> > }
> >
> > @@ -305,9 +305,14 @@ u32 smack_to_secid(const char *smack)
> > {
> > struct smack_known *skp;
> >
> > - for (skp = smack_known; skp != NULL; skp = skp->smk_next)
> > - if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0)
> > + rcu_read_lock();
> > + list_for_each_entry_rcu(skp, &smack_known_list, list) {
> > + if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0) {
> > + rcu_read_unlock();
> > return skp->smk_secid;
> > + }
> > + }
> > + rcu_read_unlock();
> > return 0;
> > }
> >
> > @@ -332,7 +337,8 @@ void smack_from_cipso(u32 level, char *cp, char *result)
> > struct smack_known *kp;
> > char *final = NULL;
> >
> > - for (kp = smack_known; final == NULL && kp != NULL; kp = kp->smk_next) {
> > + rcu_read_lock();
> > + list_for_each_entry(kp, &smack_known_list, list) {
> > if (kp->smk_cipso == NULL)
> > continue;
> >
> > @@ -344,6 +350,7 @@ void smack_from_cipso(u32 level, char *cp, char *result)
> >
> > spin_unlock_bh(&kp->smk_cipsolock);
> > }
> > + rcu_read_unlock();
> > if (final == NULL)
> > final = smack_known_huh.smk_known;
> > strncpy(result, final, SMK_MAXLEN);
> > @@ -360,13 +367,19 @@ void smack_from_cipso(u32 level, char *cp, char *result)
> > int smack_to_cipso(const char *smack, struct smack_cipso *cp)
> > {
> > struct smack_known *kp;
> > + int found = 0;
> >
> > - for (kp = smack_known; kp != NULL; kp = kp->smk_next)
> > + rcu_read_lock();
> > + list_for_each_entry_rcu(kp, &smack_known_list, list) {
> > if (kp->smk_known == smack ||
> > - strcmp(kp->smk_known, smack) == 0)
> > + strcmp(kp->smk_known, smack) == 0) {
> > + found = 1;
> > break;
> > + }
> > + }
> > + rcu_read_unlock();
> >
> > - if (kp == NULL || kp->smk_cipso == NULL)
> > + if (found == 0 || kp->smk_cipso == NULL)
> > return -ENOENT;
> >
> > memcpy(cp, kp->smk_cipso, sizeof(struct smack_cipso));
> > diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> > index e7ded13..fdbb065 100644
> > --- a/security/smack/smack_lsm.c
> > +++ b/security/smack/smack_lsm.c
> > @@ -1510,7 +1510,8 @@ static char *smack_host_label(struct sockaddr_in *sip)
> > if (siap->s_addr == 0)
> > return NULL;
> >
> > - for (snp = smack_netlbladdrs; snp != NULL; snp = snp->smk_next) {
> > + rcu_read_lock();
> > + list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) {
> > /*
> > * we break after finding the first match because
> > * the list is sorted from longest to shortest mask
> > @@ -1518,10 +1519,11 @@ static char *smack_host_label(struct sockaddr_in *sip)
> > */
> > if ((&snp->smk_host.sin_addr)->s_addr ==
> > (siap->s_addr & (&snp->smk_mask)->s_addr)) {
> > + rcu_read_unlock();
> > return snp->smk_label;
> > }
> > }
> > -
> > + rcu_read_unlock();
> > return NULL;
> > }
> >
> > @@ -2934,6 +2936,17 @@ struct security_operations smack_ops = {
> > .release_secctx = smack_release_secctx,
> > };
> >
> > +
> > +static __init void init_smack_know_list(void)
> > +{
> > + list_add(&smack_known_huh.list, &smack_known_list);
> > + list_add(&smack_known_hat.list, &smack_known_list);
> > + list_add(&smack_known_star.list, &smack_known_list);
> > + list_add(&smack_known_floor.list, &smack_known_list);
> > + list_add(&smack_known_invalid.list, &smack_known_list);
> > + list_add(&smack_known_web.list, &smack_known_list);
> > +}
> > +
> > /**
> > * smack_init - initialize the smack system
> > *
> > @@ -2954,6 +2967,8 @@ static __init int smack_init(void)
> > cred = (struct cred *) current->cred;
> > cred->security = &smack_known_floor.smk_known;
> >
> > + /* initilize the smack_know_list */
> > + init_smack_know_list();
> > /*
> > * Initialize locks
> > */
> > diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
> > index 51f0efc..45a975c 100644
> > --- a/security/smack/smackfs.c
> > +++ b/security/smack/smackfs.c
> > @@ -80,10 +80,11 @@ char *smack_onlycap;
> > * Packets are sent there unlabeled, but only from tasks that
> > * can write to the specified label.
> > */
> > -struct smk_netlbladdr *smack_netlbladdrs;
> > +
> > +LIST_HEAD(smk_netlbladdr_list);
> > +LIST_HEAD(smack_rule_list);
> >
> > static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
> > -struct smk_list_entry *smack_list;
> >
> > #define SEQ_READ_FINISHED 1
> >
> > @@ -134,24 +135,27 @@ static void *load_seq_start(struct seq_file *s, loff_t *pos)
> > {
> > if (*pos == SEQ_READ_FINISHED)
> > return NULL;
> > -
> > - return smack_list;
> > + if (list_empty(&smack_rule_list))
> > + return NULL;
> > + return smack_rule_list.next;
> > }
> >
> > static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
> > {
> > - struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next;
> > + struct list_head *list = v;
> >
> > - if (skp == NULL)
> > + if (list_is_last(list, &smack_rule_list)) {
> > *pos = SEQ_READ_FINISHED;
> > -
> > - return skp;
> > + return NULL;
> > + }
> > + return list->next;
> > }
> >
> > static int load_seq_show(struct seq_file *s, void *v)
> > {
> > - struct smk_list_entry *slp = (struct smk_list_entry *) v;
> > - struct smack_rule *srp = &slp->smk_rule;
> > + struct list_head *list = v;
> > + struct smack_rule *srp =
> > + list_entry(list, struct smack_rule, list);
> >
> > seq_printf(s, "%s %s", (char *)srp->smk_subject,
> > (char *)srp->smk_object);
> > @@ -212,32 +216,23 @@ static int smk_open_load(struct inode *inode, struct file *file)
> > */
> > static int smk_set_access(struct smack_rule *srp)
> > {
> > - struct smk_list_entry *sp;
> > - struct smk_list_entry *newp;
> > + struct smack_rule *sp;
> > int ret = 0;
> > -
> > + int found;
> > mutex_lock(&smack_list_lock);
> >
> > - for (sp = smack_list; sp != NULL; sp = sp->smk_next)
> > - if (sp->smk_rule.smk_subject == srp->smk_subject &&
> > - sp->smk_rule.smk_object == srp->smk_object) {
> > - sp->smk_rule.smk_access = srp->smk_access;
> > + found = 0;
> > + list_for_each_entry_rcu(sp, &smack_rule_list, list) {
> > + if (sp->smk_subject == srp->smk_subject &&
> > + sp->smk_object == srp->smk_object) {
> > + found = 1;
> > + sp->smk_access = srp->smk_access;
> > break;
> > }
> > -
> > - if (sp == NULL) {
> > - newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL);
> > - if (newp == NULL) {
> > - ret = -ENOMEM;
> > - goto out;
> > - }
> > -
> > - newp->smk_rule = *srp;
> > - newp->smk_next = smack_list;
> > - smack_list = newp;
> > }
> > + if (found == 0)
> > + list_add_rcu(&srp->list, &smack_rule_list);
> >
> > -out:
> > mutex_unlock(&smack_list_lock);
> >
> > return ret;
> > @@ -261,7 +256,7 @@ out:
> > static ssize_t smk_write_load(struct file *file, const char __user *buf,
> > size_t count, loff_t *ppos)
> > {
> > - struct smack_rule rule;
> > + struct smack_rule *rule;
> > char *data;
> > int rc = -EINVAL;
> >
> > @@ -272,9 +267,8 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
> > */
> > if (!capable(CAP_MAC_ADMIN))
> > return -EPERM;
> > - if (*ppos != 0)
> > - return -EINVAL;
> > - if (count != SMK_LOADLEN)
> > +
> > + if (*ppos != 0 || count != SMK_LOADLEN)
> > return -EINVAL;
> >
> > data = kzalloc(count, GFP_KERNEL);
> > @@ -286,25 +280,31 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
> > goto out;
> > }
> >
> > - rule.smk_subject = smk_import(data, 0);
> > - if (rule.smk_subject == NULL)
> > + rule = kzalloc(sizeof(*rule), GFP_KERNEL);
> > + if (rule == NULL) {
> > + rc = -ENOMEM;
> > goto out;
> > + }
> >
> > - rule.smk_object = smk_import(data + SMK_LABELLEN, 0);
> > - if (rule.smk_object == NULL)
> > - goto out;
> > + rule->smk_subject = smk_import(data, 0);
> > + if (rule->smk_subject == NULL)
> > + goto out_free_rule;
> >
> > - rule.smk_access = 0;
> > + rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
> > + if (rule->smk_object == NULL)
> > + goto out_free_rule;
> > +
> > + rule->smk_access = 0;
> >
> > switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
> > case '-':
> > break;
> > case 'r':
> > case 'R':
> > - rule.smk_access |= MAY_READ;
> > + rule->smk_access |= MAY_READ;
> > break;
> > default:
> > - goto out;
> > + goto out_free_rule;
> > }
> >
> > switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
> > @@ -312,10 +312,10 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
> > break;
> > case 'w':
> > case 'W':
> > - rule.smk_access |= MAY_WRITE;
> > + rule->smk_access |= MAY_WRITE;
> > break;
> > default:
> > - goto out;
> > + goto out_free_rule;
> > }
> >
> > switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
> > @@ -323,10 +323,10 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
> > break;
> > case 'x':
> > case 'X':
> > - rule.smk_access |= MAY_EXEC;
> > + rule->smk_access |= MAY_EXEC;
> > break;
> > default:
> > - goto out;
> > + goto out_free_rule;
> > }
> >
> > switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
> > @@ -334,17 +334,20 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
> > break;
> > case 'a':
> > case 'A':
> > - rule.smk_access |= MAY_APPEND;
> > + rule->smk_access |= MAY_APPEND;
> > break;
> > default:
> > - goto out;
> > + goto out_free_rule;
> > }
> >
> > - rc = smk_set_access(&rule);
> > + rc = smk_set_access(rule);
> >
> > if (!rc)
> > rc = count;
> > + goto out;
> >
> > +out_free_rule:
> > + kfree(rule);
> > out:
> > kfree(data);
> > return rc;
> > @@ -432,24 +435,26 @@ static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
> > {
> > if (*pos == SEQ_READ_FINISHED)
> > return NULL;
> > + if (list_empty(&smack_known_list))
> > + return NULL;
> >
> > - return smack_known;
> > + return smack_known_list.next;
> > }
> >
> > static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
> > {
> > - struct smack_known *skp = ((struct smack_known *) v)->smk_next;
> > + struct list_head *list = v;
> >
> > /*
> > - * Omit labels with no associated cipso value
> > + * labels with no associated cipso value wont be printed
> > + * in cipso_seq_show
> > */
> > - while (skp != NULL && !skp->smk_cipso)
> > - skp = skp->smk_next;
> > -
> > - if (skp == NULL)
> > + if (list_is_last(list, &smack_known_list)) {
> > *pos = SEQ_READ_FINISHED;
> > + return NULL;
> > + }
> >
> > - return skp;
> > + return list->next;
> > }
> >
> > /*
> > @@ -458,7 +463,9 @@ static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
> > */
> > static int cipso_seq_show(struct seq_file *s, void *v)
> > {
> > - struct smack_known *skp = (struct smack_known *) v;
> > + struct list_head *list = v;
> > + struct smack_known *skp =
> > + list_entry(list, struct smack_known, list);
> > struct smack_cipso *scp = skp->smk_cipso;
> > char *cbp;
> > char sep = '/';
> > @@ -637,18 +644,21 @@ static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
> > {
> > if (*pos == SEQ_READ_FINISHED)
> > return NULL;
> > -
> > - return smack_netlbladdrs;
> > + if (list_empty(&smk_netlbladdr_list))
> > + return NULL;
> > + return smk_netlbladdr_list.next;
> > }
> >
> > static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
> > {
> > - struct smk_netlbladdr *skp = ((struct smk_netlbladdr *) v)->smk_next;
> > + struct list_head *list = v;
> >
> > - if (skp == NULL)
> > + if (list_is_last(list, &smk_netlbladdr_list)) {
> > *pos = SEQ_READ_FINISHED;
> > + return NULL;
> > + }
> >
> > - return skp;
> > + return list->next;
> > }
> > #define BEBITS (sizeof(__be32) * 8)
> >
> > @@ -657,7 +667,9 @@ static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
> > */
> > static int netlbladdr_seq_show(struct seq_file *s, void *v)
> > {
> > - struct smk_netlbladdr *skp = (struct smk_netlbladdr *) v;
> > + struct list_head *list = v;
> > + struct smk_netlbladdr *skp =
> > + list_entry(list, struct smk_netlbladdr, list);
> > unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
> > int maskn;
> > u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
> > @@ -701,30 +713,36 @@ static int smk_open_netlbladdr(struct inode *inode, struct file *file)
> > *
> > * This helper insert netlabel in the smack_netlbladdrs list
> > * sorted by netmask length (longest to smallest)
> > + * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
> > + *
> > */
> > static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
> > {
> > - struct smk_netlbladdr *m;
> > + struct smk_netlbladdr *m, *m_next;
> >
> > - if (smack_netlbladdrs == NULL) {
> > - smack_netlbladdrs = new;
> > + if (list_empty(&smk_netlbladdr_list)) {
> > + list_add_rcu(&new->list, &smk_netlbladdr_list);
> > return;
> > }
> >
> > + m = list_entry(rcu_dereference(smk_netlbladdr_list.next),
> > + struct smk_netlbladdr, list);
> > +
> > /* the comparison '>' is a bit hacky, but works */
> > - if (new->smk_mask.s_addr > smack_netlbladdrs->smk_mask.s_addr) {
> > - new->smk_next = smack_netlbladdrs;
> > - smack_netlbladdrs = new;
> > + if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
> > + list_add_rcu(&new->list, &smk_netlbladdr_list);
> > return;
> > }
> > - for (m = smack_netlbladdrs; m != NULL; m = m->smk_next) {
> > - if (m->smk_next == NULL) {
> > - m->smk_next = new;
> > +
> > + list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
> > + if (list_is_last(&m->list, &smk_netlbladdr_list)) {
> > + list_add_rcu(&new->list, &m->list);
> > return;
> > }
> > - if (new->smk_mask.s_addr > m->smk_next->smk_mask.s_addr) {
> > - new->smk_next = m->smk_next;
> > - m->smk_next = new;
> > + m_next = list_entry(rcu_dereference(m->list.next),
> > + struct smk_netlbladdr, list);
> > + if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
> > + list_add_rcu(&new->list, &m->list);
> > return;
> > }
> > }
> > @@ -754,6 +772,7 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
> > struct netlbl_audit audit_info;
> > struct in_addr mask;
> > unsigned int m;
> > + int found;
> > u32 mask_bits = (1<<31);
> > __be32 nsa;
> > u32 temp_mask;
> > @@ -807,14 +826,17 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
> >
> > nsa = newname.sin_addr.s_addr;
> > /* try to find if the prefix is already in the list */
> > - for (skp = smack_netlbladdrs; skp != NULL; skp = skp->smk_next)
> > + found = 0;
> > + list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
> > if (skp->smk_host.sin_addr.s_addr == nsa &&
> > - skp->smk_mask.s_addr == mask.s_addr)
> > + skp->smk_mask.s_addr == mask.s_addr) {
> > + found = 1;
> > break;
> > -
> > + }
> > + }
> > smk_netlabel_audit_set(&audit_info);
> >
> > - if (skp == NULL) {
> > + if (found == 0) {
> > skp = kzalloc(sizeof(*skp), GFP_KERNEL);
> > if (skp == NULL)
> > rc = -ENOMEM;
> >
> >
> > --
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> > Please read the FAQ at http://www.tux.org/lkml/
> >
> >
> >
>
> --
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>
-- James Morris <jmorris@namei.org> -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html