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Smack: smackfs cipso seq read repair

Browse source 
Commit 272cd7a8c6 introduced
a change to the way rule lists are handled and reported in
the smackfs filesystem. One of the issues addressed had to
do with the termination of read requests on /smack/load.
This change introduced a error in /smack/cipso, which shares
some of the same list processing code.

This patch updates all the file access list handling in
smackfs to use the code introduced for /smack/load.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
This commit is contained in:
Casey Schaufler 2011-11-10 15:02:22 -08:00 committed by Casey Schaufler
parent 0e94ae17c8
commit 40809565ca
1 changed files with 39 additions and 76 deletions
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115
security/smack/smackfs.c
View file

@ -102,9 +102,6 @@ static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
const char *smack_cipso_option = SMACK_CIPSO_OPTION;
#define SEQ_READ_FINISHED ((loff_t)-1)
/*
* Values for parsing cipso rules
* SMK_DIGITLEN: Length of a digit field in a rule.
@ -357,10 +354,12 @@ static ssize_t smk_write_load_list(struct file *file, const char __user *buf,
rc = count;
/*
* If this is "load" as opposed to "load-self" and a new rule
* it needs to get added for reporting.
* smk_set_access returns true if there was already a rule
* for the subject/object pair, and false if it was new.
*/
if (!smk_set_access(rule, rule_list, rule_lock)) {
if (load && !smk_set_access(rule, rule_list, rule_lock)) {
smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
if (smlp != NULL) {
smlp->smk_rule = rule;
@ -377,12 +376,12 @@ static ssize_t smk_write_load_list(struct file *file, const char __user *buf,
return rc;
}
/*
* Seq_file read operations for /smack/load
* Core logic for smackfs seq list operations.
*/
static void *load_seq_start(struct seq_file *s, loff_t *pos)
static void *smk_seq_start(struct seq_file *s, loff_t *pos,
struct list_head *head)
{
struct list_head *list;
@ -390,7 +389,7 @@ static void *load_seq_start(struct seq_file *s, loff_t *pos)
* This is 0 the first time through.
*/
if (s->index == 0)
s->private = &smack_rule_list;
s->private = head;
if (s->private == NULL)
return NULL;
@ -404,11 +403,12 @@ static void *load_seq_start(struct seq_file *s, loff_t *pos)
return list;
}
static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
struct list_head *head)
{
struct list_head *list = v;
if (list_is_last(list, &smack_rule_list)) {
if (list_is_last(list, head)) {
s->private = NULL;
return NULL;
}
@ -416,6 +416,25 @@ static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
return list->next;
}
static void smk_seq_stop(struct seq_file *s, void *v)
{
/* No-op */
}
/*
* Seq_file read operations for /smack/load
*/
static void *load_seq_start(struct seq_file *s, loff_t *pos)
{
return smk_seq_start(s, pos, &smack_rule_list);
}
static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
return smk_seq_next(s, v, pos, &smack_rule_list);
}
static int load_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
@ -446,16 +465,11 @@ static int load_seq_show(struct seq_file *s, void *v)
return 0;
}
static void load_seq_stop(struct seq_file *s, void *v)
{
/* No-op */
}
static const struct seq_operations load_seq_ops = {
.start = load_seq_start,
.next = load_seq_next,
.show = load_seq_show,
.stop = load_seq_stop,
.stop = smk_seq_stop,
};
/**
@ -574,28 +588,12 @@ static void smk_unlbl_ambient(char *oldambient)
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_list.next;
return smk_seq_start(s, pos, &smack_known_list);
}
static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct list_head *list = v;
/*
* labels with no associated cipso value wont be printed
* in cipso_seq_show
*/
if (list_is_last(list, &smack_known_list)) {
*pos = SEQ_READ_FINISHED;
return NULL;
}
return list->next;
return smk_seq_next(s, v, pos, &smack_known_list);
}
/*
@ -634,16 +632,11 @@ static int cipso_seq_show(struct seq_file *s, void *v)
return 0;
}
static void cipso_seq_stop(struct seq_file *s, void *v)
{
/* No-op */
}
static const struct seq_operations cipso_seq_ops = {
.start = cipso_seq_start,
.stop = cipso_seq_stop,
.next = cipso_seq_next,
.show = cipso_seq_show,
.stop = smk_seq_stop,
};
/**
@ -788,23 +781,12 @@ static const struct file_operations smk_cipso_ops = {
static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
{
if (*pos == SEQ_READ_FINISHED)
return NULL;
if (list_empty(&smk_netlbladdr_list))
return NULL;
return smk_netlbladdr_list.next;
return smk_seq_start(s, pos, &smk_netlbladdr_list);
}
static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct list_head *list = v;
if (list_is_last(list, &smk_netlbladdr_list)) {
*pos = SEQ_READ_FINISHED;
return NULL;
}
return list->next;
return smk_seq_next(s, v, pos, &smk_netlbladdr_list);
}
#define BEBITS (sizeof(__be32) * 8)
@ -828,16 +810,11 @@ static int netlbladdr_seq_show(struct seq_file *s, void *v)
return 0;
}
static void netlbladdr_seq_stop(struct seq_file *s, void *v)
{
/* No-op */
}
static const struct seq_operations netlbladdr_seq_ops = {
.start = netlbladdr_seq_start,
.stop = netlbladdr_seq_stop,
.next = netlbladdr_seq_next,
.show = netlbladdr_seq_show,
.stop = smk_seq_stop,
};
/**
@ -1405,23 +1382,14 @@ static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
{
struct task_smack *tsp = current_security();
if (*pos == SEQ_READ_FINISHED)
return NULL;
if (list_empty(&tsp->smk_rules))
return NULL;
return tsp->smk_rules.next;
return smk_seq_start(s, pos, &tsp->smk_rules);
}
static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct task_smack *tsp = current_security();
struct list_head *list = v;
if (list_is_last(list, &tsp->smk_rules)) {
*pos = SEQ_READ_FINISHED;
return NULL;
}
return list->next;
return smk_seq_next(s, v, pos, &tsp->smk_rules);
}
static int load_self_seq_show(struct seq_file *s, void *v)
@ -1453,16 +1421,11 @@ static int load_self_seq_show(struct seq_file *s, void *v)
return 0;
}
static void load_self_seq_stop(struct seq_file *s, void *v)
{
/* No-op */
}
static const struct seq_operations load_self_seq_ops = {
.start = load_self_seq_start,
.next = load_self_seq_next,
.show = load_self_seq_show,
.stop = load_self_seq_stop,
.stop = smk_seq_stop,
};