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authorEric Paris <eparis@redhat.com>2010-07-21 12:50:57 -0400
committerJames Morris <jmorris@namei.org>2010-08-02 15:35:05 +1000
commitd1b43547e56b163bc5c622243c47d8a13626175b (patch)
tree29b2ddd50b3a0c6fe4dcf5f78c55c8698cd11679 /security
parent9a7982793c3aee6ce86d8e7e15306215257329f2 (diff)
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SELinux: move genfs read to a separate function
move genfs read functionality out of policydb_read() and into a new function called genfs_read() Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Stephen D. Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/ss/policydb.c238
1 files changed, 133 insertions, 105 deletions
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index a39d38af220..4ea073eaf8b 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -655,6 +655,9 @@ static int range_tr_destroy(void *key, void *datum, void *p)
static void ocontext_destroy(struct ocontext *c, int i)
{
+ if (!c)
+ return;
+
context_destroy(&c->context[0]);
context_destroy(&c->context[1]);
if (i == OCON_ISID || i == OCON_FS ||
@@ -1773,6 +1776,131 @@ out:
return rc;
}
+static int genfs_read(struct policydb *p, void *fp)
+{
+ int i, j, rc;
+ u32 nel, nel2, len, len2;
+ __le32 buf[1];
+ struct ocontext *l, *c;
+ struct ocontext *newc = NULL;
+ struct genfs *genfs_p, *genfs;
+ struct genfs *newgenfs = NULL;
+
+ rc = next_entry(buf, fp, sizeof(u32));
+ if (rc)
+ goto out;
+ nel = le32_to_cpu(buf[0]);
+
+ for (i = 0; i < nel; i++) {
+ rc = next_entry(buf, fp, sizeof(u32));
+ if (rc)
+ goto out;
+ len = le32_to_cpu(buf[0]);
+
+ rc = -ENOMEM;
+ newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
+ if (!newgenfs)
+ goto out;
+
+ rc = -ENOMEM;
+ newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
+ if (!newgenfs->fstype)
+ goto out;
+
+ rc = next_entry(newgenfs->fstype, fp, len);
+ if (rc)
+ goto out;
+
+ newgenfs->fstype[len] = 0;
+
+ for (genfs_p = NULL, genfs = p->genfs; genfs;
+ genfs_p = genfs, genfs = genfs->next) {
+ rc = -EINVAL;
+ if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
+ printk(KERN_ERR "SELinux: dup genfs fstype %s\n",
+ newgenfs->fstype);
+ goto out;
+ }
+ if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
+ break;
+ }
+ newgenfs->next = genfs;
+ if (genfs_p)
+ genfs_p->next = newgenfs;
+ else
+ p->genfs = newgenfs;
+ genfs = newgenfs;
+ newgenfs = NULL;
+
+ rc = next_entry(buf, fp, sizeof(u32));
+ if (rc)
+ goto out;
+
+ nel2 = le32_to_cpu(buf[0]);
+ for (j = 0; j < nel2; j++) {
+ rc = next_entry(buf, fp, sizeof(u32));
+ if (rc)
+ goto out;
+ len = le32_to_cpu(buf[0]);
+
+ rc = -ENOMEM;
+ newc = kzalloc(sizeof(*newc), GFP_KERNEL);
+ if (!newc)
+ goto out;
+
+ rc = -ENOMEM;
+ newc->u.name = kmalloc(len + 1, GFP_KERNEL);
+ if (!newc->u.name)
+ goto out;
+
+ rc = next_entry(newc->u.name, fp, len);
+ if (rc)
+ goto out;
+ newc->u.name[len] = 0;
+
+ rc = next_entry(buf, fp, sizeof(u32));
+ if (rc)
+ goto out;
+
+ newc->v.sclass = le32_to_cpu(buf[0]);
+ rc = context_read_and_validate(&newc->context[0], p, fp);
+ if (rc)
+ goto out;
+
+ for (l = NULL, c = genfs->head; c;
+ l = c, c = c->next) {
+ rc = -EINVAL;
+ if (!strcmp(newc->u.name, c->u.name) &&
+ (!c->v.sclass || !newc->v.sclass ||
+ newc->v.sclass == c->v.sclass)) {
+ printk(KERN_ERR "SELinux: dup genfs entry (%s,%s)\n",
+ genfs->fstype, c->u.name);
+ goto out;
+ }
+ len = strlen(newc->u.name);
+ len2 = strlen(c->u.name);
+ if (len > len2)
+ break;
+ }
+
+ newc->next = c;
+ if (l)
+ l->next = newc;
+ else
+ genfs->head = newc;
+ newc = NULL;
+ }
+ }
+ rc = 0;
+out:
+ if (newgenfs)
+ kfree(newgenfs->fstype);
+ kfree(newgenfs);
+ ocontext_destroy(newc, OCON_FSUSE);
+
+ return rc;
+}
+
/*
* Read the configuration data from a policy database binary
* representation file into a policy database structure.
@@ -1781,12 +1909,12 @@ int policydb_read(struct policydb *p, void *fp)
{
struct role_allow *ra, *lra;
struct role_trans *tr, *ltr;
- struct ocontext *l, *c, *newc;
- struct genfs *genfs_p, *genfs, *newgenfs;
+ struct ocontext *l, *c;
int i, j, rc;
__le32 buf[4];
u32 nodebuf[8];
- u32 len, len2, nprim, nel, nel2;
+ u32 len, nprim, nel;
+
char *policydb_str;
struct policydb_compat_info *info;
@@ -2099,107 +2227,9 @@ int policydb_read(struct policydb *p, void *fp)
}
}
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc < 0)
+ rc = genfs_read(p, fp);
+ if (rc)
goto bad;
- nel = le32_to_cpu(buf[0]);
- genfs_p = NULL;
- rc = -EINVAL;
- for (i = 0; i < nel; i++) {
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc < 0)
- goto bad;
- len = le32_to_cpu(buf[0]);
- newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
- if (!newgenfs) {
- rc = -ENOMEM;
- goto bad;
- }
-
- newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
- if (!newgenfs->fstype) {
- rc = -ENOMEM;
- kfree(newgenfs);
- goto bad;
- }
- rc = next_entry(newgenfs->fstype, fp, len);
- if (rc < 0) {
- kfree(newgenfs->fstype);
- kfree(newgenfs);
- goto bad;
- }
- newgenfs->fstype[len] = 0;
- for (genfs_p = NULL, genfs = p->genfs; genfs;
- genfs_p = genfs, genfs = genfs->next) {
- if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
- printk(KERN_ERR "SELinux: dup genfs "
- "fstype %s\n", newgenfs->fstype);
- kfree(newgenfs->fstype);
- kfree(newgenfs);
- goto bad;
- }
- if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
- break;
- }
- newgenfs->next = genfs;
- if (genfs_p)
- genfs_p->next = newgenfs;
- else
- p->genfs = newgenfs;
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc < 0)
- goto bad;
- nel2 = le32_to_cpu(buf[0]);
- for (j = 0; j < nel2; j++) {
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc < 0)
- goto bad;
- len = le32_to_cpu(buf[0]);
-
- newc = kzalloc(sizeof(*newc), GFP_KERNEL);
- if (!newc) {
- rc = -ENOMEM;
- goto bad;
- }
-
- newc->u.name = kmalloc(len + 1, GFP_KERNEL);
- if (!newc->u.name) {
- rc = -ENOMEM;
- goto bad_newc;
- }
- rc = next_entry(newc->u.name, fp, len);
- if (rc < 0)
- goto bad_newc;
- newc->u.name[len] = 0;
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc < 0)
- goto bad_newc;
- newc->v.sclass = le32_to_cpu(buf[0]);
- if (context_read_and_validate(&newc->context[0], p, fp))
- goto bad_newc;
- for (l = NULL, c = newgenfs->head; c;
- l = c, c = c->next) {
- if (!strcmp(newc->u.name, c->u.name) &&
- (!c->v.sclass || !newc->v.sclass ||
- newc->v.sclass == c->v.sclass)) {
- printk(KERN_ERR "SELinux: dup genfs "
- "entry (%s,%s)\n",
- newgenfs->fstype, c->u.name);
- goto bad_newc;
- }
- len = strlen(newc->u.name);
- len2 = strlen(c->u.name);
- if (len > len2)
- break;
- }
-
- newc->next = c;
- if (l)
- l->next = newc;
- else
- newgenfs->head = newc;
- }
- }
rc = range_read(p, fp);
if (rc)
@@ -2227,8 +2257,6 @@ int policydb_read(struct policydb *p, void *fp)
rc = 0;
out:
return rc;
-bad_newc:
- ocontext_destroy(newc, OCON_FSUSE);
bad:
if (!rc)
rc = -EINVAL;