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-rw-r--r--security/selinux/ss/policydb.c166
-rw-r--r--security/selinux/ss/policydb.h8
-rw-r--r--security/selinux/ss/services.c16
3 files changed, 110 insertions, 80 deletions
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index 4b4efd3c0b3c..32b3a8acf96f 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -336,11 +336,17 @@ static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
static int filenametr_destroy(void *key, void *datum, void *p)
{
- struct filename_trans *ft = key;
+ struct filename_trans_key *ft = key;
+ struct filename_trans_datum *next, *d = datum;
kfree(ft->name);
kfree(key);
- kfree(datum);
+ do {
+ ebitmap_destroy(&d->stypes);
+ next = d->next;
+ kfree(d);
+ d = next;
+ } while (unlikely(d));
cond_resched();
return 0;
}
@@ -406,12 +412,12 @@ out:
static u32 filenametr_hash(struct hashtab *h, const void *k)
{
- const struct filename_trans *ft = k;
+ const struct filename_trans_key *ft = k;
unsigned long hash;
unsigned int byte_num;
unsigned char focus;
- hash = ft->stype ^ ft->ttype ^ ft->tclass;
+ hash = ft->ttype ^ ft->tclass;
byte_num = 0;
while ((focus = ft->name[byte_num++]))
@@ -421,14 +427,10 @@ static u32 filenametr_hash(struct hashtab *h, const void *k)
static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
{
- const struct filename_trans *ft1 = k1;
- const struct filename_trans *ft2 = k2;
+ const struct filename_trans_key *ft1 = k1;
+ const struct filename_trans_key *ft2 = k2;
int v;
- v = ft1->stype - ft2->stype;
- if (v)
- return v;
-
v = ft1->ttype - ft2->ttype;
if (v)
return v;
@@ -495,7 +497,7 @@ static int policydb_init(struct policydb *p)
goto out;
p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp,
- (1 << 10));
+ (1 << 11));
if (!p->filename_trans) {
rc = -ENOMEM;
goto out;
@@ -1882,64 +1884,84 @@ out:
static int filename_trans_read_one(struct policydb *p, void *fp)
{
- struct filename_trans *ft;
- struct filename_trans_datum *otype = NULL;
+ struct filename_trans_key key, *ft = NULL;
+ struct filename_trans_datum *last, *datum = NULL;
char *name = NULL;
- u32 len;
+ u32 len, stype, otype;
__le32 buf[4];
int rc;
- ft = kzalloc(sizeof(*ft), GFP_KERNEL);
- if (!ft)
- return -ENOMEM;
-
- rc = -ENOMEM;
- otype = kmalloc(sizeof(*otype), GFP_KERNEL);
- if (!otype)
- goto out;
-
/* length of the path component string */
rc = next_entry(buf, fp, sizeof(u32));
if (rc)
- goto out;
+ return rc;
len = le32_to_cpu(buf[0]);
/* path component string */
rc = str_read(&name, GFP_KERNEL, fp, len);
if (rc)
- goto out;
-
- ft->name = name;
+ return rc;
rc = next_entry(buf, fp, sizeof(u32) * 4);
if (rc)
goto out;
- ft->stype = le32_to_cpu(buf[0]);
- ft->ttype = le32_to_cpu(buf[1]);
- ft->tclass = le32_to_cpu(buf[2]);
+ stype = le32_to_cpu(buf[0]);
+ key.ttype = le32_to_cpu(buf[1]);
+ key.tclass = le32_to_cpu(buf[2]);
+ key.name = name;
- otype->otype = le32_to_cpu(buf[3]);
+ otype = le32_to_cpu(buf[3]);
- rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
- if (rc)
- goto out;
+ last = NULL;
+ datum = hashtab_search(p->filename_trans, &key);
+ while (datum) {
+ if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) {
+ /* conflicting/duplicate rules are ignored */
+ datum = NULL;
+ goto out;
+ }
+ if (likely(datum->otype == otype))
+ break;
+ last = datum;
+ datum = datum->next;
+ }
+ if (!datum) {
+ rc = -ENOMEM;
+ datum = kmalloc(sizeof(*datum), GFP_KERNEL);
+ if (!datum)
+ goto out;
- rc = hashtab_insert(p->filename_trans, ft, otype);
- if (rc) {
- /*
- * Do not return -EEXIST to the caller, or the system
- * will not boot.
- */
- if (rc == -EEXIST)
- rc = 0;
- goto out;
+ ebitmap_init(&datum->stypes);
+ datum->otype = otype;
+ datum->next = NULL;
+
+ if (unlikely(last)) {
+ last->next = datum;
+ } else {
+ rc = -ENOMEM;
+ ft = kmemdup(&key, sizeof(key), GFP_KERNEL);
+ if (!ft)
+ goto out;
+
+ rc = hashtab_insert(p->filename_trans, ft, datum);
+ if (rc)
+ goto out;
+ name = NULL;
+
+ rc = ebitmap_set_bit(&p->filename_trans_ttypes,
+ key.ttype, 1);
+ if (rc)
+ return rc;
+ }
}
- return 0;
+ kfree(name);
+ return ebitmap_set_bit(&datum->stypes, stype - 1, 1);
+
out:
kfree(ft);
kfree(name);
- kfree(otype);
+ kfree(datum);
return rc;
}
@@ -1957,6 +1979,8 @@ static int filename_trans_read(struct policydb *p, void *fp)
return rc;
nel = le32_to_cpu(buf[0]);
+ p->filename_trans_count = nel;
+
for (i = 0; i < nel; i++) {
rc = filename_trans_read_one(p, fp);
if (rc)
@@ -3334,50 +3358,50 @@ static int range_write(struct policydb *p, void *fp)
static int filename_write_helper(void *key, void *data, void *ptr)
{
- __le32 buf[4];
- struct filename_trans *ft = key;
- struct filename_trans_datum *otype = data;
+ struct filename_trans_key *ft = key;
+ struct filename_trans_datum *datum = data;
+ struct ebitmap_node *node;
void *fp = ptr;
+ __le32 buf[4];
int rc;
- u32 len;
+ u32 bit, len = strlen(ft->name);
- len = strlen(ft->name);
- buf[0] = cpu_to_le32(len);
- rc = put_entry(buf, sizeof(u32), 1, fp);
- if (rc)
- return rc;
+ do {
+ ebitmap_for_each_positive_bit(&datum->stypes, node, bit) {
+ buf[0] = cpu_to_le32(len);
+ rc = put_entry(buf, sizeof(u32), 1, fp);
+ if (rc)
+ return rc;
- rc = put_entry(ft->name, sizeof(char), len, fp);
- if (rc)
- return rc;
+ rc = put_entry(ft->name, sizeof(char), len, fp);
+ if (rc)
+ return rc;
- buf[0] = cpu_to_le32(ft->stype);
- buf[1] = cpu_to_le32(ft->ttype);
- buf[2] = cpu_to_le32(ft->tclass);
- buf[3] = cpu_to_le32(otype->otype);
+ buf[0] = cpu_to_le32(bit + 1);
+ buf[1] = cpu_to_le32(ft->ttype);
+ buf[2] = cpu_to_le32(ft->tclass);
+ buf[3] = cpu_to_le32(datum->otype);
- rc = put_entry(buf, sizeof(u32), 4, fp);
- if (rc)
- return rc;
+ rc = put_entry(buf, sizeof(u32), 4, fp);
+ if (rc)
+ return rc;
+ }
+
+ datum = datum->next;
+ } while (unlikely(datum));
return 0;
}
static int filename_trans_write(struct policydb *p, void *fp)
{
- u32 nel;
__le32 buf[1];
int rc;
if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
return 0;
- nel = 0;
- rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
- if (rc)
- return rc;
-
- buf[0] = cpu_to_le32(nel);
+ buf[0] = cpu_to_le32(p->filename_trans_count);
rc = put_entry(buf, sizeof(u32), 1, fp);
if (rc)
return rc;
diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h
index 6459616f8487..41ad78a1f17b 100644
--- a/security/selinux/ss/policydb.h
+++ b/security/selinux/ss/policydb.h
@@ -89,15 +89,16 @@ struct role_trans {
struct role_trans *next;
};
-struct filename_trans {
- u32 stype; /* current process */
+struct filename_trans_key {
u32 ttype; /* parent dir context */
u16 tclass; /* class of new object */
const char *name; /* last path component */
};
struct filename_trans_datum {
- u32 otype; /* expected of new object */
+ struct ebitmap stypes; /* bitmap of source types for this otype */
+ u32 otype; /* resulting type of new object */
+ struct filename_trans_datum *next; /* record for next otype*/
};
struct role_allow {
@@ -267,6 +268,7 @@ struct policydb {
struct ebitmap filename_trans_ttypes;
/* actual set of filename_trans rules */
struct hashtab *filename_trans;
+ u32 filename_trans_count;
/* bools indexed by (value - 1) */
struct cond_bool_datum **bool_val_to_struct;
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 57b2c6252799..f90e6550eec8 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1692,8 +1692,8 @@ static void filename_compute_type(struct policydb *policydb,
u32 stype, u32 ttype, u16 tclass,
const char *objname)
{
- struct filename_trans ft;
- struct filename_trans_datum *otype;
+ struct filename_trans_key ft;
+ struct filename_trans_datum *datum;
/*
* Most filename trans rules are going to live in specific directories
@@ -1703,14 +1703,18 @@ static void filename_compute_type(struct policydb *policydb,
if (!ebitmap_get_bit(&policydb->filename_trans_ttypes, ttype))
return;
- ft.stype = stype;
ft.ttype = ttype;
ft.tclass = tclass;
ft.name = objname;
- otype = hashtab_search(policydb->filename_trans, &ft);
- if (otype)
- newcontext->type = otype->otype;
+ datum = hashtab_search(policydb->filename_trans, &ft);
+ while (datum) {
+ if (ebitmap_get_bit(&datum->stypes, stype - 1)) {
+ newcontext->type = datum->otype;
+ return;
+ }
+ datum = datum->next;
+ }
}
static int security_compute_sid(struct selinux_state *state,
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 12:22:15 +0000