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path: root/security/apparmor/policy_unpack.c
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Diffstat (limited to 'security/apparmor/policy_unpack.c')
-rw-r--r--security/apparmor/policy_unpack.c105
1 files changed, 87 insertions, 18 deletions
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index c600f4dd1783..5a2aec358322 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -85,9 +85,9 @@ static void audit_cb(struct audit_buffer *ab, void *va)
audit_log_format(ab, " ns=");
audit_log_untrustedstring(ab, aad(sa)->iface.ns);
}
- if (aad(sa)->iface.name) {
+ if (aad(sa)->name) {
audit_log_format(ab, " name=");
- audit_log_untrustedstring(ab, aad(sa)->iface.name);
+ audit_log_untrustedstring(ab, aad(sa)->name);
}
if (aad(sa)->iface.pos)
audit_log_format(ab, " offset=%ld", aad(sa)->iface.pos);
@@ -114,9 +114,9 @@ static int audit_iface(struct aa_profile *new, const char *ns_name,
aad(&sa)->iface.pos = e->pos - e->start;
aad(&sa)->iface.ns = ns_name;
if (new)
- aad(&sa)->iface.name = new->base.hname;
+ aad(&sa)->name = new->base.hname;
else
- aad(&sa)->iface.name = name;
+ aad(&sa)->name = name;
aad(&sa)->info = info;
aad(&sa)->error = error;
@@ -275,6 +275,19 @@ fail:
return 0;
}
+static bool unpack_u16(struct aa_ext *e, u16 *data, const char *name)
+{
+ if (unpack_nameX(e, AA_U16, name)) {
+ if (!inbounds(e, sizeof(u16)))
+ return 0;
+ if (data)
+ *data = le16_to_cpu(get_unaligned((__le16 *) e->pos));
+ e->pos += sizeof(u16);
+ return 1;
+ }
+ return 0;
+}
+
static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name)
{
if (unpack_nameX(e, AA_U32, name)) {
@@ -448,7 +461,7 @@ fail:
*/
static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile)
{
- void *pos = e->pos;
+ void *saved_pos = e->pos;
/* exec table is optional */
if (unpack_nameX(e, AA_STRUCT, "xtable")) {
@@ -511,7 +524,7 @@ static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile)
fail:
aa_free_domain_entries(&profile->file.trans);
- e->pos = pos;
+ e->pos = saved_pos;
return 0;
}
@@ -583,7 +596,8 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
{
struct aa_profile *profile = NULL;
const char *tmpname, *tmpns = NULL, *name = NULL;
- size_t ns_len;
+ const char *info = "failed to unpack profile";
+ size_t size = 0, ns_len;
struct rhashtable_params params = { 0 };
char *key = NULL;
struct aa_data *data;
@@ -604,8 +618,10 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
tmpname = aa_splitn_fqname(name, strlen(name), &tmpns, &ns_len);
if (tmpns) {
*ns_name = kstrndup(tmpns, ns_len, GFP_KERNEL);
- if (!*ns_name)
+ if (!*ns_name) {
+ info = "out of memory";
goto fail;
+ }
name = tmpname;
}
@@ -624,12 +640,15 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
if (IS_ERR(profile->xmatch)) {
error = PTR_ERR(profile->xmatch);
profile->xmatch = NULL;
+ info = "bad xmatch";
goto fail;
}
/* xmatch_len is not optional if xmatch is set */
if (profile->xmatch) {
- if (!unpack_u32(e, &tmp, NULL))
+ if (!unpack_u32(e, &tmp, NULL)) {
+ info = "missing xmatch len";
goto fail;
+ }
profile->xmatch_len = tmp;
}
@@ -637,8 +656,11 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
(void) unpack_str(e, &profile->disconnected, "disconnected");
/* per profile debug flags (complain, audit) */
- if (!unpack_nameX(e, AA_STRUCT, "flags"))
+ if (!unpack_nameX(e, AA_STRUCT, "flags")) {
+ info = "profile missing flags";
goto fail;
+ }
+ info = "failed to unpack profile flags";
if (!unpack_u32(e, &tmp, NULL))
goto fail;
if (tmp & PACKED_FLAG_HAT)
@@ -667,6 +689,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
/* set a default value if path_flags field is not present */
profile->path_flags = PATH_MEDIATE_DELETED;
+ info = "failed to unpack profile capabilities";
if (!unpack_u32(e, &(profile->caps.allow.cap[0]), NULL))
goto fail;
if (!unpack_u32(e, &(profile->caps.audit.cap[0]), NULL))
@@ -676,6 +699,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
if (!unpack_u32(e, &tmpcap.cap[0], NULL))
goto fail;
+ info = "failed to unpack upper profile capabilities";
if (unpack_nameX(e, AA_STRUCT, "caps64")) {
/* optional upper half of 64 bit caps */
if (!unpack_u32(e, &(profile->caps.allow.cap[1]), NULL))
@@ -690,6 +714,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
goto fail;
}
+ info = "failed to unpack extended profile capabilities";
if (unpack_nameX(e, AA_STRUCT, "capsx")) {
/* optional extended caps mediation mask */
if (!unpack_u32(e, &(profile->caps.extended.cap[0]), NULL))
@@ -700,11 +725,46 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
goto fail;
}
- if (!unpack_rlimits(e, profile))
+ if (!unpack_rlimits(e, profile)) {
+ info = "failed to unpack profile rlimits";
goto fail;
+ }
+
+ size = unpack_array(e, "net_allowed_af");
+ if (size) {
+
+ for (i = 0; i < size; i++) {
+ /* discard extraneous rules that this kernel will
+ * never request
+ */
+ if (i >= AF_MAX) {
+ u16 tmp;
+
+ if (!unpack_u16(e, &tmp, NULL) ||
+ !unpack_u16(e, &tmp, NULL) ||
+ !unpack_u16(e, &tmp, NULL))
+ goto fail;
+ continue;
+ }
+ if (!unpack_u16(e, &profile->net.allow[i], NULL))
+ goto fail;
+ if (!unpack_u16(e, &profile->net.audit[i], NULL))
+ goto fail;
+ if (!unpack_u16(e, &profile->net.quiet[i], NULL))
+ goto fail;
+ }
+ if (!unpack_nameX(e, AA_ARRAYEND, NULL))
+ goto fail;
+ }
+ if (VERSION_LT(e->version, v7)) {
+ /* pre v7 policy always allowed these */
+ profile->net.allow[AF_UNIX] = 0xffff;
+ profile->net.allow[AF_NETLINK] = 0xffff;
+ }
if (unpack_nameX(e, AA_STRUCT, "policydb")) {
/* generic policy dfa - optional and may be NULL */
+ info = "failed to unpack policydb";
profile->policy.dfa = unpack_dfa(e);
if (IS_ERR(profile->policy.dfa)) {
error = PTR_ERR(profile->policy.dfa);
@@ -734,6 +794,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
if (IS_ERR(profile->file.dfa)) {
error = PTR_ERR(profile->file.dfa);
profile->file.dfa = NULL;
+ info = "failed to unpack profile file rules";
goto fail;
} else if (profile->file.dfa) {
if (!unpack_u32(e, &profile->file.start, "dfa_start"))
@@ -746,10 +807,13 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
} else
profile->file.dfa = aa_get_dfa(nulldfa);
- if (!unpack_trans_table(e, profile))
+ if (!unpack_trans_table(e, profile)) {
+ info = "failed to unpack profile transition table";
goto fail;
+ }
if (unpack_nameX(e, AA_STRUCT, "data")) {
+ info = "out of memory";
profile->data = kzalloc(sizeof(*profile->data), GFP_KERNEL);
if (!profile->data)
goto fail;
@@ -761,8 +825,10 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
params.hashfn = strhash;
params.obj_cmpfn = datacmp;
- if (rhashtable_init(profile->data, &params))
+ if (rhashtable_init(profile->data, &params)) {
+ info = "failed to init key, value hash table";
goto fail;
+ }
while (unpack_strdup(e, &key, NULL)) {
data = kzalloc(sizeof(*data), GFP_KERNEL);
@@ -784,12 +850,16 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
profile->data->p);
}
- if (!unpack_nameX(e, AA_STRUCTEND, NULL))
+ if (!unpack_nameX(e, AA_STRUCTEND, NULL)) {
+ info = "failed to unpack end of key, value data table";
goto fail;
+ }
}
- if (!unpack_nameX(e, AA_STRUCTEND, NULL))
+ if (!unpack_nameX(e, AA_STRUCTEND, NULL)) {
+ info = "failed to unpack end of profile";
goto fail;
+ }
return profile;
@@ -798,8 +868,7 @@ fail:
name = NULL;
else if (!name)
name = "unknown";
- audit_iface(profile, NULL, name, "failed to unpack profile", e,
- error);
+ audit_iface(profile, NULL, name, info, e, error);
aa_free_profile(profile);
return ERR_PTR(error);
@@ -832,7 +901,7 @@ static int verify_header(struct aa_ext *e, int required, const char **ns)
* if not specified use previous version
* Mask off everything that is not kernel abi version
*/
- if (VERSION_LT(e->version, v5) && VERSION_GT(e->version, v7)) {
+ if (VERSION_LT(e->version, v5) || VERSION_GT(e->version, v7)) {
audit_iface(NULL, NULL, NULL, "unsupported interface version",
e, error);
return error;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.