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apparmor: fix blob compression when ns is forced on a policy load 

When blob compression is turned on, if the policy namespace is forced
onto a policy load, the policy load will fail as the namespace name
being referenced is inside the compressed policy blob, resulting in
invalid or names that are too long. So duplicate the name before the
blob is compressed.

Fixes: 876dd866c084 ("apparmor: Initial implementation of raw policy blob compression")
Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2019-03-09 16:58:10 -08:00
parent fe166a9f28
commit 145a0ef21c
2 changed files with 8 additions and 4 deletions
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3
security/apparmor/policy.c
View File

@ -861,7 +861,7 @@ static struct aa_profile *update_to_newest_parent(struct aa_profile *new)
ssize_t aa_replace_profiles(struct aa_ns *policy_ns, struct aa_label *label,
u32 mask, struct aa_loaddata *udata)
{
const char *ns_name, *info = NULL;
const char *ns_name = NULL, *info = NULL;
struct aa_ns *ns = NULL;
struct aa_load_ent *ent, *tmp;
struct aa_loaddata *rawdata_ent;
@ -1048,6 +1048,7 @@ ssize_t aa_replace_profiles(struct aa_ns *policy_ns, struct aa_label *label,
out:
aa_put_ns(ns);
aa_put_loaddata(udata);
kfree(ns_name);
if (error)
return error;

9
security/apparmor/policy_unpack.c
View File

@ -944,11 +944,14 @@ static int verify_header(struct aa_ext *e, int required, const char **ns)
e, error);
return error;
}
if (*ns && strcmp(*ns, name))
if (*ns && strcmp(*ns, name)) {
audit_iface(NULL, NULL, NULL, "invalid ns change", e,
error);
else if (!*ns)
*ns = name;
} else if (!*ns) {
*ns = kstrdup(name, GFP_KERNEL);
if (!*ns)
return -ENOMEM;
}
}
return 0;