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apparmor: add strn version of lookup_profile fn 

Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2017-01-16 00:42:21 -08:00
parent 8399588a7f
commit 1741e9eb8c
2 changed files with 27 additions and 11 deletions
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2
security/apparmor/include/policy.h
View File

@ -177,6 +177,8 @@ struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat);
void aa_free_profile(struct aa_profile *profile);
void aa_free_profile_kref(struct kref *kref);
struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname,
size_t n);
struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name);
struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name);

36
security/apparmor/policy.c
View File

@ -427,9 +427,10 @@ static struct aa_policy *__lookup_parent(struct aa_ns *ns,
}
/**
* __lookup_profile - lookup the profile matching @hname
* __lookupn_profile - lookup the profile matching @hname
* @base: base list to start looking up profile name from (NOT NULL)
* @hname: hierarchical profile name (NOT NULL)
* @n: length of @hname
*
* Requires: rcu_read_lock be held
*
@ -437,53 +438,66 @@ static struct aa_policy *__lookup_parent(struct aa_ns *ns,
*
* Do a relative name lookup, recursing through profile tree.
*/
static struct aa_profile *__lookup_profile(struct aa_policy *base,
const char *hname)
static struct aa_profile *__lookupn_profile(struct aa_policy *base,
const char *hname, size_t n)
{
struct aa_profile *profile = NULL;
char *split;
const char *split;
for (split = strstr(hname, "//"); split;) {
for (split = strnstr(hname, "//", n); split;
split = strnstr(hname, "//", n)) {
profile = __strn_find_child(&base->profiles, hname,
split - hname);
if (!profile)
return NULL;
base = &profile->base;
n -= split + 2 - hname;
hname = split + 2;
split = strstr(hname, "//");
}
profile = __find_child(&base->profiles, hname);
if (n)
return __strn_find_child(&base->profiles, hname, n);
return NULL;
}
return profile;
static struct aa_profile *__lookup_profile(struct aa_policy *base,
const char *hname)
{
return __lookupn_profile(base, hname, strlen(hname));
}
/**
* aa_lookup_profile - find a profile by its full or partial name
* @ns: the namespace to start from (NOT NULL)
* @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL)
* @n: size of @hname
*
* Returns: refcounted profile or NULL if not found
*/
struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname)
struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname,
size_t n)
{
struct aa_profile *profile;
rcu_read_lock();
do {
profile = __lookup_profile(&ns->base, hname);
profile = __lookupn_profile(&ns->base, hname, n);
} while (profile && !aa_get_profile_not0(profile));
rcu_read_unlock();
/* the unconfined profile is not in the regular profile list */
if (!profile && strcmp(hname, "unconfined") == 0)
if (!profile && strncmp(hname, "unconfined", n) == 0)
profile = aa_get_newest_profile(ns->unconfined);
/* refcount released by caller */
return profile;
}
struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname)
{
return aa_lookupn_profile(ns, hname, strlen(hname));
}
/**
* replacement_allowed - test to see if replacement is allowed
* @profile: profile to test if it can be replaced (MAYBE NULL)