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apparmor: convert profile lists to RCU based locking

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Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen
2013-07-10 21:06:43 -07:00
parent dd51c84857
commit 01e2b670aa
4 changed files with 167 additions and 111 deletions
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14
security/apparmor/domain.c
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@@ -144,7 +144,7 @@ static struct aa_profile *__attach_match(const char *name,
int len = 0;
struct aa_profile *profile, *candidate = NULL;
list_for_each_entry(profile, head, base.list) {
list_for_each_entry_rcu(profile, head, base.list) {
if (profile->flags & PFLAG_NULL)
continue;
if (profile->xmatch && profile->xmatch_len > len) {
@@ -177,9 +177,9 @@ static struct aa_profile *find_attach(struct aa_namespace *ns,
{
struct aa_profile *profile;
read_lock(&ns->lock);
rcu_read_lock();
profile = aa_get_profile(__attach_match(name, list));
read_unlock(&ns->lock);
rcu_read_unlock();
return profile;
}
@@ -641,7 +641,10 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
if (count) {
/* attempting to change into a new hat or switch to a sibling */
struct aa_profile *root;
root = PROFILE_IS_HAT(profile) ? profile->parent : profile;
if (PROFILE_IS_HAT(profile))
root = aa_get_profile_rcu(&profile->parent);
else
root = aa_get_profile(profile);
/* find first matching hat */
for (i = 0; i < count && !hat; i++)
@@ -653,6 +656,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
error = -ECHILD;
else
error = -ENOENT;
aa_put_profile(root);
goto out;
}
@@ -667,6 +671,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
/* freed below */
name = new_compound_name(root->base.hname, hats[0]);
aa_put_profile(root);
target = name;
/* released below */
hat = aa_new_null_profile(profile, 1);
@@ -676,6 +681,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
goto audit;
}
} else {
aa_put_profile(root);
target = hat->base.hname;
if (!PROFILE_IS_HAT(hat)) {
info = "target not hat";