summaryrefslogtreecommitdiffstats
path: root/security/apparmor/ipc.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--security/apparmor/ipc.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/security/apparmor/ipc.c b/security/apparmor/ipc.c
new file mode 100644
index 000000000..3dbbc59d4
--- /dev/null
+++ b/security/apparmor/ipc.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor ipc mediation
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2017 Canonical Ltd.
+ */
+
+#include <linux/gfp.h>
+
+#include "include/audit.h"
+#include "include/capability.h"
+#include "include/cred.h"
+#include "include/policy.h"
+#include "include/ipc.h"
+#include "include/sig_names.h"
+
+
+static inline int map_signal_num(int sig)
+{
+ if (sig > SIGRTMAX)
+ return SIGUNKNOWN;
+ else if (sig >= SIGRTMIN)
+ return sig - SIGRTMIN + SIGRT_BASE;
+ else if (sig < MAXMAPPED_SIG)
+ return sig_map[sig];
+ return SIGUNKNOWN;
+}
+
+/**
+ * audit_signal_mask - convert mask to permission string
+ * @mask: permission mask to convert
+ *
+ * Returns: pointer to static string
+ */
+static const char *audit_signal_mask(u32 mask)
+{
+ if (mask & MAY_READ)
+ return "receive";
+ if (mask & MAY_WRITE)
+ return "send";
+ return "";
+}
+
+/**
+ * audit_cb - call back for signal specific audit fields
+ * @ab: audit_buffer (NOT NULL)
+ * @va: audit struct to audit values of (NOT NULL)
+ */
+static void audit_signal_cb(struct audit_buffer *ab, void *va)
+{
+ struct common_audit_data *sa = va;
+
+ if (aad(sa)->request & AA_SIGNAL_PERM_MASK) {
+ audit_log_format(ab, " requested_mask=\"%s\"",
+ audit_signal_mask(aad(sa)->request));
+ if (aad(sa)->denied & AA_SIGNAL_PERM_MASK) {
+ audit_log_format(ab, " denied_mask=\"%s\"",
+ audit_signal_mask(aad(sa)->denied));
+ }
+ }
+ if (aad(sa)->signal == SIGUNKNOWN)
+ audit_log_format(ab, "signal=unknown(%d)",
+ aad(sa)->unmappedsig);
+ else if (aad(sa)->signal < MAXMAPPED_SIGNAME)
+ audit_log_format(ab, " signal=%s", sig_names[aad(sa)->signal]);
+ else
+ audit_log_format(ab, " signal=rtmin+%d",
+ aad(sa)->signal - SIGRT_BASE);
+ audit_log_format(ab, " peer=");
+ aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
+ FLAGS_NONE, GFP_ATOMIC);
+}
+
+static int profile_signal_perm(struct aa_profile *profile,
+ struct aa_label *peer, u32 request,
+ struct common_audit_data *sa)
+{
+ struct aa_perms perms;
+ unsigned int state;
+
+ if (profile_unconfined(profile) ||
+ !PROFILE_MEDIATES(profile, AA_CLASS_SIGNAL))
+ return 0;
+
+ aad(sa)->peer = peer;
+ /* TODO: secondary cache check <profile, profile, perm> */
+ state = aa_dfa_next(profile->policy.dfa,
+ profile->policy.start[AA_CLASS_SIGNAL],
+ aad(sa)->signal);
+ aa_label_match(profile, peer, state, false, request, &perms);
+ aa_apply_modes_to_perms(profile, &perms);
+ return aa_check_perms(profile, &perms, request, sa, audit_signal_cb);
+}
+
+int aa_may_signal(struct aa_label *sender, struct aa_label *target, int sig)
+{
+ struct aa_profile *profile;
+ DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SIGNAL);
+
+ aad(&sa)->signal = map_signal_num(sig);
+ aad(&sa)->unmappedsig = sig;
+ return xcheck_labels(sender, target, profile,
+ profile_signal_perm(profile, target, MAY_WRITE, &sa),
+ profile_signal_perm(profile, sender, MAY_READ, &sa));
+}