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- // 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));
- }
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