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apparmor: make signal label match work when matching stacked labels
Given a label with a profile stack of A//&B or A//&C ... A ptrace rule should be able to specify a generic trace pattern with a rule like signal send A//&**, however this is failing because while the correct label match routine is called, it is being done post label decomposition so it is always being done against a profile instead of the stacked label. To fix this refactor the cross check to pass the full peer label in to the label_match. Signed-off-by: John Johansen <john.johansen@canonical.com>
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@ -184,50 +184,34 @@ static void audit_signal_cb(struct audit_buffer *ab, void *va)
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FLAGS_NONE, GFP_ATOMIC);
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}
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/* TODO: update to handle compound name&name2, conditionals */
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static void profile_match_signal(struct aa_profile *profile, const char *label,
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int signal, struct aa_perms *perms)
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{
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unsigned int state;
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/* TODO: secondary cache check <profile, profile, perm> */
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state = aa_dfa_next(profile->policy.dfa,
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profile->policy.start[AA_CLASS_SIGNAL],
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signal);
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state = aa_dfa_match(profile->policy.dfa, state, label);
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aa_compute_perms(profile->policy.dfa, state, perms);
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}
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static int profile_signal_perm(struct aa_profile *profile,
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struct aa_profile *peer, u32 request,
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struct aa_label *peer, u32 request,
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struct common_audit_data *sa)
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{
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struct aa_perms perms;
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unsigned int state;
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if (profile_unconfined(profile) ||
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!PROFILE_MEDIATES(profile, AA_CLASS_SIGNAL))
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return 0;
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aad(sa)->peer = &peer->label;
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profile_match_signal(profile, peer->base.hname, aad(sa)->signal,
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&perms);
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aad(sa)->peer = peer;
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/* TODO: secondary cache check <profile, profile, perm> */
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state = aa_dfa_next(profile->policy.dfa,
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profile->policy.start[AA_CLASS_SIGNAL],
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aad(sa)->signal);
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aa_label_match(profile, peer, state, false, request, &perms);
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aa_apply_modes_to_perms(profile, &perms);
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return aa_check_perms(profile, &perms, request, sa, audit_signal_cb);
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}
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static int aa_signal_cross_perm(struct aa_profile *sender,
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struct aa_profile *target,
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struct common_audit_data *sa)
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{
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return xcheck(profile_signal_perm(sender, target, MAY_WRITE, sa),
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profile_signal_perm(target, sender, MAY_READ, sa));
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}
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int aa_may_signal(struct aa_label *sender, struct aa_label *target, int sig)
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{
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struct aa_profile *profile;
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DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SIGNAL);
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aad(&sa)->signal = map_signal_num(sig);
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return xcheck_labels_profiles(sender, target, aa_signal_cross_perm,
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&sa);
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return xcheck_labels(sender, target, profile,
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profile_signal_perm(profile, target, MAY_WRITE, &sa),
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profile_signal_perm(profile, sender, MAY_READ, &sa));
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}
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