void aa_compute_perms(struct aa_dfa *dfa, unsigned int state,
struct aa_perms *perms)
{
perms->deny = 0;
perms->kill = perms->stop = 0;
perms->complain = perms->cond = 0;
perms->hide = 0;
perms->prompt = 0;
perms->allow = dfa_user_allow(dfa, state);
perms->audit = dfa_user_audit(dfa, state);
perms->quiet = dfa_user_quiet(dfa, state);
/* for v5 perm mapping in the policydb, the other set is used
* to extend the general perm set
*/
perms->allow |= map_other(dfa_other_allow(dfa, state));
perms->audit |= map_other(dfa_other_audit(dfa, state));
perms->quiet |= map_other(dfa_other_quiet(dfa, state));
// perms->xindex = dfa_user_xindex(dfa, state);
}
/**
* compute_mnt_perms - compute mount permission associated with @state
* @dfa: dfa to match against (NOT NULL)
* @state: state match finished in
*
* Returns: mount permissions
*/
static struct aa_perms compute_mnt_perms(struct aa_dfa *dfa,
unsigned int state)
{
struct aa_perms perms = {
.allow = dfa_user_allow(dfa, state),
.audit = dfa_user_audit(dfa, state),
.quiet = dfa_user_quiet(dfa, state),
.xindex = dfa_user_xindex(dfa, state),
};
return perms;
}
static const char * const mnt_info_table[] = {
"match succeeded",
"failed mntpnt match",
"failed srcname match",
"failed type match",
"failed flags match",
"failed data match"
};
/*
* Returns 0 on success else element that match failed in, this is the
* index into the mnt_info_table above
*/
static int do_match_mnt(struct aa_dfa *dfa, unsigned int start,
const char *mntpnt, const char *devname,
const char *type, unsigned long flags,
void *data, bool binary, struct aa_perms *perms)
{
unsigned int state;
AA_BUG(!dfa);
AA_BUG(!perms);
state = aa_dfa_match(dfa, start, mntpnt);
state = aa_dfa_null_transition(dfa, state);
if (!state)
return 1;
if (devname)
state = aa_dfa_match(dfa, state, devname);
state = aa_dfa_null_transition(dfa, state);
if (!state)
return 2;
if (type)
state = aa_dfa_match(dfa, state, type);
state = aa_dfa_null_transition(dfa, state);
if (!state)
return 3;
state = match_mnt_flags(dfa, state, flags);
if (!state)
return 4;
*perms = compute_mnt_perms(dfa, state);
if (perms->allow & AA_MAY_MOUNT)
return 0;
/* only match data if not binary and the DFA flags data is expected */
if (data && !binary && (perms->allow & AA_MNT_CONT_MATCH)) {
state = aa_dfa_null_transition(dfa, state);
if (!state)
return 4;
state = aa_dfa_match(dfa, state, data);
if (!state)
return 5;
*perms = compute_mnt_perms(dfa, state);
if (perms->allow & AA_MAY_MOUNT)
return 0;
}
/* failed at end of flags match */
return 4;
}
