diff options
| -rw-r--r-- | security/selinux/ss/services.c | 43 |
1 files changed, 39 insertions, 4 deletions
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index 0e5c3a422a8..cf27b3ee1a9 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -525,14 +525,16 @@ static void type_attribute_bounds_av(struct context *scontext, u16 tclass, struct av_decision *avd) { + struct context lo_scontext; + struct context lo_tcontext; + struct av_decision lo_avd; struct type_datum *source = policydb.type_val_to_struct[scontext->type - 1]; + struct type_datum *target + = policydb.type_val_to_struct[tcontext->type - 1]; + u32 masked = 0; if (source->bounds) { - struct context lo_scontext; - struct av_decision lo_avd; - u32 masked; - memset(&lo_avd, 0, sizeof(lo_avd)); memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); @@ -545,7 +547,40 @@ static void type_attribute_bounds_av(struct context *scontext, if ((lo_avd.allowed & avd->allowed) == avd->allowed) return; /* no masked permission */ masked = ~lo_avd.allowed & avd->allowed; + } + + if (target->bounds) { + memset(&lo_avd, 0, sizeof(lo_avd)); + + memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); + lo_tcontext.type = target->bounds; + + context_struct_compute_av(scontext, + &lo_tcontext, + tclass, + &lo_avd); + if ((lo_avd.allowed & avd->allowed) == avd->allowed) + return; /* no masked permission */ + masked = ~lo_avd.allowed & avd->allowed; + } + + if (source->bounds && target->bounds) { + memset(&lo_avd, 0, sizeof(lo_avd)); + /* + * lo_scontext and lo_tcontext are already + * set up. + */ + + context_struct_compute_av(&lo_scontext, + &lo_tcontext, + tclass, + &lo_avd); + if ((lo_avd.allowed & avd->allowed) == avd->allowed) + return; /* no masked permission */ + masked = ~lo_avd.allowed & avd->allowed; + } + if (masked) { /* mask violated permissions */ avd->allowed &= ~masked; |