bsd/kern/posix_shm.c

156 	struct pshminfo *pinfo;
181 static int pshm_close(struct pshminfo *pinfo, int dropref);
186 int pshm_access(struct pshminfo *pinfo, int mode, kauth_cred_t cred, proc_t p);
372 	struct pshminfo *pinfo;
389 	pinfo = PSHMINFO_NULL;
483 	error = pshm_cache_search(&pinfo, &nd, &pcache, 1);
496 			pinfo = new_pinfo;
497 			pinfo->pshm_flags = PSHM_DEFINED | PSHM_INCREATE;
498 			pinfo->pshm_usecount = 1; /* existence reference */
499 			pinfo->pshm_mode = cmode;
500 			pinfo->pshm_uid = kauth_getuid();
501 			pinfo->pshm_gid = kauth_getgid();
502 			bcopy(pnbuf, &pinfo->pshm_name[0], pathlen);
503 			pinfo->pshm_name[pathlen]=0;
509 			mac_posixshm_label_associate(kauth_cred_get(), pinfo, nameptr);
517 				AUDIT_ARG(posix_ipc_perm, pinfo->pshm_uid,
518 						pinfo->pshm_gid,
519 						pinfo->pshm_mode);
526 			if( pinfo->pshm_flags & PSHM_INDELETE) {
530 			AUDIT_ARG(posix_ipc_perm, pinfo->pshm_uid,
531 					pinfo->pshm_gid, pinfo->pshm_mode);
533 			if ((error = mac_posixshm_check_open(kauth_cred_get(), pinfo, fmode))) {
537 			if ( (error = pshm_access(pinfo, fmode, kauth_cred_get(), p)) ) {
548 		if( pinfo->pshm_flags & PSHM_INDELETE) {
553 		if ((error = mac_posixshm_check_open(kauth_cred_get(), pinfo, fmode))) {
558 		if ((error = pshm_access(pinfo, fmode, kauth_cred_get(), p))) {
572 		pinfo->pshm_writecount++;
574 		pinfo->pshm_readcount++;
578 		if ( (error = pshm_cache_add(pinfo, &nd, pcp)) ) {
585 		pinfo->pshm_usecount++;
587 	pinfo->pshm_flags &= ~PSHM_INCREATE;
588 	new_pnode->pinfo = pinfo;
631 		pshm_close(pinfo, 1);
660 	struct pshminfo * pinfo;
680 	if ((pinfo = pnode->pinfo) == PSHMINFO_NULL) {
684 	if ((pinfo->pshm_flags & (PSHM_DEFINED|PSHM_ALLOCATING|PSHM_ALLOCATED))
690 	error = mac_posixshm_check_truncate(kauth_cred_get(), pinfo, length);
697 	pinfo->pshm_flags |= PSHM_ALLOCATING;
699 	pshmobj_next_p = &pinfo->pshm_memobjects;
738 	pinfo->pshm_flags = PSHM_ALLOCATED;
739 	pinfo->pshm_length = total_size;
745 	for (pshmobj = pinfo->pshm_memobjects;
752 	pinfo->pshm_memobjects = NULL;
753 	pinfo->pshm_flags &= ~PSHM_ALLOCATING;
773 	struct pshminfo *pinfo;
779 	if ((pinfo = pnode->pinfo) == PSHMINFO_NULL){
785 	error = mac_posixshm_check_stat(kauth_cred_get(), pinfo);
795 		sb64->st_mode = pinfo->pshm_mode;
796 		sb64->st_uid = pinfo->pshm_uid;
797 		sb64->st_gid = pinfo->pshm_gid;
798 		sb64->st_size = pinfo->pshm_length;
802 		sb->st_mode = pinfo->pshm_mode;
803 		sb->st_uid = pinfo->pshm_uid;
804 		sb->st_gid = pinfo->pshm_gid;
805 		sb->st_size = pinfo->pshm_length;
817 pshm_access(struct pshminfo *pinfo, int mode, kauth_cred_t cred, __unused proc_t p)
826 	return(posix_cred_access(cred, pinfo->pshm_uid, pinfo->pshm_gid, pinfo->pshm_mode, mode_req));
844 	struct pshminfo * pinfo;
866 	if ((pinfo = pnode->pinfo) == PSHMINFO_NULL) {
871 	if ((pinfo->pshm_flags & PSHM_ALLOCATED) != PSHM_ALLOCATED) {
875 	if ((off_t)user_size > pinfo->pshm_length) {
879 	if ((off_t)(user_size + file_pos) > pinfo->pshm_length) {
883 	if ((pshmobj = pinfo->pshm_memobjects) == NULL) {
889 	error = mac_posixshm_check_mmap(kauth_cred_get(), pinfo, prot, flags);
935 	for (map_pos = 0, pshmobj = pinfo->pshm_memobjects;
973 	pinfo->pshm_flags |= (PSHM_MAPPED | PSHM_INUSE);
1006 	struct pshminfo *pinfo;
1015 	pinfo = PSHMINFO_NULL;
1058 	error = pshm_cache_search(&pinfo, &nd, &pcache, 0);
1073 	if ((pinfo->pshm_flags & (PSHM_DEFINED | PSHM_ALLOCATED))==0) {
1079 	if (pinfo->pshm_flags & PSHM_ALLOCATING) {
1086 	if (pinfo->pshm_flags & PSHM_INDELETE) {
1092 	error = mac_posixshm_check_unlink(kauth_cred_get(), pinfo, nameptr);
1099 	AUDIT_ARG(posix_ipc_perm, pinfo->pshm_uid, pinfo->pshm_gid,
1100 		  pinfo->pshm_mode);
1106 	if ( (error = pshm_access(pinfo, FWRITE, kauth_cred_get(), p)) ) {
1111 	pinfo->pshm_flags |= PSHM_INDELETE;
1113 	pinfo->pshm_flags |= PSHM_REMOVED;
1115  	if (!--pinfo->pshm_usecount) {
1117 		mac_posixshm_label_destroy(pinfo);
1127 		for (pshmobj = pinfo->pshm_memobjects;
1134 		FREE(pinfo,M_SHM);
1147 pshm_close(struct pshminfo *pinfo, int dropref)
1156 	if ( !dropref && ((pinfo->pshm_flags & PSHM_ALLOCATED) != PSHM_ALLOCATED)) {
1160 	if(!pinfo->pshm_usecount) {
1164 	pinfo->pshm_usecount--; /* release this fd's reference */
1166  	if ((pinfo->pshm_flags & PSHM_REMOVED) && !pinfo->pshm_usecount) {
1168 		mac_posixshm_label_destroy(pinfo);
1175 		for (pshmobj = pinfo->pshm_memobjects;
1183 		FREE(pinfo,M_SHM);
1198 		if (pnode->pinfo != PSHMINFO_NULL) {
1199 			error =  pshm_close(pnode->pinfo, 0);
1247 	struct pshminfo *pinfo;
1251 	if ((pinfo = pshm->pinfo) == PSHMINFO_NULL){
1259 	sb->vst_mode = pinfo->pshm_mode;
1260 	sb->vst_uid = pinfo->pshm_uid;
1261 	sb->vst_gid = pinfo->pshm_gid;
1262 	sb->vst_size = pinfo->pshm_length;
1265 	bcopy(&pinfo->pshm_name[0], &info->pshm_name[0], PSHMNAMLEN+1);
1281 		pshm = pnode->pinfo;