Handle cases where capability rights are not provided.

Reported by:	kib

sys/cddl/compat/opensolaris/sys/file.h

@@ -54,7 +54,7 @@ releasef(int fd)
 	struct file *fp;
 
 	/* No CAP_ rights required, as we're only releasing. */
-	if (fget(curthread, fd, 0, &fp) == 0) {
+	if (fget(curthread, fd, NULL, &fp) == 0) {
 		fdrop(fp, curthread);
 		fdrop(fp, curthread);
 	}

sys/dev/aacraid/aacraid_linux.c

@@ -34,6 +34,9 @@ __FBSDID("$FreeBSD$");
  */
 
 #include <sys/param.h>
+#if __FreeBSD_version >= 900000
+#include <sys/capability.h>
+#endif
 #include <sys/systm.h>
 #include <sys/conf.h>
 #include <sys/kernel.h>
@@ -77,15 +80,19 @@ static int
 aacraid_linux_ioctl(struct thread *td, struct linux_ioctl_args *args)
 {
 	struct file *fp;
+#if __FreeBSD_version >= 900000
+	cap_rights_t rights;
+#endif
 	u_long cmd;
 	int error;
 
+	if ((error = fget(td, args->fd,
 #if __FreeBSD_version >= 900000
-	if ((error = fget(td, args->fd, 0, &fp)) != 0)
+	    cap_rights_init(&rights, CAP_IOCTL),
-#else
-	if ((error = fget(td, args->fd, &fp)) != 0)
 #endif
+	    &fp)) != 0) {
 		return (error);
+	}
 	cmd = args->cmd;
 
 	/*

sys/fs/fdescfs/fdesc_vnops.c

@@ -309,7 +309,7 @@ fdesc_lookup(ap)
 	/*
 	 * No rights to check since 'fp' isn't actually used.
 	 */
-	if ((error = fget(td, fd, 0, &fp)) != 0)
+	if ((error = fget(td, fd, NULL, &fp)) != 0)
 		goto bad;
 
 	/* Check if we're looking up ourselves. */

sys/kern/kern_descrip.c

@@ -586,8 +586,8 @@ kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
 
 	case F_SETLK:
 	do_setlk:
-		error = fget_unlocked(fdp, fd,
+		cap_rights_init(&rights, CAP_FLOCK);
-		    cap_rights_init(&rights, CAP_FLOCK), 0, &fp, NULL);
+		error = fget_unlocked(fdp, fd, &rights, 0, &fp, NULL);
 		if (error != 0)
 			break;
 		if (fp->f_type != DTYPE_VNODE) {
@@ -676,7 +676,7 @@ kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
 		 * that the closing thread was a bit slower and that the
 		 * advisory lock succeeded before the close.
 		 */
-		error = fget_unlocked(fdp, fd, 0, 0, &fp2, NULL);
+		error = fget_unlocked(fdp, fd, &rights, 0, &fp2, NULL);
 		if (error != 0) {
 			fdrop(fp, td);
 			break;
@@ -733,7 +733,7 @@ kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
 		arg = arg ? 128 * 1024: 0;
 		/* FALLTHROUGH */
 	case F_READAHEAD:
-		error = fget_unlocked(fdp, fd, 0, 0, &fp, NULL);
+		error = fget_unlocked(fdp, fd, NULL, 0, &fp, NULL);
 		if (error != 0)
 			break;
 		if (fp->f_type != DTYPE_VNODE) {
@@ -2324,13 +2324,15 @@ fget_unlocked(struct filedesc *fdp, int fd, cap_rights_t *needrightsp,
 			return (EBADF);
 #ifdef CAPABILITIES
 		haverights = *cap_rights(fdp, fd);
-		error = cap_check(&haverights, needrightsp);
+		if (needrightsp != NULL) {
-		if (error != 0)
+			error = cap_check(&haverights, needrightsp);
-			return (error);
-		if (cap_rights_is_set(needrightsp, CAP_FCNTL)) {
-			error = cap_fcntl_check(fdp, fd, needfcntl);
 			if (error != 0)
 				return (error);
+			if (cap_rights_is_set(needrightsp, CAP_FCNTL)) {
+				error = cap_fcntl_check(fdp, fd, needfcntl);
+				if (error != 0)
+					return (error);
+			}
 		}
 #endif
 		count = fp->f_count;
@@ -2382,7 +2384,10 @@ _fget(struct thread *td, int fd, struct file **fpp, int flags,
 	*fpp = NULL;
 	if (td == NULL || (fdp = td->td_proc->p_fd) == NULL)
 		return (EBADF);
-	needrights = *needrightsp;
+	if (needrightsp != NULL)
+		needrights = *needrightsp;
+	else
+		cap_rights_init(&needrights);
 	if (maxprotp != NULL)
 		cap_rights_set(&needrights, CAP_MMAP);
 	error = fget_unlocked(fdp, fd, &needrights, 0, &fp, &haverights);
@@ -2517,9 +2522,11 @@ fgetvp_rights(struct thread *td, int fd, cap_rights_t *needrightsp,
 		return (EBADF);
 
 #ifdef CAPABILITIES
-	error = cap_check(cap_rights(fdp, fd), needrightsp);
+	if (needrightsp != NULL) {
-	if (error != 0)
+		error = cap_check(cap_rights(fdp, fd), needrightsp);
-		return (error);
+		if (error != 0)
+			return (error);
+	}
 #endif
 
 	if (fp->f_vnode == NULL)

sys/ofed/include/linux/file.h

@@ -47,8 +47,10 @@ linux_fget(unsigned int fd)
 {
 	struct file *file;
 
-	if (fget_unlocked(curthread->td_proc->p_fd, fd, 0, 0, &file, NULL) != 0)
+	if (fget_unlocked(curthread->td_proc->p_fd, fd, NULL, 0, &file,
+	    NULL) != 0) {
 		return (NULL);
+	}
 	return (struct linux_file *)file->f_data;
 }
 
@@ -70,8 +72,10 @@ put_unused_fd(unsigned int fd)
 {
 	struct file *file;
 
-	if (fget_unlocked(curthread->td_proc->p_fd, fd, 0, 0, &file, NULL) != 0)
+	if (fget_unlocked(curthread->td_proc->p_fd, fd, NULL, 0, &file,
+	    NULL) != 0) {
 		return;
+	}
 	fdclose(curthread->td_proc->p_fd, file, fd, curthread);
 }
 
@@ -80,8 +84,10 @@ fd_install(unsigned int fd, struct linux_file *filp)
 {
 	struct file *file;
 
-	if (fget_unlocked(curthread->td_proc->p_fd, fd, 0, 0, &file, NULL) != 0)
+	if (fget_unlocked(curthread->td_proc->p_fd, fd, NULL, 0, &file,
+	    NULL) != 0) {
 		file = NULL;
+	}
 	filp->_file = file;
         finit(file, filp->f_mode, DTYPE_DEV, filp, &linuxfileops);
 }

sys/security/audit/audit_bsm_klib.c

@@ -496,7 +496,7 @@ audit_canon_path(struct thread *td, int dirfd, char *path, char *cpath)
 			vhold(cvnp);
 		} else {
 			/* XXX: fgetvp() that vhold()s vnode instead of vref()ing it would be better */
-			error = fgetvp(td, dirfd, 0, &cvnp);
+			error = fgetvp(td, dirfd, NULL, &cvnp);
 			if (error) {
 				cpath[0] = '\0';
 				if (rvnp != NULL)