jaildesc: replace EBADF with EINVAL

Following fd9e09cb, EBADF is not the suitable error code for a non-
jail descriptor passed to jail_set, jail_get, jail_attach_fd, and
jail_remove_fd.

Reported by:	kib

2 files changed, 7 insertions, 21 deletions

diff --git a/lib/libsys/jail.2 b/lib/libsys/jail.2
index a0f47cc61cb3..a2640071d1f0 100644
--- a/lib/libsys/jail.2
+++ b/lib/libsys/jail.2
@@ -23,7 +23,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 4, 2025
+.Dd September 9, 2025
 .Dt JAIL 2
 .Os
 .Sh NAME
@@ -402,15 +402,6 @@ The
 system call
 will fail if:
 .Bl -tag -width Er
-.It Bq Er EBADF
-The
-.Va desc
-parameter does not refer to a valid jail descriptor,
-and either the
-.Dv JAIL_USE_DESC
-or
-.Dv JAIL_AT_DESC
-flag was set.
 .It Bq Er EACCES
 Write permission is denied on the jail descriptor in the
 .Va desc
@@ -514,15 +505,6 @@ The
 system call
 will fail if:
 .Bl -tag -width Er
-.It Bq Er EBADF
-The
-.Va desc
-parameter does not refer to a valid jail descriptor,
-and either the
-.Dv JAIL_USE_DESC
-or
-.Dv JAIL_AT_DESC
-flag was set.
 .It Bq Er EACCES
 Read permission is denied on the jail descriptor in the
 .Va desc
@@ -564,6 +546,10 @@ parameter has been removed
 .It Bq Er EINVAL
 A supplied parameter is the wrong size.
 .It Bq Er EINVAL
+A supplied parameter is out of range.
+.It Bq Er EINVAL
+A supplied string parameter is not null-terminated.
+.It Bq Er EINVAL
 A supplied parameter name does not match any known parameters.
 .It Bq Er EMFILE
 A jail descriptor could not be created for the
@@ -607,7 +593,7 @@ and
 system calls
 will fail if:
 .Bl -tag -width Er
-.It Bq Er EBADF
+.It Bq Er EINVAL
 The
 .Fa fd
 argument is not a valid jail descriptor.
diff --git a/sys/kern/kern_jaildesc.c b/sys/kern/kern_jaildesc.c
index fec9b5719b2e..b4ffad4c88e8 100644
--- a/sys/kern/kern_jaildesc.c
+++ b/sys/kern/kern_jaildesc.c
@@ -87,7 +87,7 @@ jaildesc_find(struct thread *td, int fd, struct jaildesc **jdp,
 	if (error != 0)
 		return (error);
 	if (fp->f_type != DTYPE_JAILDESC) {
-		error = EBADF;
+		error = EINVAL;
 		goto out;
 	}
 	jd = fp->f_data;