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unix: fix Getdirentries on 32-bit freebsd 12

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On freebsd 12, the system call for getdirentries writes 64 bits to
*basep, even on 32-bit systems. Accomodate that by providing a uint64
to the system call and copy the base to/from that uint64.
The uint64 seems to be a virtual file offset, so failing if the high
bits are not zero should be fine for reasonable-sized directories.

Update golang/go#32498

Change-Id: I4451894aff4e353c9f009c06ad2fdd5578dfd9f8
Reviewed-on: https://go-review.googlesource.com/c/sys/+/181500
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
This commit is contained in:
Keith Randall
2019-06-10 20:04:19 +00:00
committed by Keith Randall
parent 1e42afee0f
commit 93c9922d18
5 changed files with 20 additions and 6 deletions
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unix/zsyscall_freebsd_amd64.go
+1 -1
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@@ -1019,7 +1019,7 @@ func getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func getdirentries_freebsd12(fd int, buf []byte, basep *uintptr) (n int, err error) {
func getdirentries_freebsd12(fd int, buf []byte, basep *uint64) (n int, err error) {
var _p0 unsafe.Pointer
if len(buf) > 0 {
_p0 = unsafe.Pointer(&buf[0])