Currently, Recvmsg may access the rsa buffer even if the underlying syscall
returns an error.

This change aligns Recvmsg with the safer logic already
used in RecvmsgBuffers, ensuring the address is only processed when
the syscall succeeds (err == nil).

Fixes golang/go#76848

Change-Id: If76477d0362b802e54ee6d27d0e8f57024a8a1dc
Reviewed-on: https://go-review.googlesource.com/c/sys/+/734740
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Florian Lehner <lehner.florian86@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

Currently, only solaris provides IoctlSetString. However, it might be
useful on other platforms too, e.g. for SIOCBRADDBR on linux.

Change-Id: I19ed47a3e4ed0180ba6777bc193e32bfb61c0506
Reviewed-on: https://go-review.googlesource.com/c/sys/+/720200
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Florian Lehner <lehner.florian86@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

For golang/go#76791

Change-Id: I1594c4868262c78d40e1ebd883a01a71236e4981
Reviewed-on: https://go-review.googlesource.com/c/sys/+/740500
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

For golang/go#76791

Change-Id: I9500b38b17b5e3e141df8770d82c725c2ba8fd65
Cq-Include-Trybots: luci.golang.try:x_sys-gotip-windows-arm64
Reviewed-on: https://go-review.googlesource.com/c/sys/+/740880
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>