Determine readlink result whether should be validated or not

[jozkee]

From @pedrobsaila #72258 (comment):

libraries\Common\src\System\Net\NetworkInformation\UnixCommandLinePing.cs : I validate result because ping executable should be check (ex: file exists) before it can be used as a command line

runtime/src/libraries/Common/src/System/Net/NetworkInformation/UnixCommandLinePing.cs

Lines 39 to 49 in 953fd35

	private static bool IsBusyboxPing(string? pingBinary)
	{
	if (pingBinary != null)
	{
	string? linkedName = Interop.Sys.ReadLink(pingBinary);
	// If pingBinary is not link linkedName will be null
	if (linkedName != null && linkedName.EndsWith("busybox", StringComparison.Ordinal))
	{
	return true;
	}

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Issue Details

---

From @pedrobsaila #72258 (comment):

libraries\Common\src\System\Net\NetworkInformation\UnixCommandLinePing.cs : I validate result because ping executable should be check (ex: file exists) before it can be used as a command line

runtime/src/libraries/Common/src/System/Net/NetworkInformation/UnixCommandLinePing.cs

Lines 39 to 49 in 953fd35

	private static bool IsBusyboxPing(string? pingBinary)
	{
	if (pingBinary != null)
	{
	string? linkedName = Interop.Sys.ReadLink(pingBinary);
	// If pingBinary is not link linkedName will be null
	if (linkedName != null && linkedName.EndsWith("busybox", StringComparison.Ordinal))
	{
	return true;
	}

Author:	Jozkee
Assignees:	-
Labels:	area-System.Net, untriaged
Milestone:	-

[CarnaViire]

Triage: We should fix it in 8.0