/// <summary>
/// set r/w/x protection on a portion of memory. rounded to encompassing pages
/// </summary>
public override void Protect(ulong start, ulong length, Protection prot)
{
if (length == 0)
{
return;
}
int pstart = GetPage(start);
int pend = GetPage(start + length - 1);
var p = GetMemoryProtectionValue(prot);
for (int i = pstart; i <= pend; i++)
{
_pageData[i] = prot; // also store the value for later use
}
if (Active) // it's legal to Protect() if we're not active; the information is just saved for the next activation
{
var computedStart = WaterboxUtils.AlignDown(start);
var computedEnd = WaterboxUtils.AlignUp(start + length);
var computedLength = computedEnd - computedStart;
if (mprotect(Z.US(computedStart), Z.UU(computedLength), p) != 0)
{
throw new InvalidOperationException("mprotect() returned -1!");
}
}
}
/// <summary>
/// set r/w/x protection on a portion of memory. rounded to encompassing pages
/// </summary>
public void Protect(ulong start, ulong length, Protection prot)
{
if (length == 0)
{
return;
}
int pstart = GetPage(start);
int pend = GetPage(start + length - 1);
var p = GetKernelMemoryProtectionValue(prot);
for (int i = pstart; i <= pend; i++)
{
_pageData[i] = prot; // also store the value for later use
}
if (Active) // it's legal to Protect() if we're not active; the information is just saved for the next activation
{
var computedStart = WaterboxUtils.AlignDown(start);
var computedEnd = WaterboxUtils.AlignUp(start + length);
var computedLength = computedEnd - computedStart;
Kernel32.MemoryProtection old;
if (!Kernel32.VirtualProtect(Z.UU(computedStart),
Z.UU(computedLength), p, out old))
{
throw new InvalidOperationException($"{nameof(Kernel32.VirtualProtect)}() returned FALSE!");
}
}
}
/// <exception cref="InvalidOperationException">failed to protect memory</exception>
public override void Protect(ulong start, ulong length, Protection prot)
{
if (length == 0)
{
return;
}
var pstart = GetPage(start);
var pend = GetPage(start + length - 1);
for (var i = pstart; i <= pend; i++)
{
_pageData[i] = prot; // also store the value for later use
}
if (!Active)
{
return; // it's legal to call this method if we're not active; the information is just saved for the next activation
}
var computedStart = WaterboxUtils.AlignDown(start);
var protEnum = prot.ToMemoryProtection();
var exitCode = mprotect(
Z.US(computedStart),
Z.UU(WaterboxUtils.AlignUp(start + length) - computedStart),
protEnum
);
if (exitCode != 0)
{
throw new InvalidOperationException($"{nameof(mprotect)}() returned {exitCode}!");
}
}
