Accessing stack from heap.Why is this UnSafe?

[Manivannan.P]

Hi,

Accessing a block of memory in stack from Heap or viceversa,
is said to be unsafe and a potential security threat.

Please calrify why is this so.

ThankYou.

[Nick Hounsome]

"Manivannan.P" <Ma**********@discussions.microsoft.com> wrote in message
news:A0**********************************@microsof t.com...

Hi,

Accessing a block of memory in stack from Heap or viceversa,
is said to be unsafe and a potential security threat.

Please calrify why is this so.

ThankYou.

The stack and things in the heap (unless pinned) can be moved by GC to
compact memory.

[Mattias Sjögren]

>The stack and things in the heap (unless pinned) can be moved by GC to

compact memory.

The stack(s) itself isn't affected by GC so it will not move.

It's unsafe because direct manipulation of the stack opens up the risk
of buffer overrun/underrun security bugs and lets you violate type
safety.
Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Willy Denoyette [MVP]]

"Manivannan.P" <Ma**********@discussions.microsoft.com> wrote in message
news:A0**********************************@microsof t.com...
| Hi,
|
| Accessing a block of memory in stack from Heap or viceversa,
| is said to be unsafe and a potential security threat.
|
| Please calrify why is this so.
|
| ThankYou.

What exactly do you mean by "Accessing a block ... from Heap..."? Need some
more context here....

Willy.