[Qemu-devel] qemu allows code execution on the stack, even if the quest operating system makes the stack nonexecutable

[joro 42]

tested openwall linux and openbsd 3.5 under qemu.
both of them claim to make the stack non executable when on real x86.

but under qemu, code on the stack seems executed on owl and obsd3.5.

try the following program:

===========
void main()
{
        char trap[]="\xcc"; // "\xeb\xfe" for loop
        void (*f)();
        f=trap;
        f();
}
===========

it executes code instead of SEGV on openwall/openbsd.

/j


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