Ok

These stuff are very fun to play with. Inject some code, store some binary in stack, put it on X perm region and jump there etc... 😄😄😄

lul

Can I use mmap() to allocate just 4 KB of memory anywhere instead of a predefined adress?

I don't care where it gets allocated as long as it returns a pointer 😅

Bro, any ideas for projects on C++ for advance level .. I'm in first year.. and already done few projects that I got on school days .. please suggest me some good things which I can work on..!

Thanks in advance.

calculatoooor

calculatoooor

??

calculator

calculator

Why that??

its a project

Can I use mmap() to allocate just 4 KB of memory anywhere instead of a predefined adress?

Of course. You don't (and usually can't) specidy address. Use new keyword on C++ btw.

its a project

Elaborate it.. in what way you think it's going to test ones potential..

Of course. You don't (and usually can't) specidy address. Use new keyword on C++ btw.

Can you give me an example?

Elaborate it.. in what way you think it's going to test ones potential..

do it yourself

I don't care where it gets allocated as long as it returns a pointer 😅

Everything has a pointer then, try auto* ptr = &var; It will create a new pointer, pointing to address of var.

do it yourself

Just asking.

Everything has a pointer then, try auto* ptr = &var; It will create a new pointer, pointing to address of var.

Can I create a variable at a size of 4 KB?

Just asking.

just answering

Can I create a variable at a size of 4 KB?

yes, you can

Can I create a variable at a size of 4 KB?

Wasn't it int var[40000]?

Just asking.

this is an example

Can you give me an example?

char* buffer = new char[256];

this is an example

Okay.. thanks..

char* buffer = new char[256];

Ah, thank you.

Ah, thank you.

You're welcome. But! Don't forget to delete[] buffer after you've done with it.

You're welcome. But! Don't forget to delete[] buffer after you've done with it.

Yeah

Everything has a pointer then, try auto* ptr = &var; It will create a new pointer, pointing to address of var.

bufferoverflow.cpp:15:8: error: conflicting declaration ‘auto* ptr’ 🤔?

You usually create a class and implement constructor and destructors to handle dynamic memory. Apply RAII!

Otherwise it would be heck called memory leakage..

You're welcome. But! Don't forget to delete[] buffer after you've done with it.

Ah, yes, sure

You usually create a class and implement constructor and destructors to handle dynamic memory. Apply RAII!

That will be on my todo for version 2 👌

Ah, thank you.

the other way, you can also use calloc or malloc

bufferoverflow.cpp:15:8: error: conflicting declaration ‘auto* ptr’ 🤔?

I gave an example, adapt to your needs. You may have declared a var with name ptr...

the other way, you can also use calloc or malloc

His solution is better as I can just delete[] it

the other way, you can also use calloc or malloc

Yeah, but why bother C when you can use C++?

I gave an example, adapt to your needs. You may have declared a var with name ptr...

Oh, thank you for the hint 😅

char* buffer = new char[256];

And these are 2 KB?

Ah, because a character has a size of 4? 🤔

His solution is better as I can just delete[] it

Intresting little fact: (It's impl-defined but) When you use new[] most compilers write size of alloc'd buffer just before alloc'd memory. Because it needs to know how many bytes to release when delete[]'d.

Ah.

And these are 2 KB?

No, it's 256 bytes. Size of a 2KB buffer would be 2048.

Okay.

No, it's 256 bytes. Size of a 2KB buffer would be 2048.

Wait, can I move my pointer out of such variable? Would be great if I couldn't 😅 That would reduce problems in case of broken brainfuck code.

Wait, can I move my pointer out of such variable? Would be great if I couldn't 😅 That would reduce problems in case of broken brainfuck code.

What? A pointer is just an unsigned long with special syntax treatment and a special purpose.

1 byte = unsigned char

1 byte = unsigned char

Ah, okay. Signed means like utf-8 stuff, right?

Ah, okay. Signed means like utf-8 stuff, right?

you can refer to data types in C++

Ah, okay. Signed means like utf-8 stuff, right?

No

No, signed means left-most bit reserved to indicate signedness

uft-8 is unicode format

No, signed means left-most bit reserved to indicate signedness

Ah. Okay what is signedness?

Ah. Okay what is signedness?

unsigned

🤔 you confuse me

Ah, okay. Signed means like utf-8 stuff, right?

Unsigned there neans that "I won't store negative numbers, so that you can use all bits to represent a positive int".

Aaah. Okay.

🤔 you confuse me

Read bit more about data types in C/C++. 😅

example : signed char (char) : the range from : -128 to 127 the unsigned char : range from : 0 to 255

Aaah. Okay.

Remember that you have finite resorces.

Remember that you have finite resorces.

Sometimes I wish having infinite 😅

Sometimes I wish having infinite 😅

it can if hardware can adapt

it can if hardware can adapt

How?

Can you give me an example? XD

Sometimes I wish having infinite 😅

We always do... 😄

if you want to extend memory, you need upgrade size of RAM. If you want to upgrade RAM, you must upgrade hardware to have more registers and logic gates, more logic gates need more transistors and resistors, ...

if you want to extend memory, you need upgrade size of RAM. If you want to upgrade RAM, you must upgrade hardware to have more registers and logic gates, more logic gates need more transistors and resistors, ...

That is not infinite. We have limited ressources to build such stuff

Even though the limit is near infinite but it is finite

How?

He's joking, look at his profile... That face tells a lot! 😄😄😄😄

He's joking, look at his profile... That face tells a lot! 😄😄😄😄

Okay xD

Even though the limit is near infinite but it is finite

C'mon, we don't have infinite resources on the world. Enough off-topic btw.

Hello

Yeah.

Hello

Hi

You may get warn'd, read rules.

Hi

Sup?

He's joking, look at his profile... That face tells a lot! 😄😄😄😄

that's just a little information in lower layer😅

😄😄😄😄

Wanna lear c

Any book?