Syscalls, Kernel vs. User Mode and Linux Kernel Source Code - bin 0x09

We will have a look at what syscalls are and what it has to do with the kernel mode an user mode. We do this by exploring a kernel function and trace it down to the assembler level.

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[xXoSmegZoXx]

It's a shame you have so little views.
I think your videos are awesome!
It's very hard to get into "hacking" or basically understanding how computers really work in a fun way.
I appreciate your effort to make this knowledge easier to acquire.
Thank you!

[dimimate]

Your videos are very good. I have searched and watched many videos on the topic in matter and your work is what exactly i was looking for. Well explained terms, examples with live hands-on-keyboard, short length, references from books used, no sleepy voicing and many more. Your videos are an example of how video tutorials-lectures should be made. Congrats

[figloalds]

I thought Linux kernel was complicated.
Now I'm sure.
Actually it's the simpler it can be, computing is complex and providing a safe reliable bed for applications to run, live and exit is indeed... Magic. Highest rank of Computer Magic.

[Chastor]

Your English is quite clear and easy to understand by non-native English users

[EchoNote]

9:06 "Imagine if a process try to read some secrets from another process". A few days ago (January 2018) the google project zero team discovered a bug that does exactly this (meltdown and spectre) hahahaha

[bitcode_]

im learning a lot from your videos, thanks for taking the time to make them, i appreciate it

[Linaiz]

This is amazing, never seen a video before that actually links all these concepts together, this gave me a totally new point of view on this as a student, thank you!

[themanyone]

This is more my speed. A lot of condensed information in a short time here. Definitely going to have to wake up and drink another cup of coffee before watching it again.

[krzysztofadamski]

This video is very good and you are really good at explaining complex stuff. This of course requires making some simplifications and it's quite easy to make things wrong when you do that. Claiming that the mov instruction inside of __get_user_asm is an example. While this is possible, its not what will usually happen. In most cases the page will be available in the memory (won't be swapped out) and no page fault will be done. As you explained before, resolving virtual addresses is done transparently by MMU, which is reprogrammed each time a process is scheduled.

[j.santana]

alot of this went over my head tbh. It's quite informative, yet quick paced. I'm still new to understanding syscalls. I'm definitely gonna be coming back to this video

[darshannn]

no matter how many times I come back to this playlist, I always learn something new🙌

[guitarscholar]

I love your videos. It is good to dive into topics like this sometimes. It is a taster that makes me want more.

[jitendra.khasdev]

LiveOverflow....I just see your 1st Its awesome :-)

[KeithMakank]

0:50 the funny thing about calling them an interface between things, is that the interface itself must then exist in a domain of its own (otherwise it isn't an "interface" but part of one "face" inside another - difference is crucial), of course being again either user or kernel land. In reality syscall implementation always exists in both of course.

[ajaysureshkumar]

One of the best playlists for hackers...And the best playlist for reverse engineering!!!
And I am sad that this playlists have less views than the other stupid hack vdos..where most of them are fake ones ..And most of them are like making use of tools which contributes 0% to computer knowledge which are making backdoor and getting control of data..Hacking is something far than channel teaches us the real skills required for hacking like knowing the inner working of computer and how do they process data and how can you trick the computer.. Most channel teaches us how to do it..But this channel teaches how to do it and why did this happen..And huge respects to this man who did this vdos free for us to watch .May ur channel grows exponentially over time..And really sorry bcoz of posting the comment after u have asked the feedback ..Ur teaching is really great dude.And pls make a new playlist for web application penetration testing by starting from sql injection to advanced web application attacks ..Pls sir ur teaching is really gud ..And btw i am a great fan of ur vlogs

[DurgaPrasad]

you are amazing!. this compliment is not for what i learn from your videos. it is for your way of explanation. because, even some topics i don't understand my temptation doesn't stop me that not see your videos. #LiveOverflow is one of the best channel i am following thank you.

[graysoncroom]

Great series so far. You are the first person I have found that goes deep enough to make me think, but not to the point of confusion. I appreciate what you are doing, keep up the good work!

[shravankumarsheri]

watched 2 times to get the grasp of it. Man it was really profound amount of knowledge.

[kltfcgsdawe]

nice, but you wrong at 11:57 there will be no page fault ( only happen on special cases like addresses not belong to the process address space or swapped ) kernel will be mapped across all processes ( but protected from access ) so kernel can access process memory just by VA and MMU will convert to PA as usual

[alkeryn]

first time i watched this video few month ago i didn't quite understood everything
learnt assembly recently and now i'm like "bruh its the basics"
but thanks anyway you made few things more clear