IRC Driven

[00:00:33] * antoine49 joined #linux

[00:22:30] * jared joined #linux

[00:43:04] jared Can you hack your own linux computer?

[00:43:44] aaabbb jared: of course, you can do whatever you want with your own computer

[00:44:22] jared Could you show a newbie how

[00:44:57] aaabbb well what do you mean by hack then?

[01:15:56] f lol

[01:16:14] f that's not how hacking works

[01:16:47] aaabbb f: ig someone could practice hacking by installing like an outdated setuid application and explore how to privesc

[01:16:49] f we don't condone anything illegal here either

[01:17:07] aaabbb except j walking

[01:19:35] jared looks like i got some conversation going

[01:26:44] * hippy joined #linux

[01:27:49] heather jared: https://owasp.org/www-project-vulnerable-web-applications-directory/

[01:27:50] nR [IRC-nERDs] <+nerds> [OWASP Vulnerable Web Applications Directory | OWASP Foundation]

[01:27:52] Demon [url] OWASP Vulnerable Web Applications Directory | OWASP Foundation | owasp.org

[01:28:12] heather if you go here they have fun hackable labs for security newbies

[01:28:39] jared thanks

[01:28:56] aaabbb also look up "ctf" sites ("capture the flag")

[01:31:52] heather https://github.com/InsiderPhD/Generic-University

[01:31:53] nR [IRC-nERDs] <+nerds> [GitHub - InsiderPhD/Generic-University: Vulnerable API]

[01:31:54] Demon [url] GitHub - InsiderPhD/Generic-University: Vulnerable API | github.com

[01:31:55] heather lol

[01:37:54] * hippy joined #linux

[01:39:10] * *.freenode.net set mode +ovo DickCheney Demon DarthOreo

[01:39:13] * Netsplit healed 50 users rejoined

Click to toggle user list

schizo HUBI zrubavel egrouse fs2 thelounge41 mrplaydoh starz nibbier oxy Guest5710 Enviosity Smeef PickledEggs Guest778 Thanzex5395 Saphir Epistam ORANGE_MAN_BAD coronavirus Guest2297721 MZx90 alphaspi__ Penguin xcpep demon__ Synergiance wjlafrance Hackerpcs DickCheney `slikts SoulsForBelial sbine robo farooq4 DarthOreo Glorfindel sickprodigy Guest708 akaWolf Guest6172 nick_ jared cgp1 franzer tyladams33 finsternis MysticKnightUK zhongfu Demon

[01:39:15] * Google set mode +v IRCDriven

[01:41:33] * *.freenode.net set mode +ovo DickCheney Demon DarthOreo

[01:41:36] * Netsplit healed 50 users rejoined

Click to toggle user list

coronavirus zrubavel oxy wjlafrance Hackerpcs jared egrouse starz demon__ fs2 xcpep Enviosity mrplaydoh Smeef nibbier cgp1 Guest778 MZx90 franzer Guest708 HUBI schizo DarthOreo Thanzex5395 sickprodigy sbine PickledEggs Synergiance Guest2297721 SoulsForBelial ORANGE_MAN_BAD Epistam alphaspi__ Saphir DickCheney `slikts zhongfu Demon MysticKnightUK finsternis Penguin robo Guest6172 Glorfindel nick_ farooq4 akaWolf thelounge41 Guest5710 tyladams33

[01:41:38] * Google set mode +v IRCDriven

[01:43:22] * MysticKnightUK joined #linux

[01:50:17] * Enviosity joined #linux

[02:15:27] sbine mmmh

[02:18:56] * *.freenode.net set mode +ovo DickCheney Demon DarthOreo

[02:18:59] * Netsplit healed 49 users rejoined

Click to toggle user list

egrouse starz Guest6172 Saphir Guest708 nibbier Smeef DickCheney franzer mrplaydoh Hackerpcs Thanzex5395 finsternis Guest5710 demon__ Synergiance akaWolf ORANGE_MAN_BAD PickledEggs fs2 sickprodigy alphaspi__ zhongfu coronavirus Epistam Enviosity jared zrubavel nick_ `slikts SoulsForBelial tyladams33 thelounge41 MysticKnightUK HUBI wjlafrance Guest2297721 robo xcpep schizo MZx90 DarthOreo Guest778 Glorfindel oxy Demon Penguin cgp1 farooq4

[02:28:14] * *.freenode.net set mode +oovoYo heather nR nR aaabbb [3] [3]

[02:28:14] * *.freenode.net set mode +ooo Google riddle f

[02:28:14] * *.freenode.net set mode +o ComputerTech

[02:28:15] * *.freenode.net set mode +o End3r

[02:28:16] * Netsplit healed 85 users rejoined

Click to toggle user list

Leatherface UserOO7 ShOrTy Tokki dcdc4567 tjbp Manouchehri TheFatherMind madmax FH_thecat G3ngh1s_ stairmast0r wez onesecb jkl Mintle Colpop4323 Coniass Guest22188 ThirdOfSeven Canucktux coumbole lockywolf aaabbb microfracture Doc-Saintly goodlings8 tabakhase heather techspan z3uS Patrick probonic nlo y2k splashd Whiskey seifer BridgeIGN lyri ABBA kabir torebsd thelounge39 sOdAgiRL CompanionCube nR End3r neko afx237 th3r00t^ Guest10480 ScottE unsyncing barnito_ sl4ck3r amalek travelleri nukedclx Stryyker dino82 redsh CrystalMath Hoosilon alphad television Paul riddle Koragg Parabellus Dalius shazzr TW1920 sftp Guest4089 ironbug_znc localhost00 acovrig87295 ComputerTech x-warrior FruitieX dmt gabes5 ColdKeyboard nlsun

[02:28:22] * *.freenode.net set mode +Yoo [3] [3] CrystalMath

[02:28:23] * Netsplit healed 4 users rejoined

Click to toggle user list

CrystalMath [3] Manouchehri deadmorozz

[02:28:25] * Google set mode +v IRCDriven

[02:31:49] * Enviosity joined #linux

[03:07:00] * El joined #linux

[03:30:39] * Coniass joined #linux

[04:04:31] * jared joined #linux

[04:08:32] * Netsplit healed 2 users rejoined

Click to toggle user list

_S4MUR4I_ _S4MUR4I_

[04:19:30] * Haroeris joined #linux

[05:09:30] * SoulsForBelial_ joined #linux

[05:10:16] * sbine joined #linux

[05:15:26] * barnito joined #linux

[05:15:55] * pagz joined #linux

[05:51:08] * Google set mode +v IRCDriven

[06:22:53] * barnito joined #linux

[06:33:11] * antoine49 joined #linux

[07:09:18] * El joined #linux

[07:10:47] * diamond joined #linux

[07:31:08] * suswagatam-rong joined #linux

[07:35:06] * szp joined #linux

[07:38:01] * szp joined #linux

[07:43:09] * szp1 joined #linux

[07:52:48] * szp1 joined #linux

[07:56:01] * lyri joined #linux

[08:17:16] * chchjesus joined #linux

[08:29:00] * davispuh joined #linux

[08:36:21] * web-89 joined #linux

[08:47:23] * Guest228594014463 joined #linux

[09:11:14] * Intruder777 joined #linux

[09:38:02] * RyuwNet joined #linux

[09:40:07] * BADB172 joined #linux

[09:53:35] BADB172 hey! I'm trying to create simple init from scratch, it runs fine but I can only see log messages (printk) from kernel, is it documented somewhere what you have to do to take over the framebuffer console?

[09:54:03] BADB172 I've looked source code of agetty and mingetty and tried to do the same: open /dev/console or /dev/tty1, ioctl with TIOCSCTTY, dup twice and then sys_write to STDOUT_FILENO but there is no visible output

[09:54:40] BADB172 using /dev/fb0 works but even then fbcon still runs on the background, overwriting my graphics with it's blinking cursor - while I could patch fbcon to not do that but obviously that's not how it should work, so what's the official way to "take over the framebuffer console" from userspace?

[09:55:14] BADB172 I apologize if this is a stupid question but I can't find anything with Google and I've wasted so many days trying to get this to work :/

[09:58:53] BADB172 well, "wasted so many days" is a harsh way to put it, this is a fun project for me but being stuck on the same thing for days on end is less fun. if anyone can point me in the right direction I'd appreciate that a lot, thanks!

[10:05:35] aaabbb so i don't know about the framebuffer, but if you are doing this with the drm node, you would need DRM_IOCTL_SET_MASTER

[10:13:44] BADB172 I am testing this out on Raspberry Pi 3B+, I currently have CONFIG_DRM=n because whenever I enable it I get no signal from HDMI after it starts the DRM/KMS driver (I have dtoverlay=vc4-kms-v3d and the correct .dtbo in overlays) and no workarounds from Google have worked (like video=HDMI-A-1:1920x in cmdline)

[10:15:21] BADB172 I really don't know enough about DRM to say if that's the correct behavior and I would need to do something in userspace but I assume it's not because the console should work with DRM too, right? like on my desktop there's i915drmfb which provides necessary things for the framebuffer console to work

[10:15:49] aaabbb you're right and i really only know how to do it with drm, but that's not what you're looking for

[10:22:33] * putolinux joined #linux

[10:23:24] BADB172 I've seen many people say how fbdev/fbcon is really buggy 90s code and full of security issues, at some point there was kmscon but it never became a replacement in mainline. all that sounds like it might not be a good idea to start a new project relying on fbdev, even though I assume it DRM's fbdev emulation is not going to disappear anytime soon? fbcon/CONFIG_VT could become deprecated so maybe it's not a

[10:23:30] BADB172 good idea to depend on those.. is there a good documentation how to do what I want with DRM, why is DRM_IOCTL_SET_MASTER important/what does it do?

[10:25:09] aaabbb CONFIG_VT is horrible

[10:25:15] aaabbb lots of legacy code

[10:25:39] aaabbb DRM_IOCTL_SET_MASTER sets a program as the sole owner of the screen, it is an ioctl passed to /dev/dri/card0

[10:27:19] BADB172 I assume there is a lot of other things to do than just DRM_IOCTL_SET_MASTER or? is the whole process documented somewhere so you don't have to spend the whole day educating me :D

[10:27:48] BADB172 I just want a simple way to draw pixels on the screen without pulling wayland and huge amount of libraries which I think shouldn't be needed for this

[10:29:22] aaabbb it's Xorg that opens /dev/dri/card0 and does set master

[10:29:54] aaabbb then it does a bunch of ioctls that depend on your gpu

[10:29:59] aaabbb various things to set up pixel buffers etc

[10:31:10] * robo joined #linux

[10:31:54] BADB172 oh, I see. ideally I would like to make my code as portable as possible, embedded systems might not have any GPU, just some kind of CPU-based software rendering. would that still work with simpledrm or something like that or is this one of those use cases where framebuffer makes more sense?

[10:32:34] aaabbb a framebuffer is waaaay easier to use than drm

[10:33:03] * Peter joined #linux

[10:37:04] BADB172 yeah, framebuffer sounds like what I want as I don't really need acceleration or good performance, just a portable way to draw text or simple graphics on the screen. do you think I should worry about framebuffer support being removed in the future, because there was a lot of talk about how fbcon, fbdev etc is full of legacy and vulnerable code and should be replaced with something better? maybe it's best

[10:37:10] BADB172 to just use /dev/fb0 and not use any of the stuff in fbcon which provides text rendering with bitmap fonts etc?

[10:38:22] * Netsplit healed 2 users rejoined

Click to toggle user list

AT-x310 Peter

[10:40:54] aaabbb BADB172: it's certainly never gonna be removed

[10:41:18] aaabbb using /dev/fb0 directly is by far the easiest and most universally supported

[10:59:32] * El joined #linux

[11:01:42] BADB172 aaabbb: that's reassuring to hear, thanks! I know you said you can't help with framebuffer but as you're obviously more experienced wrt working with kernel, where should I look to find documentation about this (telling kernel "don't draw console on the screen, I'm doing everything from now on"), this is one of the simplest things one could hope to do so I guess I must be looking at the wrong place

[11:02:07] * Intruder777 left #linux

[11:06:50] aaabbb BADB172: linux has some very extensive and nice documentation that describes exactly how the framebufer works. most of what is printed to the framebuffer by the *kernel* is printk() calls

[11:07:05] aaabbb you can adjust that by changing the loglevel

[11:08:23] aaabbb printk(KERN_INFO, "this message will be printed at loglevel info, also, %d + %d = %d", a, b, a + b);

[11:08:33] aaabbb that kind of thing, in kernel code, will cause the message to be printed to the fb

[11:08:41] aaabbb no matter what you are doing with the fb

[11:08:41] aaabbb 3

[11:08:46] aaabbb (ignore the 3)

[11:10:41] aaabbb basically what it seems like you want is access to the framebuffer *without* a console behind it

[11:10:46] aaabbb is that it?

[11:10:58] BADB172 aaabbb: I'll try to read it again, I guess the problem is it's not necessarily how framebuffer works but how fbcon uses the framebuffer by default. I guess I could set loglevel so that nothing is output and then disable blinking cursor, but it seems like there should be a simpler way to just "disable_fb_console();" so I don't have to worry about it doing something like refreshing screen and messing with my

[11:11:04] BADB172 output because it's running in the background

[11:12:20] BADB172 yeah, after the boot is complete I want to disable the console that's on the screen and start drawing my own thing to the framebuffer without having to worry that kernel is trying to do something with the framebuffer too (like it currently does, e.g. it redraws the blinking cursor over my graphics or if new printk happens it will too overwrite my graphics etc)

[11:13:11] aaabbb maybe boot with "console=/dev/null" in the kernel parameters?

[11:13:30] aaabbb what you want to do is tell the kernel not to attach the console to the framebuffer

[11:14:21] aaabbb another possibility is ioctl(fb_fd, KDSETMODE, KD_GRAPHICS)

[11:15:09] aaabbb BADB172: https://www.man7.org/linux/man-pages/man4/console_ioctl.4.html gives more info about that

[11:15:10] Demon [url] ioctl_console(2) - Linux manual page | www.man7.org

[11:15:11] nR [IRC-nERDs] <+nerds> [ioctl_console(2) - Linux manual page]

[11:15:29] aaabbb setting it to graphics mode is probably preferable to murdering the console itself

[11:16:49] BADB172 I guess that ioctl to set it to KD_GRAPHICS is what I've been looking, I would like to have the console shown while booting so if there's any kind of errors it would show information about them but if everything goes alright then my application starts running and will have the framebuffer to itself

[11:16:59] aaabbb yeah then you want the ioctl

[11:17:04] aaabbb on the console

[11:17:34] BADB172 I'll try that, thank you very much! looks like my google-fu skills need some improving

[11:18:08] aaabbb i looked up "linux framebuffer disable console" and "linux fb detach console" and stuff lke that

[11:35:05] BADB172 well, at least that hides the cursor but printk messages are being rendered. for example when I plug USB device it will mess my graphics up until next redraw happens, ouch. this is quite a puzzle for such a simple thing!

[11:35:25] aaabbb you can change the loglevel to remove those

[11:35:43] aaabbb "strace dmesg -D" and see how it does it

[11:36:37] aaabbb syslog(6) is the syscall apparently

[11:36:55] aaabbb 6 = SYSLOG_ACTION_CONSOLE_OFF

[11:52:32] BADB172 aaabbb: cool, that did it, thanks! I was just surprised there is no single function to set console status to off, that would seem like the most logical API. but I guess interfacing with kernel isn't always simple :) fwiw sysrq messages still mess up my graphics but those are a really special case, after all user could issue magic sysrq command to halt the system or whatever so I'm not worried about that

[11:53:24] aaabbb you can prevent sysrq with kernel.sysrq i believe

[11:53:27] BADB172 and if needed I could disable those sysrq keys that are a problem, it's not an issue for me right now. thanks again, this is really great!

[11:53:37] BADB172 yeah it's no problem :)

[11:53:47] aaabbb that will let you set a bitmask to disable specific sysrq. ofc kernel panic will still print :p

[11:57:25] * sftp joined #linux

[12:25:17] * Guest228594014463 joined #linux

[12:55:40] * PupUserbbc1da joined #linux

[12:56:12] * PupUserbbc1da left #linux

[13:10:50] * sirbravo_ joined #linux

[13:17:23] * tmz joined #linux

[13:20:00] * CodeSlingerPaul joined #linux

[13:44:19] * web-10 joined #linux

[14:03:37] * antoine49 joined #linux

[14:10:22] * Netsplit healed 2 users rejoined

Click to toggle user list

oopsie web-10

[14:46:40] * gabes5 joined #linux

[14:50:16] * web-10 joined #linux

[15:04:38] * bergelmir92 joined #linux

[15:16:14] * antoine49 joined #linux

[15:26:46] * web-10 joined #linux

[15:31:19] * Coniass joined #linux

[15:33:14] * woodwose joined #linux

[15:46:24] * ahmer joined #linux

[16:27:24] * vi64 joined #linux

[16:28:46] * brainium joined #linux

[16:32:39] * seekr joined #linux

[16:41:34] * Guest228594014463 joined #linux

[16:43:31] * bergelmir92 joined #linux

[17:07:05] * etnguyen03 joined #linux

[17:31:36] * robo joined #linux

[17:36:01] * Haroeris joined #linux

[17:38:27] * Psycho joined #linux

[17:42:01] * shazzr0 joined #linux

[17:55:19] * web-10 joined #linux

[18:07:38] * esraa joined #linux

[18:30:45] * web-10 joined #linux

[19:00:40] * Bellum joined #linux

[19:45:39] * tech joined #linux

[20:01:21] * tech joined #linux

[20:24:31] * auser0 joined #linux

[20:25:39] * tech_ joined #linux

[20:39:56] * auser0 joined #linux

[20:47:52] * KareemPharmacist joined #linux

[20:55:05] * illicit_user853 joined #linux

[21:27:37] * lyri joined #linux

[21:34:44] * rasa joined #linux

[21:41:19] * heather joined #linux

[21:41:19] * Google set mode +o heather

[21:47:03] * Guest228594014463 joined #linux

[21:56:51] * krushia joined #linux

[21:57:30] * jared joined #linux

[22:48:22] * etnguyen03 joined #linux

[23:17:54] * aagreb joined #linux

[23:20:14] * Intruder777 joined #linux

[23:21:27] aagreb hi

[23:22:31] jared hello

[23:31:05] aagreb I have a weird problem, I get random segfaults when launching different gnome applications

[23:31:10] aagreb can someone help me with that?

[23:34:01] * Intruder777 left #linux

[23:34:52] heather what other information can you provide?

[23:35:11] heather how about you reproduce it, and send us a screenshot from a terminal

[23:40:15] aagreb For example whenever I try to launch gedit I get a segfault. Interestingly it only happens with my user. As root i can launch it without problems. https://imgur.com/a/cQkqI2e

[23:40:15] Demon [url] Imgur: The magic of the Internet | imgur.com

[23:40:16] nR [IRC-nERDs] <+nerds> [Imgur: The magic of the Internet]

[23:41:54] aagreb Another problem that I have is that I get a segault when I enter certain directories in nautilus. I already found out that it has to have something to do with the filename. For example all directories containing a file ending in .json crashes nautilus with a sefault

[23:42:30] aagreb The logs of nautillus don't inlcude any suspicious information, it just crashes

[23:43:11] aagreb Like the other problem this only happens with my user, not with root

[23:43:54] End3r I would wipe your ~/.config dir (AFTER BACKING IT UP) as root, then logging back in as the user and see if it still happens. I would bet it is a config error.

[23:44:06] aagreb Here's some more information about my system: https://imgur.com/a/Vj5Zy9D

[23:44:06] Demon [url] Imgur: The magic of the Internet | imgur.com

[23:44:06] nR [IRC-nERDs] <+nerds> [Imgur: The magic of the Internet]

[23:44:47] End3r dinner time, bbl

[23:51:04] * Guest228594014463 joined #linux

[23:53:47] * etnguyen03 joined #linux

#linux Bot Logged User list

Channel Log Archive for #linux

IRC Log Archive