/g/ - syscall of the day: uname - Technology


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Anonymous
syscall of the day: uname 02/27/26(Fri)08:40:56 No.108252317

File: 1724124941627724.webm (1.15 MB, 1080x1920)

syscall of the day: uname Anonymous 02/27/26(Fri)08:40:56 No.108252317

previous: >>108244624
#define __NR_uname                63
https://man7.org/linux/man-pages/man2/uname.2.html

tl;dr:
get your kernel version

it's actually a bit more than just kernel version, though
struct utsname {
               char sysname[];    /* Operating system name (e.g., "Linux") */
               char nodename[];   /* Name within communications network to which the node is attached, if any */
               char release[];    /* Operating system release (e.g., "2.6.28") */
               char version[];    /* Operating system version */
               char machine[];    /* Hardware type identifier */
#ifdef _GNU_SOURCE
               char domainname[]; /* NIS or YP domain name */
#endif
};
useful for what it does, and quite literally nothing else lol

if you want to be nice and help keep the thread bumped, run
uname -a
and post the results ITT. or, if you're feeling adventurous, use the syscall together with a
__builtin_dump_struct
and print it nicely formatted into a struct

relevant resources:
man man
man syscalls
https://man7.org/linux/man-pages/
https://linux.die.net/man/
https://elixir.bootlin.com/linux/
https://elixir.bootlin.com/musl/
https://elixir.bootlin.com/glibc/

Anonymous
02/27/26(Fri)09:01:24 No.108252443

Anonymous 02/27/26(Fri)09:01:24 No.108252443

File: uname.png (15 KB, 1184x170)

15 KB PNG

:^)

Anonymous
02/27/26(Fri)09:04:07 No.108252452

Anonymous 02/27/26(Fri)09:04:07 No.108252452

>>108252317
That bitch inspires so much confidence. I'm glad the world is underpinned by such competent security personnel keeping it from blowing up on itself.

Anonymous
02/27/26(Fri)09:12:42 No.108252505

Anonymous 02/27/26(Fri)09:12:42 No.108252505

I didn't know that uname is a syscall nor that it's defined in posix. I thought it was linux specific and that uname read data from /proc

Anonymous
02/27/26(Fri)09:14:08 No.108252521

Anonymous 02/27/26(Fri)09:14:08 No.108252521

>>108252317
>
__builtin_dump_struct
Amazin, I didn't know about this

Anonymous
02/27/26(Fri)09:17:25 No.108252544

Anonymous 02/27/26(Fri)09:17:25 No.108252544

>>108252521
it's one of my favorite builtins. especially in newer versions of clang, it looks so nice
my biggest complaint is that it doesn't always print out strings correctly, and it prints uintptrs in base 10
>>108252505
i believe proc displays different (but similar) info. there is definitely some overlap, though

Anonymous
02/27/26(Fri)09:18:32 No.108252553

Anonymous 02/27/26(Fri)09:18:32 No.108252553

>>108252544
>my biggest complaint is that it doesn't always print out strings correctly
I haven't tested it yet but what do you mean specifically?

Anonymous
02/27/26(Fri)09:22:51 No.108252586

Anonymous 02/27/26(Fri)09:22:51 No.108252586

>>108252317
Wood

Anonymous
02/27/26(Fri)09:24:27 No.108252602

Anonymous 02/27/26(Fri)09:24:27 No.108252602

>>108252553
i can't remember off the top of my head, but it's something to the effect of not printing when the string is a pointer, only when it's an array

Anonymous
02/27/26(Fri)09:25:08 No.108252608

Anonymous 02/27/26(Fri)09:25:08 No.108252608

>>108252602
Ah I see, that kinda makes sense. Thanks.

Anonymous
02/27/26(Fri)09:29:18 No.108252639

Anonymous 02/27/26(Fri)09:29:18 No.108252639

>>108252443
So THIS is the "power" of PowerShell... wow...

Anonymous
02/27/26(Fri)09:30:41 No.108252645

Anonymous 02/27/26(Fri)09:30:41 No.108252645

>>108252317
How does anyone see shit like this and not go psycho

Anonymous
02/27/26(Fri)09:37:04 No.108252688

Anonymous 02/27/26(Fri)09:37:04 No.108252688

>>108252317
At my college, the associate's in cyber security requires Python.

Anonymous
02/27/26(Fri)09:40:59 No.108252716

Anonymous 02/27/26(Fri)09:40:59 No.108252716

>>108252688
what a fucking meme degree. associate's in cyber security. double whammy

Anonymous
02/27/26(Fri)09:41:49 No.108252724

Anonymous 02/27/26(Fri)09:41:49 No.108252724

>>108252317
Linux localhost 6.1.162-android14 [REDACTED] #1 SMP PREEMPT [REDACTED] aarch64 Android

Anonymous
02/27/26(Fri)09:44:17 No.108252748

Anonymous 02/27/26(Fri)09:44:17 No.108252748

>>108252317
>you don't need skills
>you don't need a certificate
>just get the skills and certifications
?
Rage bait?

Anonymous
02/27/26(Fri)10:38:04 No.108253084

Anonymous 02/27/26(Fri)10:38:04 No.108253084

I love to have sex.

Anonymous
02/27/26(Fri)10:50:01 No.108253152

Anonymous 02/27/26(Fri)10:50:01 No.108253152

>>108253084
proof?

Anonymous
02/27/26(Fri)10:53:39 No.108253177

Anonymous 02/27/26(Fri)10:53:39 No.108253177

>>108253152
Illegal where I live ("revenge porn").

Anonymous
02/27/26(Fri)13:15:39 No.108254145

Anonymous 02/27/26(Fri)13:15:39 No.108254145

Linux bazzite 6.17.7-ba25.fc43.x86_64 #1 SMP PREEMPT_DYNAMIC Mon Jan 19 05:47:43 UTC 2026 x86_64 GNU/Linux
>>108252688
Python is useful for cyber security as a scripting language. I don't know if it's the only language you should consider though.

Anonymous
02/27/26(Fri)14:11:11 No.108254625

Anonymous 02/27/26(Fri)14:11:11 No.108254625

>>108252317
reminds me of the auxv from the sysv abi, that one is similar

Anonymous
02/27/26(Fri)14:16:43 No.108254665

Anonymous 02/27/26(Fri)14:16:43 No.108254665

File: Bildschirmfoto_20260227_201604.png (21 KB, 369x316)

21 KB PNG

uuh well. if they were char pointers clang might try to print them as strings?

Anonymous
02/27/26(Fri)14:24:26 No.108254729

Anonymous 02/27/26(Fri)14:24:26 No.108254729

>>108252317
I hate tiktok and that whole generation so fucking much it's unreal.

Anonymous
02/27/26(Fri)16:26:21 No.108255908

Anonymous 02/27/26(Fri)16:26:21 No.108255908

why are women so cringe?

Anonymous
02/27/26(Fri)17:06:20 No.108256276

Anonymous 02/27/26(Fri)17:06:20 No.108256276

>>108254665
Use puts not printf, you sent it as the format string and it will crash if there is a % anywhere in the strings

Anonymous
02/27/26(Fri)17:09:48 No.108256318

Anonymous 02/27/26(Fri)17:09:48 No.108256318

>>108252317
Is that the new ceo of XBOX?

Anonymous
02/27/26(Fri)18:21:16 No.108257010

Anonymous 02/27/26(Fri)18:21:16 No.108257010

>>108252317
any field that starts getting represented by women is a dead field and won't be around in a decade after ai wipes out most white collar work. cybersecurity is done for, start finding work in construction or oil fields.

Anonymous
02/27/26(Fri)18:58:51 No.108257375

Anonymous 02/27/26(Fri)18:58:51 No.108257375

>>108256276
According to clang documentation you should use printf https://clang.llvm.org/docs/LanguageExtensions.html#builtin-dump-struct

Anonymous
02/27/26(Fri)19:03:11 No.108257416

Anonymous 02/27/26(Fri)19:03:11 No.108257416

>>108253177
get someone to consent to it
>>108254665
uggghhhh it's so frustrating when it pulls this shit
>>108255908
we just can't help it :^)

Anonymous
02/27/26(Fri)22:14:59 No.108259046

Anonymous 02/27/26(Fri)22:14:59 No.108259046

bampu

Anonymous
02/27/26(Fri)22:59:35 No.108259333

Anonymous 02/27/26(Fri)22:59:35 No.108259333

>>108252317
I can pentest her

Anonymous
02/28/26(Sat)06:48:09 No.108261514

Anonymous 02/28/26(Sat)06:48:09 No.108261514

File: 2nd try.png (61 KB, 760x500)

61 KB PNG

>>108256276
no, puts doesn't work, complaining about too many arguments.
>>108257416
char pointers werked

Anonymous
02/28/26(Sat)07:44:23 No.108261741

Anonymous 02/28/26(Sat)07:44:23 No.108261741

>>108252317
Linux x-MS-7A34 6.17.0-14-generic #14~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Jan 15 15:52:10 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

Anonymous
02/28/26(Sat)10:29:14 No.108262555

Anonymous 02/28/26(Sat)10:29:14 No.108262555

>>108261514
yeah okay, that's what it was. really bizarre, right? you'd think a char buffer would be even safer to print than a pointer. who knows why they do the things that they do
but they could at least have the decency to hexdump the buffer

Anonymous
02/28/26(Sat)12:43:39 No.108263323

Anonymous 02/28/26(Sat)12:43:39 No.108263323

Darwin 192.168.1.42 25.2.0 Darwin Kernel Version 25.2.0: Tue Nov 18 21:09:55 PST 2025; root:xnu-12377.61.12~1/RELEASE_ARM64_T8103 arm64

Anonymous
02/28/26(Sat)13:03:39 No.108263423

Anonymous 02/28/26(Sat)13:03:39 No.108263423

>>108254665
I've also just noticed that clang gives up on the declarator and just prints the type name using Java-esque type declaration.

Anonymous
02/28/26(Sat)13:18:03 No.108263501

Anonymous 02/28/26(Sat)13:18:03 No.108263501

>>108263423
what do you mean?

Anonymous
02/28/26(Sat)13:33:37 No.108263588

Anonymous 02/28/26(Sat)13:33:37 No.108263588

File: crimes.png (42 KB, 749x418)

42 KB PNG

>>108263501
look at the type of of sysname etc.
char[65] sysname = [some hex number]
in C the brackets would be on the other side of the variable name, so I thought that clang does aways with accurate type information.

What it actually does it print the abstract declarator, followed by the variable name, see picrel

Anonymous
02/28/26(Sat)13:46:21 No.108263673

Anonymous 02/28/26(Sat)13:46:21 No.108263673

>>108263588
oh yeah it unwraps all the typedefs

Anonymous
02/28/26(Sat)13:54:03 No.108263720

Anonymous 02/28/26(Sat)13:54:03 No.108263720

>>108263673
I'm sure it does, but that's not what I meant

Anonymous
02/28/26(Sat)13:58:50 No.108263748

Anonymous 02/28/26(Sat)13:58:50 No.108263748

>>108263720
well i have no idea what you're talking about then, i'm sorry to say

Anonymous
02/28/26(Sat)21:41:34 No.108266987

Anonymous 02/28/26(Sat)21:41:34 No.108266987

>>108263748
right so. in C, types you define go somewhat unusually to the left AND the right of the variable you're defining.
so an array of pointers to integers in C is
int *array[]
not
int []*array
as you might expect. Above in >>108254665, the types were listed as char[65], which is why it seemed to me that clang's formatter there disregarded strict allegiance to C typing rules. further experiments in >>108263588 however, concluded that that wasn't the case, and instead clang just prints out the abstract declarator, followed by the variable name.
the abstract declarator is a piece of C grammar, which can be used to describe a type, such as in function prototypes or in the argument of sizeof etc., without an intervening type name.
and it turns out that that is what clang is using when dumping structs.

Anonymous
02/28/26(Sat)22:40:42 No.108267356

Anonymous 02/28/26(Sat)22:40:42 No.108267356

>>108266987
oohhh i was totally thinking about the wrong brackets
yes, that makes a lot more sense now. thank you for explaining

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