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Ivan Komarov dfyz

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dfyz / ftrace.txt
Last active April 9, 2024 23:11
https://github.com/jart/cosmopolitan/issues/1138
>src\forktest.com --ftrace
FUN 2556 12684 5'596'885 440 &__nocolor_init
FUN 2556 12684 5'810'695 456 &getenv
FUN 2556 12684 5'934'173 440 &winclock_init
FUN 2556 12684 6'158'823 456 &QueryPerformanceCounter
FUN 2556 12684 6'378'783 456 &QueryPerformanceFrequency
FUN 2556 12684 6'981'566 440 &outinit
FUN 2556 12684 7'126'687 456 &__fflush_register
FUN 2556 12684 7'245'432 504 &pthread_mutex_lock
FUN 2556 12684 7'351'612 552 &nsync_mu_lock
@dfyz
dfyz / linux_aarch64.png
Last active February 25, 2024 14:35
TeX goes cross-platform
linux_aarch64.png
@dfyz
dfyz / bad.txt
Created February 9, 2024 03:18
Busytex AR shenanigans
native/texlive/libs/potrace/Makefile:AR = ar
native/texlive/libs/gmp/Makefile:AR = ar
native/texlive/libs/libpng/Makefile:AR = ar
native/texlive/libs/pixman/Makefile:AR = ar
native/texlive/libs/harfbuzz/Makefile:AR = ar
native/texlive/libs/zziplib/Makefile:AR = ar
native/texlive/libs/teckit/Makefile:AR = ar
native/texlive/libs/gd/Makefile:AR = ar
native/texlive/libs/cairo/Makefile:AR = ar
native/texlive/libs/zlib/Makefile:AR = ar
@dfyz
dfyz / kutrace_large.jpg
Last active January 29, 2024 01:57
Some additions to https://thume.ca/2023/12/02/tracing-methods
kutrace_large.jpg
@dfyz
dfyz / blackout.py
Created September 22, 2023 00:15
from pwn import *
import string
PROMPT = b'> '
def main():
with remote('blackout.seccon.games', 9999) as tube:
@dfyz
dfyz / brute.cpp
Created September 13, 2023 23:10
/***
* Instructions:
*
* Just code everything in C, and add __device__ before every memory and func
* that should be accessible on GPU :)
*
* Test on GCC without GPU, just forks:
* gcc -x c -O3 -march=native -o brut brut.cu ; time ./brut 147db93f3e45f64:952781782a15ae6e
*
* CUDA prod:
@dfyz
dfyz / shellcoder.py
Last active June 18, 2023 04:13
from pwn import *
# padding; push 0; ret
TARGET = int.from_bytes(b'\x00\x00\x6a\x00\xc3', byteorder='little')
PROMPT = b': '
SHELLCODE = r'''
xor eax, eax
xor rdx, rdx
xor rsi, rsi
@dfyz
dfyz / RB.litmus
Last active May 7, 2023 18:51
Modeling incorrect SPSC ring buffer
AArch64 RB.correct
"
Theoretical results:
States 2
1:X6=0; 1:X9=61;
1:X6=1; 1:X9=41;
"
{
0:X3=x; 0:X4=y; 0:X5=z;
1:X3=x; 1:X4=y; 1:X5=z;
@dfyz
dfyz / mask_ptr.c
Last active May 1, 2023 22:40
#define _GNU_SOURCE
#include <stdio.h>
#include <stdint.h>
#include <err.h>
#include <sys/mman.h>
#include <sys/random.h>
#include <unistd.h>
@dfyz
dfyz / and with bitmasks
Last active April 10, 2023 01:24
aarch64 (8 bytes)
00 88 74 92 and x0, x0, #0x7ffffffff000
c0 03 5f d6 ret
riscv64 (10 bytes)
b7 05 00 e0 lui a1 0xe0000
c5 81 c.srli a1 0x11
6d 8d c.and a0 a1
82 80 c.jr ra