mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-20 01:37:39 +03:00
142 lines
3.4 KiB
C++
142 lines
3.4 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, the SerenityOS developers.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Types.h>
|
|
#include <elf.h>
|
|
#include <fcntl.h>
|
|
#include <pthread.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/wait.h>
|
|
#include <unistd.h>
|
|
|
|
bool volatile hax = false;
|
|
|
|
int main()
|
|
{
|
|
char buffer[16384];
|
|
|
|
auto& header = *(Elf32_Ehdr*)buffer;
|
|
header.e_ident[EI_MAG0] = ELFMAG0;
|
|
header.e_ident[EI_MAG1] = ELFMAG1;
|
|
header.e_ident[EI_MAG2] = ELFMAG2;
|
|
header.e_ident[EI_MAG3] = ELFMAG3;
|
|
header.e_ident[EI_CLASS] = ELFCLASS32;
|
|
header.e_ident[EI_DATA] = ELFDATA2LSB;
|
|
header.e_ident[EI_VERSION] = EV_CURRENT;
|
|
header.e_ident[EI_OSABI] = ELFOSABI_SYSV;
|
|
header.e_ident[EI_ABIVERSION] = 0;
|
|
header.e_type = ET_EXEC;
|
|
header.e_version = EV_CURRENT;
|
|
header.e_ehsize = sizeof(Elf32_Ehdr);
|
|
header.e_machine = EM_386;
|
|
header.e_shentsize = sizeof(Elf32_Shdr);
|
|
|
|
header.e_phnum = 1;
|
|
header.e_phoff = 52;
|
|
header.e_phentsize = sizeof(Elf32_Phdr);
|
|
|
|
auto* ph = (Elf32_Phdr*)(&buffer[header.e_phoff]);
|
|
ph[0].p_vaddr = 0x20000000;
|
|
ph[0].p_type = PT_LOAD;
|
|
ph[0].p_filesz = sizeof(buffer);
|
|
ph[0].p_memsz = sizeof(buffer);
|
|
ph[0].p_flags = PF_R | PF_W;
|
|
ph[0].p_align = PAGE_SIZE;
|
|
|
|
header.e_shnum = 3;
|
|
header.e_shoff = 1024;
|
|
|
|
u32 secret_address = 0x00184658;
|
|
|
|
auto* sh = (Elf32_Shdr*)(&buffer[header.e_shoff]);
|
|
sh[0].sh_type = SHT_SYMTAB;
|
|
sh[0].sh_offset = 2048;
|
|
sh[0].sh_entsize = sizeof(Elf32_Sym);
|
|
sh[0].sh_size = 1 * sizeof(Elf32_Sym);
|
|
|
|
sh[1].sh_type = SHT_STRTAB;
|
|
sh[1].sh_offset = secret_address - 0x01001000;
|
|
sh[1].sh_entsize = 0;
|
|
sh[1].sh_size = 1024;
|
|
|
|
sh[2].sh_type = SHT_STRTAB;
|
|
sh[2].sh_offset = 4096;
|
|
sh[2].sh_entsize = 0;
|
|
sh[2].sh_size = 1024;
|
|
header.e_shstrndx = 2;
|
|
|
|
auto* sym = (Elf32_Sym*)(&buffer[2048]);
|
|
sym[0].st_value = 0;
|
|
sym[0].st_name = 0;
|
|
|
|
header.e_entry = 0;
|
|
|
|
char path[] = "/tmp/x.XXXXXX";
|
|
auto fd = mkstemp(path);
|
|
if (fd < 0) {
|
|
perror("mkstemp");
|
|
return 1;
|
|
}
|
|
|
|
if (fchmod(fd, 0777) < 0) {
|
|
perror("chmod");
|
|
return 1;
|
|
}
|
|
|
|
int nwritten = write(fd, buffer, sizeof(buffer));
|
|
if (nwritten < 0) {
|
|
perror("write");
|
|
return 1;
|
|
}
|
|
|
|
sync();
|
|
|
|
auto* mapped = (u8*)mmap(nullptr, sizeof(buffer), PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0);
|
|
if (mapped == MAP_FAILED) {
|
|
perror("mmap");
|
|
return 1;
|
|
}
|
|
|
|
auto* writable_program_headers = (Elf32_Phdr*)(&mapped[header.e_phoff]);
|
|
|
|
pthread_attr_t attrs;
|
|
pthread_attr_init(&attrs);
|
|
sched_param high_prio { 99 };
|
|
pthread_attr_setschedparam(&attrs, &high_prio);
|
|
|
|
pthread_t t;
|
|
pthread_create(
|
|
&t, &attrs, [](void* ctx) -> void* {
|
|
auto& ph = *(volatile Elf32_Phdr*)ctx;
|
|
for (;;) {
|
|
if (!hax)
|
|
ph.p_offset = 0x60000000;
|
|
else
|
|
ph.p_offset = 0;
|
|
hax = !hax;
|
|
usleep(1);
|
|
}
|
|
},
|
|
&writable_program_headers[0]);
|
|
|
|
for (;;) {
|
|
|
|
if (!fork()) {
|
|
try_again:
|
|
printf("exec\n");
|
|
execl(path, "x", nullptr);
|
|
goto try_again;
|
|
}
|
|
|
|
printf("waitpid\n");
|
|
waitpid(-1, nullptr, 0);
|
|
}
|
|
}
|