mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-15 07:09:43 +03:00
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
/*
|
|
* Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Assertions.h>
|
|
#include <LibCore/ArgsParser.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/mman.h>
|
|
|
|
static void write8(void* ptr) { *(uint8_t volatile*)ptr = 1; }
|
|
static void write16(void* ptr) { *(uint16_t volatile*)ptr = 1; }
|
|
static void write32(void* ptr) { *(uint32_t volatile*)ptr = 1; }
|
|
static void write64(void* ptr) { *(double volatile*)ptr = 1.0; }
|
|
// A u64 write might be translated by the compiler as a 32-then-32-bit write:
|
|
// static void write64_bad(void* ptr) { *(volatile uint64_t*)ptr = 1.0; }
|
|
// Let's hope this won't be translated like that.
|
|
// Godbolt says yes: https://godbolt.org/z/1b9WGo
|
|
|
|
static void run_test(void* region, ssize_t offset, size_t bits)
|
|
{
|
|
void* ptr = (char*)region + offset;
|
|
printf("Writing to %p\n", ptr);
|
|
switch (bits) {
|
|
case 8:
|
|
write8(ptr);
|
|
break;
|
|
case 16:
|
|
write16(ptr);
|
|
break;
|
|
case 32:
|
|
write32(ptr);
|
|
break;
|
|
case 64:
|
|
write64(ptr);
|
|
break;
|
|
default:
|
|
VERIFY_NOT_REACHED();
|
|
}
|
|
}
|
|
|
|
int main(int argc, char** argv)
|
|
{
|
|
bool do_static = false;
|
|
int size = 10 * PAGE_SIZE;
|
|
int offset = 10 * PAGE_SIZE - 1;
|
|
int bits = 16;
|
|
|
|
auto args_parser = Core::ArgsParser();
|
|
args_parser.set_general_help(
|
|
"Access out of bounds memory; a great testcase for UserEmulator.");
|
|
args_parser.add_option(do_static, "Use a static region instead of an mmap'ed region. Fixes 'size' to 10*PAGESIZE = 40960. (Default: false)", "static", 'S');
|
|
args_parser.add_option(size, "The size of the region to allocate. (Default: 10*PAGESIZE = 40960)", "size", 's', "size");
|
|
args_parser.add_option(offset, "The signed offset at which to start writing. (Default: 10*PAGESIZE-1 = 40959)", "offset", 'o', "offset");
|
|
args_parser.add_option(bits, "Amount of bits to write in a single instruction. (Default: 16)", "bits", 'b', "bits");
|
|
args_parser.parse(argc, argv);
|
|
|
|
if (do_static)
|
|
size = 10 * PAGE_SIZE;
|
|
|
|
printf("Writing %d bits to %s region of size %d at offset %d.\n",
|
|
bits, do_static ? "static" : "MMAP", size, offset);
|
|
|
|
if (do_static) {
|
|
// Let's just hope the linker puts nothing after it!
|
|
static unsigned char region[PAGE_SIZE * 10] = { 0 };
|
|
|
|
run_test(region, offset, 64);
|
|
} else {
|
|
void* region = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
|
|
VERIFY(region);
|
|
run_test(region, offset, bits);
|
|
}
|
|
|
|
printf("FAIL (should have caused SIGSEGV)\n");
|
|
return 1;
|
|
}
|