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5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
100 lines
3.9 KiB
C++
100 lines
3.9 KiB
C++
/*
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* Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Assertions.h>
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#include <LibCore/ArgsParser.h>
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#include <mman.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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static void write8(void* ptr) { *(volatile uint8_t*)ptr = 1; }
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static void write16(void* ptr) { *(volatile uint16_t*)ptr = 1; }
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static void write32(void* ptr) { *(volatile uint32_t*)ptr = 1; }
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static void write64(void* ptr) { *(volatile double*)ptr = 1.0; }
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// A u64 write might be translated by the compiler as a 32-then-32-bit write:
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// static void write64_bad(void* ptr) { *(volatile uint64_t*)ptr = 1.0; }
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// Let's hope this won't be translated like that.
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// Godbolt says yes: https://godbolt.org/z/1b9WGo
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static void run_test(void* region, ssize_t offset, size_t bits)
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{
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void* ptr = (char*)region + offset;
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printf("Writing to %p\n", ptr);
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switch (bits) {
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case 8:
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write8(ptr);
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break;
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case 16:
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write16(ptr);
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break;
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case 32:
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write32(ptr);
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break;
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case 64:
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write64(ptr);
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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int main(int argc, char** argv)
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{
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bool do_static = false;
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int size = 10 * PAGE_SIZE;
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int offset = 10 * PAGE_SIZE - 1;
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int bits = 16;
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auto args_parser = Core::ArgsParser();
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args_parser.set_general_help(
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"Access out of bounds memory; a great testcase for UserEmulator.");
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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');
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args_parser.add_option(size, "The size of the region to allocate. (Default: 10*PAGESIZE = 40960)", "size", 's', "size");
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args_parser.add_option(offset, "The signed offset at which to start writing. (Default: 10*PAGESIZE-1 = 40959)", "offset", 'o', "offset");
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args_parser.add_option(bits, "Amount of bits to write in a single instruction. (Default: 16)", "bits", 'b', "bits");
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args_parser.parse(argc, argv);
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if (do_static)
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size = 10 * PAGE_SIZE;
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printf("Writing %d bits to %s region of size %d at offset %d.\n",
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bits, do_static ? "static" : "MMAP", size, offset);
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if (do_static) {
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// Let's just hope the linker puts nothing after it!
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static unsigned char region[PAGE_SIZE * 10] = { 0 };
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run_test(region, offset, 64);
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} else {
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void* region = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
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VERIFY(region);
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run_test(region, offset, bits);
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}
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printf("FAIL (should have caused SIGSEGV)\n");
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return 1;
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}
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