mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-20 01:37:39 +03:00
110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
/*
|
|
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Types.h>
|
|
#include <LibTest/TestCase.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <inttypes.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
|
|
static u8 read_buffer[0x100000];
|
|
|
|
static ALWAYS_INLINE bool mem_chunk(int fd, u64 base, u64 length)
|
|
{
|
|
u64 mmoffset = base % sysconf(_SC_PAGESIZE);
|
|
void* mmp = mmap(NULL, mmoffset + length, PROT_READ, MAP_SHARED, fd, base - mmoffset);
|
|
if (mmp == MAP_FAILED)
|
|
return false;
|
|
if (munmap(mmp, mmoffset + length) < 0)
|
|
perror("munmap");
|
|
return true;
|
|
}
|
|
|
|
enum class ReadResult {
|
|
SeekFailure,
|
|
ReadFailure,
|
|
ReadSuccess,
|
|
};
|
|
|
|
static ALWAYS_INLINE ReadResult read_chunk(int fd, u64 base, u64 length)
|
|
{
|
|
VERIFY(length <= sizeof(read_buffer));
|
|
auto rs = lseek(fd, base, SEEK_SET);
|
|
if (rs < 0) {
|
|
fprintf(stderr, "Couldn't seek to offset %" PRIi64 " while verifying: %s\n", base, strerror(errno));
|
|
return ReadResult::SeekFailure;
|
|
}
|
|
if (read(fd, read_buffer, length) < 0)
|
|
return ReadResult::ReadFailure;
|
|
return ReadResult::ReadSuccess;
|
|
}
|
|
|
|
TEST_CASE(test_memory_access_device_read)
|
|
{
|
|
int rc = geteuid();
|
|
EXPECT_EQ(rc, 0);
|
|
|
|
int fd = open("/dev/mem", O_RDONLY);
|
|
EXPECT(fd >= 0);
|
|
|
|
// FIXME: This is expected to work on QEMU machines (both 440FX and Q35),
|
|
// however, it will be much nicer to have some sort of a node in the ProcFS
|
|
// to expose physical memory ranges (e820 memory map).
|
|
|
|
auto read_result = read_chunk(fd, 0x0, 0x100000);
|
|
EXPECT_EQ(read_result, ReadResult::ReadFailure);
|
|
|
|
read_result = read_chunk(fd, 0xe0000, 0x100000 - 0xe0000);
|
|
EXPECT_EQ(read_result, ReadResult::ReadSuccess);
|
|
|
|
read_result = read_chunk(fd, 0x100000, 0x200000 - 0x100000);
|
|
EXPECT_EQ(read_result, ReadResult::ReadFailure);
|
|
|
|
read_result = read_chunk(fd, 0xf0000, 70000);
|
|
EXPECT_EQ(read_result, ReadResult::ReadFailure);
|
|
|
|
read_result = read_chunk(fd, 0xfffc0000, 16384);
|
|
EXPECT_EQ(read_result, ReadResult::ReadSuccess);
|
|
|
|
read_result = read_chunk(fd, 0xfffc0000, 0x100000);
|
|
EXPECT_EQ(read_result, ReadResult::ReadFailure);
|
|
}
|
|
|
|
TEST_CASE(test_memory_access_device_mmap)
|
|
{
|
|
int rc = geteuid();
|
|
EXPECT_EQ(rc, 0);
|
|
|
|
int fd = open("/dev/mem", O_RDONLY);
|
|
EXPECT(fd >= 0);
|
|
|
|
// FIXME: This is expected to work on QEMU machines (both 440FX and Q35),
|
|
// however, it will be much nicer to have some sort of a node in the ProcFS
|
|
// to expose physical memory ranges (e820 memory map).
|
|
|
|
auto mmap_result = mem_chunk(fd, 0xe0000, 0x100000 - 0xe0000);
|
|
EXPECT_EQ(mmap_result, true);
|
|
|
|
mmap_result = mem_chunk(fd, 0x100000, 0x200000 - 0x100000);
|
|
EXPECT_EQ(mmap_result, false);
|
|
|
|
mmap_result = mem_chunk(fd, 0xf0000, 70000);
|
|
EXPECT_EQ(mmap_result, false);
|
|
|
|
mmap_result = mem_chunk(fd, 0xfffc0000, 16384);
|
|
EXPECT_EQ(mmap_result, true);
|
|
|
|
mmap_result = mem_chunk(fd, 0xfffc0000, 0x100000);
|
|
EXPECT_EQ(mmap_result, false);
|
|
}
|