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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2019 Cyril Hrubis <chrubis@suse.cz>
*/
#include <sys/mman.h>
#include <stdlib.h>
#define TST_NO_DEFAULT_MAIN
#include "tst_test.h"
struct map {
void *addr;
size_t size;
size_t buf_shift;
struct map *next;
};
static struct map *maps;
static void setup_canary(struct map *map)
{
size_t i;
char *buf = map->addr;
for (i = 0; i < map->buf_shift/2; i++) {
char c = random();
buf[map->buf_shift - i - 1] = c;
buf[i] = c;
}
}
static void check_canary(struct map *map)
{
size_t i;
char *buf = map->addr;
for (i = 0; i < map->buf_shift/2; i++) {
if (buf[map->buf_shift - i - 1] != buf[i]) {
tst_res(TWARN,
"pid %i: buffer modified address %p[%zi]",
getpid(), (char*)map->addr + map->buf_shift, -i-1);
}
}
}
void *tst_alloc(size_t size)
{
size_t page_size = getpagesize();
unsigned int pages = (size / page_size) + !!(size % page_size) + 1;
void *ret;
struct map *map = SAFE_MALLOC(sizeof(struct map));
static int print_msg = 1;
if (print_msg) {
tst_res(TINFO, "Test is using guarded buffers");
print_msg = 0;
}
ret = SAFE_MMAP(NULL, page_size * pages, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
mprotect(ret + (pages-1) * page_size, page_size, PROT_NONE);
map->addr = ret;
map->size = pages * page_size;
map->next = maps;
maps = map;
if (size % page_size)
map->buf_shift = page_size - (size % page_size);
else
map->buf_shift = 0;
setup_canary(map);
return ret + map->buf_shift;
}
static int count_iovec(int *sizes)
{
int ret = 0;
while (sizes[ret++] != -1);
return ret - 1;
}
struct iovec *tst_iovec_alloc(int sizes[])
{
int i, cnt = count_iovec(sizes);
struct iovec *iovec;
if (cnt <= 0)
return NULL;
iovec = tst_alloc(sizeof(struct iovec) * cnt);
for (i = 0; i < cnt; i++) {
if (sizes[i]) {
iovec[i].iov_base = tst_alloc(sizes[i]);
iovec[i].iov_len = sizes[i];
} else {
iovec[i].iov_base = NULL;
iovec[i].iov_base = 0;
}
}
return iovec;
}
void tst_buffers_alloc(struct tst_buffers bufs[])
{
unsigned int i;
for (i = 0; bufs[i].ptr; i++) {
if (bufs[i].size)
*((void**)bufs[i].ptr) = tst_alloc(bufs[i].size);
else
*((void**)bufs[i].ptr) = tst_iovec_alloc(bufs[i].iov_sizes);
}
}
char *tst_strdup(const char *str)
{
size_t len = strlen(str);
char *ret = tst_alloc(len + 1);
return strcpy(ret, str);
}
void tst_free_all(void)
{
struct map *i = maps;
while (i) {
struct map *j = i;
check_canary(i);
SAFE_MUNMAP(i->addr, i->size);
i = i->next;
free(j);
}
maps = NULL;
}
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