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// SPDX-License-Identifier: GPL-2.0
/*
* This test covers the anonymous VMA naming functionality through prctl calls
*/
#include <errno.h>
#include <sys/prctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <string.h>
#include "../kselftest_harness.h"
#define AREA_SIZE 1024
#define GOOD_NAME "goodname"
#define BAD_NAME "badname\1"
#ifndef PR_SET_VMA
#define PR_SET_VMA 0x53564d41
#define PR_SET_VMA_ANON_NAME 0
#endif
int rename_vma(unsigned long addr, unsigned long size, char *name)
{
int res;
res = prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, addr, size, name);
if (res < 0)
return -errno;
return res;
}
int was_renaming_successful(char *target_name, unsigned long ptr)
{
FILE *maps_file;
char line_buf[512], name[128], mode[8];
unsigned long start_addr, end_addr, offset;
unsigned int major_id, minor_id, node_id;
char target_buf[128];
int res = 0, sscanf_res;
// The entry name in maps will be in format [anon:<target_name>]
sprintf(target_buf, "[anon:%s]", target_name);
maps_file = fopen("/proc/self/maps", "r");
if (!maps_file) {
printf("## /proc/self/maps file opening error\n");
return 0;
}
// Parse the maps file to find the entry we renamed
while (fgets(line_buf, sizeof(line_buf), maps_file)) {
sscanf_res = sscanf(line_buf, "%lx-%lx %7s %lx %u:%u %u %s", &start_addr,
&end_addr, mode, &offset, &major_id,
&minor_id, &node_id, name);
if (sscanf_res == EOF) {
res = 0;
printf("## EOF while parsing the maps file\n");
break;
}
if (!strcmp(name, target_buf) && start_addr == ptr) {
res = 1;
break;
}
}
fclose(maps_file);
return res;
}
FIXTURE(vma) {
void *ptr_anon, *ptr_not_anon;
};
FIXTURE_SETUP(vma) {
self->ptr_anon = mmap(NULL, AREA_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
ASSERT_NE(self->ptr_anon, NULL);
self->ptr_not_anon = mmap(NULL, AREA_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE, 0, 0);
ASSERT_NE(self->ptr_not_anon, NULL);
}
FIXTURE_TEARDOWN(vma) {
munmap(self->ptr_anon, AREA_SIZE);
munmap(self->ptr_not_anon, AREA_SIZE);
}
TEST_F(vma, renaming) {
TH_LOG("Try to rename the VMA with correct parameters");
EXPECT_GE(rename_vma((unsigned long)self->ptr_anon, AREA_SIZE, GOOD_NAME), 0);
EXPECT_TRUE(was_renaming_successful(GOOD_NAME, (unsigned long)self->ptr_anon));
TH_LOG("Try to pass invalid name (with non-printable character \\1) to rename the VMA");
EXPECT_EQ(rename_vma((unsigned long)self->ptr_anon, AREA_SIZE, BAD_NAME), -EINVAL);
TH_LOG("Try to rename non-anonymous VMA");
EXPECT_EQ(rename_vma((unsigned long) self->ptr_not_anon, AREA_SIZE, GOOD_NAME), -EINVAL);
}
TEST_HARNESS_MAIN
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