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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) International Business Machines Corp., 2002
*
* 06/2002 Written by Paul Larson
*/
/*\
* [Description]
*
* Test for ENOMEM, EPERM errors.
*
* 1) mlock(2) fails with ENOMEM if some of the specified address range
* does not correspond to mapped pages in the address space of
* the process.
*
* 2) mlock(2) fails with ENOMEM if the caller had a non-zero RLIMIT_MEMLOCK
* soft resource limit, but tried to lock more memory than the limit
* permitted. This limit is not enforced if the process is
* privileged (CAP_IPC_LOCK).
*
* 3) mlock(2) fails with EPERM if the caller was not privileged (CAP_IPC_LOCK)
* and its RLIMIT_MEMLOCK soft resource limit was 0.
*/
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <pwd.h>
#include "tst_test.h"
static size_t len;
static struct rlimit original;
static struct passwd *ltpuser;
static void test_enomem1(void)
{
void *addr;
addr = SAFE_MMAP(NULL, len, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
SAFE_MUNMAP(addr, len);
TST_EXP_FAIL(mlock(addr, len), ENOMEM, "mlock(%p, %lu)", addr, len);
}
static void test_enomem2(void)
{
void *addr;
struct rlimit rl;
rl.rlim_max = len - 1;
rl.rlim_cur = len - 1;
SAFE_SETRLIMIT(RLIMIT_MEMLOCK, &rl);
addr = SAFE_MMAP(NULL, len, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
SAFE_SETEUID(ltpuser->pw_uid);
TST_EXP_FAIL(mlock(addr, len), ENOMEM, "mlock(%p, %lu)", addr, len);
SAFE_SETEUID(0);
SAFE_MUNMAP(addr, len);
SAFE_SETRLIMIT(RLIMIT_MEMLOCK, &original);
}
static void test_eperm(void)
{
void *addr;
struct rlimit rl;
rl.rlim_max = 0;
rl.rlim_cur = 0;
SAFE_SETRLIMIT(RLIMIT_MEMLOCK, &rl);
addr = SAFE_MMAP(NULL, len, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
SAFE_SETEUID(ltpuser->pw_uid);
TST_EXP_FAIL(mlock(addr, len), EPERM, "mlock(%p, %lu)", addr, len);
SAFE_SETEUID(0);
SAFE_MUNMAP(addr, len);
SAFE_SETRLIMIT(RLIMIT_MEMLOCK, &original);
}
static void run(void)
{
test_enomem1();
test_enomem2();
test_eperm();
}
static void setup(void)
{
ltpuser = SAFE_GETPWNAM("nobody");
len = getpagesize();
SAFE_GETRLIMIT(RLIMIT_MEMLOCK, &original);
}
static struct tst_test test = {
.needs_root = 1,
.setup = setup,
.test_all = run,
};
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