ATF_TC_BODY(setrlimit_memlock, tc)
{
struct rlimit res;
void *buf;
long page;
pid_t pid;
int sta;
#ifdef __FreeBSD__
/* Set max_wired really really high to avoid EAGAIN */
set_vm_max_wired(INT_MAX);
#endif
page = sysconf(_SC_PAGESIZE);
ATF_REQUIRE(page >= 0);
buf = malloc(page);
pid = fork();
if (buf == NULL || pid < 0)
atf_tc_fail("initialization failed");
if (pid == 0) {
/*
* Try to lock a page while
* RLIMIT_MEMLOCK is zero.
*/
if (mlock(buf, page) != 0)
_exit(EXIT_FAILURE);
if (munlock(buf, page) != 0)
_exit(EXIT_FAILURE);
res.rlim_cur = 0;
res.rlim_max = 0;
if (setrlimit(RLIMIT_MEMLOCK, &res) != 0)
_exit(EXIT_FAILURE);
if (mlock(buf, page) != 0)
_exit(EXIT_SUCCESS);
(void)munlock(buf, page);
_exit(EXIT_FAILURE);
}
free(buf);
(void)wait(&sta);
if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
atf_tc_fail("RLIMIT_MEMLOCK not enforced");
}
ATF_TC_BODY(mlock_err, tc)
{
#ifdef __NetBSD__
unsigned long vmin = 0;
size_t len = sizeof(vmin);
#endif
void *invalid_ptr;
int null_errno = ENOMEM; /* error expected for NULL */
#ifdef __FreeBSD__
#ifdef VM_MIN_ADDRESS
if ((uintptr_t)VM_MIN_ADDRESS > 0)
null_errno = EINVAL; /* NULL is not inside user VM */
#endif
/* Set max_wired really really high to avoid EAGAIN */
set_vm_max_wired(INT_MAX);
#else
if (sysctlbyname("vm.minaddress", &vmin, &len, NULL, 0) != 0)
atf_tc_fail("failed to read vm.minaddress");
if (vmin > 0)
null_errno = EINVAL; /* NULL is not inside user VM */
#endif
errno = 0;
ATF_REQUIRE_ERRNO(null_errno, mlock(NULL, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(null_errno, mlock((char *)0, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(EINVAL, mlock((char *)-1, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(null_errno, munlock(NULL, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(null_errno, munlock((char *)0, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(EINVAL, munlock((char *)-1, page) == -1);
/*
* Try to create a pointer to an unmapped page - first after current
* brk will likely do.
*/
invalid_ptr = (void*)(((uintptr_t)sbrk(0)+page) & ~(page-1));
printf("testing with (hopefully) invalid pointer %p\n", invalid_ptr);
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, mlock(invalid_ptr, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, munlock(invalid_ptr, page) == -1);
}
ATF_TC_BODY(mlock_mmap, tc)
{
#ifdef __NetBSD__
static const int flags = MAP_ANON | MAP_PRIVATE | MAP_WIRED;
#else
static const int flags = MAP_ANON | MAP_PRIVATE;
#endif
void *buf;
#ifdef __FreeBSD__
/* Set max_wired really really high to avoid EAGAIN */
set_vm_max_wired(INT_MAX);
#endif
/*
* Make a wired RW mapping and check that mlock(2)
* does not fail for the (already locked) mapping.
*/
buf = mmap(NULL, page, PROT_READ | PROT_WRITE, flags, -1, 0);
ATF_REQUIRE(buf != MAP_FAILED);
#ifdef __FreeBSD__
/*
* The duplicate mlock call is added to ensure that the call works
* as described above without MAP_WIRED support.
*/
ATF_REQUIRE(mlock(buf, page) == 0);
#endif
ATF_REQUIRE(mlock(buf, page) == 0);
ATF_REQUIRE(munlock(buf, page) == 0);
ATF_REQUIRE(munmap(buf, page) == 0);
ATF_REQUIRE(munlock(buf, page) != 0);
/*
* But it should be impossible to mlock(2) a PROT_NONE mapping.
*/
buf = mmap(NULL, page, PROT_NONE, flags, -1, 0);
ATF_REQUIRE(buf != MAP_FAILED);
#ifdef __FreeBSD__
ATF_REQUIRE_ERRNO(ENOMEM, mlock(buf, page) != 0);
#else
ATF_REQUIRE(mlock(buf, page) != 0);
#endif
ATF_REQUIRE(munmap(buf, page) == 0);
}
ATF_TC_BODY(mlock_nested, tc)
{
const size_t maxiter = 100;
void *buf;
#ifdef __FreeBSD__
/* Set max_wired really really high to avoid EAGAIN */
set_vm_max_wired(INT_MAX);
#endif
buf = malloc(page);
ATF_REQUIRE(buf != NULL);
for (size_t i = 0; i < maxiter; i++)
ATF_REQUIRE(mlock(buf, page) == 0);
ATF_REQUIRE(munlock(buf, page) == 0);
free(buf);
}
ATF_TC_BODY(mlock_err, tc)
{
#ifdef __NetBSD__
unsigned long vmin = 0;
size_t len = sizeof(vmin);
#endif
#if !defined(__aarch64__) && !defined(__riscv)
void *invalid_ptr;
#endif
int null_errno = ENOMEM; /* error expected for NULL */
void *buf;
#ifdef __FreeBSD__
#ifdef VM_MIN_ADDRESS
if ((uintptr_t)VM_MIN_ADDRESS > 0)
null_errno = EINVAL; /* NULL is not inside user VM */
#endif
/* Set max_wired really really high to avoid EAGAIN */
set_vm_max_wired(INT_MAX);
#else
if (sysctlbyname("vm.minaddress", &vmin, &len, NULL, 0) != 0)
atf_tc_fail("failed to read vm.minaddress");
/*
* Any bad address must return ENOMEM (for lock & unlock)
*/
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, mlock(NULL, page) == -1);
if (vmin > 0)
null_errno = EINVAL; /* NULL is not inside user VM */
#endif
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)0, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)-1, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, munlock(NULL, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)0, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)-1, page) == -1);
buf = malloc(page);
ATF_REQUIRE(buf != NULL);
/*
* unlocking memory that is not locked is an error...
*/
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, munlock(buf, page) == -1);
/* There is no sbrk on AArch64 and RISC-V */
#if !defined(__aarch64__) && !defined(__riscv)
/*
* These are permitted to fail (EINVAL) but do not on NetBSD
*/
ATF_REQUIRE(mlock((void *)(((uintptr_t)buf) + page/3), page/5) == 0);
ATF_REQUIRE(munlock((void *)(((uintptr_t)buf) + page/3), page/5) == 0);
(void)free(buf);
/*
* Try to create a pointer to an unmapped page - first after current
* brk will likely do.
*/
invalid_ptr = (void*)(((uintptr_t)sbrk(0)+page) & ~(page-1));
printf("testing with (hopefully) invalid pointer %p\n", invalid_ptr);
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, mlock(invalid_ptr, page) == -1);
errno = 0;
ATF_REQUIRE_ERRNO(ENOMEM, munlock(invalid_ptr, page) == -1);
#endif
}
