/*
* Test SEAL_FUTURE_WRITE
* Test whether SEAL_FUTURE_WRITE actually prevents modifications.
*/
static void test_seal_future_write(void)
{
int fd, fd2;
void *p;
printf("%s SEAL-FUTURE-WRITE\n", memfd_str);
fd = mfd_assert_new("kern_memfd_seal_future_write",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
p = mfd_assert_mmap_shared(fd);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_FUTURE_WRITE);
mfd_assert_has_seals(fd, F_SEAL_FUTURE_WRITE);
/* read should pass, writes should fail */
mfd_assert_read(fd);
mfd_assert_read_shared(fd);
mfd_fail_write(fd);
fd2 = mfd_assert_reopen_fd(fd);
/* read should pass, writes should still fail */
mfd_assert_read(fd2);
mfd_assert_read_shared(fd2);
mfd_fail_write(fd2);
munmap(p, mfd_def_size);
close(fd2);
close(fd);
}
/*
* Test SEAL_WRITE
* Test whether SEAL_WRITE actually prevents modifications.
*/
static void test_seal_write(void)
{
int fd;
fd = mfd_assert_new("kern_memfd_seal_write",
MFD_DEF_SIZE,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_WRITE);
mfd_assert_read(fd);
mfd_fail_write(fd);
mfd_assert_shrink(fd);
mfd_assert_grow(fd);
mfd_fail_grow_write(fd);
close(fd);
}
/*
* Test SEAL_WRITE
* Test whether SEAL_WRITE actually prevents modifications.
*/
static void test_seal_write(void)
{
int fd;
printf("%s SEAL-WRITE\n", memfd_str);
fd = mfd_assert_new("kern_memfd_seal_write",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_WRITE);
mfd_assert_read(fd);
mfd_fail_write(fd);
mfd_assert_shrink(fd);
mfd_assert_grow(fd);
mfd_fail_grow_write(fd);
close(fd);
}