pass all core-tests about socket

[DeathWish5]

Add right checks in socket and pass the rest core-tests (ReadIntoBadBuffer、WriteFromBadBuffer).
But there is some doubts about my change in zircon-syscall::vmar::sys_vmar_map.

// if !options.contains(VmOptions::PERM_READ)
//     && (!options.contains(VmOptions::PERM_WRITE)
//         || options.contains(VmOptions::PERM_EXECUTE))
// {
//     return Err(ZxError::INVALID_ARGS);
// }

I comment these codes which make sense because in core-tests of socket, an address is mapped as not readable, not writable and not executable, which should be ok but leads to errors due to the code above. However, a page with no rights is useless and only occurs in tests.

mapping_flags.set(
    MMUFlags::READ,
//  vmar_rights.contains(Rights::READ) && vmo_rights.contains(Rights::READ),
    vmar_rights.contains(Rights::READ) && vmo_rights.contains(Rights::READ) && options.contains(VmOptions::PERM_READ),
);
mapping_flags.set(
    MMUFlags::WRITE,
//  vmar_rights.contains(Rights::WRITE) && vmo_rights.contains(Rights::WRITE),
    vmar_rights.contains(Rights::WRITE) && vmo_rights.contains(Rights::WRITE) && options.contains(VmOptions::PERM_WRITE),
);
mapping_flags.set(
    MMUFlags::EXECUTE,
//  vmar_rights.contains(Rights::EXECUTE) && vmo_rights.contains(Rights::EXECUTE),
    vmar_rights.contains(Rights::EXECUTE) && vmo_rights.contains(Rights::EXECUTE) && options.contains(VmOptions::PERM_EXECUTE),
);

The implementation in zircon is same as zCore which doesn't care options and perm_xxxx. I am clear about the meanings of options::perm_xxxx, but without them, the rest core-tests will fail. (QAQ
😓😓😓😓

[coveralls]

Pull Request Test Coverage Report for Build 168743355

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 22 (0.0%) changed or added relevant lines in 4 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.004%) to 29.156%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
zircon-syscall/src/vmar.rs	0	3	0.0%
zircon-object/src/vm/vmar.rs	0	5	0.0%
zircon-object/src/ipc/socket.rs	0	7	0.0%
zircon-syscall/src/socket.rs	0	7	0.0%

Files with Coverage Reduction	New Missed Lines	%
zircon-object/src/object/mod.rs	1	81.55%

Totals
Change from base Build 166307932:	-0.004%
Covered Lines:	3490
Relevant Lines:	11970

---

💛 - Coveralls

[chyyuu]

need more work!