Merge pull request #7151 from Bonjourcestmatt/fix/socket-type-eprototype

fix(libkernel): return EPROTOTYPE for a socket type inet does not have

core/libs/prx/libkernel/Socket/src/Udp.cpp

@@ -948,7 +948,9 @@ int APS5_VABI socket_nid_postfix(int family, int type, int protocol) {
     if (family != 2 && family != 28) return Fail(47);
     const int nativeType = plainType == 1 ? SOCK_STREAM : plainType == 2 ? SOCK_DGRAM : -1;
     const int expectedProtocol = plainType == 1 ? 6 : 17;
-    if (nativeType == -1 || (protocol != 0 && protocol != expectedProtocol)) return Fail(43);
+    const bool inetKnowsType = plainType == 3 || plainType == 5;
+    if (nativeType == -1) return Fail(protocol == 0 && plainType != 0 && !inetKnowsType ? 41 : 43);
+    if (protocol != 0 && protocol != expectedProtocol) return Fail(43);
 #ifdef _WIN32
     static const int startup = [] { WSADATA data{}; return WSAStartup(MAKEWORD(2, 2), &data); }();
     if (startup) return Fail(5);

core/libs/tests/GuestSocketDescriptors.cpp

@@ -181,7 +181,24 @@ static void DuplicateKeepsSocket() {
     Require(close_nid_postfix(sender) == 0);
 }
 
+static void SocketTypeErrors() {
+    constexpr int PrototypeError = 41;
+    constexpr int ProtocolError = 43;
+    constexpr int FamilyError = 47;
+    constexpr int Inet6 = 28;
+    for (const int family : {Inet, Inet6}) {
+        Require(socket_nid_postfix(family, 99, 0) == -1 && *__error_nid_postfix() == PrototypeError);
+        Require(socket_nid_postfix(family, 4, 0) == -1 && *__error_nid_postfix() == PrototypeError);
+        Require(socket_nid_postfix(family, 0, 0) == -1 && *__error_nid_postfix() == ProtocolError);
+        Require(socket_nid_postfix(family, 99, 6) == -1 && *__error_nid_postfix() == ProtocolError);
+        Require(socket_nid_postfix(family, 1, 17) == -1 && *__error_nid_postfix() == ProtocolError);
+        Require(socket_nid_postfix(family, 2, 6) == -1 && *__error_nid_postfix() == ProtocolError);
+    }
+    Require(socket_nid_postfix(99, 1, 0) == -1 && *__error_nid_postfix() == FamilyError);
+}
+
 int main() {
+    SocketTypeErrors();
     SelectSocketAndFile();
     CloseReleasesNumber();
     DuplicateKeepsSocket();

docs/dev/debt/libkernel.md

@@ -179,6 +179,7 @@
 - [madvise](../../../core/libs/prx/libkernel/DirectMemory/PosixMemory.cpp) (libkernel) accepts `MADV_PROTECT` (10) as a no-op hint without modifying process protection. FreeBSD 11's `kern_madvise` (`sys/vm/vm_mmap.c`) handles it before the address check, ignores the address and length, and calls `kern_procctl(..., PROC_SPROTECT, PPROT_SET)`, which requires `PRIV_VM_MADV_PROTECT` and fails with `EPERM` without it. Returning 0 unconditionally assumes the calling process is privileged. Console behaviour is unverified
 - [mincore](../../../core/libs/prx/libkernel/DirectMemory/PosixMemory.cpp) (libkernel) follows FreeBSD 11's `sys_mincore` (`sys/vm/vm_mmap.c`), not measured on the console: the address is rounded down to the page, length 0 returns 0, a null vector over a mapped range returns `EFAULT`, an overflowing range or any unmapped page in the range (as reported by `sceKernelVirtualQuery`) returns `ENOMEM`. For valid ranges, a page reports `MINCORE_INCORE` (0x1) when `sceKernelVirtualQuery` reports it committed and 0 when it is only reserved; actual residency, referenced and modified bits are not modelled. Length 0 returns 0 when the start page is mapped and `ENOMEM` otherwise, and the range and mapping checks come before the null vector `EFAULT`, as in `kern_mincore` Java 25 LAN / DNS (PPSA99869) imports it
 - [mlockall, munlockall](../../../core/libs/prx/libkernel/DirectMemory/PosixMemory.cpp) (libkernel) - `mlockall` returns `EINVAL` for zero or unknown flags. Valid `MCL_CURRENT` throws because it would lock host stacks, heaps, modules and driver mappings along with guest memory; `MCL_FUTURE` throws because later mappings are not tracked for locking. FreeBSD 11.4's `sys_munlockall` (`sys/vm/vm_mmap.c`:1133-1165) checks `priv_check(td, PRIV_VM_MUNLOCK)` first (returning `EPERM` without it) and unwires the user map (`vm_map_unwire` over `vm_map_min`...`vm_map_max` with `VM_MAP_WIRE_HOLESOK`). Returning 0 unconditionally assumes the calling process is privileged. `munlockall` unlocks memory locked by `mlock` (`VirtualUnlock` on Windows, tolerating `ERROR_NOT_LOCKED` for pages never locked, and `munlockall` on Linux). On main, XPSemu (PPSA97358) fails to load at these imports (mlockall #4386, munlockall); their calls in QEMU `os-posix.c` execute only when `-overcommit mem-lock=on` is enabled. The call has not been observed in a run with this implementation.
+- [socket](../../../core/libs/prx/libkernel/Socket/src/Udp.cpp) (libkernel) creates only `SOCK_STREAM` and `SOCK_DGRAM` sockets in `AF_INET` and `AF_INET6`. A type that FreeBSD 11.4's inet domain has no protocol for in any configuration ([`in_proto.c`](https://github.com/freebsd/freebsd-src/blob/release/11.4.0/sys/netinet/in_proto.c) has no `SOCK_RDM` entry and no unknown type) fails with `EPROTOTYPE` when the protocol is 0 and `EPROTONOSUPPORT` otherwise, as [`socreate`](https://github.com/freebsd/freebsd-src/blob/release/11.4.0/sys/kern/uipc_socket.c) does. `SOCK_RAW`, which `in_proto.c` always has (`socreate` creates it for a privileged process), and `SOCK_SEQPACKET`, which it has only in a kernel built with `SCTP`, fail with `EPROTONOSUPPORT`; whether the console allows either is not known. `SOCK_DGRAM` with `IPPROTO_UDPLITE` and `AF_UNIX` (`socketpair` supports it) fail with `EPROTONOSUPPORT` and `EAFNOSUPPORT` where FreeBSD creates the socket
 - [sigtimedwait](../../../core/libs/prx/libkernel/System/src/Signals.cpp) (libkernel) waits on a process-wide pending set instead of throwing: a signal raised while blocked stays pending and is taken by `sigwait`, `sigwaitinfo` or `sigtimedwait`, delivered to the handler when `_sigprocmask` unblocks it, or delivered by `pause`. The set covers all 128 signals and the lowest number that is pending and in the set is selected (FreeBSD specifies the lowest number only among real-time signals). Selection, `EAGAIN` on timeout, `EINVAL` for a `tv_nsec` outside 0 to 1000000000 while nothing is pending and `NULL` timeout blocking indefinitely follow FreeBSD's [sigtimedwait(2)](https://man.freebsd.org/cgi/man.cgi?query=sigtimedwait). `sigwait` returns 0 with the number in its output, as POSIX specifies, and `sigwaitinfo` and `sigtimedwait` return the number, as FreeBSD does. The guest `siginfo_t` follows FreeBSD 11's `sys/sys/siginfo.h`: 80 bytes, `si_signo` at 0, `si_code` at 8, `si_pid` at 12, `si_uid` at 16, `si_addr` at 24, `si_value` at 32 and `si_band` at 40; only `si_signo`, `si_code` (`SI_USER`) and `si_pid` (the guest pid) are written, `si_uid` stays 0 because no uid is modelled, and the console's layout is not verified. PPSA85300 imports `sigtimedwait` and fails to load without it; its only call site is VLC's `vlc_writev` ([filesystem.c](https://github.com/videolan/vlc/blob/6de05adcbaf2e8b85fe86aad4169393098628119/src/posix/filesystem.c#L243-L278)), which polls with a zero timeout to drain a `SIGPIPE` only after `writev` fails with `EPIPE`. The waits are not cancellation points and an unblocked caught signal does not interrupt them with `EINTR`, where FreeBSD's `sigwaitinfo` and `sigtimedwait` may return it. `SIGPIPE` has no host equivalent and is never raised by a host write here (see `read, write and vector I/O`), so VLC's drain finds nothing
 - [pause, sigsuspend, sigwait, sigwaitinfo](../../../core/libs/prx/libkernel/System/src/Signals.cpp) (libkernel) take the pending set of `sigtimedwait` instead of throwing. `pause` waits for a pending signal that is not blocked and whose disposition can be delivered, runs its handler on the calling thread and returns -1 with `EINTR`; an ignored signal is discarded and the wait continues, and it never returns for a signal whose handler cannot run. A signal whose registered handler has `SA_SIGINFO` still throws, and one whose disposition is the default action and that has no host equivalent (every signal except 2, 4, 6, 8, 11 and 15) is neither delivered nor discarded: it stays pending until a wait takes it, where FreeBSD runs the default action, which terminates the process for most of them. PPSA68091, PPSA99169, PPSA99420 and PPSA97358 import them and fail to load without them. PPSA68091 calls `pause` at one site (0x8F7266), in a loop that waits while a global holds another thread's `errno` address. PPSA99169 only stores the address of `pause` in a table of symbol addresses (0x30DB1). PPSA99420 calls `pause` at 0x3BD80F6 and 0x3C9E220, `sigwait` at 0x3C9E4C7 and `sigwaitinfo` at 0x3C9E588. PPSA97358 calls `sigwait` from QEMU's `sigwait_compat` thread ([compatfd.c](https://github.com/ZiZc3/XPSemu/blob/8eec07b4e31f66dce8e0b05c1ca1281af303e933/util/compatfd.c#L28-L53)), which `qemu_signal_init` ([main-loop.c](https://github.com/ZiZc3/XPSemu/blob/8eec07b4e31f66dce8e0b05c1ca1281af303e933/util/main-loop.c#L110-L147)) starts for `SIGIO`, `SIGALRM` and `SIGBUS` when the main loop is created, so it reaches the wait at start-up, and from the vCPU thread of the dummy accelerator ([dummy-cpus.c](https://github.com/ZiZc3/XPSemu/blob/8eec07b4e31f66dce8e0b05c1ca1281af303e933/accel/dummy-cpus.c#L48-L56)). `sigsuspend` swaps the process-wide mask of `_sigprocmask` for its argument, waits as `pause` does through the same helper, then restores the mask through `_sigprocmask`, and returns -1 with `EINTR`; a null set throws, as the console faults in libthr instead of returning `EFAULT`. All four words of the argument replace the mask and are restored afterwards, as in `_sigprocmask`. Java 25 LAN / DNS (PPSA99869, #5501) imports it and fails to load without it, after `sysctlnametomib`, `fegetenv` and `mincore`. None of the five waits is a cancellation point
 - [getsid](../../../core/libs/prx/libkernel/System/src/Process.cpp) (libkernel) returns the calling process ID for pid 0 and the calling process, and `ESRCH` for other process IDs, assuming the single guest process is its own session leader. PPSA74126 imports it and fails to load without it