Refactors regmgr_call and privileges

src/kernel/src/fs/ioctl.rs

@@ -1,5 +1,7 @@
 use crate::errno::ENOTTY;
+use crate::syscalls::SysArg;
 use crate::syscalls::SysErr;
+use std::convert::Into;
 
 /// This macro does some compile time verification to ensure we don't mistype anything.
 /// It also ensures that we don't miss any commands, since [`IoCmd::try_from_raw_parts`] will panic with a todo! if it encounters an unknown command.
@@ -43,15 +45,17 @@ macro_rules! commands {
                 pub const IOC_OUT: u32 = 0x40000000;
                 pub const IOC_IN: u32 = 0x80000000;
 
-                pub fn try_from_raw_parts(cmd: u64, arg: *mut u8) -> Result<Self, SysErr> {
+                /// # Safety
+                /// `arg` has to be a pointer to the correct value
+                pub unsafe fn try_from_raw_parts(cmd: u64, arg: SysArg) -> Result<Self, SysErr> {
                     let cmd = cmd as u32;
 
                     if Self::is_invalid(cmd) {
                         return Err(SysErr::Raw(ENOTTY));
                     }
 
                     let cmd = match cmd {
-                        $( $value => Self::$variant $( ( unsafe { &mut *(arg as *mut $type) } ) )? ,)*
+                        $( $value => Self::$variant $( ( unsafe { &mut *(Into::<*mut $type>::into(arg)) } ) )? ,)*
                         _ => todo!("Unhandled ioctl command {:#x}", cmd)
                     };
 

src/kernel/src/fs/mod.rs

@@ -442,7 +442,7 @@ impl Fs {
     fn sys_ioctl(self: &Arc<Self>, td: &VThread, i: &SysIn) -> Result<SysOut, SysErr> {
         let fd: i32 = i.args[0].try_into().unwrap();
         // Our IoCmd contains both the command and the argument (if there is one).
-        let cmd = IoCmd::try_from_raw_parts(i.args[1].into(), i.args[2].into())?;
+        let cmd = unsafe { IoCmd::try_from_raw_parts(i.args[1].into(), i.args[2].into())? };
 
         info!("Executing ioctl({cmd:?}) on file descriptor {fd}.");
 

src/kernel/src/regmgr/command.rs

@@ -0,0 +1,38 @@
+use super::RegError;
+use crate::syscalls::SysArg;
+use std::convert::Into;
+
+#[repr(u32)]
+pub(super) enum RegMgrCommand<'a> {
+    SetInt(&'a SetIntArg) = 0x18,
+    Unk1(&'a Unk1Arg) = 0x19,
+}
+impl<'a> RegMgrCommand<'a> {
+    /// # Safety
+    /// `arg` has to be a pointer to the correct value
+    pub unsafe fn try_from_raw_parts(cmd: u32, arg: SysArg) -> Result<Self, RegError> {
+        match cmd {
+            0x18 => Ok(RegMgrCommand::SetInt(unsafe {
+                &*(Into::<*mut _>::into(arg))
+            })),
+            0x19 => Ok(RegMgrCommand::Unk1(unsafe {
+                &*(Into::<*mut _>::into(arg))
+            })),
+            0x27 | 0x40.. => Err(RegError::V800d0219),
+            v => todo!("RegMgrCommand({v})"),
+        }
+    }
+}
+
+#[repr(C)]
+pub(super) struct SetIntArg {
+    pub v1: u64,
+    pub v2: u32,
+    pub value: i32,
+}
+
+#[repr(C)]
+pub(super) struct Unk1Arg {
+    pub v1: u64,
+    pub v2: u32,
+}

src/kernel/src/regmgr/mod.rs

@@ -1,9 +1,8 @@
-pub use self::key::*;
-
+use self::command::*;
 use crate::errno::EINVAL;
 use crate::process::VThread;
 use crate::syscalls::{SysErr, SysIn, SysOut, Syscalls};
-use crate::ucred::Ucred;
+use crate::ucred::{Privilege, Ucred};
 use crate::{info, warn};
 use std::fmt::{Display, Formatter};
 use std::num::NonZeroI32;
@@ -12,6 +11,9 @@ use std::ptr::read;
 use std::sync::Arc;
 use thiserror::Error;
 
+pub use self::key::*;
+
+mod command;
 mod key;
 
 /// An implementation of PS4 registry manager.
@@ -31,28 +33,40 @@ impl RegMgr {
         // Get arguments.
         let op: u32 = i.args[0].try_into().unwrap();
         let buf: *mut i32 = i.args[2].into();
-        let req: *const u8 = i.args[3].into();
+        let req = i.args[3];
         let reqlen: usize = i.args[4].into();
 
-        // TODO: Check the result of priv_check(td, 682).
+        let td = VThread::current().unwrap();
+
+        td.cred().priv_check(Privilege::SCE682)?;
+
         if buf.is_null() {
             todo!("regmgr_call with buf = null");
         }
 
-        if req.is_null() {
+        if req == 0 {
             todo!("regmgr_call with req = null");
         }
 
         if reqlen > 2048 {
             todo!("regmgr_call with reqlen > 2048");
         }
 
+        let command = match unsafe { RegMgrCommand::try_from_raw_parts(op, req) } {
+            Ok(v) => v,
+            Err(e) => {
+                warn!(e, "regmgr_call({op}) failed");
+                unsafe { *buf = e.code() };
+                return Ok(SysOut::ZERO);
+            }
+        };
+
         // Execute the operation.
-        let r = match op {
-            0x18 => {
-                let v1 = unsafe { read::<u64>(req as _) };
-                let v2 = unsafe { read::<u32>(req.add(8) as _) };
-                let value = unsafe { read::<i32>(req.add(12) as _) };
+        let r = match command {
+            RegMgrCommand::SetInt(arg) => {
+                let v1 = arg.v1;
+                let v2 = arg.v2;
+                let value = arg.value;
 
                 info!(
                     "Attempting to set registry with v1: {}, v2: {}, value: {}.",
@@ -64,15 +78,13 @@ impl RegMgr {
                     self.set_int(k, value)
                 })
             }
-            0x19 => {
-                let v1 = unsafe { read::<u64>(req as _) };
-                let v2 = unsafe { read::<u32>(req.add(8) as _) };
+            RegMgrCommand::Unk1(arg) => {
+                let v1 = arg.v1;
+                let v2 = arg.v2;
 
                 self.decode_key(v1, v2, td.cred(), 1)
                     .and_then(|k| todo!("regmgr_call({op}) with matched key = {k}"))
             }
-            0x27 | 0x40.. => Err(RegError::V800d0219),
-            v => todo!("regmgr_call({v})"),
         };
 
         // Write the result.

src/kernel/src/ucred/mod.rs

@@ -99,6 +99,7 @@ impl Ucred {
             Privilege::MAXFILES
             | Privilege::PROC_SETLOGIN
             | Privilege::SCE680
+            | Privilege::SCE682
             | Privilege::SCE683
             | Privilege::SCE686 => self.is_system(),
             v => todo!("priv_check_cred(cred, {v})"),

src/kernel/src/ucred/privilege.rs

@@ -8,33 +8,37 @@ use std::fmt::{Display, Formatter};
 #[derive(Clone, Copy, PartialEq, Eq)]
 pub struct Privilege(i32);
 
-impl Privilege {
-    pub const MAXFILES: Self = Self(3);
-    pub const PROC_SETLOGIN: Self = Self(161);
-    pub const VFS_READ: Self = Self(310);
-    pub const VFS_WRITE: Self = Self(311);
-    pub const VFS_ADMIN: Self = Self(312);
-    pub const VFS_EXEC: Self = Self(313);
-    pub const VFS_LOOKUP: Self = Self(314);
-    pub const SCE680: Self = Self(680);
-    pub const SCE683: Self = Self(683);
-    pub const SCE686: Self = Self(686);
-}
+macro_rules! privileges {
+    ($($name:ident($value:expr)),*) => {
+        impl Privilege {
+            $(
+                pub const $name: Self = Self($value);
+            )*
+        }
 
-impl Display for Privilege {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        match *self {
-            Self::MAXFILES => f.write_str("PRIV_MAXFILES"),
-            Self::PROC_SETLOGIN => f.write_str("PRIV_PROC_SETLOGIN"),
-            Self::VFS_READ => f.write_str("PRIV_VFS_READ"),
-            Self::VFS_WRITE => f.write_str("PRIV_VFS_WRITE"),
-            Self::VFS_ADMIN => f.write_str("PRIV_VFS_ADMIN"),
-            Self::VFS_EXEC => f.write_str("PRIV_VFS_EXEC"),
-            Self::VFS_LOOKUP => f.write_str("PRIV_VFS_LOOKUP"),
-            Self::SCE680 => f.write_str("SCE680"),
-            Self::SCE683 => f.write_str("SCE683"),
-            Self::SCE686 => f.write_str("SCE686"),
-            v => v.0.fmt(f),
+        impl Display for Privilege {
+            fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+                match *self {
+                    $(
+                        Self($value) => f.write_str(stringify!($name)),
+                    )*
+                    v => v.0.fmt(f),
+                }
+            }
         }
     }
 }
+
+privileges! {
+    MAXFILES(3),
+    PROC_SETLOGIN(161),
+    VFS_READ(310),
+    VFS_WRITE(311),
+    VFS_ADMIN(312),
+    VFS_EXEC(313),
+    VFS_LOOKUP(314),
+    SCE680(680),
+    SCE682(682),
+    SCE683(683),
+    SCE686(686)
+}