Add permissions to the filesystem, preliminary permissions to the syscalls

syscall/src/data.rs

@@ -28,7 +28,10 @@ impl DerefMut for Event {
 #[derive(Copy, Clone, Debug, Default)]
 #[repr(packed)]
 pub struct Packet {
-    pub id: usize,
+    pub id: u64,
+    pub pid: usize,
+    pub uid: u32,
+    pub gid: u32,
     pub a: usize,
     pub b: usize,
     pub c: usize,

syscall/src/lib.rs

@@ -86,10 +86,18 @@ pub fn getcwd(buf: &mut [u8]) -> Result<usize> {
     unsafe { syscall2(SYS_GETCWD, buf.as_mut_ptr() as usize, buf.len()) }
 }
 
+pub fn getgid() -> Result<usize> {
+    unsafe { syscall0(SYS_GETGID) }
+}
+
 pub fn getpid() -> Result<usize> {
     unsafe { syscall0(SYS_GETPID) }
 }
 
+pub fn getuid() -> Result<usize> {
+    unsafe { syscall0(SYS_GETUID) }
+}
+
 pub unsafe fn iopl(level: usize) -> Result<usize> {
     syscall1(SYS_IOPL, level)
 }
@@ -142,6 +150,14 @@ pub fn rmdir(path: &str) -> Result<usize> {
     unsafe { syscall2(SYS_RMDIR, path.as_ptr() as usize, path.len()) }
 }
 
+pub fn setgid(gid: usize) -> Result<usize> {
+    unsafe { syscall1(SYS_SETGID, gid) }
+}
+
+pub fn setuid(uid: usize) -> Result<usize> {
+    unsafe { syscall1(SYS_SETUID, uid) }
+}
+
 pub fn unlink(path: &str) -> Result<usize> {
     unsafe { syscall2(SYS_UNLINK, path.as_ptr() as usize, path.len()) }
 }

syscall/src/number.rs

@@ -13,7 +13,9 @@ pub const SYS_FSYNC: usize = 118;
 pub const SYS_FTRUNCATE: usize = 93;
 pub const SYS_FUTEX: usize = 240;
 pub const SYS_GETCWD: usize = 183;
+pub const SYS_GETGID: usize = 200;
 pub const SYS_GETPID: usize = 20;
+pub const SYS_GETUID: usize = 199;
 pub const SYS_IOPL: usize = 110;
 pub const SYS_LINK: usize = 9;
 pub const SYS_LSEEK: usize = 19;
@@ -28,6 +30,8 @@ pub const SYS_VIRTTOPHYS: usize = 949;
 pub const SYS_PIPE2: usize = 331;
 pub const SYS_READ: usize = 3;
 pub const SYS_RMDIR: usize = 84;
+pub const SYS_SETGID: usize = 214;
+pub const SYS_SETUID: usize = 213;
 pub const SYS_UNLINK: usize = 10;
 pub const SYS_WAITPID: usize = 7;
 pub const SYS_WRITE: usize = 4;