Remove the shim kernel crate

kernel/src/syscall/setgroups.rs

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::SyscallReturn;
+use crate::{prelude::*, process::Gid};
+
+pub fn sys_setgroups(size: usize, group_list_addr: Vaddr, ctx: &Context) -> Result<SyscallReturn> {
+    debug!("size = {}, group_list_addr = 0x{:x}", size, group_list_addr);
+
+    // TODO: check perm: the calling process should have the CAP_SETGID capability
+
+    if size > NGROUPS_MAX {
+        return_errno_with_message!(Errno::EINVAL, "size cannot be greater than NGROUPS_MAX");
+    }
+
+    let mut new_groups = BTreeSet::new();
+    for idx in 0..size {
+        let addr = group_list_addr + idx * core::mem::size_of::<Gid>();
+        let gid = ctx.get_user_space().read_val(addr)?;
+        new_groups.insert(gid);
+    }
+
+    let credentials = ctx.posix_thread.credentials_mut();
+    *credentials.groups_mut() = new_groups;
+
+    Ok(SyscallReturn::Return(0))
+}
+
+const NGROUPS_MAX: usize = 65536;