ksud: Add cli interface for nuke_ext4_sysfs

userspace/ksud/src/ksucalls.rs

@@ -17,6 +17,7 @@ const KSU_IOCTL_GET_FEATURE: u32 = 0xc0004b0d; // _IOC(_IOC_READ|_IOC_WRITE, 'K'
 const KSU_IOCTL_SET_FEATURE: u32 = 0x40004b0e; // _IOC(_IOC_WRITE, 'K', 14, 0)
 const KSU_IOCTL_GET_WRAPPER_FD: u32 = 0x40004b0f; // _IOC(_IOC_WRITE, 'K', 15, 0)
 const KSU_IOCTL_MANAGE_MARK: u32 = 0xc0004b10; // _IOC(_IOC_READ|_IOC_WRITE, 'K', 16, 0)
+const KSU_IOCTL_NUKE_EXT4_SYSFS: u32 = 0xc0004b11; // _IOC(_IOC_READ|_IOC_WRITE, 'K', 17, 0)
 
 #[repr(C)]
 #[derive(Clone, Copy, Default)]
@@ -73,6 +74,12 @@ struct ManageMarkCmd {
     result: u32,
 }
 
+#[repr(C)]
+#[derive(Clone, Copy, Default)]
+pub struct NukeExt4SysfsCmd {
+    pub arg: u64,
+}
+
 // Mark operation constants
 const KSU_MARK_GET: u32 = 1;
 const KSU_MARK_MARK: u32 = 2;
@@ -294,3 +301,12 @@ pub fn mark_refresh() -> std::io::Result<()> {
     ksuctl(KSU_IOCTL_MANAGE_MARK, &mut cmd as *mut _)?;
     Ok(())
 }
+
+pub fn nuke_ext4_sysfs(mnt: &str) -> anyhow::Result<()> {
+    let c_mnt = std::ffi::CString::new(mnt)?;
+    let mut ioctl_cmd = NukeExt4SysfsCmd {
+        arg: c_mnt.as_ptr() as u64,
+    };
+    ksuctl(KSU_IOCTL_NUKE_EXT4_SYSFS, &mut ioctl_cmd as *mut _)?;
+    Ok(())
+}