Revert "ksud: try parse kmi from gki modules if uname is modified"

This reverts commit f41d73f.

userspace/ksud/src/boot_patch.rs

@@ -49,49 +49,21 @@ pub fn get_kernel_version() -> Result<(i32, i32, i32)> {
 }
 
 #[cfg(target_os = "android")]
-fn parse_kmi(version: &str) -> Result<String> {
+fn parse_kmi() -> Result<String> {
     use regex::Regex;
+    let uname = rustix::system::uname();
+    let version = uname.release().to_string_lossy();
     let re = Regex::new(r"(.* )?(\d+\.\d+)(\S+)?(android\d+)(.*)")?;
     let cap = re
-        .captures(version)
+        .captures(&version)
         .ok_or_else(|| anyhow::anyhow!("Failed to get KMI from boot/modules"))?;
     let android_version = cap.get(4).map_or("", |m| m.as_str());
     let kernel_version = cap.get(2).map_or("", |m| m.as_str());
     Ok(format!("{android_version}-{kernel_version}"))
 }
 
-#[cfg(target_os = "android")]
-fn parse_kmi_from_uname() -> Result<String> {
-    let uname = rustix::system::uname();
-    let version = uname.release().to_string_lossy();
-    parse_kmi(&version)
-}
-
-#[cfg(target_os = "android")]
-fn parse_kmi_from_modules() -> Result<String> {
-    use std::io::BufRead;
-    // find a *.ko in /vendor/lib/modules
-    let modfile = std::fs::read_dir("/vendor/lib/modules")?
-        .filter_map(Result::ok)
-        .find(|entry| entry.path().extension().map_or(false, |ext| ext == "ko"))
-        .map(|entry| entry.path())
-        .ok_or_else(|| anyhow!("No kernel module found"))?;
-    let output = Command::new("modinfo").arg(modfile).output()?;
-    for line in output.stdout.lines().map_while(Result::ok) {
-        if line.starts_with("vermagic") {
-            return parse_kmi(&line);
-        }
-    }
-    anyhow::bail!("Parse KMI from modules failed")
-}
-
-#[cfg(target_os = "android")]
-pub fn get_current_kmi() -> Result<String> {
-    parse_kmi_from_uname().or_else(|_| parse_kmi_from_modules())
-}
-
 #[cfg(not(target_os = "android"))]
-pub fn get_current_kmi() -> Result<String> {
+pub fn parse_kmi() -> Result<String> {
     bail!("Unsupported platform")
 }
 
@@ -324,7 +296,7 @@ fn do_patch(
         let kmi = if let Some(kmi) = kmi {
             kmi
         } else {
-            get_current_kmi().context("Unknown KMI, please choose LKM manually")?
+            parse_kmi()?
         };
         println!("- KMI: {kmi}");
         let name = format!("{kmi}_kernelsu.ko");