fix: support endianess + old format for parsing ld.so.cache

I also added tests fixtures as can be found in my repo here: https://github.com/EKTehtris/ld_cache_rs

aya/src/programs/uprobe.rs

@@ -1,24 +1,23 @@
 //! User space probes.
-use libc::pid_t;
-use object::{Object, ObjectSymbol};
 use std::{
     error::Error,
-    ffi::CStr,
     fs,
     io::{self, BufRead, Cursor, Read},
     mem,
-    os::raw::c_char,
     path::{Path, PathBuf},
     sync::Arc,
 };
+
+use libc::pid_t;
+use object::{Object, ObjectSymbol};
 use thiserror::Error;
 
 use crate::{
     generated::bpf_prog_type::BPF_PROG_TYPE_KPROBE,
     programs::{
+        LinkRef,
         load_program,
-        probe::{attach, ProbeKind},
-        LinkRef, ProgramData, ProgramError,
+        probe::{attach, ProbeKind}, ProgramData, ProgramError,
     },
 };
 
@@ -29,6 +28,7 @@ lazy_static! {
         LdSoCache::load(LD_SO_CACHE_FILE).map_err(Arc::new);
 }
 const LD_SO_CACHE_HEADER: &str = "glibc-ld.so.cache1.1";
+const LD_SO_CACHE_HEADER_OLD: &str = "ld.so-1.7.0";
 
 /// An user space probe.
 ///
@@ -108,7 +108,7 @@ impl UProbe {
                         })?;
                 cache.resolve(target_str)
             }
-            .map(String::from)
+                .map(String::from)
         };
 
         let path = path.ok_or(UProbeError::InvalidTarget {
@@ -196,8 +196,8 @@ fn find_lib_in_proc_maps(pid: pid_t, lib: &str) -> Result<Option<String>, io::Er
 
 #[derive(Debug)]
 pub(crate) struct CacheEntry {
-    key: String,
-    value: String,
+    lib_name: String,
+    path: String,
     flags: i32,
 }
 
@@ -206,66 +206,117 @@ pub(crate) struct LdSoCache {
     entries: Vec<CacheEntry>,
 }
 
+#[allow(unused)]
+#[derive(Copy, Clone, Debug)]
+pub enum TargetEndian {
+    Native,
+    Big,
+    Little,
+}
+
 impl LdSoCache {
     pub fn load<T: AsRef<Path>>(path: T) -> Result<Self, io::Error> {
         let data = fs::read(path)?;
-        Self::parse(&data)
+        Self::parse(&data, TargetEndian::Native)
     }
 
-    fn parse(data: &[u8]) -> Result<Self, io::Error> {
+    fn parse(data: &[u8], endianness: TargetEndian) -> Result<Self, io::Error> {
         let mut cursor = Cursor::new(data);
 
         let read_u32 = |cursor: &mut Cursor<_>| -> Result<u32, io::Error> {
             let mut buf = [0u8; mem::size_of::<u32>()];
             cursor.read_exact(&mut buf)?;
 
-            Ok(u32::from_ne_bytes(buf))
+            Ok(match endianness {
+                TargetEndian::Native => u32::from_ne_bytes(buf),
+                TargetEndian::Big => u32::from_be_bytes(buf),
+                TargetEndian::Little => u32::from_le_bytes(buf),
+            })
         };
 
         let read_i32 = |cursor: &mut Cursor<_>| -> Result<i32, io::Error> {
             let mut buf = [0u8; mem::size_of::<i32>()];
             cursor.read_exact(&mut buf)?;
-
-            Ok(i32::from_ne_bytes(buf))
+            Ok(match endianness {
+                TargetEndian::Native => i32::from_ne_bytes(buf),
+                TargetEndian::Big => i32::from_be_bytes(buf),
+                TargetEndian::Little => i32::from_le_bytes(buf),
+            })
         };
 
         let mut buf = [0u8; LD_SO_CACHE_HEADER.len()];
+        let mut buf_old = [0u8; LD_SO_CACHE_HEADER_OLD.len()];
         cursor.read_exact(&mut buf)?;
-        let header = std::str::from_utf8(&buf).or(Err(io::Error::new(
-            io::ErrorKind::InvalidData,
-            "invalid ld.so.cache header",
-        )))?;
+        cursor.set_position(0);
+        cursor.read_exact(&mut buf_old)?;
+        let header = std::str::from_utf8(&buf).or(
+            std::str::from_utf8(&buf_old).or(
+                Err(io::Error::new(
+                    io::ErrorKind::InvalidData,
+                    "invalid ld.so.cache header",
+                ))
+            )
+        )?;
+        let mut is_old: bool = false;
         if header != LD_SO_CACHE_HEADER {
-            return Err(io::Error::new(
-                io::ErrorKind::InvalidData,
-                "invalid ld.so.cache header",
-            ));
+            if header != LD_SO_CACHE_HEADER_OLD {
+                return Err(io::Error::new(
+                    io::ErrorKind::InvalidData,
+                    "invalid ld.so.cache header",
+                ));
+            } else {
+                is_old = true;
+                // add a padding corresponding to LD_SO_CACHE_HEADER_OLD
+                // size 11 + 1 to align on 12 bytes or 3*4 bounds
+                cursor.consume(1)
+            }
+        } else {
+            // we have to reset the position since we found the new header
+            cursor.set_position(LD_SO_CACHE_HEADER.len() as u64);
         }
 
-        let num_entries = read_u32(&mut cursor)?;
-        let _str_tab_len = read_u32(&mut cursor)?;
-        cursor.consume(5 * mem::size_of::<u32>());
+        let num_entries: u32 = read_u32(&mut cursor)?;
+        let mut string_table_offset: usize = 0;
+        if !is_old {
+            let _str_tab_len = read_u32(&mut cursor)?;
+            // those are as of glibc 2.33 (flags u8, empty 3xu8, extension_offset u32, unused 3xu32)
+            cursor.consume(5 * mem::size_of::<u32>());
+        } else {
+            // only 3 u32 were present in the old entries
+            string_table_offset = cursor.position() as usize + num_entries as usize * mem::size_of::<u32>() * 3;
+        }
 
         let mut entries = Vec::new();
         for _ in 0..num_entries {
             let flags = read_i32(&mut cursor)?;
             let k_pos = read_u32(&mut cursor)? as usize;
             let v_pos = read_u32(&mut cursor)? as usize;
-            cursor.consume(12);
-            let key =
-                unsafe { CStr::from_ptr(cursor.get_ref()[k_pos..].as_ptr() as *const c_char) }
-                    .to_string_lossy()
-                    .into_owned();
-            let value =
-                unsafe { CStr::from_ptr(cursor.get_ref()[v_pos..].as_ptr() as *const c_char) }
-                    .to_string_lossy()
-                    .into_owned();
-            entries.push(CacheEntry { key, value, flags });
+            if !is_old {
+                // those are as of glibc 2.33 (os_version u32, hwcap u64)
+                cursor.consume(mem::size_of::<u32>() + mem::size_of::<u64>());
+            }
+            let key = Self::str_from_u8_nul_utf8(&cursor.get_ref()[k_pos + string_table_offset..]).map_err(|e| io::Error::new(
+                io::ErrorKind::InvalidData,
+                format!("Invalid ut8 string : {}", e),
+            ))?.to_owned();
+            let value = Self::str_from_u8_nul_utf8(&cursor.get_ref()[v_pos + string_table_offset..]).map_err(|e| io::Error::new(
+                io::ErrorKind::InvalidData,
+                format!("Invalid ut8 string : {}", e),
+            ))?.to_owned();
+            entries.push(CacheEntry { lib_name: key, path: value, flags });
         }
 
         Ok(LdSoCache { entries })
     }
 
+    pub fn str_from_u8_nul_utf8(utf8_src: &[u8]) -> Result<&str, std::str::Utf8Error> {
+        let nul_range_end = utf8_src
+            .iter()
+            .position(|&c| c == b'\0')
+            .unwrap_or(utf8_src.len()); // default to length if no `\0` present
+        ::std::str::from_utf8(&utf8_src[0..nul_range_end])
+    }
+
     pub fn resolve(&self, lib: &str) -> Option<&str> {
         let lib = if !lib.contains(".so") {
             lib.to_string() + ".so"
@@ -274,8 +325,8 @@ impl LdSoCache {
         };
         self.entries
             .iter()
-            .find(|entry| entry.key.starts_with(&lib))
-            .map(|entry| entry.value.as_str())
+            .find(|entry| entry.lib_name.starts_with(&lib))
+            .map(|entry| entry.path.as_str())
     }
 }
 
@@ -301,3 +352,62 @@ fn resolve_symbol(path: &str, symbol: &str) -> Result<u64, ResolveSymbolError> {
         .map(|s| s.address())
         .ok_or_else(|| ResolveSymbolError::Unknown(symbol.to_string()))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_big_endian_old_format_s390x() {
+        let data = include_bytes!("../../tests/fixtures/ld.so.cache_s390x_old");
+        let cache = LdSoCache::parse(data, TargetEndian::Big);
+        assert!(cache.is_ok());
+        let cache = cache.unwrap();
+        assert_eq!(cache.entries.len(), 188);
+        let strings: &str = include_str!("../../tests/fixtures/s390x.strings");
+        test_entries(strings, cache);
+    }
+
+    #[test]
+    fn test_little_endian_new_format_mips() {
+        let data = include_bytes!("../../tests/fixtures/ld.so.cache_mips");
+        let cache = LdSoCache::parse(data, TargetEndian::Little);
+        assert!(cache.is_ok());
+        let cache = cache.unwrap();
+        assert_eq!(cache.entries.len(), 2407);
+        let strings: &str = include_str!("../../tests/fixtures/mips.strings");
+        test_entries(strings, cache);
+    }
+
+    #[test]
+    fn test_little_endian_new_format_debian_x86_64() {
+        let data = include_bytes!("../../tests/fixtures/ld.so.cache_debian");
+        let cache = LdSoCache::parse(data, TargetEndian::Little);
+        assert!(cache.is_ok());
+        let cache = cache.unwrap();
+        assert_eq!(cache.entries.len(), 81);
+        let strings: &str = include_str!("../../tests/fixtures/debian.strings");
+        test_entries(strings, cache);
+    }
+
+    #[test]
+    fn test_little_endian_old_format_debian_x86_64() {
+        let data = include_bytes!("../../tests/fixtures/ld.so.cache_debian_old");
+        let cache = LdSoCache::parse(data, TargetEndian::Little);
+        assert!(cache.is_ok());
+        let cache = cache.unwrap();
+        assert_eq!(cache.entries.len(), 148);
+        let strings: &str = include_str!("../../tests/fixtures/debian_old.strings");
+        test_entries(strings, cache);
+    }
+
+    fn test_entries(strings: &str, cache: LdSoCache) {
+        for string in strings.split_terminator("\n") {
+            let (lib_name, path) = string.split_once(" ").unwrap();
+            assert!(cache.entries.iter().any(|x| x.lib_name == lib_name), "lib name : {} was not inside the entries", lib_name);
+            let found_paths: Vec<&CacheEntry> = cache.entries.iter().filter(|e| e.lib_name == lib_name).collect();
+            assert!(!found_paths.is_empty(), "Path was not found for lib name : {}", lib_name);
+            assert!(found_paths.iter().any(|e| e.path == path), "lib path : {} was not correct, got {:?}", path, found_paths);
+        }
+    }
+}

aya/tests/fixtures/debian.strings

@@ -0,0 +1,81 @@
+libzstd.so.1 /lib/x86_64-linux-gnu/libzstd.so.1
+libz.so.1 /lib/x86_64-linux-gnu/libz.so.1
+libuuid.so.1 /lib/x86_64-linux-gnu/libuuid.so.1
+libutil.so.1 /lib/x86_64-linux-gnu/libutil.so.1
+libunistring.so.2 /lib/x86_64-linux-gnu/libunistring.so.2
+libudev.so.1 /lib/x86_64-linux-gnu/libudev.so.1
+libtinfo.so.6 /lib/x86_64-linux-gnu/libtinfo.so.6
+libtic.so.6 /lib/x86_64-linux-gnu/libtic.so.6
+libthread_db.so.1 /lib/x86_64-linux-gnu/libthread_db.so.1
+libtasn1.so.6 /lib/x86_64-linux-gnu/libtasn1.so.6
+libsystemd.so.0 /lib/x86_64-linux-gnu/libsystemd.so.0
+libstdc++.so.6 /lib/x86_64-linux-gnu/libstdc++.so.6
+libss.so.2 /lib/x86_64-linux-gnu/libss.so.2
+libsmartcols.so.1 /lib/x86_64-linux-gnu/libsmartcols.so.1
+libsepol.so.1 /lib/x86_64-linux-gnu/libsepol.so.1
+libsemanage.so.1 /lib/x86_64-linux-gnu/libsemanage.so.1
+libselinux.so.1 /lib/x86_64-linux-gnu/libselinux.so.1
+libseccomp.so.2 /lib/x86_64-linux-gnu/libseccomp.so.2
+librt.so.1 /lib/x86_64-linux-gnu/librt.so.1
+libresolv.so.2 /lib/x86_64-linux-gnu/libresolv.so.2
+libp11-kit.so.0 /lib/x86_64-linux-gnu/libp11-kit.so.0
+libpthread.so.0 /lib/x86_64-linux-gnu/libpthread.so.0
+libprocps.so.8 /lib/x86_64-linux-gnu/libprocps.so.8
+libpcre2-8.so.0 /lib/x86_64-linux-gnu/libpcre2-8.so.0
+libpcreposix.so.3 /lib/x86_64-linux-gnu/libpcreposix.so.3
+libpcre.so.3 /lib/x86_64-linux-gnu/libpcre.so.3
+libpcprofile.so /lib/x86_64-linux-gnu/libpcprofile.so
+libpanelw.so.6 /lib/x86_64-linux-gnu/libpanelw.so.6
+libpanel.so.6 /lib/x86_64-linux-gnu/libpanel.so.6
+libpamc.so.0 /lib/x86_64-linux-gnu/libpamc.so.0
+libpam_misc.so.0 /lib/x86_64-linux-gnu/libpam_misc.so.0
+libpam.so.0 /lib/x86_64-linux-gnu/libpam.so.0
+libnss_nisplus.so.2 /lib/x86_64-linux-gnu/libnss_nisplus.so.2
+libnss_nis.so.2 /lib/x86_64-linux-gnu/libnss_nis.so.2
+libnss_hesiod.so.2 /lib/x86_64-linux-gnu/libnss_hesiod.so.2
+libnss_files.so.2 /lib/x86_64-linux-gnu/libnss_files.so.2
+libnss_dns.so.2 /lib/x86_64-linux-gnu/libnss_dns.so.2
+libnss_compat.so.2 /lib/x86_64-linux-gnu/libnss_compat.so.2
+libnsl.so.1 /lib/x86_64-linux-gnu/libnsl.so.1
+libnettle.so.7 /lib/x86_64-linux-gnu/libnettle.so.7
+libncursesw.so.6 /lib/x86_64-linux-gnu/libncursesw.so.6
+libncurses.so.6 /lib/x86_64-linux-gnu/libncurses.so.6
+libmvec.so.1 /lib/x86_64-linux-gnu/libmvec.so.1
+libmount.so.1 /lib/x86_64-linux-gnu/libmount.so.1
+libmenuw.so.6 /lib/x86_64-linux-gnu/libmenuw.so.6
+libmenu.so.6 /lib/x86_64-linux-gnu/libmenu.so.6
+libmemusage.so /lib/x86_64-linux-gnu/libmemusage.so
+libm.so.6 /lib/x86_64-linux-gnu/libm.so.6
+liblz4.so.1 /lib/x86_64-linux-gnu/liblz4.so.1
+liblzma.so.5 /lib/x86_64-linux-gnu/liblzma.so.5
+libidn2.so.0 /lib/x86_64-linux-gnu/libidn2.so.0
+libhogweed.so.5 /lib/x86_64-linux-gnu/libhogweed.so.5
+libgpg-error.so.0 /lib/x86_64-linux-gnu/libgpg-error.so.0
+libgnutls.so.30 /lib/x86_64-linux-gnu/libgnutls.so.30
+libgmp.so.10 /lib/x86_64-linux-gnu/libgmp.so.10
+libgcrypt.so.20 /lib/x86_64-linux-gnu/libgcrypt.so.20
+libgcc_s.so.1 /lib/x86_64-linux-gnu/libgcc_s.so.1
+libformw.so.6 /lib/x86_64-linux-gnu/libformw.so.6
+libform.so.6 /lib/x86_64-linux-gnu/libform.so.6
+libffi.so.7 /lib/x86_64-linux-gnu/libffi.so.7
+libfdisk.so.1 /lib/x86_64-linux-gnu/libfdisk.so.1
+libe2p.so.2 /lib/x86_64-linux-gnu/libe2p.so.2
+libext2fs.so.2 /lib/x86_64-linux-gnu/libext2fs.so.2
+libdl.so.2 /lib/x86_64-linux-gnu/libdl.so.2
+libdebconfclient.so.0 /lib/x86_64-linux-gnu/libdebconfclient.so.0
+libdb-5.3.so /lib/x86_64-linux-gnu/libdb-5.3.so
+libcrypt.so.1 /lib/x86_64-linux-gnu/libcrypt.so.1
+libcom_err.so.2 /lib/x86_64-linux-gnu/libcom_err.so.2
+libcap-ng.so.0 /lib/x86_64-linux-gnu/libcap-ng.so.0
+libc.so.6 /lib/x86_64-linux-gnu/libc.so.6
+libbz2.so.1.0 /lib/x86_64-linux-gnu/libbz2.so.1.0
+libblkid.so.1 /lib/x86_64-linux-gnu/libblkid.so.1
+libaudit.so.1 /lib/x86_64-linux-gnu/libaudit.so.1
+libattr.so.1 /lib/x86_64-linux-gnu/libattr.so.1
+libapt-private.so.0.0 /lib/x86_64-linux-gnu/libapt-private.so.0.0
+libapt-pkg.so.6.0 /lib/x86_64-linux-gnu/libapt-pkg.so.6.0
+libanl.so.1 /lib/x86_64-linux-gnu/libanl.so.1
+libacl.so.1 /lib/x86_64-linux-gnu/libacl.so.1
+libSegFault.so /lib/x86_64-linux-gnu/libSegFault.so
+libBrokenLocale.so.1 /lib/x86_64-linux-gnu/libBrokenLocale.so.1
+ld-linux-x86-64.so.2 /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2

aya/tests/fixtures/debian_old.strings

@@ -0,0 +1,148 @@
+libz.so.1 /lib64/libz.so.1
+libxml2.so.2 /usr/lib64/libxml2.so.2
+libverto.so.0 /usr/lib64/libverto.so.0
+libverto.so /usr/lib64/libverto.so
+libverto-k5ev.so.0 /usr/lib64/libverto-k5ev.so.0
+libverto-k5ev.so /usr/lib64/libverto-k5ev.so
+libuuid.so.1 /lib64/libuuid.so.1
+libutil.so.1 /lib64/libutil.so.1
+libutempter.so.0 /usr/lib64/libutempter.so.0
+libustr-1.0.so.1 /usr/lib64/libustr-1.0.so.1
+libuser.so.1 /usr/lib64/libuser.so.1
+libusbpp-0.1.so.4 /usr/lib64/libusbpp-0.1.so.4
+libusb-0.1.so.4 /usr/lib64/libusb-0.1.so.4
+libtinfo.so.5 /lib64/libtinfo.so.5
+libtic.so.5 /usr/lib64/libtic.so.5
+libthread_db.so.1 /lib64/libthread_db.so.1
+libtasn1.so.3 /usr/lib64/libtasn1.so.3
+libstdc++.so.6 /usr/lib64/libstdc++.so.6
+libssl3.so /usr/lib64/libssl3.so
+libssl.so.10 /usr/lib64/libssl.so.10
+libssh2.so.1 /usr/lib64/libssh2.so.1
+libsqlite3.so.0 /usr/lib64/libsqlite3.so.0
+libsoftokn3.so /usr/lib64/libsoftokn3.so
+libsmime3.so /usr/lib64/libsmime3.so
+libsepol.so.1 /lib64/libsepol.so.1
+libsemanage.so.1 /lib64/libsemanage.so.1
+libselinux.so.1 /lib64/libselinux.so.1
+libsasl2.so.2 /usr/lib64/libsasl2.so.2
+librt.so.1 /lib64/librt.so.1
+librpmio.so.1 /usr/lib64/librpmio.so.1
+librpmbuild.so.1 /usr/lib64/librpmbuild.so.1
+librpm.so.1 /usr/lib64/librpm.so.1
+libresolv.so.2 /lib64/libresolv.so.2
+libreadline.so.6 /lib64/libreadline.so.6
+libp11-kit.so.0 /usr/lib64/libp11-kit.so.0
+libpython2.6.so.1.0 /usr/lib64/libpython2.6.so.1.0
+libpthread.so.0 /lib64/libpthread.so.0
+libpth.so.20 /usr/lib64/libpth.so.20
+libproc-3.2.8.so /lib64/libproc-3.2.8.so
+libpopt.so.0 /lib64/libpopt.so.0
+libply.so.2 /lib64/libply.so.2
+libply-splash-core.so.2 /lib64/libply-splash-core.so.2
+libply-boot-client.so.2 /usr/lib64/libply-boot-client.so.2
+libplds4.so /lib64/libplds4.so
+libplc4.so /lib64/libplc4.so
+libpcreposix.so.0 /usr/lib64/libpcreposix.so.0
+libpcrecpp.so.0 /usr/lib64/libpcrecpp.so.0
+libpcre.so.0 /lib64/libpcre.so.0
+libpcprofile.so /usr/lib64/libpcprofile.so
+libpanelw.so.5 /usr/lib64/libpanelw.so.5
+libpanel.so.5 /usr/lib64/libpanel.so.5
+libpamc.so.0 /lib64/libpamc.so.0
+libpam_misc.so.0 /lib64/libpam_misc.so.0
+libpam.so.0 /lib64/libpam.so.0
+libopcodes-2.20.51.0.2-5.48.el6.so /usr/lib64/libopcodes-2.20.51.0.2-5.48.el6.so
+libnss3.so /usr/lib64/libnss3.so
+libnssutil3.so /usr/lib64/libnssutil3.so
+libnsssysinit.so /usr/lib64/libnsssysinit.so
+libnsspem.so /usr/lib64/libnsspem.so
+libnssdbm3.so /usr/lib64/libnssdbm3.so
+libnssckbi.so /usr/lib64/libnssckbi.so
+libnss_nisplus.so.2 /lib64/libnss_nisplus.so.2
+libnss_nis.so.2 /lib64/libnss_nis.so.2
+libnss_hesiod.so.2 /lib64/libnss_hesiod.so.2
+libnss_files.so.2 /lib64/libnss_files.so.2
+libnss_dns.so.2 /lib64/libnss_dns.so.2
+libnss_compat.so.2 /lib64/libnss_compat.so.2
+libnspr4.so /lib64/libnspr4.so
+libnsl.so.1 /lib64/libnsl.so.1
+libnih.so.1 /lib64/libnih.so.1
+libnih-dbus.so.1 /lib64/libnih-dbus.so.1
+libncursesw.so.5 /lib64/libncursesw.so.5
+libncurses.so.5 /lib64/libncurses.so.5
+libmp.so.3 /usr/lib64/libmp.so.3
+libmenuw.so.5 /usr/lib64/libmenuw.so.5
+libmenu.so.5 /usr/lib64/libmenu.so.5
+libmemusage.so /usr/lib64/libmemusage.so
+libmagic.so.1 /usr/lib64/libmagic.so.1
+libm.so.6 /lib64/libm.so.6
+liblzma.so.0 /usr/lib64/liblzma.so.0
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+ld-linux-x86-64.so.2 /lib64/ld-linux-x86-64.so.2

aya/tests/fixtures/s390x.strings

@@ -0,0 +1,188 @@
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+libz.so.1 /lib/s390x-linux-gnu/libz.so.1
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