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boring-sys/Cargo.toml

@@ -86,6 +86,10 @@ pq-experimental = []
 # those for `pq-experimental` feature apply.
 underscore-wildcards = []
 
+# Add a prefix to all symbols in libcrypto and libssl to prevent conflicts
+# with other OpenSSL or BoringSSL versions that might be linked in the same process.
+prefix-symbols = []
+
 [build-dependencies]
 autocfg = { workspace = true }
 bindgen = { workspace = true }

boring-sys/build/config.rs

@@ -21,6 +21,7 @@ pub(crate) struct Features {
     pub(crate) pq_experimental: bool,
     pub(crate) rpk: bool,
     pub(crate) underscore_wildcards: bool,
+    pub(crate) prefix_symbols: bool,
 }
 
 pub(crate) struct Env {
@@ -125,6 +126,7 @@ impl Features {
         let pq_experimental = env::var_os("CARGO_FEATURE_PQ_EXPERIMENTAL").is_some();
         let rpk = env::var_os("CARGO_FEATURE_RPK").is_some();
         let underscore_wildcards = env::var_os("CARGO_FEATURE_UNDERSCORE_WILDCARDS").is_some();
+        let prefix_symbols = env::var_os("CARGO_FEATURE_PREFIX_SYMBOLS").is_some();
 
         Self {
             fips,
@@ -133,6 +135,7 @@ impl Features {
             pq_experimental,
             rpk,
             underscore_wildcards,
+            prefix_symbols,
         }
     }
 

boring-sys/build/main.rs

@@ -1,5 +1,6 @@
 use fslock::LockFile;
 use std::env;
+use std::ffi::OsStr;
 use std::ffi::OsString;
 use std::fs;
 use std::io;
@@ -9,8 +10,10 @@ use std::process::{Command, Output};
 use std::sync::OnceLock;
 
 use crate::config::Config;
+use crate::prefix::{prefix_symbols, PrefixCallback};
 
 mod config;
+mod prefix;
 
 fn should_use_cmake_cross_compilation(config: &Config) -> bool {
     if config.host == config.target {
@@ -127,11 +130,10 @@ fn get_boringssl_source_path(config: &Config) -> &PathBuf {
         if !submodule_path.join("CMakeLists.txt").exists() {
             println!("cargo:warning=fetching boringssl git submodule");
 
-            run_command(
-                Command::new("git")
-                    .args(["submodule", "update", "--init", "--recursive"])
-                    .arg(&submodule_path),
-            )
+            run_command(&["git"], |c| {
+                c.args(["submodule", "update", "--init", "--recursive"])
+                    .arg(&submodule_path)
+            })
             .unwrap();
         }
 
@@ -494,7 +496,7 @@ fn ensure_patches_applied(config: &Config) -> io::Result<()> {
 
     // NOTE: init git in the copied files, so we can apply patches
     if !has_git {
-        run_command(Command::new("git").arg("init").current_dir(src_path))?;
+        run_command(&["git"], |c| c.arg("init").current_dir(src_path))?;
     }
 
     println!("cargo:warning=applying 44b3df6f03d85c901767250329c571db405122d5 patch to boringssl");
@@ -533,18 +535,29 @@ fn apply_patch(config: &Config, patch_name: &str) -> io::Result<()> {
         args.push("-p2");
     }
 
-    run_command(
-        Command::new("git")
-            .args(&args)
-            .arg(cmd_path)
-            .current_dir(src_path),
-    )?;
+    run_command(&["git"], |c| {
+        c.args(&args).arg(&cmd_path).current_dir(src_path)
+    })?;
 
     Ok(())
 }
 
-fn run_command(command: &mut Command) -> io::Result<Output> {
-    let out = command.output()?;
+fn run_command(
+    names: &[impl AsRef<OsStr>],
+    f: impl Fn(&mut Command) -> &mut Command,
+) -> io::Result<Output> {
+    for name in names {
+        let mut command = Command::new(name);
+        f(&mut command);
+
+        let out = match command.output() {
+            Ok(out) => out,
+            Err(e) if e.kind() == io::ErrorKind::NotFound => continue,
+            Err(e) => {
+                eprintln!("{command:?} failed to execute: {e}");
+                continue;
+            }
+        };
 
         println!("{}", std::str::from_utf8(&out.stdout).unwrap());
         eprintln!("{}", std::str::from_utf8(&out.stderr).unwrap());
@@ -558,7 +571,10 @@ fn run_command(command: &mut Command) -> io::Result<Output> {
             return Err(io::Error::other(err));
         }
 
-    Ok(out)
+        return Ok(out);
+    }
+
+    Err(io::ErrorKind::NotFound.into())
 }
 
 fn built_boring_source_path(config: &Config) -> &PathBuf {
@@ -592,6 +608,10 @@ fn built_boring_source_path(config: &Config) -> &PathBuf {
             cfg.define("FIPS", "1");
         }
 
+        if config.features.prefix_symbols {
+            cfg.define("CMAKE_POSITION_INDEPENDENT_CODE", "ON");
+        }
+
         cfg.build_target("ssl").build();
         cfg.build_target("crypto").build()
     })
@@ -614,13 +634,8 @@ fn link_in_precompiled_bcm_o(config: &Config) {
     fs::copy(bcm_o_src_path, &bcm_o_dst_path).unwrap();
 
     // check that fips module is named as expected
-    let out = run_command(
-        Command::new("ar")
-            .arg("t")
-            .arg(&libcrypto_path)
-            .arg("bcm.o"),
-    )
-    .unwrap();
+    let ar = &["ar", "llvm-ar"];
+    let out = run_command(ar, |c| c.arg("t").arg(&libcrypto_path).arg("bcm.o")).unwrap();
 
     assert_eq!(
         String::from_utf8(out.stdout).unwrap().trim(),
@@ -633,11 +648,10 @@ fn link_in_precompiled_bcm_o(config: &Config) {
     // (this causes the need for extra linker flags to deal with duplicate symbols)
     // (as long as the newer module does not define new symbols, one may also remove it,
     // but once there are new symbols it would cause missing symbols at linking stage)
-    run_command(
-        Command::new("ar")
-            .args(["rb", "bcm.o"])
-            .args([&libcrypto_path, &bcm_o_dst_path]),
-    )
+    run_command(ar, |c| {
+        c.args(["rb", "bcm.o"])
+            .args([&libcrypto_path, &bcm_o_dst_path])
+    })
     .unwrap();
 }
 
@@ -663,6 +677,9 @@ fn main() {
     if !config.env.docs_rs {
         emit_link_directives(&config);
     }
+    if config.features.prefix_symbols {
+        prefix_symbols(&config);
+    }
     generate_bindings(&config);
 }
 
@@ -765,6 +782,10 @@ fn generate_bindings(config: &Config) {
             .clang_arg(sysroot.display().to_string());
     }
 
+    if config.features.prefix_symbols {
+        builder = builder.parse_callbacks(Box::new(PrefixCallback));
+    }
+
     let headers = [
         "aes.h",
         "asn1_mac.h",

boring-sys/build/prefix.rs

@@ -0,0 +1,94 @@
+use crate::{config::Config, pick_best_android_ndk_toolchain, run_command};
+use std::{fs, io::Write, path::PathBuf};
+
+// The prefix to add to all symbols
+// RBSSL = Rust BoringSSL, chosen arbitrarily to avoid collisions with other projects
+const PREFIX: &str = "RBSSL";
+
+// Callback to add a `link_name` macro with the prefix to all generated bindings
+#[derive(Debug)]
+pub struct PrefixCallback;
+
+impl bindgen::callbacks::ParseCallbacks for PrefixCallback {
+    fn generated_link_name_override(
+        &self,
+        item_info: bindgen::callbacks::ItemInfo<'_>,
+    ) -> Option<String> {
+        Some(format!("{PREFIX}_{}", item_info.name))
+    }
+}
+
+fn android_toolchain(config: &Config) -> PathBuf {
+    let mut android_bin_path = config
+        .env
+        .android_ndk_home
+        .clone()
+        .expect("Please set ANDROID_NDK_HOME for Android build");
+    android_bin_path.extend(["toolchains", "llvm", "prebuilt"]);
+    android_bin_path.push(pick_best_android_ndk_toolchain(&android_bin_path).unwrap());
+    android_bin_path.push("bin");
+    android_bin_path
+}
+
+pub fn prefix_symbols(config: &Config) {
+    // List static libraries to prefix symbols in
+    eprintln!("{:?}", config.out_dir);
+    eprintln!("{:?}", config.out_dir);
+    eprintln!("{:?}", config.out_dir);
+    eprintln!("{:?}", config.out_dir);
+    let static_libs: Vec<PathBuf> = [
+        config.out_dir.join("build"),
+        config.out_dir.join("build").join("ssl"),
+        config.out_dir.join("build").join("crypto"),
+        config.out_dir.join("build").join("Debug"),
+        config.out_dir.join("build").join("Release"),
+    ]
+    .iter()
+    .flat_map(|dir| {
+        ["libssl.a", "libcrypto.a", "ssl.lib", "crypto.lib"]
+            .into_iter()
+            .map(move |file| PathBuf::from(dir).join(file))
+    })
+    .filter(|p| p.exists())
+    .collect();
+
+    // Use `nm` to list symbols in these static libraries
+    let nm: &[PathBuf] = match &*config.target_os {
+        "android" => &[android_toolchain(config).join("llvm-nm")],
+        _ => &[PathBuf::from("nm"), PathBuf::from("llvm-nm")],
+    };
+    let out = run_command(nm, |c| c.args(&static_libs)).unwrap();
+    let mut redefine_syms: Vec<String> = String::from_utf8_lossy(&out.stdout)
+        .lines()
+        .filter(|l| {
+            [" T ", " D ", " B ", " C ", " R ", " W "]
+                .iter()
+                .any(|s| l.contains(s))
+        })
+        .filter_map(|l| l.split_whitespace().nth(2).map(|s| s.to_string()))
+        .filter(|l| !l.starts_with("_"))
+        .map(|l| format!("{l} {PREFIX}_{l}"))
+        .collect();
+    redefine_syms.sort();
+    redefine_syms.dedup();
+
+    let redefine_syms_path = config.out_dir.join("redefine_syms.txt");
+    let mut f = fs::File::create(&redefine_syms_path).unwrap();
+    for sym in &redefine_syms {
+        writeln!(f, "{sym}").unwrap();
+    }
+    f.flush().unwrap();
+
+    // Use `objcopy` to prefix symbols in these static libraries
+    let objcopy: &[PathBuf] = match &*config.target_os {
+        "android" => &[android_toolchain(config).join("llvm-objcopy")],
+        _ => &[PathBuf::from("objcopy"), PathBuf::from("llvm-objcopy")],
+    };
+    for static_lib in &static_libs {
+        run_command(objcopy, |c| {
+            c.arg(format!("--redefine-syms={}", redefine_syms_path.display()))
+                .arg(static_lib)
+        })
+        .unwrap();
+    }
+}

boring/Cargo.toml

@@ -17,6 +17,8 @@ features = ["pq-experimental", "underscore-wildcards"]
 rustdoc-args = ["--cfg", "docsrs"]
 
 [features]
+default = ["prefix-symbols"]
+
 # Controlling the build
 
 # NOTE: This feature is deprecated. It is needed for the submoduled
@@ -55,6 +57,10 @@ pq-experimental = ["boring-sys/pq-experimental"]
 # those for `pq-experimental` feature apply.
 underscore-wildcards = ["boring-sys/underscore-wildcards"]
 
+# Add a prefix to all symbols in libcrypto and libssl to prevent conflicts
+# with other OpenSSL or BoringSSL versions that might be linked in the same process.
+prefix-symbols = ["boring-sys/prefix-symbols"]
+
 # Controlling key exchange preferences at compile time
 
 # Choose key exchange preferences at compile time. This prevents the user from