Auto merge of rust-lang#75406 - mati865:mingw-aslr, r=Mark-Simulacrum

Enable ASLR for windows-gnu Fixes rust-lang#16514 Fixes rust-lang#16593 Fixes rust-lang#17684 Passes the tests for me with x86_64 toolchain.
rust-lang-ci · Oct 13, 2020 · d65c08e · d65c08e
2 parents d772879 + 0ad3da0
commit d65c08e
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Showing 3 changed files with 12 additions and 2 deletions.
diff --git a/compiler/rustc_target/src/spec/windows_gnu_base.rs b/compiler/rustc_target/src/spec/windows_gnu_base.rs
@@ -11,6 +11,10 @@ pub fn opts() -> TargetOptions {
             "-fno-use-linker-plugin".to_string(),
             // Always enable DEP (NX bit) when it is available
             "-Wl,--nxcompat".to_string(),
+            // Enable ASLR
+            "-Wl,--dynamicbase".to_string(),
+            // ASLR will rebase it anyway so leaving that option enabled only leads to confusion
+            "-Wl,--disable-auto-image-base".to_string(),
         ],
     );
 

diff --git a/compiler/rustc_target/src/spec/x86_64_pc_windows_gnu.rs b/compiler/rustc_target/src/spec/x86_64_pc_windows_gnu.rs
@@ -3,7 +3,10 @@ use crate::spec::{LinkerFlavor, LldFlavor, Target};
 pub fn target() -> Target {
     let mut base = super::windows_gnu_base::opts();
     base.cpu = "x86-64".to_string();
-    base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m64".to_string());
+    let gcc_pre_link_args = base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap();
+    gcc_pre_link_args.push("-m64".to_string());
+    // Use high-entropy 64 bit address space for ASLR
+    gcc_pre_link_args.push("-Wl,--high-entropy-va".to_string());
     base.pre_link_args
         .insert(LinkerFlavor::Lld(LldFlavor::Ld), vec!["-m".to_string(), "i386pep".to_string()]);
     base.max_atomic_width = Some(64);

diff --git a/compiler/rustc_target/src/spec/x86_64_uwp_windows_gnu.rs b/compiler/rustc_target/src/spec/x86_64_uwp_windows_gnu.rs
@@ -3,7 +3,10 @@ use crate::spec::{LinkerFlavor, LldFlavor, Target};
 pub fn target() -> Target {
     let mut base = super::windows_uwp_gnu_base::opts();
     base.cpu = "x86-64".to_string();
-    base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m64".to_string());
+    let gcc_pre_link_args = base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap();
+    gcc_pre_link_args.push("-m64".to_string());
+    // Use high-entropy 64 bit address space for ASLR
+    gcc_pre_link_args.push("-Wl,--high-entropy-va".to_string());
     base.pre_link_args
         .insert(LinkerFlavor::Lld(LldFlavor::Ld), vec!["-m".to_string(), "i386pep".to_string()]);
     base.max_atomic_width = Some(64);