rustc: disable jemalloc's time-delayed purging to remove ASLR-like effects.

eddyb · eddyb · commit a10f0d2c5d02 · 2022-06-13T07:59:50.000Z
diff --git a/compiler/rustc/src/main.rs b/compiler/rustc/src/main.rs
@@ -56,6 +56,12 @@ fn main() {
             #[used]
             static _F7: unsafe extern "C" fn() = _rjem_je_zone_register;
         }
+
+        // HACK(eddyb) disable time-delayed purging to remove the main (only?)
+        // source of non-determinism in `jemalloc`.
+        #[used]
+        #[export_name = "malloc_conf"]
+        static MALLOC_CONF: &'static [u8; 34] = b"dirty_decay_ms:0,muzzy_decay_ms:0\0";
     }
 
     rustc_driver::set_sigpipe_handler();

Original file line number	Diff line number	Diff line change
`@@ -56,6 +56,12 @@ fn main() {`
`56`	`56`	`#[used]`
`57`	`57`	`static _F7: unsafe extern "C" fn() = _rjem_je_zone_register;`
`58`	`58`	`}`
	`59`	`+`
	`60`	`+ // HACK(eddyb) disable time-delayed purging to remove the main (only?)`
	`61`	+ // source of non-determinism in `jemalloc`.
	`62`	`+ #[used]`
	`63`	`+ #[export_name = "malloc_conf"]`
	`64`	`+ static MALLOC_CONF: &'static [u8; 34] = b"dirty_decay_ms:0,muzzy_decay_ms:0\0";`
`59`	`65`	`}`
`60`	`66`
`61`	`67`	`rustc_driver::set_sigpipe_handler();`