Move to nostd printf and musl crates (#3188)

* Adopt nostd-printf

* Adopt nostd-musl

Author: WorksButNotTested

libafl_qemu/librasan/Justfile

@@ -82,11 +82,11 @@ build_everything_dev: \
   build_ppc_dev \
 
 build_everything_release: \
-  build_arm_dev \
-  build_aarch64_dev \
-  build_x86_64_dev \
-  build_i386_dev \
-  build_ppc_dev \
+  build_arm_release \
+  build_aarch64_release \
+  build_x86_64_release \
+  build_i386_release \
+  build_ppc_release \
 
 build_everything: build_everything_dev build_everything_release
 

libafl_qemu/librasan/asan/Cargo.toml

@@ -59,6 +59,11 @@ log = { version = "0.4.22", default-features = false, features = [
   "release_max_level_info",
 ] }
 libc = { version = "0.2.169", default-features = false, optional = true }
+nostd-musl = { version = "0.1.5", default-features = false, features = [
+  "optimized-assembly",
+] }
+nostd-printf = { version = "0.1.4", default-features = false }
+
 readonly = { version = "0.2.12", default-features = false }
 rustix = { version = "1.0.0", default-features = false, features = [
   "fs",

libafl_qemu/librasan/asan/build.rs

@@ -1,17 +1,17 @@
 fn main() {
     println!("cargo:rerun-if-changed=cc/include/hooks.h");
     println!("cargo:rerun-if-changed=cc/include/trace.h");
-    println!("cargo:rerun-if-changed=cc/include/printf.h");
     println!("cargo:rerun-if-changed=cc/src/asprintf.c");
     println!("cargo:rerun-if-changed=cc/src/log.c");
-    println!("cargo:rerun-if-changed=cc/src/printf.c");
     println!("cargo:rerun-if-changed=cc/src/vasprintf.c");
 
     cc::Build::new()
         .define("_GNU_SOURCE", None)
         .opt_level(3)
         .flag("-Werror")
         .flag("-fno-stack-protector")
+        .flag("-U_FORTIFY_SOURCE")
+        .flag("-D_FORTIFY_SOURCE=0")
         .flag("-ffunction-sections")
         .include("cc/include/")
         .file("cc/src/asprintf.c")
@@ -22,6 +22,8 @@ fn main() {
         .opt_level(3)
         .flag("-Werror")
         .flag("-fno-stack-protector")
+        .flag("-U_FORTIFY_SOURCE")
+        .flag("-D_FORTIFY_SOURCE=0")
         .flag("-ffunction-sections")
         .include("cc/include/")
         .file("cc/src/log.c")
@@ -32,16 +34,8 @@ fn main() {
         .opt_level(3)
         .flag("-Werror")
         .flag("-fno-stack-protector")
-        .flag("-ffunction-sections")
-        .include("cc/include/")
-        .file("cc/src/printf.c")
-        .compile("printf");
-
-    cc::Build::new()
-        .define("_GNU_SOURCE", None)
-        .opt_level(3)
-        .flag("-Werror")
-        .flag("-fno-stack-protector")
+        .flag("-U_FORTIFY_SOURCE")
+        .flag("-D_FORTIFY_SOURCE=0")
         .flag("-ffunction-sections")
         .include("cc/include/")
         .file("cc/src/vasprintf.c")

libafl_qemu/librasan/asan/cc/include/printf.h

@@ -1,8 +1,8 @@
 #include <limits.h>
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdio.h>
 #include "hooks.h"
-#include "printf.h"
 #include "trace.h"
 
 int asprintf(char **restrict strp, const char *restrict fmt, ...) {
@@ -13,7 +13,7 @@ int asprintf(char **restrict strp, const char *restrict fmt, ...) {
 
   va_list va;
   va_start(va, fmt);
-  int len = vsnprintf_(NULL, 0, fmt, va);
+  int len = vsnprintf(NULL, 0, fmt, va);
   va_end(va);
 
   if (len < 0) { return -1; }
@@ -22,5 +22,5 @@ int asprintf(char **restrict strp, const char *restrict fmt, ...) {
   if (buffer == NULL) { return -1; }
 
   *strp = buffer;
-  return vsnprintf_(buffer, len, fmt, va);
+  return vsnprintf(buffer, len, fmt, va);
 }

libafl_qemu/librasan/asan/cc/src/asprintf.c

@@ -1,6 +1,6 @@
 #include <limits.h>
 #include <stdarg.h>
-#include "printf.h"
+#include <stdio.h>
 
 static char log_buffer[PATH_MAX] = {0};
 
@@ -9,13 +9,7 @@ extern void log_trace(char *msg);
 void trace(const char *fmt, ...) {
   va_list va;
   va_start(va, fmt);
-  int len = vsnprintf_(log_buffer, sizeof(log_buffer), fmt, va);
+  int len = vsnprintf(log_buffer, sizeof(log_buffer), fmt, va);
   if (len > 0) { log_trace(log_buffer); }
   va_end(va);
 }
-
-#ifdef __powerpc__
-void _putchar(char c) {
-  (void)c;
-}
-#endif