Delete ASAN

It hasn't been helpful enough to be justify the maintenance burden. What
actually does help is mprotect(), kprintf(), --ftrace and --strace which
can always be counted upon to work correctly. We aren't losing much with
this change. Support for ASAN on AARCH64 was never implemented. Applying
ASAN to the core libc runtimes was disabled many months ago. If there is
some way to have an ASAN runtime for user programs that is less invasive
we can potentially consider reintroducing support. But now is premature.

libc/proc/BUILD.mk

@@ -50,7 +50,6 @@ $(LIBC_PROC_A).pkg:					\
 
 $(LIBC_PROC_A_OBJS): private				\
 		COPTS +=				\
-			-fno-sanitize=address		\
 			-Wframe-larger-than=4096	\
 			-Walloca-larger-than=4096
 

libc/proc/execve.c

@@ -22,7 +22,6 @@
 #include "libc/calls/syscall-nt.internal.h"
 #include "libc/calls/syscall-sysv.internal.h"
 #include "libc/dce.h"
-#include "libc/intrin/asan.internal.h"
 #include "libc/intrin/describeflags.internal.h"
 #include "libc/intrin/likely.h"
 #include "libc/intrin/promises.internal.h"
@@ -63,10 +62,7 @@
 int execve(const char *prog, char *const argv[], char *const envp[]) {
   int rc;
   struct ZiposUri uri;
-  if (!prog || !argv || !envp ||
-      (IsAsan() && (!__asan_is_valid_str(prog) ||      //
-                    !__asan_is_valid_strlist(argv) ||  //
-                    !__asan_is_valid_strlist(envp)))) {
+  if (!prog || !argv || !envp) {
     rc = efault();
   } else {
     STRACE("execve(%#s, %s, %s)", prog, DescribeStringList(argv),

libc/proc/execvpe.c

@@ -18,7 +18,6 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
 #include "libc/dce.h"
-#include "libc/intrin/asan.internal.h"
 #include "libc/limits.h"
 #include "libc/mem/alloca.h"
 #include "libc/mem/mem.h"
@@ -46,12 +45,6 @@ int execvpe(const char *prog, char *const argv[], char *const *envp) {
   char *exe, **argv2;
   char pathbuf[PATH_MAX];
 
-  // validate memory
-  if (IsAsan() &&
-      (!__asan_is_valid_str(prog) || !__asan_is_valid_strlist(argv))) {
-    return efault();
-  }
-
   if (strchr(prog, '/')) {
     return execve(prog, argv, envp);
   }

libc/proc/fexecve.c

@@ -27,7 +27,6 @@
 #include "libc/dce.h"
 #include "libc/errno.h"
 #include "libc/fmt/itoa.h"
-#include "libc/intrin/asan.internal.h"
 #include "libc/intrin/describeflags.internal.h"
 #include "libc/intrin/kprintf.h"
 #include "libc/intrin/safemacros.internal.h"
@@ -186,9 +185,7 @@ static int fd_to_mem_fd(const int infd, char *path) {
  */
 int fexecve(int fd, char *const argv[], char *const envp[]) {
   int rc = 0;
-  if (!argv || !envp ||
-      (IsAsan() &&
-       (!__asan_is_valid_strlist(argv) || !__asan_is_valid_strlist(envp)))) {
+  if (!argv || !envp) {
     rc = efault();
   } else {
     STRACE("fexecve(%d, %s, %s) → ...", fd, DescribeStringList(argv),

libc/proc/getrusage.c

@@ -20,7 +20,6 @@
 #include "libc/calls/struct/rusage.h"
 #include "libc/calls/struct/rusage.internal.h"
 #include "libc/dce.h"
-#include "libc/intrin/asan.internal.h"
 #include "libc/intrin/strace.internal.h"
 #include "libc/sysv/errfuns.h"
 
@@ -34,8 +33,6 @@ int getrusage(int who, struct rusage *usage) {
   int rc;
   if (who == 99) {
     rc = einval();
-  } else if (IsAsan() && usage && !__asan_is_valid(usage, sizeof(*usage))) {
-    rc = efault();
   } else if (!IsWindows()) {
     rc = sys_getrusage(who, usage);
   } else {

libc/proc/posix_spawn.c

@@ -35,7 +35,6 @@
 #include "libc/errno.h"
 #include "libc/fmt/itoa.h"
 #include "libc/fmt/magnumstrs.internal.h"
-#include "libc/intrin/asan.internal.h"
 #include "libc/intrin/atomic.h"
 #include "libc/intrin/bsf.h"
 #include "libc/intrin/describeflags.internal.h"
@@ -419,10 +418,7 @@ static textwindows dontinline errno_t posix_spawn_nt(
     int *pid, const char *path, const posix_spawn_file_actions_t *file_actions,
     const posix_spawnattr_t *attrp, char *const argv[], char *const envp[]) {
   int err;
-  if (!path || !argv ||
-      (IsAsan() && (!__asan_is_valid_str(path) ||      //
-                    !__asan_is_valid_strlist(argv) ||  //
-                    (envp && !__asan_is_valid_strlist(envp))))) {
+  if (!path || !argv) {
     err = EFAULT;
   } else {
     err = posix_spawn_nt_impl(pid, path, file_actions, attrp, argv, envp);

libc/proc/wait4.c

@@ -20,7 +20,6 @@
 #include "libc/calls/cp.internal.h"
 #include "libc/calls/struct/rusage.internal.h"
 #include "libc/dce.h"
-#include "libc/intrin/asan.internal.h"
 #include "libc/intrin/strace.internal.h"
 #include "libc/proc/proc.internal.h"
 #include "libc/sysv/errfuns.h"
@@ -44,13 +43,7 @@ int wait4(int pid, int *opt_out_wstatus, int options,
   int rc, ws = 0;
   BEGIN_CANCELATION_POINT;
 
-  if (IsAsan() &&
-      ((opt_out_wstatus &&
-        !__asan_is_valid(opt_out_wstatus, sizeof(*opt_out_wstatus))) ||
-       (opt_out_rusage &&
-        !__asan_is_valid(opt_out_rusage, sizeof(*opt_out_rusage))))) {
-    rc = efault();
-  } else if (!IsWindows()) {
+  if (!IsWindows()) {
     rc = sys_wait4(pid, &ws, options, opt_out_rusage);
   } else {
     rc = sys_wait4_nt(pid, &ws, options, opt_out_rusage);