Merge tag 'nolibc.2023.04.04a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull nolibc updates from Paul McKenney:

- Add support for loongarch

- Fix stack-protector issues

- Support additional integral types and signal-related macros

- Add support for stdin, stdout, and stderr

- Add getuid() and geteuid()

- Allow S_I* macros to be overridden by program

- Defer to linux/fcntl.h and linux/stat.h to avoid duplicate
definitions

- Many improvements to the selftests

* tag 'nolibc.2023.04.04a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (22 commits)
tools/nolibc: x86_64: add stackprotector support
tools/nolibc: i386: add stackprotector support
tools/nolibc: tests: add test for -fstack-protector
tools/nolibc: tests: fold in no-stack-protector cflags
tools/nolibc: add support for stack protector
tools/nolibc: tests: constify test_names
tools/nolibc: add helpers for wait() signal exits
tools/nolibc: add definitions for standard fds
selftests/nolibc: Adjust indentation for Makefile
selftests/nolibc: Add support for LoongArch
tools/nolibc: Add support for LoongArch
tools/nolibc: Add statx() and make stat() rely on statx() if necessary
tools/nolibc: Include linux/fcntl.h and remove duplicate code
tools/nolibc: check for S_I* macros before defining them
selftests/nolibc: skip the chroot_root and link_dir tests when not privileged
tools/nolibc: add getuid() and geteuid()
tools/nolibc: add tests for the integer limits in stdint.h
tools/nolibc: enlarge column width of tests
tools/nolibc: add integer types and integer limit macros
tools/nolibc: add stdint.h
...

tools/include/nolibc/.gitignore

···
+sysroot

tools/include/nolibc/Makefile

···
 
 nolibc_arch := $(patsubst arm64,aarch64,$(ARCH))
 arch_file := arch-$(nolibc_arch).h
-all_files := ctype.h errno.h nolibc.h signal.h std.h stdio.h stdlib.h string.h \
-             sys.h time.h types.h unistd.h
+all_files := ctype.h errno.h nolibc.h signal.h stackprotector.h std.h stdint.h \
+             stdio.h stdlib.h string.h sys.h time.h types.h unistd.h
 
 # install all headers needed to support a bare-metal compiler
 all: headers

tools/include/nolibc/arch-i386.h

···
 char **environ __attribute__((weak));
 const unsigned long *_auxv __attribute__((weak));
 
+#define __ARCH_SUPPORTS_STACK_PROTECTOR
+
 /* startup code */
 /*
  * i386 System V ABI mandates:
···
  * 2) The deepest stack frame should be set to zero
  *
  */
-void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
+void __attribute__((weak,noreturn,optimize("omit-frame-pointer"),no_stack_protector)) _start(void)
 {
 	__asm__ volatile (
+#ifdef NOLIBC_STACKPROTECTOR
+		"call __stack_chk_init\n"   // initialize stack protector
+#endif
 		"pop %eax\n"                // argc   (first arg, %eax)
 		"mov %esp, %ebx\n"          // argv[] (second arg, %ebx)
 		"lea 4(%ebx,%eax,4),%ecx\n" // then a NULL then envp (third arg, %ecx)

tools/include/nolibc/arch-loongarch.h

···
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * LoongArch specific definitions for NOLIBC
+ * Copyright (C) 2023 Loongson Technology Corporation Limited
+ */
+
+#ifndef _NOLIBC_ARCH_LOONGARCH_H
+#define _NOLIBC_ARCH_LOONGARCH_H
+
+/* Syscalls for LoongArch :
+ *   - stack is 16-byte aligned
+ *   - syscall number is passed in a7
+ *   - arguments are in a0, a1, a2, a3, a4, a5
+ *   - the system call is performed by calling "syscall 0"
+ *   - syscall return comes in a0
+ *   - the arguments are cast to long and assigned into the target
+ *     registers which are then simply passed as registers to the asm code,
+ *     so that we don't have to experience issues with register constraints.
+ *
+ * On LoongArch, select() is not implemented so we have to use pselect6().
+ */
+#define __ARCH_WANT_SYS_PSELECT6
+
+#define my_syscall0(num)                                                      \
+({                                                                            \
+	register long _num  __asm__ ("a7") = (num);                           \
+	register long _arg1 __asm__ ("a0");                                   \
+									      \
+	__asm__  volatile (                                                   \
+		"syscall 0\n"                                                 \
+		: "=r"(_arg1)                                                 \
+		: "r"(_num)                                                   \
+		: "memory", "$t0", "$t1", "$t2", "$t3",                       \
+		  "$t4", "$t5", "$t6", "$t7", "$t8"                           \
+	);                                                                    \
+	_arg1;                                                                \
+})
+
+#define my_syscall1(num, arg1)                                                \
+({                                                                            \
+	register long _num  __asm__ ("a7") = (num);                           \
+	register long _arg1 __asm__ ("a0") = (long)(arg1);		      \
+									      \
+	__asm__  volatile (                                                   \
+		"syscall 0\n"                                                 \
+		: "+r"(_arg1)                                                 \
+		: "r"(_num)                                                   \
+		: "memory", "$t0", "$t1", "$t2", "$t3",                       \
+		  "$t4", "$t5", "$t6", "$t7", "$t8"                           \
+	);                                                                    \
+	_arg1;                                                                \
+})
+
+#define my_syscall2(num, arg1, arg2)                                          \
+({                                                                            \
+	register long _num  __asm__ ("a7") = (num);                           \
+	register long _arg1 __asm__ ("a0") = (long)(arg1);                    \
+	register long _arg2 __asm__ ("a1") = (long)(arg2);                    \
+									      \
+	__asm__  volatile (                                                   \
+		"syscall 0\n"                                                 \
+		: "+r"(_arg1)                                                 \
+		: "r"(_arg2),                                                 \
+		  "r"(_num)                                                   \
+		: "memory", "$t0", "$t1", "$t2", "$t3",                       \
+		  "$t4", "$t5", "$t6", "$t7", "$t8"                           \
+	);                                                                    \
+	_arg1;                                                                \
+})
+
+#define my_syscall3(num, arg1, arg2, arg3)                                    \
+({                                                                            \
+	register long _num  __asm__ ("a7") = (num);                           \
+	register long _arg1 __asm__ ("a0") = (long)(arg1);                    \
+	register long _arg2 __asm__ ("a1") = (long)(arg2);                    \
+	register long _arg3 __asm__ ("a2") = (long)(arg3);                    \
+									      \
+	__asm__  volatile (                                                   \
+		"syscall 0\n"                                                 \
+		: "+r"(_arg1)                                                 \
+		: "r"(_arg2), "r"(_arg3),                                     \
+		  "r"(_num)                                                   \
+		: "memory", "$t0", "$t1", "$t2", "$t3",                       \
+		  "$t4", "$t5", "$t6", "$t7", "$t8"                           \
+	);                                                                    \
+	_arg1;                                                                \
+})
+
+#define my_syscall4(num, arg1, arg2, arg3, arg4)                              \
+({                                                                            \
+	register long _num  __asm__ ("a7") = (num);                           \
+	register long _arg1 __asm__ ("a0") = (long)(arg1);                    \
+	register long _arg2 __asm__ ("a1") = (long)(arg2);                    \
+	register long _arg3 __asm__ ("a2") = (long)(arg3);                    \
+	register long _arg4 __asm__ ("a3") = (long)(arg4);                    \
+									      \
+	__asm__  volatile (                                                   \
+		"syscall 0\n"                                                 \
+		: "+r"(_arg1)                                                 \
+		: "r"(_arg2), "r"(_arg3), "r"(_arg4),                         \
+		  "r"(_num)                                                   \
+		: "memory", "$t0", "$t1", "$t2", "$t3",                       \
+		  "$t4", "$t5", "$t6", "$t7", "$t8"                           \
+	);                                                                    \
+	_arg1;                                                                \
+})
+
+#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5)                        \
+({                                                                            \
+	register long _num  __asm__ ("a7") = (num);                           \
+	register long _arg1 __asm__ ("a0") = (long)(arg1);                    \
+	register long _arg2 __asm__ ("a1") = (long)(arg2);                    \
+	register long _arg3 __asm__ ("a2") = (long)(arg3);                    \
+	register long _arg4 __asm__ ("a3") = (long)(arg4);                    \
+	register long _arg5 __asm__ ("a4") = (long)(arg5);                    \
+									      \
+	__asm__  volatile (                                                   \
+		"syscall 0\n"                                                 \
+		: "+r"(_arg1)                                                 \
+		: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5),             \
+		  "r"(_num)                                                   \
+		: "memory", "$t0", "$t1", "$t2", "$t3",                       \
+		  "$t4", "$t5", "$t6", "$t7", "$t8"                           \
+	);                                                                    \
+	_arg1;                                                                \
+})
+
+#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6)                  \
+({                                                                            \
+	register long _num  __asm__ ("a7") = (num);                           \
+	register long _arg1 __asm__ ("a0") = (long)(arg1);                    \
+	register long _arg2 __asm__ ("a1") = (long)(arg2);                    \
+	register long _arg3 __asm__ ("a2") = (long)(arg3);                    \
+	register long _arg4 __asm__ ("a3") = (long)(arg4);                    \
+	register long _arg5 __asm__ ("a4") = (long)(arg5);                    \
+	register long _arg6 __asm__ ("a5") = (long)(arg6);                    \
+									      \
+	__asm__  volatile (                                                   \
+		"syscall 0\n"                                                 \
+		: "+r"(_arg1)                                                 \
+		: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_arg6), \
+		  "r"(_num)                                                   \
+		: "memory", "$t0", "$t1", "$t2", "$t3",                       \
+		  "$t4", "$t5", "$t6", "$t7", "$t8"                           \
+	);                                                                    \
+	_arg1;                                                                \
+})
+
+char **environ __attribute__((weak));
+const unsigned long *_auxv __attribute__((weak));
+
+#if __loongarch_grlen == 32
+#define LONGLOG      "2"
+#define SZREG        "4"
+#define REG_L        "ld.w"
+#define LONG_S       "st.w"
+#define LONG_ADD     "add.w"
+#define LONG_ADDI    "addi.w"
+#define LONG_SLL     "slli.w"
+#define LONG_BSTRINS "bstrins.w"
+#else // __loongarch_grlen == 64
+#define LONGLOG      "3"
+#define SZREG        "8"
+#define REG_L        "ld.d"
+#define LONG_S       "st.d"
+#define LONG_ADD     "add.d"
+#define LONG_ADDI    "addi.d"
+#define LONG_SLL     "slli.d"
+#define LONG_BSTRINS "bstrins.d"
+#endif
+
+/* startup code */
+void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
+{
+	__asm__ volatile (
+		REG_L        " $a0, $sp, 0\n"         // argc (a0) was in the stack
+		LONG_ADDI    " $a1, $sp, "SZREG"\n"   // argv (a1) = sp + SZREG
+		LONG_SLL     " $a2, $a0, "LONGLOG"\n" // envp (a2) = SZREG*argc ...
+		LONG_ADDI    " $a2, $a2, "SZREG"\n"   //             + SZREG (skip null)
+		LONG_ADD     " $a2, $a2, $a1\n"       //             + argv
+
+		"move          $a3, $a2\n"            // iterate a3 over envp to find auxv (after NULL)
+		"0:\n"                                // do {
+		REG_L        " $a4, $a3, 0\n"         //   a4 = *a3;
+		LONG_ADDI    " $a3, $a3, "SZREG"\n"   //   a3 += sizeof(void*);
+		"bne           $a4, $zero, 0b\n"      // } while (a4);
+		"la.pcrel      $a4, _auxv\n"          // a4 = &_auxv
+		LONG_S       " $a3, $a4, 0\n"         // store a3 into _auxv
+
+		"la.pcrel      $a3, environ\n"        // a3 = &environ
+		LONG_S       " $a2, $a3, 0\n"         // store envp(a2) into environ
+		LONG_BSTRINS " $sp, $zero, 3, 0\n"    // sp must be 16-byte aligned
+		"bl            main\n"                // main() returns the status code, we'll exit with it.
+		"li.w          $a7, 93\n"             // NR_exit == 93
+		"syscall       0\n"
+	);
+	__builtin_unreachable();
+}
+
+#endif // _NOLIBC_ARCH_LOONGARCH_H

tools/include/nolibc/arch-x86_64.h

···
 char **environ __attribute__((weak));
 const unsigned long *_auxv __attribute__((weak));
 
+#define __ARCH_SUPPORTS_STACK_PROTECTOR
+
 /* startup code */
 /*
  * x86-64 System V ABI mandates:
···
 void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)
 {
 	__asm__ volatile (
+#ifdef NOLIBC_STACKPROTECTOR
+		"call __stack_chk_init\n"   // initialize stack protector
+#endif
 		"pop %rdi\n"                // argc   (first arg, %rdi)
 		"mov %rsp, %rsi\n"          // argv[] (second arg, %rsi)
 		"lea 8(%rsi,%rdi,8),%rdx\n" // then a NULL then envp (third arg, %rdx)

tools/include/nolibc/arch.h

···
 #include "arch-riscv.h"
 #elif defined(__s390x__)
 #include "arch-s390.h"
+#elif defined(__loongarch__)
+#include "arch-loongarch.h"
 #endif
 
 #endif /* _NOLIBC_ARCH_H */

tools/include/nolibc/nolibc.h

···
 #include "string.h"
 #include "time.h"
 #include "unistd.h"
+#include "stackprotector.h"
 
 /* Used by programs to avoid std includes */
 #define NOLIBC

tools/include/nolibc/stackprotector.h

···
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * Stack protector support for NOLIBC
+ * Copyright (C) 2023 Thomas Weißschuh <[e-mail]>
+ */
+
+#ifndef _NOLIBC_STACKPROTECTOR_H
+#define _NOLIBC_STACKPROTECTOR_H
+
+#include "arch.h"
+
+#if defined(NOLIBC_STACKPROTECTOR)
+
+#if !defined(__ARCH_SUPPORTS_STACK_PROTECTOR)
+#error "nolibc does not support stack protectors on this arch"
+#endif
+
+#include "sys.h"
+#include "stdlib.h"
+
+/* The functions in this header are using raw syscall macros to avoid
+ * triggering stack protector errors themselves
+ */
+
+__attribute__((weak,noreturn,section(".text.nolibc_stack_chk")))
+void __stack_chk_fail(void)
+{
+	pid_t pid;
+	my_syscall3(__NR_write, STDERR_FILENO, "!!Stack smashing detected!!\n", 28);
+	pid = my_syscall0(__NR_getpid);
+	my_syscall2(__NR_kill, pid, SIGABRT);
+	for (;;);
+}
+
+__attribute__((weak,noreturn,section(".text.nolibc_stack_chk")))
+void __stack_chk_fail_local(void)
+{
+	__stack_chk_fail();
+}
+
+__attribute__((weak,section(".data.nolibc_stack_chk")))
+uintptr_t __stack_chk_guard;
+
+__attribute__((weak,no_stack_protector,section(".text.nolibc_stack_chk")))
+void __stack_chk_init(void)
+{
+	my_syscall3(__NR_getrandom, &__stack_chk_guard, sizeof(__stack_chk_guard), 0);
+	/* a bit more randomness in case getrandom() fails */
+	__stack_chk_guard ^= (uintptr_t) &__stack_chk_guard;
+}
+#endif // defined(NOLIBC_STACKPROTECTOR)
+
+#endif // _NOLIBC_STACKPROTECTOR_H

tools/include/nolibc/std.h

···
 #define NULL ((void *)0)
 #endif
 
-/* stdint types */
-typedef unsigned char       uint8_t;
-typedef   signed char        int8_t;
-typedef unsigned short     uint16_t;
-typedef   signed short      int16_t;
-typedef unsigned int       uint32_t;
-typedef   signed int        int32_t;
-typedef unsigned long long uint64_t;
-typedef   signed long long  int64_t;
-typedef unsigned long        size_t;
-typedef   signed long       ssize_t;
-typedef unsigned long     uintptr_t;
-typedef   signed long      intptr_t;
-typedef   signed long     ptrdiff_t;
+#include "stdint.h"
 
 /* those are commonly provided by sys/types.h */
 typedef unsigned int          dev_t;

tools/include/nolibc/stdint.h

···
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * Standard definitions and types for NOLIBC
+ * Copyright (C) 2023 Vincent Dagonneau <[e-mail]>
+ */
+
+#ifndef _NOLIBC_STDINT_H
+#define _NOLIBC_STDINT_H
+
+typedef unsigned char       uint8_t;
+typedef   signed char        int8_t;
+typedef unsigned short     uint16_t;
+typedef   signed short      int16_t;
+typedef unsigned int       uint32_t;
+typedef   signed int        int32_t;
+typedef unsigned long long uint64_t;
+typedef   signed long long  int64_t;
+typedef unsigned long        size_t;
+typedef   signed long       ssize_t;
+typedef unsigned long     uintptr_t;
+typedef   signed long      intptr_t;
+typedef   signed long     ptrdiff_t;
+
+typedef   int8_t       int_least8_t;
+typedef  uint8_t      uint_least8_t;
+typedef  int16_t      int_least16_t;
+typedef uint16_t     uint_least16_t;
+typedef  int32_t      int_least32_t;
+typedef uint32_t     uint_least32_t;
+typedef  int64_t      int_least64_t;
+typedef uint64_t     uint_least64_t;
+
+typedef   int8_t        int_fast8_t;
+typedef  uint8_t       uint_fast8_t;
+typedef  ssize_t       int_fast16_t;
+typedef   size_t      uint_fast16_t;
+typedef  ssize_t       int_fast32_t;
+typedef   size_t      uint_fast32_t;
+typedef  ssize_t       int_fast64_t;
+typedef   size_t      uint_fast64_t;
+
+typedef  int64_t           intmax_t;
+typedef uint64_t          uintmax_t;
+
+/* limits of integral types */
+
+#define        INT8_MIN  (-128)
+#define       INT16_MIN  (-32767-1)
+#define       INT32_MIN  (-2147483647-1)
+#define       INT64_MIN  (-9223372036854775807LL-1)
+
+#define        INT8_MAX  (127)
+#define       INT16_MAX  (32767)
+#define       INT32_MAX  (2147483647)
+#define       INT64_MAX  (9223372036854775807LL)
+
+#define       UINT8_MAX  (255)
+#define      UINT16_MAX  (65535)
+#define      UINT32_MAX  (4294967295U)
+#define      UINT64_MAX  (18446744073709551615ULL)
+
+#define  INT_LEAST8_MIN  INT8_MIN
+#define INT_LEAST16_MIN  INT16_MIN
+#define INT_LEAST32_MIN  INT32_MIN
+#define INT_LEAST64_MIN  INT64_MIN
+
+#define  INT_LEAST8_MAX  INT8_MAX
+#define INT_LEAST16_MAX  INT16_MAX
+#define INT_LEAST32_MAX  INT32_MAX
+#define INT_LEAST64_MAX  INT64_MAX
+
+#define  UINT_LEAST8_MAX UINT8_MAX
+#define UINT_LEAST16_MAX UINT16_MAX
+#define UINT_LEAST32_MAX UINT32_MAX
+#define UINT_LEAST64_MAX UINT64_MAX
+
+#define SIZE_MAX         ((size_t)(__LONG_MAX__) * 2 + 1)
+#define INTPTR_MIN       (-__LONG_MAX__ - 1)
+#define INTPTR_MAX       __LONG_MAX__
+#define PTRDIFF_MIN      INTPTR_MIN
+#define PTRDIFF_MAX      INTPTR_MAX
+#define UINTPTR_MAX      SIZE_MAX
+
+#define  INT_FAST8_MIN   INT8_MIN
+#define INT_FAST16_MIN   INTPTR_MIN
+#define INT_FAST32_MIN   INTPTR_MIN
+#define INT_FAST64_MIN   INTPTR_MIN
+
+#define  INT_FAST8_MAX   INT8_MAX
+#define INT_FAST16_MAX   INTPTR_MAX
+#define INT_FAST32_MAX   INTPTR_MAX
+#define INT_FAST64_MAX   INTPTR_MAX
+
+#define  UINT_FAST8_MAX  UINT8_MAX
+#define UINT_FAST16_MAX  SIZE_MAX
+#define UINT_FAST32_MAX  SIZE_MAX
+#define UINT_FAST64_MAX  SIZE_MAX
+
+#endif /* _NOLIBC_STDINT_H */

tools/include/nolibc/sys.h

···
 #include "std.h"
 
 /* system includes */
-#include <asm/fcntl.h>   // for O_*
 #include <asm/unistd.h>
 #include <asm/signal.h>  // for SIGCHLD
 #include <asm/ioctls.h>
···
 #include <linux/loop.h>
 #include <linux/time.h>
 #include <linux/auxvec.h>
+#include <linux/fcntl.h> // for O_* and AT_*
+#include <linux/stat.h>  // for statx()
 
 #include "arch.h"
 #include "errno.h"
···
 
 
 /*
+ * uid_t geteuid(void);
+ */
+
+static __attribute__((unused))
+uid_t sys_geteuid(void)
+{
+#ifdef __NR_geteuid32
+	return my_syscall0(__NR_geteuid32);
+#else
+	return my_syscall0(__NR_geteuid);
+#endif
+}
+
+static __attribute__((unused))
+uid_t geteuid(void)
+{
+	return sys_geteuid();
+}
+
+
+/*
  * pid_t getpgid(pid_t pid);
  */
 
···
 		ret = -1;
 	}
 	return ret;
+}
+
+
+/*
+ * uid_t getuid(void);
+ */
+
+static __attribute__((unused))
+uid_t sys_getuid(void)
+{
+#ifdef __NR_getuid32
+	return my_syscall0(__NR_getuid32);
+#else
+	return my_syscall0(__NR_getuid);
+#endif
+}
+
+static __attribute__((unused))
+uid_t getuid(void)
+{
+	return sys_getuid();
 }
 
 
···
 	return ret;
 }
 
+#if defined(__NR_statx)
+/*
+ * int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf);
+ */
+
+static __attribute__((unused))
+int sys_statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf)
+{
+	return my_syscall5(__NR_statx, fd, path, flags, mask, buf);
+}
+
+static __attribute__((unused))
+int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf)
+{
+	int ret = sys_statx(fd, path, flags, mask, buf);
+
+	if (ret < 0) {
+		SET_ERRNO(-ret);
+		ret = -1;
+	}
+	return ret;
+}
+#endif
 
 /*
  * int stat(const char *path, struct stat *buf);
  * Warning: the struct stat's layout is arch-dependent.
  */
 
+#if defined(__NR_statx) && !defined(__NR_newfstatat) && !defined(__NR_stat)
+/*
+ * Maybe we can just use statx() when available for all architectures?
+ */
+static __attribute__((unused))
+int sys_stat(const char *path, struct stat *buf)
+{
+	struct statx statx;
+	long ret;
+
+	ret = sys_statx(AT_FDCWD, path, AT_NO_AUTOMOUNT, STATX_BASIC_STATS, &statx);
+	buf->st_dev     = ((statx.stx_dev_minor & 0xff)
+			  | (statx.stx_dev_major << 8)
+			  | ((statx.stx_dev_minor & ~0xff) << 12));
+	buf->st_ino     = statx.stx_ino;
+	buf->st_mode    = statx.stx_mode;
+	buf->st_nlink   = statx.stx_nlink;
+	buf->st_uid     = statx.stx_uid;
+	buf->st_gid     = statx.stx_gid;
+	buf->st_rdev    = ((statx.stx_rdev_minor & 0xff)
+			  | (statx.stx_rdev_major << 8)
+			  | ((statx.stx_rdev_minor & ~0xff) << 12));
+	buf->st_size    = statx.stx_size;
+	buf->st_blksize = statx.stx_blksize;
+	buf->st_blocks  = statx.stx_blocks;
+	buf->st_atime   = statx.stx_atime.tv_sec;
+	buf->st_mtime   = statx.stx_mtime.tv_sec;
+	buf->st_ctime   = statx.stx_ctime.tv_sec;
+	return ret;
+}
+#else
 static __attribute__((unused))
 int sys_stat(const char *path, struct stat *buf)
 {
···
 	buf->st_ctime   = stat.st_ctime;
 	return ret;
 }
+#endif
 
 static __attribute__((unused))
 int stat(const char *path, struct stat *buf)

tools/include/nolibc/types.h

···
 
 #include "std.h"
 #include <linux/time.h>
+#include <linux/stat.h>
 
 
 /* Only the generic macros and types may be defined here. The arch-specific
···
  * the layout of sys_stat_struct must not be defined here.
  */
 
-/* stat flags (WARNING, octal here) */
+/* stat flags (WARNING, octal here). We need to check for an existing
+ * definition because linux/stat.h may omit to define those if it finds
+ * that any glibc header was already included.
+ */
+#if !defined(S_IFMT)
 #define S_IFDIR        0040000
 #define S_IFCHR        0020000
 #define S_IFBLK        0060000
···
 #define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
 #define S_ISLNK(mode)  (((mode) & S_IFMT) == S_IFLNK)
 #define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
+
+#define S_IRWXU 00700
+#define S_IRUSR 00400
+#define S_IWUSR 00200
+#define S_IXUSR 00100
+
+#define S_IRWXG 00070
+#define S_IRGRP 00040
+#define S_IWGRP 00020
+#define S_IXGRP 00010
+
+#define S_IRWXO 00007
+#define S_IROTH 00004
+#define S_IWOTH 00002
+#define S_IXOTH 00001
+#endif
 
 /* dirent types */
 #define DT_UNKNOWN     0x0
···
 #define MAXPATHLEN     (PATH_MAX)
 #endif
 
-/* Special FD used by all the *at functions */
-#ifndef AT_FDCWD
-#define AT_FDCWD       (-100)
-#endif
-
 /* whence values for lseek() */
 #define SEEK_SET       0
 #define SEEK_CUR       1
···
 /* Macros used on waitpid()'s return status */
 #define WEXITSTATUS(status) (((status) & 0xff00) >> 8)
 #define WIFEXITED(status)   (((status) & 0x7f) == 0)
+#define WTERMSIG(status)    ((status) & 0x7f)
+#define WIFSIGNALED(status) ((status) - 1 < 0xff)
 
 /* waitpid() flags */
 #define WNOHANG      1

tools/include/nolibc/unistd.h

···
 #include "sys.h"
 
 
+#define STDIN_FILENO  0
+#define STDOUT_FILENO 1
+#define STDERR_FILENO 2
+
+
 static __attribute__((unused))
 int msleep(unsigned int msecs)
 {

tools/testing/selftests/nolibc/Makefile

···
 # SPDX-License-Identifier: GPL-2.0
 # Makefile for nolibc tests
 include ../../../scripts/Makefile.include
+# We need this for the "cc-option" macro.
+include ../../../build/Build.include
 
 # we're in ".../tools/testing/selftests/nolibc"
 ifeq ($(srctree),)
···
 endif
 
 # kernel image names by architecture
-IMAGE_i386    = arch/x86/boot/bzImage
-IMAGE_x86_64  = arch/x86/boot/bzImage
-IMAGE_x86     = arch/x86/boot/bzImage
-IMAGE_arm64   = arch/arm64/boot/Image
-IMAGE_arm     = arch/arm/boot/zImage
-IMAGE_mips    = vmlinuz
-IMAGE_riscv   = arch/riscv/boot/Image
-IMAGE_s390    = arch/s390/boot/bzImage
-IMAGE         = $(IMAGE_$(ARCH))
-IMAGE_NAME    = $(notdir $(IMAGE))
+IMAGE_i386       = arch/x86/boot/bzImage
+IMAGE_x86_64     = arch/x86/boot/bzImage
+IMAGE_x86        = arch/x86/boot/bzImage
+IMAGE_arm64      = arch/arm64/boot/Image
+IMAGE_arm        = arch/arm/boot/zImage
+IMAGE_mips       = vmlinuz
+IMAGE_riscv      = arch/riscv/boot/Image
+IMAGE_s390       = arch/s390/boot/bzImage
+IMAGE_loongarch  = arch/loongarch/boot/vmlinuz.efi
+IMAGE            = $(IMAGE_$(ARCH))
+IMAGE_NAME       = $(notdir $(IMAGE))
 
 # default kernel configurations that appear to be usable
-DEFCONFIG_i386    = defconfig
-DEFCONFIG_x86_64  = defconfig
-DEFCONFIG_x86     = defconfig
-DEFCONFIG_arm64   = defconfig
-DEFCONFIG_arm     = multi_v7_defconfig
-DEFCONFIG_mips    = malta_defconfig
-DEFCONFIG_riscv   = defconfig
-DEFCONFIG_s390    = defconfig
-DEFCONFIG         = $(DEFCONFIG_$(ARCH))
+DEFCONFIG_i386       = defconfig
+DEFCONFIG_x86_64     = defconfig
+DEFCONFIG_x86        = defconfig
+DEFCONFIG_arm64      = defconfig
+DEFCONFIG_arm        = multi_v7_defconfig
+DEFCONFIG_mips       = malta_defconfig
+DEFCONFIG_riscv      = defconfig
+DEFCONFIG_s390       = defconfig
+DEFCONFIG_loongarch  = defconfig
+DEFCONFIG            = $(DEFCONFIG_$(ARCH))
 
 # optional tests to run (default = all)
 TEST =
 
 # QEMU_ARCH: arch names used by qemu
-QEMU_ARCH_i386    = i386
-QEMU_ARCH_x86_64  = x86_64
-QEMU_ARCH_x86     = x86_64
-QEMU_ARCH_arm64   = aarch64
-QEMU_ARCH_arm     = arm
-QEMU_ARCH_mips    = mipsel  # works with malta_defconfig
-QEMU_ARCH_riscv   = riscv64
-QEMU_ARCH_s390    = s390x
-QEMU_ARCH         = $(QEMU_ARCH_$(ARCH))
+QEMU_ARCH_i386       = i386
+QEMU_ARCH_x86_64     = x86_64
+QEMU_ARCH_x86        = x86_64
+QEMU_ARCH_arm64      = aarch64
+QEMU_ARCH_arm        = arm
+QEMU_ARCH_mips       = mipsel  # works with malta_defconfig
+QEMU_ARCH_riscv      = riscv64
+QEMU_ARCH_s390       = s390x
+QEMU_ARCH_loongarch  = loongarch64
+QEMU_ARCH            = $(QEMU_ARCH_$(ARCH))
 
 # QEMU_ARGS : some arch-specific args to pass to qemu
-QEMU_ARGS_i386    = -M pc -append "console=ttyS0,9600 i8042.noaux panic=-1 $(TEST:%=NOLIBC_TEST=%)"
-QEMU_ARGS_x86_64  = -M pc -append "console=ttyS0,9600 i8042.noaux panic=-1 $(TEST:%=NOLIBC_TEST=%)"
-QEMU_ARGS_x86     = -M pc -append "console=ttyS0,9600 i8042.noaux panic=-1 $(TEST:%=NOLIBC_TEST=%)"
-QEMU_ARGS_arm64   = -M virt -cpu cortex-a53 -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
-QEMU_ARGS_arm     = -M virt -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
-QEMU_ARGS_mips    = -M malta -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
-QEMU_ARGS_riscv   = -M virt -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
-QEMU_ARGS_s390    = -M s390-ccw-virtio -m 1G -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
-QEMU_ARGS         = $(QEMU_ARGS_$(ARCH))
+QEMU_ARGS_i386       = -M pc -append "console=ttyS0,9600 i8042.noaux panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_x86_64     = -M pc -append "console=ttyS0,9600 i8042.noaux panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_x86        = -M pc -append "console=ttyS0,9600 i8042.noaux panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_arm64      = -M virt -cpu cortex-a53 -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_arm        = -M virt -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_mips       = -M malta -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_riscv      = -M virt -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_s390       = -M s390-ccw-virtio -m 1G -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_loongarch  = -M virt -append "console=ttyS0,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS            = $(QEMU_ARGS_$(ARCH))
 
 # OUTPUT is only set when run from the main makefile, otherwise
 # it defaults to this nolibc directory.
···
 Q=@
 endif
 
+CFLAGS_STACKPROTECTOR = -DNOLIBC_STACKPROTECTOR \
+			$(call cc-option,-mstack-protector-guard=global) \
+			$(call cc-option,-fstack-protector-all)
+CFLAGS_STKP_i386 = $(CFLAGS_STACKPROTECTOR)
+CFLAGS_STKP_x86_64 = $(CFLAGS_STACKPROTECTOR)
+CFLAGS_STKP_x86 = $(CFLAGS_STACKPROTECTOR)
 CFLAGS_s390 = -m64
-CFLAGS  ?= -Os -fno-ident -fno-asynchronous-unwind-tables $(CFLAGS_$(ARCH))
+CFLAGS  ?= -Os -fno-ident -fno-asynchronous-unwind-tables \
+		$(call cc-option,-fno-stack-protector) \
+		$(CFLAGS_STKP_$(ARCH)) $(CFLAGS_$(ARCH))
 LDFLAGS := -s
 
 help:

tools/testing/selftests/nolibc/nolibc-test.c

···
  */
 
 #define EXPECT_ZR(cond, expr)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_zr(expr, llen); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_zr(expr, llen); } while (0)
 
 static int expect_zr(int expr, int llen)
 {
 	int ret = !(expr == 0);
 
 	llen += printf(" = %d ", expr);
-	pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
+	pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 	return ret;
 }
 
 
 #define EXPECT_NZ(cond, expr, val)			\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_nz(expr, llen; } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_nz(expr, llen; } while (0)
 
 static int expect_nz(int expr, int llen)
 {
 	int ret = !(expr != 0);
 
 	llen += printf(" = %d ", expr);
-	pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
+	pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 	return ret;
 }
 
 
 #define EXPECT_EQ(cond, expr, val)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_eq(expr, llen, val); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_eq(expr, llen, val); } while (0)
 
-static int expect_eq(int expr, int llen, int val)
+static int expect_eq(uint64_t expr, int llen, uint64_t val)
 {
 	int ret = !(expr == val);
 
-	llen += printf(" = %d ", expr);
-	pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
+	llen += printf(" = %lld ", expr);
+	pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 	return ret;
 }
 
 
 #define EXPECT_NE(cond, expr, val)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_ne(expr, llen, val); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_ne(expr, llen, val); } while (0)
 
 static int expect_ne(int expr, int llen, int val)
 {
 	int ret = !(expr != val);
 
 	llen += printf(" = %d ", expr);
-	pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
+	pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 	return ret;
 }
 
 
 #define EXPECT_GE(cond, expr, val)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_ge(expr, llen, val); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_ge(expr, llen, val); } while (0)
 
 static int expect_ge(int expr, int llen, int val)
 {
 	int ret = !(expr >= val);
 
 	llen += printf(" = %d ", expr);
-	pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
+	pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 	return ret;
 }
 
 
 #define EXPECT_GT(cond, expr, val)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_gt(expr, llen, val); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_gt(expr, llen, val); } while (0)
 
 static int expect_gt(int expr, int llen, int val)
 {
 	int ret = !(expr > val);
 
 	llen += printf(" = %d ", expr);
-	pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
+	pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 	return ret;
 }
 
 
 #define EXPECT_LE(cond, expr, val)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_le(expr, llen, val); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_le(expr, llen, val); } while (0)
 
 static int expect_le(int expr, int llen, int val)
 {
 	int ret = !(expr <= val);
 
 	llen += printf(" = %d ", expr);
-	pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
+	pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 	return ret;
 }
 
 
 #define EXPECT_LT(cond, expr, val)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_lt(expr, llen, val); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_lt(expr, llen, val); } while (0)
 
 static int expect_lt(int expr, int llen, int val)
 {
 	int ret = !(expr < val);
 
 	llen += printf(" = %d ", expr);
-	pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
+	pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 	return ret;
 }
 
 
 #define EXPECT_SYSZR(cond, expr)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_syszr(expr, llen); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_syszr(expr, llen); } while (0)
 
 static int expect_syszr(int expr, int llen)
 {
···
 	if (expr) {
 		ret = 1;
 		llen += printf(" = %d %s ", expr, errorname(errno));
-		llen += pad_spc(llen, 40, "[FAIL]\n");
+		llen += pad_spc(llen, 64, "[FAIL]\n");
 	} else {
 		llen += printf(" = %d ", expr);
-		llen += pad_spc(llen, 40, " [OK]\n");
+		llen += pad_spc(llen, 64, " [OK]\n");
 	}
 	return ret;
 }
 
 
 #define EXPECT_SYSEQ(cond, expr, val)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_syseq(expr, llen, val); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_syseq(expr, llen, val); } while (0)
 
 static int expect_syseq(int expr, int llen, int val)
 {
···
 	if (expr != val) {
 		ret = 1;
 		llen += printf(" = %d %s ", expr, errorname(errno));
-		llen += pad_spc(llen, 40, "[FAIL]\n");
+		llen += pad_spc(llen, 64, "[FAIL]\n");
 	} else {
 		llen += printf(" = %d ", expr);
-		llen += pad_spc(llen, 40, " [OK]\n");
+		llen += pad_spc(llen, 64, " [OK]\n");
 	}
 	return ret;
 }
 
 
 #define EXPECT_SYSNE(cond, expr, val)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_sysne(expr, llen, val); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_sysne(expr, llen, val); } while (0)
 
 static int expect_sysne(int expr, int llen, int val)
 {
···
 	if (expr == val) {
 		ret = 1;
 		llen += printf(" = %d %s ", expr, errorname(errno));
-		llen += pad_spc(llen, 40, "[FAIL]\n");
+		llen += pad_spc(llen, 64, "[FAIL]\n");
 	} else {
 		llen += printf(" = %d ", expr);
-		llen += pad_spc(llen, 40, " [OK]\n");
+		llen += pad_spc(llen, 64, " [OK]\n");
 	}
 	return ret;
 }
 
 
 #define EXPECT_SYSER(cond, expr, expret, experr)			\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_syserr(expr, expret, experr, llen); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_syserr(expr, expret, experr, llen); } while (0)
 
 static int expect_syserr(int expr, int expret, int experr, int llen)
 {
···
 	if (expr != expret || _errno != experr) {
 		ret = 1;
 		llen += printf(" != (%d %s) ", expret, errorname(experr));
-		llen += pad_spc(llen, 40, "[FAIL]\n");
+		llen += pad_spc(llen, 64, "[FAIL]\n");
 	} else {
-		llen += pad_spc(llen, 40, " [OK]\n");
+		llen += pad_spc(llen, 64, " [OK]\n");
 	}
 	return ret;
 }
 
 
 #define EXPECT_PTRZR(cond, expr)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_ptrzr(expr, llen); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_ptrzr(expr, llen); } while (0)
 
 static int expect_ptrzr(const void *expr, int llen)
 {
···
 	llen += printf(" = <%p> ", expr);
 	if (expr) {
 		ret = 1;
-		llen += pad_spc(llen, 40, "[FAIL]\n");
+		llen += pad_spc(llen, 64, "[FAIL]\n");
 	} else {
-		llen += pad_spc(llen, 40, " [OK]\n");
+		llen += pad_spc(llen, 64, " [OK]\n");
 	}
 	return ret;
 }
 
 
 #define EXPECT_PTRNZ(cond, expr)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_ptrnz(expr, llen); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_ptrnz(expr, llen); } while (0)
 
 static int expect_ptrnz(const void *expr, int llen)
 {
···
 	llen += printf(" = <%p> ", expr);
 	if (!expr) {
 		ret = 1;
-		llen += pad_spc(llen, 40, "[FAIL]\n");
+		llen += pad_spc(llen, 64, "[FAIL]\n");
 	} else {
-		llen += pad_spc(llen, 40, " [OK]\n");
+		llen += pad_spc(llen, 64, " [OK]\n");
 	}
 	return ret;
 }
 
 
 #define EXPECT_STRZR(cond, expr)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_strzr(expr, llen); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_strzr(expr, llen); } while (0)
 
 static int expect_strzr(const char *expr, int llen)
 {
···
 	llen += printf(" = <%s> ", expr);
 	if (expr) {
 		ret = 1;
-		llen += pad_spc(llen, 40, "[FAIL]\n");
+		llen += pad_spc(llen, 64, "[FAIL]\n");
 	} else {
-		llen += pad_spc(llen, 40, " [OK]\n");
+		llen += pad_spc(llen, 64, " [OK]\n");
 	}
 	return ret;
 }
 
 
 #define EXPECT_STRNZ(cond, expr)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_strnz(expr, llen); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_strnz(expr, llen); } while (0)
 
 static int expect_strnz(const char *expr, int llen)
 {
···
 	llen += printf(" = <%s> ", expr);
 	if (!expr) {
 		ret = 1;
-		llen += pad_spc(llen, 40, "[FAIL]\n");
+		llen += pad_spc(llen, 64, "[FAIL]\n");
 	} else {
-		llen += pad_spc(llen, 40, " [OK]\n");
+		llen += pad_spc(llen, 64, " [OK]\n");
 	}
 	return ret;
 }
 
 
 #define EXPECT_STREQ(cond, expr, cmp)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_streq(expr, llen, cmp); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_streq(expr, llen, cmp); } while (0)
 
 static int expect_streq(const char *expr, int llen, const char *cmp)
 {
···
 	llen += printf(" = <%s> ", expr);
 	if (strcmp(expr, cmp) != 0) {
 		ret = 1;
-		llen += pad_spc(llen, 40, "[FAIL]\n");
+		llen += pad_spc(llen, 64, "[FAIL]\n");
 	} else {
-		llen += pad_spc(llen, 40, " [OK]\n");
+		llen += pad_spc(llen, 64, " [OK]\n");
 	}
 	return ret;
 }
 
 
 #define EXPECT_STRNE(cond, expr, cmp)				\
-	do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_strne(expr, llen, cmp); } while (0)
+	do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_strne(expr, llen, cmp); } while (0)
 
 static int expect_strne(const char *expr, int llen, const char *cmp)
 {
···
 	llen += printf(" = <%s> ", expr);
 	if (strcmp(expr, cmp) == 0) {
 		ret = 1;
-		llen += pad_spc(llen, 40, "[FAIL]\n");
+		llen += pad_spc(llen, 64, "[FAIL]\n");
 	} else {
-		llen += pad_spc(llen, 40, " [OK]\n");
+		llen += pad_spc(llen, 64, " [OK]\n");
 	}
 	return ret;
 }
···
 int run_syscall(int min, int max)
 {
 	struct stat stat_buf;
+	int euid0;
 	int proc;
 	int test;
 	int tmp;
···
 
 	/* <proc> indicates whether or not /proc is mounted */
 	proc = stat("/proc", &stat_buf) == 0;
+
+	/* this will be used to skip certain tests that can't be run unprivileged */
+	euid0 = geteuid() == 0;
 
 	for (test = min; test >= 0 && test <= max; test++) {
 		int llen = 0; // line length
···
 		CASE_TEST(chmod_net);         EXPECT_SYSZR(proc, chmod("/proc/self/net", 0555)); break;
 		CASE_TEST(chmod_self);        EXPECT_SYSER(proc, chmod("/proc/self", 0555), -1, EPERM); break;
 		CASE_TEST(chown_self);        EXPECT_SYSER(proc, chown("/proc/self", 0, 0), -1, EPERM); break;
-		CASE_TEST(chroot_root);       EXPECT_SYSZR(1, chroot("/")); break;
+		CASE_TEST(chroot_root);       EXPECT_SYSZR(euid0, chroot("/")); break;
 		CASE_TEST(chroot_blah);       EXPECT_SYSER(1, chroot("/proc/self/blah"), -1, ENOENT); break;
 		CASE_TEST(chroot_exe);        EXPECT_SYSER(proc, chroot("/proc/self/exe"), -1, ENOTDIR); break;
 		CASE_TEST(close_m1);          EXPECT_SYSER(1, close(-1), -1, EBADF); break;
···
 		CASE_TEST(ioctl_tiocinq);     EXPECT_SYSZR(1, ioctl(0, TIOCINQ, &tmp)); break;
 		CASE_TEST(link_root1);        EXPECT_SYSER(1, link("/", "/"), -1, EEXIST); break;
 		CASE_TEST(link_blah);         EXPECT_SYSER(1, link("/proc/self/blah", "/blah"), -1, ENOENT); break;
-		CASE_TEST(link_dir);          EXPECT_SYSER(1, link("/", "/blah"), -1, EPERM); break;
+		CASE_TEST(link_dir);          EXPECT_SYSER(euid0, link("/", "/blah"), -1, EPERM); break;
 		CASE_TEST(link_cross);        EXPECT_SYSER(proc, link("/proc/self/net", "/blah"), -1, EXDEV); break;
 		CASE_TEST(lseek_m1);          EXPECT_SYSER(1, lseek(-1, 0, SEEK_SET), -1, EBADF); break;
 		CASE_TEST(lseek_0);           EXPECT_SYSER(1, lseek(0, 0, SEEK_SET), -1, ESPIPE); break;
···
 		CASE_TEST(memcmp_e0_20);       EXPECT_GT(1, memcmp("aaa\xe0", "aaa\x20", 4), 0); break;
 		CASE_TEST(memcmp_80_e0);       EXPECT_LT(1, memcmp("aaa\x80", "aaa\xe0", 4), 0); break;
 		CASE_TEST(memcmp_e0_80);       EXPECT_GT(1, memcmp("aaa\xe0", "aaa\x80", 4), 0); break;
+		CASE_TEST(limit_int8_max);          EXPECT_EQ(1, INT8_MAX,         (int8_t)          0x7f); break;
+		CASE_TEST(limit_int8_min);          EXPECT_EQ(1, INT8_MIN,         (int8_t)          0x80); break;
+		CASE_TEST(limit_uint8_max);         EXPECT_EQ(1, UINT8_MAX,        (uint8_t)         0xff); break;
+		CASE_TEST(limit_int16_max);         EXPECT_EQ(1, INT16_MAX,        (int16_t)         0x7fff); break;
+		CASE_TEST(limit_int16_min);         EXPECT_EQ(1, INT16_MIN,        (int16_t)         0x8000); break;
+		CASE_TEST(limit_uint16_max);        EXPECT_EQ(1, UINT16_MAX,       (uint16_t)        0xffff); break;
+		CASE_TEST(limit_int32_max);         EXPECT_EQ(1, INT32_MAX,        (int32_t)         0x7fffffff); break;
+		CASE_TEST(limit_int32_min);         EXPECT_EQ(1, INT32_MIN,        (int32_t)         0x80000000); break;
+		CASE_TEST(limit_uint32_max);        EXPECT_EQ(1, UINT32_MAX,       (uint32_t)        0xffffffff); break;
+		CASE_TEST(limit_int64_max);         EXPECT_EQ(1, INT64_MAX,        (int64_t)         0x7fffffffffffffff); break;
+		CASE_TEST(limit_int64_min);         EXPECT_EQ(1, INT64_MIN,        (int64_t)         0x8000000000000000); break;
+		CASE_TEST(limit_uint64_max);        EXPECT_EQ(1, UINT64_MAX,       (uint64_t)        0xffffffffffffffff); break;
+		CASE_TEST(limit_int_least8_max);    EXPECT_EQ(1, INT_LEAST8_MAX,   (int_least8_t)    0x7f); break;
+		CASE_TEST(limit_int_least8_min);    EXPECT_EQ(1, INT_LEAST8_MIN,   (int_least8_t)    0x80); break;
+		CASE_TEST(limit_uint_least8_max);   EXPECT_EQ(1, UINT_LEAST8_MAX,  (uint_least8_t)   0xff); break;
+		CASE_TEST(limit_int_least16_max);   EXPECT_EQ(1, INT_LEAST16_MAX,  (int_least16_t)   0x7fff); break;
+		CASE_TEST(limit_int_least16_min);   EXPECT_EQ(1, INT_LEAST16_MIN,  (int_least16_t)   0x8000); break;
+		CASE_TEST(limit_uint_least16_max);  EXPECT_EQ(1, UINT_LEAST16_MAX, (uint_least16_t)  0xffff); break;
+		CASE_TEST(limit_int_least32_max);   EXPECT_EQ(1, INT_LEAST32_MAX,  (int_least32_t)   0x7fffffff); break;
+		CASE_TEST(limit_int_least32_min);   EXPECT_EQ(1, INT_LEAST32_MIN,  (int_least32_t)   0x80000000); break;
+		CASE_TEST(limit_uint_least32_max);  EXPECT_EQ(1, UINT_LEAST32_MAX, (uint_least32_t)  0xffffffffU); break;
+		CASE_TEST(limit_int_least64_min);   EXPECT_EQ(1, INT_LEAST64_MIN,  (int_least64_t)   0x8000000000000000LL); break;
+		CASE_TEST(limit_int_least64_max);   EXPECT_EQ(1, INT_LEAST64_MAX,  (int_least64_t)   0x7fffffffffffffffLL); break;
+		CASE_TEST(limit_uint_least64_max);  EXPECT_EQ(1, UINT_LEAST64_MAX, (uint_least64_t)  0xffffffffffffffffULL); break;
+		CASE_TEST(limit_int_fast8_max);     EXPECT_EQ(1, INT_FAST8_MAX,    (int_fast8_t)     0x7f); break;
+		CASE_TEST(limit_int_fast8_min);     EXPECT_EQ(1, INT_FAST8_MIN,    (int_fast8_t)     0x80); break;
+		CASE_TEST(limit_uint_fast8_max);    EXPECT_EQ(1, UINT_FAST8_MAX,   (uint_fast8_t)    0xff); break;
+		CASE_TEST(limit_int_fast16_min);    EXPECT_EQ(1, INT_FAST16_MIN,   (int_fast16_t)    INTPTR_MIN); break;
+		CASE_TEST(limit_int_fast16_max);    EXPECT_EQ(1, INT_FAST16_MAX,   (int_fast16_t)    INTPTR_MAX); break;
+		CASE_TEST(limit_uint_fast16_max);   EXPECT_EQ(1, UINT_FAST16_MAX,  (uint_fast16_t)   UINTPTR_MAX); break;
+		CASE_TEST(limit_int_fast32_min);    EXPECT_EQ(1, INT_FAST32_MIN,   (int_fast32_t)    INTPTR_MIN); break;
+		CASE_TEST(limit_int_fast32_max);    EXPECT_EQ(1, INT_FAST32_MAX,   (int_fast32_t)    INTPTR_MAX); break;
+		CASE_TEST(limit_uint_fast32_max);   EXPECT_EQ(1, UINT_FAST32_MAX,  (uint_fast32_t)   UINTPTR_MAX); break;
+		CASE_TEST(limit_int_fast64_min);    EXPECT_EQ(1, INT_FAST64_MIN,   (int_fast64_t)    INTPTR_MIN); break;
+		CASE_TEST(limit_int_fast64_max);    EXPECT_EQ(1, INT_FAST64_MAX,   (int_fast64_t)    INTPTR_MAX); break;
+		CASE_TEST(limit_uint_fast64_max);   EXPECT_EQ(1, UINT_FAST64_MAX,  (uint_fast64_t)   UINTPTR_MAX); break;
+#if __SIZEOF_LONG__ == 8
+		CASE_TEST(limit_intptr_min);        EXPECT_EQ(1, INTPTR_MIN,       (intptr_t)        0x8000000000000000LL); break;
+		CASE_TEST(limit_intptr_max);        EXPECT_EQ(1, INTPTR_MAX,       (intptr_t)        0x7fffffffffffffffLL); break;
+		CASE_TEST(limit_uintptr_max);       EXPECT_EQ(1, UINTPTR_MAX,      (uintptr_t)       0xffffffffffffffffULL); break;
+		CASE_TEST(limit_ptrdiff_min);       EXPECT_EQ(1, PTRDIFF_MIN,      (ptrdiff_t)       0x8000000000000000LL); break;
+		CASE_TEST(limit_ptrdiff_max);       EXPECT_EQ(1, PTRDIFF_MAX,      (ptrdiff_t)       0x7fffffffffffffffLL); break;
+		CASE_TEST(limit_size_max);          EXPECT_EQ(1, SIZE_MAX,         (size_t)          0xffffffffffffffffULL); break;
+#elif __SIZEOF_LONG__ == 4
+		CASE_TEST(limit_intptr_min);        EXPECT_EQ(1, INTPTR_MIN,       (intptr_t)        0x80000000); break;
+		CASE_TEST(limit_intptr_max);        EXPECT_EQ(1, INTPTR_MAX,       (intptr_t)        0x7fffffff); break;
+		CASE_TEST(limit_uintptr_max);       EXPECT_EQ(1, UINTPTR_MAX,      (uintptr_t)       0xffffffffU); break;
+		CASE_TEST(limit_ptrdiff_min);       EXPECT_EQ(1, PTRDIFF_MIN,      (ptrdiff_t)       0x80000000); break;
+		CASE_TEST(limit_ptrdiff_max);       EXPECT_EQ(1, PTRDIFF_MAX,      (ptrdiff_t)       0x7fffffff); break;
+		CASE_TEST(limit_size_max);          EXPECT_EQ(1, SIZE_MAX,         (size_t)          0xffffffffU); break;
+#else
+# warning "__SIZEOF_LONG__ is undefined"
+#endif /* __SIZEOF_LONG__ */
 		case __LINE__:
 			return ret; /* must be last */
 		/* note: do not set any defaults so as to permit holes above */
 		}
 	}
 	return ret;
+}
+
+#if defined(__clang__)
+__attribute__((optnone))
+#elif defined(__GNUC__)
+__attribute__((optimize("O0")))
+#endif
+static int smash_stack(void)
+{
+	char buf[100];
+
+	for (size_t i = 0; i < 200; i++)
+		buf[i] = 'P';
+
+	return 1;
+}
+
+static int run_protection(int min, int max)
+{
+	pid_t pid;
+	int llen = 0, status;
+
+	llen += printf("0 -fstackprotector ");
+
+#if !defined(NOLIBC_STACKPROTECTOR)
+	llen += printf("not supported");
+	pad_spc(llen, 64, "[SKIPPED]\n");
+	return 0;
+#endif
+
+	pid = -1;
+	pid = fork();
+
+	switch (pid) {
+	case -1:
+		llen += printf("fork()");
+		pad_spc(llen, 64, "[FAIL]\n");
+		return 1;
+
+	case 0:
+		close(STDOUT_FILENO);
+		close(STDERR_FILENO);
+
+		smash_stack();
+		return 1;
+
+	default:
+		pid = waitpid(pid, &status, 0);
+
+		if (pid == -1 || !WIFSIGNALED(status) || WTERMSIG(status) != SIGABRT) {
+			llen += printf("waitpid()");
+			pad_spc(llen, 64, "[FAIL]\n");
+			return 1;
+		}
+		pad_spc(llen, 64, " [OK]\n");
+		return 0;
+	}
 }
 
 /* prepare what needs to be prepared for pid 1 (stdio, /dev, /proc, etc) */
···
 }
 
 /* This is the definition of known test names, with their functions */
-static struct test test_names[] = {
+static const struct test test_names[] = {
 	/* add new tests here */
-	{ .name = "syscall",   .func = run_syscall  },
-	{ .name = "stdlib",    .func = run_stdlib   },
+	{ .name = "syscall",    .func = run_syscall    },
+	{ .name = "stdlib",     .func = run_stdlib     },
+	{ .name = "protection", .func = run_protection },
 	{ 0 }
 };