#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int execvp(char *, char **);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ setgid(int /*<<< orphan*/);
int /*<<< orphan*/ setuid(int /*<<< orphan*/);
int /*<<< orphan*/ stderr;
int main(int argc, char **argv) {
  if (argc < 2) {
    fprintf(stderr, "Syntax: %s <program> [arguments]\n", argv[0]);
    return 1;
  }
  setuid(0);
  setgid(0);
  if (execvp(argv[1], argv + 1) == -1) {
    perror("root_exec: execvp failed");
    return 1;
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
jge    1198 <main+0x48>
mov    0x2e69(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe79(%rip),%rsi
call   1030 <fprintf@plt>
movl   $0x1,-0x4(%rbp)
jmp    11d7 <main+0x87>
xor    %edi,%edi
call   1070 <setuid@plt>
xor    %edi,%edi
call   1040 <setgid@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
mov    -0x10(%rbp),%rsi
add    $0x8,%rsi
call   1060 <execvp@plt>
cmp    $0xffffffff,%eax
jne    11d7 <main+0x87>
lea    0xe57(%rip),%rdi
call   1050 <perror@plt>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
mov    %rsi,%rbx
cmp    $0x1,%edi
jg     117a <main+0x2a>
mov    0x2e7e(%rip),%rax
mov    (%rax),%edi
mov    (%rbx),%rdx
lea    0xe92(%rip),%rsi
call   1030 <fprintf@plt>
mov    $0x1,%ebp
jmp    119f <main+0x4f>
xor    %ebp,%ebp
xor    %edi,%edi
call   1070 <setuid@plt>
xor    %edi,%edi
call   1040 <setgid@plt>
mov    0x8(%rbx),%rdi
add    $0x8,%rbx
mov    %rbx,%rsi
call   1060 <execvp@plt>
cmp    $0xffffffff,%eax
je     11a8 <main+0x58>
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret
lea    0xe73(%rip),%rdi
call   1050 <perror@plt>
jmp    1173 <main+0x23>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [34 x i8] c"Syntax: %s <program> [arguments]\0A\00"
@.str.1 = [25 x i8] c"root_exec: execvp failed\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = load i32, i32* %4
%7 = icmp slt i32 %6, 2
br i1 %7, label %8, label %14
8: ; preds = %2
%9 = load i32, i32* @stderr
%10 = load i8**, i8*** %5
%11 = getelementptr inbounds i8*, i8** %10, i64 0
%12 = load i8*, i8** %11
%13 = call i32 @fprintf(i32 %9, i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str, i64 0, i64 0), i8* %12)
store i32 1, i32* %3
br label %26
14: ; preds = %2
%15 = call i32 @setuid(i32 0)
%16 = call i32 @setgid(i32 0)
%17 = load i8**, i8*** %5
%18 = getelementptr inbounds i8*, i8** %17, i64 1
%19 = load i8*, i8** %18
%20 = load i8**, i8*** %5
%21 = getelementptr inbounds i8*, i8** %20, i64 1
%22 = call i32 @execvp(i8* %19, i8** %21)
%23 = icmp eq i32 %22, -1
br i1 %23, label %24, label %26
24: ; preds = %14
%25 = call i32 @perror(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.1, i64 0, i64 0))
store i32 1, i32* %3
br label %26
26: ; preds = %8, %24, %14
%27 = load i32, i32* %3
ret i32 %27
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [34 x i8] c"Syntax: %s <program> [arguments]\0A\00"
@.str.1 = [25 x i8] c"root_exec: execvp failed\00"
define i32 @main(i32 %0, i8** %1) {
%3 = icmp slt i32 %0, 2
br i1 %3, label %4, label %8
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str, i64 0, i64 0), i8* %6)
br label %17
8: ; preds = %2
%9 = tail call i32 @setuid(i32 0)
%10 = tail call i32 @setgid(i32 0)
%11 = getelementptr inbounds i8*, i8** %1, i64 1
%12 = load i8*, i8** %11
%13 = tail call i32 @execvp(i8* %12, i8** %11)
%14 = icmp eq i32 %13, -1
br i1 %14, label %15, label %17
15: ; preds = %8
%16 = tail call i32 @perror(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.1, i64 0, i64 0))
br label %17
17: ; preds = %4, %15, %8
%18 = phi i32 [ 1, %4 ], [ 1, %15 ], [ 0, %8 ]
ret i32 %18
}