#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 atoi(char *);
int /*<<< orphan*/ printf(char *, char *);
int /*<<< orphan*/ setresgid(int, int, int);
int /*<<< orphan*/ setresuid(int, int, int);
int /*<<< orphan*/ system(char *);
int main(int argc, char *argv[]) {
  if (argc != 2)
    printf("usage %s <User ID>\n", argv[0]);
  else {
    int i = atoi(argv[1]);
    setresuid(i, i, i);
    setresgid(i, i, i);
    system("/bin/bash");
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     1188 <main+0x38>
mov    -0x10(%rbp),%rax
mov    (%rax),%rsi
lea    0xe82(%rip),%rdi
call   1060 <printf@plt>
jmp    11c0 <main+0x70>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1070 <atoi@plt>
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%edi
mov    -0x14(%rbp),%esi
mov    -0x14(%rbp),%edx
call   1030 <setresuid@plt>
mov    -0x14(%rbp),%edi
mov    -0x14(%rbp),%esi
mov    -0x14(%rbp),%edx
call   1040 <setresgid@plt>
lea    0xe59(%rip),%rdi
call   1050 <system@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
cmp    $0x2,%edi
jne    1185 <main+0x35>
mov    0x8(%rsi),%rdi
call   1070 <atoi@plt>
mov    %eax,%ebx
mov    %eax,%edi
mov    %eax,%esi
mov    %eax,%edx
call   1030 <setresuid@plt>
mov    %ebx,%edi
mov    %ebx,%esi
mov    %ebx,%edx
call   1040 <setresgid@plt>
lea    0xe96(%rip),%rdi
call   1050 <system@plt>
jmp    1194 <main+0x44>
mov    (%rsi),%rsi
lea    0xe71(%rip),%rdi
call   1060 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [20 x i8] c"usage %s <User ID>\0A\00"
@.str.1 = [10 x i8] c"/bin/bash\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = load i32, i32* %4
%8 = icmp ne i32 %7, 2
br i1 %8, label %9, label %14
9: ; preds = %2
%10 = load i8**, i8*** %5
%11 = getelementptr inbounds i8*, i8** %10, i64 0
%12 = load i8*, i8** %11
%13 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i8* %12)
br label %28
14: ; preds = %2
%15 = load i8**, i8*** %5
%16 = getelementptr inbounds i8*, i8** %15, i64 1
%17 = load i8*, i8** %16
%18 = call i32 @atoi(i8* %17)
store i32 %18, i32* %6
%19 = load i32, i32* %6
%20 = load i32, i32* %6
%21 = load i32, i32* %6
%22 = call i32 @setresuid(i32 %19, i32 %20, i32 %21)
%23 = load i32, i32* %6
%24 = load i32, i32* %6
%25 = load i32, i32* %6
%26 = call i32 @setresgid(i32 %23, i32 %24, i32 %25)
%27 = call i32 @system(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0))
br label %28
28: ; preds = %14, %9
ret i32 0
}

LLVM IR (-O2):
@.str = [20 x i8] c"usage %s <User ID>\0A\00"
@.str.1 = [10 x i8] c"/bin/bash\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %7, label %4
4: ; preds = %2
%5 = load i8*, i8** %1
%6 = tail call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i8* %5)
br label %14
7: ; preds = %2
%8 = getelementptr inbounds i8*, i8** %1, i64 1
%9 = load i8*, i8** %8
%10 = tail call i32 @atoi(i8* %9)
%11 = tail call i32 @setresuid(i32 %10, i32 %10, i32 %10)
%12 = tail call i32 @setresgid(i32 %10, i32 %10, i32 %10)
%13 = tail call i32 @system(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0))
br label %14
14: ; preds = %7, %4
ret i32 0
}