misc/getusershell.s

   1         .text
   2         .section        .rodata.str1.1,"aMS",@progbits,1
   3 .LC0:
   4         .string "rce"
   5 .LC1:
   6         .string "/etc/shells"
   7 .LC2:
   8         .string "/bin/sh"
   9 .LC3:
  10         .string "/bin/csh"
  11         .text
  12         .p2align 4,,15
  13         .type   initshells, @function
  14 initshells:
  15         pushq   %r13
  16         pushq   %r12
  17         pushq   %rbp
  18         pushq   %rbx
  19         subq    $152, %rsp
  20         movq    shells(%rip), %rdi
  21         call    free@PLT
  22         movq    strings(%rip), %rdi
  23         movq    $0, shells(%rip)
  24         call    free@PLT
  25         leaq    .LC0(%rip), %rsi
  26         leaq    .LC1(%rip), %rdi
  27         movq    $0, strings(%rip)
  28         call    _IO_new_fopen@PLT
  29         testq   %rax, %rax
  30         je      .L2
  31         movq    %rax, %rdi
  32         movq    %rax, %rbp
  33         call    fileno
  34         movq    %rsp, %rsi
  35         movl    %eax, %edi
  36         call    __fstat64
  37         cmpl    $-1, %eax
  38         je      .L4
  39         movq    48(%rsp), %r13
  40         movabsq $6917529027641081853, %rax
  41         cmpq    %rax, %r13
  42         jbe     .L55
  43 .L4:
  44         movq    %rbp, %rdi
  45         call    _IO_new_fclose@PLT
  46 .L2:
  47         leaq    .LC2(%rip), %rax
  48         movq    %rax, okshells(%rip)
  49         leaq    .LC3(%rip), %rax
  50         movq    %rax, 8+okshells(%rip)
  51         leaq    okshells(%rip), %rax
  52 .L1:
  53         addq    $152, %rsp
  54         popq    %rbx
  55         popq    %rbp
  56         popq    %r12
  57         popq    %r13
  58         ret
  59         .p2align 4,,10
  60         .p2align 3
  61 .L55:
  62         leaq    3(%r13), %r12
  63         movq    %r12, %rdi
  64         call    malloc@PLT
  65         testq   %rax, %rax
  66         movq    %rax, %rbx
  67         movq    %rax, strings(%rip)
  68         je      .L4
  69         movq    %r13, %rax
  70         movabsq $6148914691236517206, %rdx
  71         sarq    $63, %r13
  72         imulq   %rdx
  73         subq    %r13, %rdx
  74         leaq    0(,%rdx,8), %rdi
  75         call    malloc@PLT
  76         testq   %rax, %rax
  77         movq    %rax, %r13
  78         movq    %rax, shells(%rip)
  79         je      .L7
  80         movq    %rbx, %rax
  81         .p2align 4,,10
  82         .p2align 3
  83 .L8:
  84         movq    %rbx, %rcx
  85         movl    %r12d, %esi
  86         movq    %rbp, %rdx
  87         subq    %rax, %rcx
  88         movq    %rbx, %rdi
  89         subl    %ecx, %esi
  90         call    fgets_unlocked
  91         testq   %rax, %rax
  92         je      .L14
  93         movzbl  (%rbx), %eax
  94         cmpb    $35, %al
  95         jne     .L53
  96         jmp     .L9
  97         .p2align 4,,10
  98         .p2align 3
  99 .L10:
 100         addq    $1, %rbx
 101         movzbl  (%rbx), %eax
 102         cmpb    $35, %al
 103         je      .L9
 104 .L53:
 105         cmpb    $47, %al
 106         je      .L9
 107         testb   %al, %al
 108         jne     .L10
 109 .L11:
 110         movq    strings(%rip), %rax
 111         jmp     .L8
 112         .p2align 4,,10
 113         .p2align 3
 114 .L9:
 115         cmpb    $35, %al
 116         je      .L11
 117         testb   %al, %al
 118         je      .L11
 119         movzbl  1(%rbx), %eax
 120         testb   %al, %al
 121         je      .L11
 122         movq    __libc_tsd_CTYPE_B@gottpoff(%rip), %rdx
 123         movsbq  (%rbx), %rdi
 124         leaq    8(%r13), %rsi
 125         movq    %rbx, 0(%r13)
 126         movq    %fs:(%rdx), %rcx
 127         movq    %rdi, %rdx
 128         testb   $32, 1(%rcx,%rdi,2)
 129         jne     .L12
 130         testb   %dil, %dil
 131         setne   %dil
 132         cmpb    $35, %dl
 133         setne   %dl
 134         testb   %dl, %dil
 135         jne     .L13
 136         jmp     .L12
 137         .p2align 4,,10
 138         .p2align 3
 139 .L56:
 140         cmpb    $35, %al
 141         setne   %dl
 142         testb   %al, %al
 143         setne   %al
 144         testb   %al, %dl
 145         je      .L12
 146         movzbl  1(%rbx), %eax
 147 .L13:
 148         movsbq  %al, %rdx
 149         addq    $1, %rbx
 150         testb   $32, 1(%rcx,%rdx,2)
 151         je      .L56
 152 .L12:
 153         movb    $0, (%rbx)
 154         movq    %rsi, %r13
 155         addq    $1, %rbx
 156         movq    strings(%rip), %rax
 157         jmp     .L8
 158         .p2align 4,,10
 159         .p2align 3
 160 .L14:
 161         movq    $0, 0(%r13)
 162         movq    %rbp, %rdi
 163         call    _IO_new_fclose@PLT
 164         movq    shells(%rip), %rax
 165         jmp     .L1
 166 .L7:
 167         movq    %rbx, %rdi
 168         call    free@PLT
 169         movq    $0, strings(%rip)
 170         jmp     .L4
 171         .size   initshells, .-initshells
 172         .p2align 4,,15
 173         .globl  getusershell
 174         .type   getusershell, @function
 175 getusershell:
 176         movq    curshell(%rip), %rdx
 177         testq   %rdx, %rdx
 178         je      .L69
 179         movq    (%rdx), %rax
 180         testq   %rax, %rax
 181         je      .L66
 182         addq    $8, %rdx
 183         movq    %rdx, curshell(%rip)
 184         ret
 185         .p2align 4,,10
 186         .p2align 3
 187 .L66:
 188         rep ret
 189         .p2align 4,,10
 190         .p2align 3
 191 .L69:
 192         subq    $8, %rsp
 193         call    initshells
 194         movq    %rax, %rdx
 195         movq    %rax, curshell(%rip)
 196         movq    (%rax), %rax
 197         testq   %rax, %rax
 198         je      .L57
 199         addq    $8, %rdx
 200         movq    %rdx, curshell(%rip)
 201 .L57:
 202         addq    $8, %rsp
 203         ret
 204         .size   getusershell, .-getusershell
 205         .p2align 4,,15
 206         .globl  endusershell
 207         .type   endusershell, @function
 208 endusershell:
 209         subq    $8, %rsp
 210         movq    shells(%rip), %rdi
 211         call    free@PLT
 212         movq    strings(%rip), %rdi
 213         movq    $0, shells(%rip)
 214         call    free@PLT
 215         movq    $0, strings(%rip)
 216         movq    $0, curshell(%rip)
 217         addq    $8, %rsp
 218         ret
 219         .size   endusershell, .-endusershell
 220         .p2align 4,,15
 221         .globl  setusershell
 222         .type   setusershell, @function
 223 setusershell:
 224         subq    $8, %rsp
 225         call    initshells
 226         movq    %rax, curshell(%rip)
 227         addq    $8, %rsp
 228         ret
 229         .size   setusershell, .-setusershell
 230         .local  strings
 231         .comm   strings,8,8
 232         .local  shells
 233         .comm   shells,8,8
 234         .local  curshell
 235         .comm   curshell,8,8
 236         .local  okshells
 237         .comm   okshells,24,16
 238         .hidden fgets_unlocked
 239         .hidden __fstat64
 240         .hidden fileno