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<li class="navelem"><a class="el" href="dir_0df11c8132d7ff4583cd88fdf05fcdad.html">fuse-3.10.5</a></li><li class="navelem"><a class="el" href="dir_73668431f9ccc5089fb4d17dc79852c8.html">util</a></li> </ul>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> FUSE: Filesystem in Userspace</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu></span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"></span> </div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> This program can be distributed under the terms of the GNU GPLv2.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> See the file COPYING.</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  </div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "config.h"</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <string.h></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <unistd.h></span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <errno.h></span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <stdint.h></span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <fcntl.h></span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <pwd.h></span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <sys/wait.h></span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  </div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#ifdef linux</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <sys/prctl.h></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <sys/syscall.h></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <linux/capability.h></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <linux/securebits.h></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">/* for 2.6 kernels */</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#if !defined(SECBIT_KEEP_CAPS) && defined(SECURE_KEEP_CAPS)</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS))</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#if !defined(SECBIT_KEEP_CAPS_LOCKED) && defined(SECURE_KEEP_CAPS_LOCKED)</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED))</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#if !defined(SECBIT_NO_SETUID_FIXUP) && defined(SECURE_NO_SETUID_FIXUP)</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP))</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#if !defined(SECBIT_NO_SETUID_FIXUP_LOCKED) && defined(SECURE_NO_SETUID_FIXUP_LOCKED)</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#define SECBIT_NO_SETUID_FIXUP_LOCKED (issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED))</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#if !defined(SECBIT_NOROOT) && defined(SECURE_NOROOT)</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT))</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#if !defined(SECBIT_NOROOT_LOCKED) && defined(SECURE_NOROOT_LOCKED)</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED))</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor">#include "fuse.h"</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  </div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">static</span> <span class="keywordtype">char</span> *progname;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">static</span> <span class="keywordtype">char</span> *xstrdup(<span class="keyword">const</span> <span class="keywordtype">char</span> *s)</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> {</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordtype">char</span> *t = strdup(s);</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">if</span> (!t) {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  fprintf(stderr, <span class="stringliteral">"%s: failed to allocate memory\n"</span>, progname);</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  exit(1);</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  }</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">return</span> t;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> }</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  </div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="keyword">static</span> <span class="keywordtype">void</span> *xrealloc(<span class="keywordtype">void</span> *oldptr, <span class="keywordtype">size_t</span> size)</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> {</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">void</span> *ptr = realloc(oldptr, size);</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">if</span> (!ptr) {</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  fprintf(stderr, <span class="stringliteral">"%s: failed to allocate memory\n"</span>, progname);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  exit(1);</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">return</span> ptr;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> }</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  </div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="keyword">static</span> <span class="keywordtype">void</span> add_arg(<span class="keywordtype">char</span> **cmdp, <span class="keyword">const</span> <span class="keywordtype">char</span> *opt)</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> {</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordtype">size_t</span> optlen = strlen(opt);</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordtype">size_t</span> cmdlen = *cmdp ? strlen(*cmdp) : 0;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">if</span> (optlen >= (SIZE_MAX - cmdlen - 4)/4) {</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  fprintf(stderr, <span class="stringliteral">"%s: argument too long\n"</span>, progname);</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  exit(1);</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordtype">char</span> *cmd = xrealloc(*cmdp, cmdlen + optlen * 4 + 4);</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordtype">char</span> *s;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  s = cmd + cmdlen;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">if</span> (*cmdp)</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  *s++ = <span class="charliteral">' '</span>;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  *s++ = <span class="charliteral">'\''</span>;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">for</span> (; *opt; opt++) {</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">if</span> (*opt == <span class="charliteral">'\''</span>) {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  *s++ = <span class="charliteral">'\''</span>;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  *s++ = <span class="charliteral">'\\'</span>;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  *s++ = <span class="charliteral">'\''</span>;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  *s++ = <span class="charliteral">'\''</span>;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  } <span class="keywordflow">else</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  *s++ = *opt;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  }</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  *s++ = <span class="charliteral">'\''</span>;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  *s = <span class="charliteral">'\0'</span>;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  *cmdp = cmd;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> }</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  </div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="keyword">static</span> <span class="keywordtype">char</span> *add_option(<span class="keyword">const</span> <span class="keywordtype">char</span> *opt, <span class="keywordtype">char</span> *options)</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordtype">int</span> oldlen = options ? strlen(options) : 0;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  </div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  options = xrealloc(options, oldlen + 1 + strlen(opt) + 1);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">if</span> (!oldlen)</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  strcpy(options, opt);</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  strcat(options, <span class="stringliteral">","</span>);</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  strcat(options, opt);</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  }</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">return</span> options;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> }</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="keyword">static</span> <span class="keywordtype">int</span> prepare_fuse_fd(<span class="keyword">const</span> <span class="keywordtype">char</span> *mountpoint, <span class="keyword">const</span> <span class="keywordtype">char</span>* subtype,</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *options)</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> {</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordtype">int</span> fuse_fd = -1;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordtype">int</span> flags = -1;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordtype">int</span> subtype_len = strlen(subtype) + 9;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordtype">char</span>* options_copy = xrealloc(NULL, subtype_len);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  </div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  snprintf(options_copy, subtype_len, <span class="stringliteral">"subtype=%s"</span>, subtype);</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  options_copy = add_option(options, options_copy);</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  fuse_fd = <a class="code" href="fuse-3_810_84_2include_2fuse_8h.html#a9e8c9af40b22631f9f2636019cd073b6">fuse_open_channel</a>(mountpoint, options_copy);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> (fuse_fd == -1) {</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  exit(1);</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  }</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  </div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  flags = fcntl(fuse_fd, F_GETFD);</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">if</span> (flags == -1 || fcntl(fuse_fd, F_SETFD, flags & ~FD_CLOEXEC) == 1) {</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  fprintf(stderr, <span class="stringliteral">"%s: Failed to clear CLOEXEC: %s\n"</span>,</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  progname, strerror(errno));</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  exit(1);</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  </div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">return</span> fuse_fd;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="preprocessor">#ifdef linux</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="keyword">static</span> uint64_t get_capabilities(<span class="keywordtype">void</span>)</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> {</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"> * This invokes the capset syscall directly to avoid the libcap</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment"> * dependency, which isn't really justified just for this.</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keyword">struct </span>__user_cap_header_struct header = {</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  .version = _LINUX_CAPABILITY_VERSION_3,</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  .pid = 0,</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  };</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keyword">struct </span>__user_cap_data_struct data[2];</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  memset(data, 0, <span class="keyword">sizeof</span>(data));</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">if</span> (syscall(SYS_capget, &header, data) == -1) {</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  fprintf(stderr, <span class="stringliteral">"%s: Failed to get capabilities: %s\n"</span>,</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  progname, strerror(errno));</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  exit(1);</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  }</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  </div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">return</span> data[0].effective | ((uint64_t) data[1].effective << 32);</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> }</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  </div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="keyword">static</span> <span class="keywordtype">void</span> set_capabilities(uint64_t caps)</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> {</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment"> * This invokes the capset syscall directly to avoid the libcap</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="comment"> * dependency, which isn't really justified just for this.</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keyword">struct </span>__user_cap_header_struct header = {</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  .version = _LINUX_CAPABILITY_VERSION_3,</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  .pid = 0,</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  };</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keyword">struct </span>__user_cap_data_struct data[2];</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  memset(data, 0, <span class="keyword">sizeof</span>(data));</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  data[0].effective = data[0].permitted = caps;</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  data[1].effective = data[1].permitted = caps >> 32;</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">if</span> (syscall(SYS_capset, &header, data) == -1) {</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  fprintf(stderr, <span class="stringliteral">"%s: Failed to set capabilities: %s\n"</span>,</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  progname, strerror(errno));</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  exit(1);</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  }</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> }</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  </div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="keyword">static</span> <span class="keywordtype">void</span> drop_and_lock_capabilities(<span class="keywordtype">void</span>)</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> {</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="comment">/* Set and lock securebits. */</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keywordflow">if</span> (prctl(PR_SET_SECUREBITS,</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  SECBIT_KEEP_CAPS_LOCKED |</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  SECBIT_NO_SETUID_FIXUP |</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  SECBIT_NO_SETUID_FIXUP_LOCKED |</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  SECBIT_NOROOT |</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  SECBIT_NOROOT_LOCKED) == -1) {</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  fprintf(stderr, <span class="stringliteral">"%s: Failed to set securebits %s\n"</span>,</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  progname, strerror(errno));</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  exit(1);</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  }</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  </div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="comment">/* Clear the capability bounding set. */</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordtype">int</span> cap;</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keywordflow">for</span> (cap = 0; ; cap++) {</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordtype">int</span> cap_status = prctl(PR_CAPBSET_READ, cap);</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keywordflow">if</span> (cap_status == 0) {</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  }</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">if</span> (cap_status == -1 && errno == EINVAL) {</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  }</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  </div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">if</span> (cap_status != 1) {</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  fprintf(stderr,</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="stringliteral">"%s: Failed to get capability %u: %s\n"</span>,</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  progname, cap, strerror(errno));</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  exit(1);</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  }</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordflow">if</span> (prctl(PR_CAPBSET_DROP, cap) == -1) {</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  fprintf(stderr,</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="stringliteral">"%s: Failed to drop capability %u: %s\n"</span>,</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  progname, cap, strerror(errno));</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  }</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  }</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  </div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="comment">/* Drop capabilities. */</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  set_capabilities(0);</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  </div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="comment">/* Prevent re-acquisition of privileges. */</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keywordflow">if</span> (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1) {</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  fprintf(stderr, <span class="stringliteral">"%s: Failed to set no_new_privs: %s\n"</span>,</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  progname, strerror(errno));</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  exit(1);</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  }</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> }</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  </div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> {</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="keywordtype">char</span> *type = NULL;</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keywordtype">char</span> *source;</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keywordtype">char</span> *dup_source = NULL;</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *mountpoint;</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordtype">char</span> *basename;</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordtype">char</span> *options = NULL;</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="keywordtype">char</span> *command = NULL;</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keywordtype">char</span> *setuid_name = NULL;</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordtype">int</span> dev = 1;</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keywordtype">int</span> suid = 1;</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordtype">int</span> pass_fuse_fd = 0;</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordtype">int</span> fuse_fd = 0;</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordtype">int</span> drop_privileges = 0;</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keywordtype">char</span> *dev_fd_mountpoint = NULL;</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  </div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  progname = argv[0];</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  basename = strrchr(argv[0], <span class="charliteral">'/'</span>);</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keywordflow">if</span> (basename)</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  basename++;</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  basename = argv[0];</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  </div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keywordflow">if</span> (strncmp(basename, <span class="stringliteral">"mount.fuse."</span>, 11) == 0)</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  type = basename + 11;</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">if</span> (strncmp(basename, <span class="stringliteral">"mount.fuseblk."</span>, 14) == 0)</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  type = basename + 14;</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  </div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keywordflow">if</span> (type && !type[0])</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  type = NULL;</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  </div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">if</span> (argc < 3) {</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  fprintf(stderr,</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="stringliteral">"usage: %s %s destination [-t type] [-o opt[,opts...]]\n"</span>,</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  progname, type ? <span class="stringliteral">"source"</span> : <span class="stringliteral">"type#[source]"</span>);</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  exit(1);</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  }</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  </div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  source = argv[1];</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keywordflow">if</span> (!source[0])</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  source = NULL;</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  </div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  mountpoint = argv[2];</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  </div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordflow">for</span> (i = 3; i < argc; i++) {</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordflow">if</span> (strcmp(argv[i], <span class="stringliteral">"-v"</span>) == 0) {</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strcmp(argv[i], <span class="stringliteral">"-t"</span>) == 0) {</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  i++;</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  </div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keywordflow">if</span> (i == argc) {</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  fprintf(stderr,</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="stringliteral">"%s: missing argument to option '-t'\n"</span>,</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  progname);</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  exit(1);</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  }</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  type = argv[i];</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  <span class="keywordflow">if</span> (strncmp(type, <span class="stringliteral">"fuse."</span>, 5) == 0)</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  type += 5;</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strncmp(type, <span class="stringliteral">"fuseblk."</span>, 8) == 0)</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  type += 8;</div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  </div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="keywordflow">if</span> (!type[0]) {</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  fprintf(stderr,</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="stringliteral">"%s: empty type given as argument to option '-t'\n"</span>,</div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  progname);</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  exit(1);</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  }</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strcmp(argv[i], <span class="stringliteral">"-o"</span>) == 0) {</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordtype">char</span> *opts;</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordtype">char</span> *opt;</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  i++;</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <span class="keywordflow">if</span> (i == argc)</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  </div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  opts = xstrdup(argv[i]);</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  opt = strtok(opts, <span class="stringliteral">","</span>);</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keywordflow">while</span> (opt) {</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <span class="keywordtype">int</span> j;</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="keywordtype">int</span> ignore = 0;</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *ignore_opts[] = { <span class="stringliteral">""</span>,</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="stringliteral">"user"</span>,</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <span class="stringliteral">"nofail"</span>,</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  <span class="stringliteral">"nouser"</span>,</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="stringliteral">"users"</span>,</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <span class="stringliteral">"auto"</span>,</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="stringliteral">"noauto"</span>,</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  <span class="stringliteral">"_netdev"</span>,</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  NULL};</div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="keywordflow">if</span> (strncmp(opt, <span class="stringliteral">"setuid="</span>, 7) == 0) {</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  setuid_name = xstrdup(opt + 7);</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  ignore = 1;</div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strcmp(opt,</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <span class="stringliteral">"drop_privileges"</span>) == 0) {</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  pass_fuse_fd = 1;</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  drop_privileges = 1;</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  ignore = 1;</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  }</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <span class="keywordflow">for</span> (j = 0; ignore_opts[j]; j++)</div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordflow">if</span> (strcmp(opt, ignore_opts[j]) == 0)</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  ignore = 1;</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  </div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="keywordflow">if</span> (!ignore) {</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  <span class="keywordflow">if</span> (strcmp(opt, <span class="stringliteral">"nodev"</span>) == 0)</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  dev = 0;</div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strcmp(opt, <span class="stringliteral">"nosuid"</span>) == 0)</div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  suid = 0;</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  </div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  options = add_option(opt, options);</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  }</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  opt = strtok(NULL, <span class="stringliteral">","</span>);</div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  }</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  free(opts);</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  }</div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  }</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  </div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keywordflow">if</span> (drop_privileges) {</div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  uint64_t required_caps = CAP_TO_MASK(CAP_SETPCAP) |</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  CAP_TO_MASK(CAP_SYS_ADMIN);</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  <span class="keywordflow">if</span> ((get_capabilities() & required_caps) != required_caps) {</div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  fprintf(stderr, <span class="stringliteral">"%s: drop_privileges was requested, which launches the FUSE file system fully unprivileged. In order to do so %s must be run with privileges, please invoke with CAP_SYS_ADMIN and CAP_SETPCAP (e.g. as root).\n"</span>,</div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  progname, progname);</div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  exit(1);</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  }</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  }</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  </div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  <span class="keywordflow">if</span> (dev)</div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  options = add_option(<span class="stringliteral">"dev"</span>, options);</div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="keywordflow">if</span> (suid)</div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  options = add_option(<span class="stringliteral">"suid"</span>, options);</div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  </div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  <span class="keywordflow">if</span> (!type) {</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <span class="keywordflow">if</span> (source) {</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  dup_source = xstrdup(source);</div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  type = dup_source;</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  source = strchr(type, <span class="charliteral">'#'</span>);</div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  <span class="keywordflow">if</span> (source)</div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  *source++ = <span class="charliteral">'\0'</span>;</div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  <span class="keywordflow">if</span> (!type[0]) {</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  fprintf(stderr, <span class="stringliteral">"%s: empty filesystem type\n"</span>,</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  progname);</div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  exit(1);</div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  }</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  fprintf(stderr, <span class="stringliteral">"%s: empty source\n"</span>, progname);</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  exit(1);</div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  }</div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  }</div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  </div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  <span class="keywordflow">if</span> (setuid_name && setuid_name[0]) {</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span> <span class="preprocessor">#ifdef linux</span></div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  <span class="keywordflow">if</span> (drop_privileges) {</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span> <span class="comment"> * Make securebits more permissive before calling</span></div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> <span class="comment"> * setuid(). Specifically, if SECBIT_KEEP_CAPS and</span></div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span> <span class="comment"> * SECBIT_NO_SETUID_FIXUP weren't set, setuid() would</span></div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span> <span class="comment"> * have the side effect of dropping all capabilities,</span></div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span> <span class="comment"> * and we need to retain CAP_SETPCAP in order to drop</span></div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span> <span class="comment"> * all privileges before exec().</span></div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  <span class="keywordflow">if</span> (prctl(PR_SET_SECUREBITS,</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  SECBIT_KEEP_CAPS |</div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  SECBIT_NO_SETUID_FIXUP) == -1) {</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  fprintf(stderr,</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  <span class="stringliteral">"%s: Failed to set securebits %s\n"</span>,</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  progname, strerror(errno));</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  exit(1);</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  }</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  }</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  </div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  <span class="keyword">struct </span>passwd *pwd = getpwnam(setuid_name);</div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  <span class="keywordflow">if</span> (!pwd || setgid(pwd->pw_gid) == -1 || setuid(pwd->pw_uid) == -1) {</div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  fprintf(stderr, <span class="stringliteral">"%s: Failed to setuid to %s: %s\n"</span>,</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  progname, setuid_name, strerror(errno));</div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  exit(1);</div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  }</div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!getenv(<span class="stringliteral">"HOME"</span>)) {</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  <span class="comment">/* Hack to make filesystems work in the boot environment */</span></div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  setenv(<span class="stringliteral">"HOME"</span>, <span class="stringliteral">"/root"</span>, 0);</div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  }</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  </div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  <span class="keywordflow">if</span> (pass_fuse_fd) {</div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  fuse_fd = prepare_fuse_fd(mountpoint, type, options);</div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  dev_fd_mountpoint = xrealloc(NULL, 20);</div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  snprintf(dev_fd_mountpoint, 20, <span class="stringliteral">"/dev/fd/%u"</span>, fuse_fd);</div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  mountpoint = dev_fd_mountpoint;</div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  }</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  </div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span> <span class="preprocessor">#ifdef linux</span></div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  <span class="keywordflow">if</span> (drop_privileges) {</div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  drop_and_lock_capabilities();</div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  }</div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  add_arg(&command, type);</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  <span class="keywordflow">if</span> (source)</div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  add_arg(&command, source);</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  add_arg(&command, mountpoint);</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  <span class="keywordflow">if</span> (options) {</div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  add_arg(&command, <span class="stringliteral">"-o"</span>);</div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  add_arg(&command, options);</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  }</div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  </div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  free(options);</div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  free(dev_fd_mountpoint);</div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  free(dup_source);</div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  free(setuid_name);</div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  </div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  execl(<span class="stringliteral">"/bin/sh"</span>, <span class="stringliteral">"/bin/sh"</span>, <span class="stringliteral">"-c"</span>, command, NULL);</div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  fprintf(stderr, <span class="stringliteral">"%s: failed to execute /bin/sh: %s\n"</span>, progname,</div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  strerror(errno));</div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  </div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  <span class="keywordflow">if</span> (pass_fuse_fd)</div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  close(fuse_fd);</div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  free(command);</div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span> }</div>
<div class="ttc" id="afuse-3_810_84_2include_2fuse_8h_html_a9e8c9af40b22631f9f2636019cd073b6"><div class="ttname"><a href="fuse-3_810_84_2include_2fuse_8h.html#a9e8c9af40b22631f9f2636019cd073b6">fuse_open_channel</a></div><div class="ttdeci">int fuse_open_channel(const char *mountpoint, const char *options)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_810_84_2lib_2helper_8c_source.html#l00424">helper.c:424</a></div></div>
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