clang/test/Analysis/errno-stdlibraryfunctions.c

   1 // RUN: %clang_analyze_cc1 -verify %s \
   2 // RUN:   -analyzer-checker=core \
   3 // RUN:   -analyzer-checker=debug.ExprInspection \
   4 // RUN:   -analyzer-checker=unix.StdCLibraryFunctions \
   5 // RUN:   -analyzer-checker=apiModeling.Errno \
   6 // RUN:   -analyzer-checker=unix.Errno \
   7 // RUN:   -analyzer-config unix.StdCLibraryFunctions:ModelPOSIX=true
   8
   9 #include "Inputs/errno_var.h"
  10 #include "Inputs/std-c-library-functions-POSIX.h"
  11
  12 #define NULL ((void *) 0)
  13
  14 void clang_analyzer_warnIfReached();
  15 void clang_analyzer_eval(int);
  16
  17 int unsafe_errno_read(int sock, void *data, int data_size) {
  18   if (send(sock, data, data_size, 0) != data_size) {
  19     if (errno == 1) {
  20       // expected-warning@-1{{An undefined value may be read from 'errno'}}
  21       return 0;
  22     }
  23   }
  24   return 1;
  25 }
  26
  27 int errno_lseek(int fildes, off_t offset) {
  28   off_t result = lseek(fildes, offset, 0);
  29   if (result == (off_t)-1) {
  30     // Failure path.
  31     // check if the function is modeled
  32     clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
  33     return 2;
  34   }
  35   if (result != offset) {
  36     // Not success path (?)
  37     // not sure if this is a valid case, allow to check 'errno'
  38     if (errno == 1) { // no warning
  39       return 1;
  40     }
  41     clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
  42   }
  43   if (result == offset) {
  44     // The checker does not differentiate for this case.
  45     // In general case no relation exists between the arg 2 and the returned
  46     // value, only for SEEK_SET.
  47     if (errno == 1) { // no warning
  48       return 1;
  49     }
  50     clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
  51   }
  52   return 0;
  53 }
  54
  55 void errno_mkstemp(char *template) {
  56   int FD = mkstemp(template);
  57   if (FD >= 0) {
  58     if (errno) {}                    // expected-warning{{An undefined value may be read from 'errno'}}
  59     close(FD);
  60   } else {
  61     clang_analyzer_eval(FD == -1);   // expected-warning{{TRUE}}
  62     clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
  63     if (errno) {}                    // no warning
  64   }
  65 }
  66
  67 void errno_mkdtemp(char *template) {
  68   char *Dir = mkdtemp(template);
  69   if (Dir == NULL) {
  70     clang_analyzer_eval(errno != 0);      // expected-warning{{TRUE}}
  71     if (errno) {}                         // no warning
  72   } else {
  73     clang_analyzer_eval(Dir == template); // expected-warning{{TRUE}}
  74     if (errno) {}                         // expected-warning{{An undefined value may be read from 'errno'}}
  75   }
  76 }
  77
  78 typedef char* CHAR_PTR;
  79 void errno_mkdtemp2(CHAR_PTR template) {
  80   CHAR_PTR Dir = mkdtemp(template);
  81   if (Dir == NULL) {
  82     clang_analyzer_eval(errno != 0);      // expected-warning{{TRUE}}
  83     if (errno) {}                         // no warning
  84   } else {
  85     clang_analyzer_eval(Dir == template); // expected-warning{{TRUE}}
  86     if (errno) {}                         // expected-warning{{An undefined value may be read from 'errno'}}
  87   }
  88 }
  89
  90 typedef char const* CONST_CHAR_PTR;
  91 void errno_mkdtemp3(CHAR_PTR template) {
  92   CONST_CHAR_PTR Dir = mkdtemp(template);
  93   if (Dir == NULL) {
  94     clang_analyzer_eval(errno != 0);      // expected-warning{{TRUE}}
  95     if (errno) {}                         // no warning
  96   } else {
  97     clang_analyzer_eval(Dir == template); // expected-warning{{TRUE}}
  98     if (errno) {}                         // expected-warning{{An undefined value may be read from 'errno'}}
  99   }
 100 }
 101
 102 void errno_getcwd(char *Buf, size_t Sz) {
 103   char *Path = getcwd(Buf, Sz);
 104   if (Sz == 0) {
 105     clang_analyzer_eval(errno != 0);   // expected-warning{{TRUE}}
 106     clang_analyzer_eval(Path == NULL); // expected-warning{{TRUE}}
 107     if (errno) {}                      // no warning
 108   } else if (Path == NULL) {
 109     clang_analyzer_eval(errno != 0);   // expected-warning{{TRUE}}
 110     if (errno) {}                      // no warning
 111   } else {
 112     clang_analyzer_eval(Path == Buf);  // expected-warning{{TRUE}}
 113     if (errno) {}                      // expected-warning{{An undefined value may be read from 'errno'}}
 114   }
 115 }
 116
 117 void errno_execv(char *Path, char * Argv[]) {
 118   int Ret = execv(Path, Argv);
 119   clang_analyzer_eval(Ret == -1);  // expected-warning{{TRUE}}
 120   clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
 121   if (errno) {}                    // no warning
 122 }
 123
 124 void errno_execvp(char *File, char * Argv[]) {
 125   int Ret = execvp(File, Argv);
 126   clang_analyzer_eval(Ret == -1);  // expected-warning{{TRUE}}
 127   clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
 128   if (errno) {}                    // no warning
 129 }
 130
 131 void errno_popen(void) {
 132   FILE *F = popen("xxx", "r");
 133   if (!F) {
 134     clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
 135     if (errno) {}                    // no-warning
 136   } else {
 137     if (errno) {} // expected-warning{{An undefined value may be read from 'errno' [unix.Errno]}}
 138     pclose(F);
 139   }
 140 }
 141
 142 void errno_pclose(void) {
 143   FILE *F = popen("xx", "w");
 144   if (!F)
 145     return;
 146   int Ret = pclose(F);
 147   if (Ret == -1) {
 148     clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
 149     if (errno) {}                    // no-warning
 150   } else {
 151     clang_analyzer_eval(Ret >= 0);   // expected-warning{{TRUE}}
 152     if (errno) {} // expected-warning{{An undefined value may be read from 'errno'}}
 153   }
 154 }
 155
 156 void errno_realpath(char *Path, char *Buf) {
 157   char *Ret = realpath(Path, Buf);
 158   if (!Ret) {
 159     clang_analyzer_eval(errno != 0);  // expected-warning{{TRUE}}
 160     if (errno) {}                     // no-warning
 161   } else {
 162     if (errno) {} // expected-warning{{An undefined value may be read from 'errno'}}
 163   }
 164 }