[Sanitizer] Adding setvbuf in supported platforms and other stream buffer functions

- Enabling setvbuf interceptions for non NetBSD platforms.
- setbuf, setbuffer, setlinebuf as well.

Reviewers: vitalybuka, krytarowski	

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D54779

llvm-svn: 347426

compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc

@@ -7306,9 +7306,44 @@ INTERCEPTOR(int, setvbuf, __sanitizer_FILE *stream, char *buf, int mode,
   int ret = REAL(setvbuf)(stream, buf, mode, size);
   if (buf)
     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, size);
+  if (stream)
+      unpoison_file(stream);
   return ret;
 }
-#define INIT_SETVBUF COMMON_INTERCEPT_FUNCTION(setvbuf)
+
+INTERCEPTOR(void, setbuf, __sanitizer_FILE *stream, char *buf) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, setbuf, stream, buf);
+  REAL(setbuf)(stream, buf);
+  if (buf) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, __sanitizer_bufsiz);
+  }
+  if (stream)
+      unpoison_file(stream);
+}
+
+INTERCEPTOR(void, setbuffer, __sanitizer_FILE *stream, char *buf, int mode) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, setbuffer, stream, buf, mode);
+  REAL(setbuffer)(stream, buf, mode);
+  if (buf) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, __sanitizer_bufsiz);
+  }
+  if (stream)
+    unpoison_file(stream);
+}
+
+INTERCEPTOR(void, setlinebuf, __sanitizer_FILE *stream) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, setlinebuf, stream);
+  REAL(setlinebuf)(stream);
+  if (stream)
+    unpoison_file(stream);
+}
+#define INIT_SETVBUF COMMON_INTERCEPT_FUNCTION(setvbuf); \
+    COMMON_INTERCEPT_FUNCTION(setbuf); \
+    COMMON_INTERCEPT_FUNCTION(setbuffer); \
+    COMMON_INTERCEPT_FUNCTION(setlinebuf)
 #else
 #define INIT_SETVBUF
 #endif

compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h

@@ -516,7 +516,8 @@
 #define SANITIZER_INTERCEPT_TTYENT SI_NETBSD
 #define SANITIZER_INTERCEPT_PROTOENT SI_NETBSD
 #define SANITIZER_INTERCEPT_NETENT SI_NETBSD
-#define SANITIZER_INTERCEPT_SETVBUF SI_NETBSD
+#define SANITIZER_INTERCEPT_SETVBUF (SI_NETBSD || SI_FREEBSD || \
+  SI_LINUX || SI_MAC)
 #define SANITIZER_INTERCEPT_GETMNTINFO SI_NETBSD
 #define SANITIZER_INTERCEPT_MI_VECTOR_HASH SI_NETBSD
 

compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_netbsd.cc

@@ -266,6 +266,8 @@ const uptr sig_dfl = (uptr)SIG_DFL;
 const uptr sig_err = (uptr)SIG_ERR;
 const uptr sa_siginfo = (uptr)SA_SIGINFO;
 
+const unsigned long __sanitizer_bufsiz = BUFSIZ;
+
 int ptrace_pt_io = PT_IO;
 int ptrace_pt_lwpinfo = PT_LWPINFO;
 int ptrace_pt_set_event_mask = PT_SET_EVENT_MASK;

compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_netbsd.h

@@ -460,6 +460,8 @@ struct __sanitizer_ttyent {
   char *ty_class;
 };
 
+extern const unsigned long __sanitizer_bufsiz;
+
 #define IOC_NRBITS 8
 #define IOC_TYPEBITS 8
 #define IOC_SIZEBITS 14

compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cc

@@ -501,6 +501,8 @@ unsigned struct_ElfW_Phdr_sz = sizeof(Elf_Phdr);
   unsigned struct_sioc_vif_req_sz = sizeof(struct sioc_vif_req);
 #endif
 
+  const unsigned long __sanitizer_bufsiz = BUFSIZ;
+
   const unsigned IOCTL_NOT_PRESENT = 0;
 
   unsigned IOCTL_FIOASYNC = FIOASYNC;

compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h

@@ -1073,6 +1073,8 @@ struct __sanitizer_cookie_io_functions_t {
   extern unsigned struct_unimapinit_sz;
 #endif  // SANITIZER_LINUX && !SANITIZER_ANDROID
 
+  extern const unsigned long __sanitizer_bufsiz;
+
 #if (SANITIZER_LINUX || SANITIZER_FREEBSD) && !SANITIZER_ANDROID
   extern unsigned struct_audio_buf_info_sz;
   extern unsigned struct_ppp_stats_sz;

compiler-rt/test/sanitizer_common/TestCases/Posix/setvbuf.cc

@@ -1,5 +1,7 @@
 // RUN: %clangxx -O0 -g %s -o %t && %run %t 2>&1 | FileCheck %s
 
+// UNSUPPORTED: solaris
+
 #include <stdio.h>
 
 void print_something() {
@@ -7,6 +9,10 @@ void print_something() {
     printf("Hello world %zu\n", i);
 }
 
+void print_one_byte(char *buf) {
+  printf("First byte is %c\n", buf[0]);
+}
+
 void test_setbuf() {
   char buf[BUFSIZ];
 
@@ -17,6 +23,8 @@ void test_setbuf() {
   setbuf(stdout, buf);
 
   print_something();
+
+  print_one_byte(buf);
 }
 
 void test_setbuffer() {
@@ -29,6 +37,8 @@ void test_setbuffer() {
   setbuffer(stdout, buf, BUFSIZ);
 
   print_something();
+
+  print_one_byte(buf);
 }
 
 void test_setlinebuf() {
@@ -48,9 +58,13 @@ void test_setvbuf() {
 
   print_something();
 
+  print_one_byte(buf);
+
   setvbuf(stdout, buf, _IOFBF, BUFSIZ);
 
   print_something();
+
+  print_one_byte(buf);
 }
 
 int main(void) {