[PATCH] D42909: Add new interceptor: lstat(2)

[Kamil Rytarowski via Phabricator via llvm-commits]

krytarowski created this revision.
krytarowski added reviewers: joerg, vitalybuka.
krytarowski added a project: Sanitizers.
Herald added a subscriber: kubamracek.

lstat - get file status

Use it on NetBSD.

Sponsored by <The NetBSD Foundation>


Repository:
  rL LLVM

https://reviews.llvm.org/D42909

Files:
  lib/sanitizer_common/sanitizer_common_interceptors.inc
  lib/sanitizer_common/sanitizer_platform_interceptors.h
  test/sanitizer_common/TestCases/NetBSD/lstat.cc


Index: test/sanitizer_common/TestCases/NetBSD/lstat.cc
===================================================================
--- /dev/null
+++ test/sanitizer_common/TestCases/NetBSD/lstat.cc
@@ -0,0 +1,16 @@
+// RUN: %clangxx -O0 -g %s -o %t && %run %t
+
+#include <stdlib.h>
+#include <sys/stat.h>
+
+int main(void) {
+  struct stat st;
+
+  if (lstat("/dev/null", &st))
+    exit(1);
+
+  if (!S_ISCHR(st.st_mode))
+    exit(1);
+
+  return 0;
+}
Index: lib/sanitizer_common/sanitizer_platform_interceptors.h
===================================================================
--- lib/sanitizer_common/sanitizer_platform_interceptors.h
+++ lib/sanitizer_common/sanitizer_platform_interceptors.h
@@ -406,6 +406,7 @@
 
 #define SANITIZER_INTERCEPT_STAT \
   (SI_FREEBSD || SI_MAC || SI_ANDROID || SI_NETBSD || SI_SOLARIS)
+#define SANITIZER_INTERCEPT_LSTAT SI_NETBSD
 #define SANITIZER_INTERCEPT___XSTAT (!SANITIZER_INTERCEPT_STAT && SI_POSIX)
 #define SANITIZER_INTERCEPT___XSTAT64 SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT___LXSTAT SANITIZER_INTERCEPT___XSTAT
Index: lib/sanitizer_common/sanitizer_common_interceptors.inc
===================================================================
--- lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -91,6 +91,7 @@
 #define localtime __locatime50
 #define localtime_r __localtime_r50
 #define mktime __mktime50
+#define lstat __lstat50
 #define opendir __opendir30
 #define readdir __readdir30
 #define readdir_r __readdir_r30
@@ -6276,6 +6277,22 @@
 #define INIT_STAT
 #endif
 
+#if SANITIZER_INTERCEPT_LSTAT
+INTERCEPTOR(int, lstat, const char *path, void *buf) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, lstat, path, buf);
+  if (common_flags()->intercept_stat)
+    COMMON_INTERCEPTOR_READ_STRING(ctx, path, 0);
+  int res = REAL(lstat)(path, buf);
+  if (!res)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, __sanitizer::struct_stat_sz);
+  return res;
+}
+#define INIT_LSTAT COMMON_INTERCEPT_FUNCTION(lstat)
+#else
+#define INIT_LSTAT
+#endif
+
 #if SANITIZER_INTERCEPT___XSTAT
 INTERCEPTOR(int, __xstat, int version, const char *path, void *buf) {
   void *ctx;
@@ -6990,6 +7007,7 @@
   INIT_SEND_SENDTO;
   INIT_STAT;
   INIT_EVENTFD_READ_WRITE;
+  INIT_LSTAT;
   INIT___XSTAT;
   INIT___XSTAT64;
   INIT___LXSTAT;


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