Add new NetBSD interceptors: getgrouplist(3) & getgroupmembership(3)

Summary:
getgrouplist, getgroupmembership -- calculate group access list

Sponsored by <The NetBSD Foundation>

Reviewers: vitalybuka, joerg

Reviewed By: vitalybuka

Subscribers: llvm-commits, kubamracek, #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D42064

llvm-svn: 322836

1 files changed, 41 insertions, 0 deletions

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
index 71e6aa8e342..f74aff77453 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -6566,6 +6566,46 @@ INTERCEPTOR(int, faccessat, int fd, const char *path, int mode, int flags) {
 #define INIT_FACCESSAT
 #endif
 
+#if SANITIZER_INTERCEPT_GETGROUPLIST
+INTERCEPTOR(int, getgrouplist, const char *name, u32 basegid, u32 *groups,
+            int *ngroups) {
+  void *ctx;
+  int res;
+  COMMON_INTERCEPTOR_ENTER(ctx, getgrouplist, name, basegid, groups, ngroups);
+  if (name)
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  if (ngroups)
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, ngroups, sizeof(*ngroups));
+  res = REAL(getgrouplist)(name, basegid, groups, ngroups);
+  if (!res && groups && ngroups) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, groups, sizeof(*groups) * (*ngroups));
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ngroups, sizeof(*ngroups));
+  }
+  return res;
+}
+
+INTERCEPTOR(int, getgroupmembership, const char *name, u32 basegid, u32 *groups,
+            int maxgrp, int *ngroups) {
+  void *ctx;
+  int res;
+  COMMON_INTERCEPTOR_ENTER(ctx, getgroupmembership, name, basegid, groups, maxgrp, ngroups);
+  if (name)
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  res = REAL(getgroupmembership)(name, basegid, groups, maxgrp, ngroups);
+  if (!res && groups && ngroups) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, groups, sizeof(*groups) * (*ngroups));
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ngroups, sizeof(*ngroups));
+  }
+  return res;
+}
+
+#define INIT_GETGROUPLIST \
+  COMMON_INTERCEPT_FUNCTION(getgrouplist); \
+  COMMON_INTERCEPT_FUNCTION(getgroupmembership);
+#else
+#define INIT_GETGROUPLIST
+#endif
+
 static void InitializeCommonInterceptors() {
   static u64 metadata_mem[sizeof(MetadataHashMap) / sizeof(u64) + 1];
   interceptor_metadata_map = new((void *)&metadata_mem) MetadataHashMap();
@@ -6784,6 +6824,7 @@ static void InitializeCommonInterceptors() {
   INIT_GID_FROM_GROUP;
   INIT_ACCESS;
   INIT_FACCESSAT;
+  INIT_GETGROUPLIST;
 
 #if SANITIZER_NETBSD
   COMMON_INTERCEPT_FUNCTION(__libc_mutex_lock);