diff --git a/compiler-rt/lib/dfsan/dfsan_custom.cpp b/compiler-rt/lib/dfsan/dfsan_custom.cpp
--- a/compiler-rt/lib/dfsan/dfsan_custom.cpp
+++ b/compiler-rt/lib/dfsan/dfsan_custom.cpp
@@ -892,6 +892,21 @@
   return ret;
 }
 
+SANITIZER_INTERFACE_ATTRIBUTE int __dfsw_getsockname(
+    int sockfd, struct sockaddr *addr, socklen_t *addrlen,
+    dfsan_label sockfd_label, dfsan_label addr_label, dfsan_label addrlen_label,
+    dfsan_label *ret_label) {
+  socklen_t origlen = addrlen ? *addrlen : 0;
+  int ret = getsockname(sockfd, addr, addrlen);
+  if (ret != -1 && addr && addrlen) {
+    socklen_t written_bytes = origlen < *addrlen ? origlen : *addrlen;
+    dfsan_set_label(0, addrlen, sizeof(*addrlen));
+    dfsan_set_label(0, addr, written_bytes);
+  }
+  *ret_label = 0;
+  return ret;
+}
+
 // Type of the trampoline function passed to the custom version of
 // dfsan_set_write_callback.
 typedef void (*write_trampoline_t)(
diff --git a/compiler-rt/lib/dfsan/done_abilist.txt b/compiler-rt/lib/dfsan/done_abilist.txt
--- a/compiler-rt/lib/dfsan/done_abilist.txt
+++ b/compiler-rt/lib/dfsan/done_abilist.txt
@@ -192,6 +192,7 @@
 fun:gethostname=custom
 fun:getrlimit=custom
 fun:getrusage=custom
+fun:getsockname=custom
 fun:nanosleep=custom
 fun:pread=custom
 fun:read=custom
diff --git a/compiler-rt/test/dfsan/custom.cpp b/compiler-rt/test/dfsan/custom.cpp
--- a/compiler-rt/test/dfsan/custom.cpp
+++ b/compiler-rt/test/dfsan/custom.cpp
@@ -895,6 +895,26 @@
   ASSERT_READ_ZERO_LABEL(fd, sizeof(fd));
 }
 
+void test_getsockname() {
+  int sockfd = socket(AF_UNIX, SOCK_DGRAM, 0);
+  assert(sockfd != -1);
+
+  struct sockaddr addr = {};
+  socklen_t addrlen = sizeof(addr);
+  dfsan_set_label(i_label, &addr, addrlen);
+  dfsan_set_label(i_label, &addrlen, sizeof(addrlen));
+
+  int ret = getsockname(sockfd, &addr, &addrlen);
+  assert(ret != -1);
+  ASSERT_ZERO_LABEL(ret);
+  ASSERT_ZERO_LABEL(addrlen);
+  assert(addrlen < sizeof(addr));
+  ASSERT_READ_ZERO_LABEL(&addr, addrlen);
+  ASSERT_READ_LABEL(((char *)&addr) + addrlen, 1, i_label);
+
+  close(sockfd);
+}
+
 void test_write() {
   int fd = open("/dev/null", O_WRONLY);
 
@@ -1077,6 +1097,7 @@
   test_getpwuid_r();
   test_getrlimit();
   test_getrusage();
+  test_getsockname();
   test_gettimeofday();
   test_inet_pton();
   test_localtime_r();