[compiler-rt] [compiler-rt][rtsan] chroot interception. (PR #125932)

[David CARLIER via llvm-commits]

https://github.com/devnexen created https://github.com/llvm/llvm-project/pull/125932

None

>From c84f26184384ec543d91aabf8b01e95b2c518b74 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen at gmail.com>
Date: Wed, 5 Feb 2025 21:01:14 +0000
Subject: [PATCH] [compiler-rt][rtsan] chroot interception.

---
 compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp          | 6 ++++++
 .../lib/rtsan/tests/rtsan_test_interceptors_posix.cpp       | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp b/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
index 83e6cdd4a00941..6d961d0d84e645 100644
--- a/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
+++ b/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
@@ -254,6 +254,11 @@ INTERCEPTOR(int, fchdir, int fd) {
   return REAL(fchdir)(fd);
 }
 
+INTERCEPTOR(int, chroot, const char *path) {
+  __rtsan_notify_intercepted_call("chroot");
+  return REAL(chroot)(path);
+}
+
 // Streams
 
 INTERCEPTOR(FILE *, fopen, const char *path, const char *mode) {
@@ -1402,6 +1407,7 @@ void __rtsan::InitializeInterceptors() {
   INTERCEPT_FUNCTION(close);
   INTERCEPT_FUNCTION(chdir);
   INTERCEPT_FUNCTION(fchdir);
+  INTERCEPT_FUNCTION(chroot);
   INTERCEPT_FUNCTION(fopen);
   RTSAN_MAYBE_INTERCEPT_FOPEN64;
   RTSAN_MAYBE_INTERCEPT_FREOPEN64;
diff --git a/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp b/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
index 075f5974b7562a..dba5e18e436a41 100644
--- a/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
+++ b/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
@@ -457,6 +457,12 @@ TEST(TestRtsanInterceptors, FchdirDiesWhenRealtime) {
   ExpectNonRealtimeSurvival(Func);
 }
 
+TEST(TestRtsanInterceptors, ChrootDiesWhenRealtime) {
+  auto Func = []() { chroot("."); };
+  ExpectRealtimeDeath(Func, "chroot");
+  ExpectNonRealtimeSurvival(Func);
+}
+
 TEST_F(RtsanFileTest, FopenDiesWhenRealtime) {
   auto Func = [this]() {
     FILE *f = fopen(GetTemporaryFilePath(), "w");