[compiler-rt] [compiler-rt][rtsan] preadv(64)/pwritev(64) interception. (PR #124115)

[David CARLIER via llvm-commits]

https://github.com/devnexen created https://github.com/llvm/llvm-project/pull/124115

None

>From 2f6b14544deaf49b688894d0abe459b38c2af156 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen at gmail.com>
Date: Thu, 23 Jan 2025 13:45:06 +0000
Subject: [PATCH] [compiler-rt][rtsan] preadv(64)/pwritev(64) interception.

---
 .../lib/rtsan/rtsan_interceptors_posix.cpp    | 48 +++++++++++++++++++
 .../tests/rtsan_test_interceptors_posix.cpp   | 24 ++++++++++
 2 files changed, 72 insertions(+)

diff --git a/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp b/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
index a01354781272d5..28369c51e1269f 100644
--- a/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
+++ b/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
@@ -520,6 +520,50 @@ INTERCEPTOR(ssize_t, pwrite64, int fd, const void *buf, size_t count,
 #define RTSAN_MAYBE_INTERCEPT_PWRITE64
 #endif // SANITIZER_INTERCEPT_PWRITE64
 
+#if SANITIZER_INTERCEPT_PREADV
+INTERCEPTOR(ssize_t, preadv, int fd, const struct iovec *iov, int count,
+            off_t offset) {
+  __rtsan_notify_intercepted_call("preadv");
+  return REAL(preadv)(fd, iov, count, offset);
+}
+#define RTSAN_MAYBE_INTERCEPT_PREADV INTERCEPT_FUNCTION(preadv)
+#else
+#define RTSAN_MAYBE_INTERCEPT_PREADV
+#endif
+
+#if SANITIZER_INTERCEPT_PREADV64
+INTERCEPTOR(ssize_t, preadv64, int fd, const struct iovec *iov, int count,
+            off_t offset) {
+  __rtsan_notify_intercepted_call("preadv64");
+  return REAL(preadv)(fd, iov, count, offset);
+}
+#define RTSAN_MAYBE_INTERCEPT_PREADV64 INTERCEPT_FUNCTION(preadv64)
+#else
+#define RTSAN_MAYBE_INTERCEPT_PREADV64
+#endif
+
+#if SANITIZER_INTERCEPT_PWRITEV
+INTERCEPTOR(ssize_t, pwritev, int fd, const struct iovec *iov, int count,
+            off_t offset) {
+  __rtsan_notify_intercepted_call("pwritev");
+  return REAL(pwritev)(fd, iov, count, offset);
+}
+#define RTSAN_MAYBE_INTERCEPT_PWRITEV INTERCEPT_FUNCTION(pwritev)
+#else
+#define RTSAN_MAYBE_INTERCEPT_PWRITEV
+#endif
+
+#if SANITIZER_INTERCEPT_PWRITEV64
+INTERCEPTOR(ssize_t, pwritev64, int fd, const struct iovec *iov, int count,
+            off_t offset) {
+  __rtsan_notify_intercepted_call("pwritev64");
+  return REAL(pwritev64)(fd, iov, count, offset);
+}
+#define RTSAN_MAYBE_INTERCEPT_PWRITEV64 INTERCEPT_FUNCTION(pwritev64)
+#else
+#define RTSAN_MAYBE_INTERCEPT_PWRITEV64
+#endif
+
 INTERCEPTOR(ssize_t, writev, int fd, const struct iovec *iov, int iovcnt) {
   __rtsan_notify_intercepted_call("writev");
   return REAL(writev)(fd, iov, iovcnt);
@@ -1265,9 +1309,13 @@ void __rtsan::InitializeInterceptors() {
   INTERCEPT_FUNCTION(write);
   INTERCEPT_FUNCTION(pread);
   RTSAN_MAYBE_INTERCEPT_PREAD64;
+  RTSAN_MAYBE_INTERCEPT_PREADV;
+  RTSAN_MAYBE_INTERCEPT_PREADV64;
   INTERCEPT_FUNCTION(readv);
   INTERCEPT_FUNCTION(pwrite);
   RTSAN_MAYBE_INTERCEPT_PWRITE64;
+  RTSAN_MAYBE_INTERCEPT_PWRITEV;
+  RTSAN_MAYBE_INTERCEPT_PWRITEV64;
   INTERCEPT_FUNCTION(writev);
   INTERCEPT_FUNCTION(fwrite);
   INTERCEPT_FUNCTION(fclose);
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 981766c85f965e..cd62a3c57c6f9c 100644
--- a/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
+++ b/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
@@ -879,6 +879,30 @@ TEST_F(RtsanOpenedFileTest, PreadDiesWhenRealtime) {
   ExpectNonRealtimeSurvival(Func);
 }
 
+#if SANITIZER_INTERCEPT_PREADV
+TEST_F(RtsanOpenedFileTest, PreadvDiesWhenRealtime) {
+  auto Func = [this]() {
+    char c{};
+    iovec iov{&c, sizeof(c)};
+    preadv(GetOpenFd(), &iov, 1, 0);
+  };
+  ExpectRealtimeDeath(Func, MAYBE_APPEND_64("preadv"));
+  ExpectNonRealtimeSurvival(Func);
+}
+#endif
+
+#if SANITIZER_INTERCEPT_PWRITEV
+TEST_F(RtsanOpenedFileTest, PwritevDiesWhenRealtime) {
+  auto Func = [this]() {
+    char c{};
+    iovec iov{&c, sizeof(c)};
+    pwritev(GetOpenFd(), &iov, 1, 0);
+  };
+  ExpectRealtimeDeath(Func, MAYBE_APPEND_64("pwritev"));
+  ExpectNonRealtimeSurvival(Func);
+}
+#endif
+
 TEST_F(RtsanOpenedFileTest, ReadvDiesWhenRealtime) {
   auto Func = [this]() {
     char c{};