https://github.com/vitalybuka updated
https://github.com/llvm/llvm-project/pull/75260
>From 2dad66c39ce65a06df39cd761362624b355951e3 Mon Sep 17 00:00:00 2001
From: Vitaly Buka <vitalyb...@google.com>
Date: Tue, 12 Dec 2023 16:20:07 -0800
Subject: [PATCH 1/4] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20ch?=
=?UTF-8?q?anges=20to=20main=20this=20commit=20is=20based=20on?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Created using spr 1.3.4
[skip ci]
---
.../TestCases/Posix/fork_threaded.cpp | 86 +++++++++++++++++++
.../sanitizer_common/sanitizer_specific.h | 16 ++++
2 files changed, 102 insertions(+)
create mode 100644
compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
diff --git
a/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
b/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
new file mode 100644
index 00000000000000..2264c558166388
--- /dev/null
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
@@ -0,0 +1,86 @@
+// RUN: %clangxx -O0 %s -o %t && %env_tool_opts=die_after_fork=0 %run %t
+
+// UNSUPPORTED: *
+
+// Forking in multithread environment is unsupported. However we already have
+// some workarounds, and will add more, so this is the test.
+
+#include <assert.h>
+#include <pthread.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "sanitizer_common/sanitizer_specific.h"
+
+static const size_t kBufferSize = 1 << 20;
+
+static void *background(void *arg) { return nullptr; }
+
+pthread_barrier_t bar;
+
+void CanDeadLock() {
+ // Don't bother with leaks, we try to trigger allocator or lsan deadlock.
+ __lsan::ScopedDisabler disable;
+ char *volatile p = new char[10];
+ __lsan_do_recoverable_leak_check();
+ delete[] p;
+}
+
+// Prevent stack buffer cleanup by instrumentation.
+#define NOSAN __attribute__((no_sanitize("address", "hwaddress", "memory")))
+
+NOSAN static void *inparent(void *arg) {
+ fprintf(stderr, "inparent %d\n", gettid());
+
+ char t[kBufferSize];
+ make_mem_bad(t, sizeof(t));
+
+ pthread_barrier_wait(&bar);
+
+ for (;;)
+ CanDeadLock();
+
+ return 0;
+}
+
+NOSAN static void *inchild(void *arg) {
+ char t[kBufferSize];
+ check_mem_is_good(t, sizeof(t));
+ CanDeadLock();
+ return 0;
+}
+
+int main(void) {
+ pid_t pid;
+
+ pthread_barrier_init(&bar, nullptr, 2);
+ pthread_t thread_id;
+ while (pthread_create(&thread_id, 0, &inparent, 0) != 0) {
+ }
+ pthread_barrier_wait(&bar);
+
+ pid = fork();
+ switch (pid) {
+ case -1:
+ perror("fork");
+ return -1;
+ case 0:
+ while (pthread_create(&thread_id, 0, &inchild, 0) != 0) {
+ }
+ break;
+ default: {
+ fprintf(stderr, "fork %d\n", pid);
+ int status;
+ while (waitpid(-1, &status, __WALL) != pid) {
+ }
+ assert(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+ break;
+ }
+ }
+
+ return 0;
+}
diff --git a/compiler-rt/test/sanitizer_common/sanitizer_specific.h
b/compiler-rt/test/sanitizer_common/sanitizer_specific.h
index 1a802020cfd668..963d91cb305f60 100644
--- a/compiler-rt/test/sanitizer_common/sanitizer_specific.h
+++ b/compiler-rt/test/sanitizer_common/sanitizer_specific.h
@@ -1,6 +1,12 @@
#ifndef __SANITIZER_COMMON_SANITIZER_SPECIFIC_H__
#define __SANITIZER_COMMON_SANITIZER_SPECIFIC_H__
+#include <sanitizer/lsan_interface.h>
+
+__attribute__((weak)) int __lsan_do_recoverable_leak_check() { return 0; }
+__attribute__((weak)) void __lsan_disable(void) {}
+__attribute__((weak)) void __lsan_enable(void) {}
+
#ifndef __has_feature
# define __has_feature(x) 0
#endif
@@ -10,6 +16,8 @@
static void check_mem_is_good(void *p, size_t s) {
__msan_check_mem_is_initialized(p, s);
}
+static void make_mem_good(void *p, size_t s) { __msan_unpoison(p, s); }
+static void make_mem_bad(void *p, size_t s) { __msan_poison(p, s); }
#elif __has_feature(address_sanitizer)
# include <sanitizer/asan_interface.h>
# include <stdlib.h>
@@ -17,8 +25,16 @@ static void check_mem_is_good(void *p, size_t s) {
if (__asan_region_is_poisoned(p, s))
abort();
}
+static void make_mem_good(void *p, size_t s) {
+ __asan_unpoison_memory_region(p, s);
+}
+static void make_mem_bad(void *p, size_t s) {
+ __asan_poison_memory_region(p, s);
+}
#else
static void check_mem_is_good(void *p, size_t s) {}
+static void make_mem_good(void *p, size_t s) {}
+static void make_mem_bad(void *p, size_t s) {}
#endif
#endif // __SANITIZER_COMMON_SANITIZER_SPECIFIC_H__
\ No newline at end of file
>From 5c4317f5610316cfe5550f1366e1323116529799 Mon Sep 17 00:00:00 2001
From: Vitaly Buka <vitalyb...@google.com>
Date: Tue, 12 Dec 2023 17:09:13 -0800
Subject: [PATCH 2/4] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20ch?=
=?UTF-8?q?anges=20introduced=20through=20rebase?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Created using spr 1.3.4
[skip ci]
---
compiler-rt/test/sanitizer_common/sanitizer_specific.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/compiler-rt/test/sanitizer_common/sanitizer_specific.h
b/compiler-rt/test/sanitizer_common/sanitizer_specific.h
index 963d91cb305f60..898899f00e3701 100644
--- a/compiler-rt/test/sanitizer_common/sanitizer_specific.h
+++ b/compiler-rt/test/sanitizer_common/sanitizer_specific.h
@@ -37,4 +37,4 @@ static void make_mem_good(void *p, size_t s) {}
static void make_mem_bad(void *p, size_t s) {}
#endif
-#endif // __SANITIZER_COMMON_SANITIZER_SPECIFIC_H__
\ No newline at end of file
+#endif // __SANITIZER_COMMON_SANITIZER_SPECIFIC_H__
>From 615540318e4c2968f2f08e9647c0660ca73f1459 Mon Sep 17 00:00:00 2001
From: Vitaly Buka <vitalyb...@google.com>
Date: Tue, 12 Dec 2023 17:15:57 -0800
Subject: [PATCH 3/4] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20ch?=
=?UTF-8?q?anges=20introduced=20through=20rebase?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Created using spr 1.3.4
[skip ci]
---
.../sanitizer_common/TestCases/Posix/fork_threaded.cpp | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git
a/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
b/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
index 052638438680f7..1e3a8ebf91d3d2 100644
--- a/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
@@ -4,6 +4,10 @@
// Forking in multithread environment is unsupported. However we already have
// some workarounds, and will add more, so this is the test.
+// The test try to check two things:
+// 1. Internal mutexes used by `inparent` thread do not deadlock `inchild`
+// thread.
+// 2. Stack poisoned by `inparent` is not poisoned in `inchild` thread.
#include <assert.h>
#include <pthread.h>
@@ -22,7 +26,7 @@ pthread_barrier_t bar;
// Without appropriate workarounds this code can cause the forked process to
// start with locked internal mutexes.
-void CanDeadLock() {
+void ShouldNotDeadlock() {
// Don't bother with leaks, we try to trigger allocator or lsan deadlock.
__lsan::ScopedDisabler disable;
char *volatile p = new char[10];
@@ -42,7 +46,7 @@ NOSAN static void *inparent(void *arg) {
pthread_barrier_wait(&bar);
for (;;)
- CanDeadLock();
+ ShouldNotDeadlock();
return 0;
}
@@ -50,7 +54,7 @@ NOSAN static void *inparent(void *arg) {
NOSAN static void *inchild(void *arg) {
char t[kBufferSize];
check_mem_is_good(t, sizeof(t));
- CanDeadLock();
+ ShouldNotDeadlock();
return 0;
}
>From bbd66c667a4836db5201c42ec39bc822c8fe10c4 Mon Sep 17 00:00:00 2001
From: Vitaly Buka <vitalyb...@google.com>
Date: Tue, 12 Dec 2023 19:43:21 -0800
Subject: [PATCH 4/4] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20ch?=
=?UTF-8?q?anges=20introduced=20through=20rebase?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Created using spr 1.3.4
[skip ci]
---
.../test/sanitizer_common/TestCases/Posix/fork_threaded.cpp | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git
a/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
b/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
index 1e3a8ebf91d3d2..667f81d2985335 100644
--- a/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.cpp
@@ -1,6 +1,6 @@
// RUN: %clangxx -O0 %s -o %t && %env_tool_opts=die_after_fork=0 %run %t
-// UNSUPPORTED: *
+// UNSUPPORTED: asan, hwasan, lsan, msan, tsan, ubsan
// Forking in multithread environment is unsupported. However we already have
// some workarounds, and will add more, so this is the test.
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