|
 |
8af166 |
Backported from LLVM upstream:
|
|
|
8af166 |
|
|
|
8af166 |
commit ef14b78d9a144ba81ba02083fe21eb286a88732b
|
|
|
8af166 |
Author: Florian Weimer <fweimer@redhat.com>
|
|
|
8af166 |
Date: Tue Feb 8 12:46:41 2022 -0800
|
|
|
8af166 |
|
|
|
8af166 |
[sanitizer] Use _thread_db_sizeof_pthread to obtain struct pthread size
|
|
|
8af166 |
|
|
|
8af166 |
This symbol has been exported (as an internal GLIBC_PRIVATE symbol) from libc.so.6 starting with glibc 2.34. glibc uses it internally for its libthread_db implementation to enable thread debugging on GDB, so it is unlikely to go away for now.
|
|
|
8af166 |
|
|
|
8af166 |
Fixes #52989.
|
|
|
8af166 |
|
|
|
8af166 |
Reviewed By: #sanitizers, MaskRay, vitalybuka
|
|
|
8af166 |
|
|
|
8af166 |
Differential Revision: https://reviews.llvm.org/D119007
|
|
|
8af166 |
|
|
|
8af166 |
--- a/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cpp
|
|
|
8af166 |
+++ b/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cpp
|
|
|
8af166 |
@@ -265,10 +265,8 @@ void InitTlsSize() { }
|
|
|
8af166 |
// sizeof(struct pthread) from glibc.
|
|
|
8af166 |
static atomic_uintptr_t thread_descriptor_size;
|
|
|
8af166 |
|
|
|
8af166 |
-uptr ThreadDescriptorSize() {
|
|
|
8af166 |
- uptr val = atomic_load_relaxed(&thread_descriptor_size);
|
|
|
8af166 |
- if (val)
|
|
|
8af166 |
- return val;
|
|
|
8af166 |
+static uptr ThreadDescriptorSizeFallback() {
|
|
|
8af166 |
+ uptr val = 0;
|
|
|
8af166 |
#if defined(__x86_64__) || defined(__i386__) || defined(__arm__)
|
|
|
8af166 |
int major;
|
|
|
8af166 |
int minor;
|
|
|
8af166 |
@@ -323,8 +321,21 @@ uptr ThreadDescriptorSize() {
|
|
|
8af166 |
#elif defined(__s390__)
|
|
|
8af166 |
val = FIRST_32_SECOND_64(1152, 1776); // valid for glibc 2.22
|
|
|
8af166 |
#endif
|
|
|
8af166 |
+ return val;
|
|
|
8af166 |
+}
|
|
|
8af166 |
+
|
|
|
8af166 |
+uptr ThreadDescriptorSize() {
|
|
|
8af166 |
+ uptr val = atomic_load_relaxed(&thread_descriptor_size);
|
|
|
8af166 |
if (val)
|
|
|
8af166 |
- atomic_store_relaxed(&thread_descriptor_size, val);
|
|
|
8af166 |
+ return val;
|
|
|
8af166 |
+ // _thread_db_sizeof_pthread is a GLIBC_PRIVATE symbol that is exported in
|
|
|
8af166 |
+ // glibc 2.34 and later.
|
|
|
8af166 |
+ if (unsigned *psizeof = static_cast<unsigned *>(
|
|
|
8af166 |
+ dlsym(RTLD_DEFAULT, "_thread_db_sizeof_pthread")))
|
|
|
8af166 |
+ val = *psizeof;
|
|
|
8af166 |
+ if (!val)
|
|
|
8af166 |
+ val = ThreadDescriptorSizeFallback();
|
|
|
8af166 |
+ atomic_store_relaxed(&thread_descriptor_size, val);
|
|
|
8af166 |
return val;
|
|
|
8af166 |
}
|
|
|
8af166 |
|