Export of internal Abseil changes

--
b2a781121ff72fb485b7e67539d5e4ff1eb66df2 by Gennadiy Rozental <rogeeff@google.com>:

Consistently use absl::flat_hash_map instead of std::map in Flags implementation.

PiperOrigin-RevId: 377132816

--
9ab83a154d8f22d51fed0092bf94245b5af1f498 by Derek Mauro <dmauro@google.com>:

Workaround for MSAN being unable to see through getentropy().

https://github.com/google/sanitizers/issues/1173

PiperOrigin-RevId: 377097059

--
8d28e921442d1b246c26f3200f21027557c47657 by Greg Falcon <gfalcon@google.com>:

Disable stack_consumption_test in tsan builds.

A recent tsan change broke the way this test-only utility was counting stack usage.

PiperOrigin-RevId: 377053169
GitOrigin-RevId: b2a781121ff72fb485b7e67539d5e4ff1eb66df2
Change-Id: Ib56356f8128f6c083f32b950091f3a56d9e2cd51

1 files changed, 4 insertions, 0 deletions

diff --git a/absl/random/internal/seed_material.cc b/absl/random/internal/seed_material.cc
index 0fcba509..7c1d9efa 100644
--- a/absl/random/internal/seed_material.cc
+++ b/absl/random/internal/seed_material.cc
@@ -28,6 +28,7 @@
 #include <cstdlib>
 #include <cstring>
 
+#include "absl/base/dynamic_annotations.h"
 #include "absl/base/internal/raw_logging.h"
 #include "absl/strings/ascii.h"
 #include "absl/strings/escaping.h"
@@ -142,6 +143,9 @@ bool ReadSeedMaterialFromGetEntropy(absl::Span<uint32_t> values) {
     if (result < 0) {
       return false;
     }
+    // https://github.com/google/sanitizers/issues/1173
+    // MemorySanitizer can't see through getentropy().
+    ABSL_ANNOTATE_MEMORY_IS_INITIALIZED(buffer, to_read);
     buffer += to_read;
     buffer_size -= to_read;
   }