From 1f1df4f4378bb87bb1b480593cd77669fcd56ec7 Mon Sep 17 00:00:00 2001
From: evgeny <evgeny@adaptto.ru>
Date: Wed, 16 Sep 2026 21:12:46 +0300
Subject: [PATCH] =?UTF-8?q?mem:=20=D0=B4=D0=B5=D1=82=D0=B5=D0=BA=D1=82=20?=
 =?UTF-8?q?=D0=B0=D0=BD=D0=BE=D0=BC=D0=B0=D0=BB=D1=8C=D0=BD=D0=BE=20=D0=B1?=
 =?UTF-8?q?=D0=BE=D0=BB=D1=8C=D1=88=D0=B8=D1=85=20=D0=B0=D0=BB=D0=BB=D0=BE?=
 =?UTF-8?q?=D0=BA=D0=B0=D1=86=D0=B8=D0=B9=20(LARGE=20ALLOC=20log=20+=20cal?=
 =?UTF-8?q?loc=20overflow=20guard)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 lib/mem.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/mem.c b/lib/mem.c
index 6391cf65..a100e97a 100644
--- a/lib/mem.c
+++ b/lib/mem.c
@@ -18,6 +18,9 @@
 #define PREV_OFFSET LOCATION_MAX
 #define NEXT_OFFSET (LOCATION_MAX + POINTER_SIZE)
 
+// Порог детекта аномально больших аллокаций (гигантские mmap-резервации, напр. VSZ ~4G)
+#define LARGE_ALLOC_LOG_THRESHOLD (8u * 1024u * 1024u)  // 8 МБ
+
 #if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__)
 #include <execinfo.h>
 #include <pthread.h>
@@ -121,6 +124,10 @@ void u_check(void* ptr, const char* text, const char* location) {
 }
 
 void* u_malloc_impl(uint32_t size, const char* location) {
+    if (size >= LARGE_ALLOC_LOG_THRESHOLD) {
+        DEBUG_WARN(DEBUG_CATEGORY_SYS, "LARGE ALLOC: %u bytes (%.1f MB) at %s",
+                   size, (double)size / (1024.0 * 1024.0), location);
+    }
     uint32_t total = size + 12 + 2 * BOUNDARY_CHECK_SIZE + METADATA_SIZE;
     uint8_t* base = (uint8_t*)malloc(total);
     if (!base && size > 0) return NULL;
@@ -151,6 +158,10 @@ void* u_malloc_impl(uint32_t size, const char* location) {
 }
 
 void* u_calloc_impl(uint32_t nmemb, uint32_t size, const char* location) {
+    if (nmemb != 0 && size > UINT32_MAX / nmemb) {
+        DEBUG_ERROR(DEBUG_CATEGORY_SYS, "CALLOC OVERFLOW: %u * %u (wraps uint32) at %s", nmemb, size, location);
+        return NULL;
+    }
     uint32_t total_size = nmemb * size;
     void* ptr = u_malloc_impl(total_size, location);
     if (ptr) memset(ptr, 0, total_size);