experiment

gpkg/glibc/build.sh

@@ -16,7 +16,7 @@ termux_step_pre_configure() {
 		termux_error_exit "Compilation is only possible based on glibc"
 	fi
 
-	for i in shmem-android.h mprotect.c; do
+	for i in shmem-android.h; do
 		install -Dm644 "${TERMUX_PKG_BUILDER_DIR}/${i}" "${TERMUX_PKG_SRCDIR}/sysdeps/unix/sysv/linux/${i}"
 	done
 

gpkg/glibc/malloc.c.patch

@@ -0,0 +1,56 @@
+--- src/malloc/malloc.c	2023-07-31 20:54:16.000000000 +0300
++++ src/malloc/malloc.c.patch	2023-12-19 13:23:12.195766831 +0300
+@@ -1075,7 +1075,7 @@
+ #include <malloc.h>
+
+ #ifndef RETURN_ADDRESS
+-#define RETURN_ADDRESS(X_) (NULL)
++#define RETURN_ADDRESS(X_) mmap(NULL, X_, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
+ #endif
+
+ /* Forward declarations.  */
+@@ -3532,7 +3532,7 @@
+   if (!__malloc_initialized)
+     ptmalloc_init ();
+
+-  void *address = RETURN_ADDRESS (0);
++  void *address = RETURN_ADDRESS (bytes);
+   return _mid_memalign (alignment, bytes, address);
+ }
+ libc_hidden_def (__libc_memalign)
+@@ -3555,7 +3555,7 @@
+       return 0;
+     }
+
+-  void *address = RETURN_ADDRESS (0);
++  void *address = RETURN_ADDRESS (bytes);
+   return _mid_memalign (alignment, bytes, address);
+ }
+
+@@ -3655,7 +3655,7 @@
+   if (!__malloc_initialized)
+     ptmalloc_init ();
+
+-  void *address = RETURN_ADDRESS (0);
++  void *address = RETURN_ADDRESS (bytes);
+   size_t pagesize = GLRO (dl_pagesize);
+   return _mid_memalign (pagesize, bytes, address);
+ }
+@@ -3666,7 +3666,7 @@
+   if (!__malloc_initialized)
+     ptmalloc_init ();
+
+-  void *address = RETURN_ADDRESS (0);
++  void *address = RETURN_ADDRESS (bytes);
+   size_t pagesize = GLRO (dl_pagesize);
+   size_t rounded_bytes;
+   /* ALIGN_UP with overflow check.  */
+@@ -5901,7 +5901,7 @@
+     return EINVAL;
+
+
+-  void *address = RETURN_ADDRESS (0);
++  void *address = RETURN_ADDRESS (size);
+   mem = _mid_memalign (alignment, size, address);
+
+   if (mem != NULL)

gpkg/glibc/mprotect.c

@@ -96,7 +96,7 @@ int __mprotect(void *addr, size_t len, int prot) {
 			memcpy(caddr, addr, saddr);
 			free(addr);
 		}
-		addr = mmap(NULL, len*5, PROT_READ|PROT_WRITE, mmap_flags, -1, 0);
+		addr = mmap(NULL, len, PROT_READ|PROT_WRITE, mmap_flags, -1, 0);
 		if (saddr > 1) {
 			memcpy(addr, caddr, saddr);
 			free(caddr);