ntdll: Only free reserved memory for HIGH_ENTROPY_VA binaries.

To avoid triggering pointer-truncation bugs in applications.

ntdll: Only free reserved memory for HIGH_ENTROPY_VA binaries.
f03c3a16 · Alexandre Julliard · 6e9728be · f03c3a16
Commit f03c3a16 authored Dec 08, 2023 by Alexandre Julliard
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virtual.c dlls/ntdll/unix/virtual.c +1 -1

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--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -4397,7 +4397,7 @@ void virtual_set_large_address_space(void)
        if (is_wow64())
            user_space_wow_limit = ((main_image_info.ImageCharacteristics & IMAGE_FILE_LARGE_ADDRESS_AWARE) ? limit_4g : limit_2g) - 1;
 #ifndef __APPLE__  /* don't free the zerofill section on macOS */
-        else
+        else if (main_image_info.DllCharacteristics & IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA)
            free_reserved_memory( 0, (char *)0x7ffe0000 );
 #endif
    }