[vlc-devel] [PATCH] winvlc: Try to load DLLs from system32 before any other folder

[Steve Lhomme]

On Fri, Mar 10, 2017 at 2:49 PM, Hugo Beauzée-Luyssen <hugo at beauzee.fr> wrote:
> ---
>  bin/winvlc.c | 36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
>
> diff --git a/bin/winvlc.c b/bin/winvlc.c
> index ce44f5dd29..085a908fed 100644
> --- a/bin/winvlc.c
> +++ b/bin/winvlc.c
> @@ -78,7 +78,39 @@ static BOOL SetDefaultDllDirectories_(DWORD flags)
>      return SetDefaultDllDirectoriesReal(flags);
>  }
>  # define SetDefaultDllDirectories SetDefaultDllDirectories_
> +
> +#endif
> +
> +static void PrioritizeSystem32()
> +{
> +#if _WIN32_WINNT < _WIN32_WINNT_WIN10
> +    typedef struct _PROCESS_MITIGATION_IMAGE_LOAD_POLICY {
> +      union {
> +        DWORD  Flags;
> +        struct {
> +          DWORD NoRemoteImages  :1;
> +          DWORD NoLowMandatoryLabelImages  :1;
> +          DWORD PreferSystem32Images  :1;
> +          DWORD ReservedFlags  :29;
> +        };
> +      };
> +    } PROCESS_MITIGATION_IMAGE_LOAD_POLICY;

Are these the official names ? Because they may collide when it's
added with mingw or when compiled with MS headers.

> +#if _WIN32_WINNT < _WIN32_WINNT_WIN8
> +    BOOL WINAPI (*SetProcessMitigationPolicy)(PROCESS_MITIGATION_POLICY, PVOID, SIZE_T);
> +    HINSTANCE h_Kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
> +    if ( !h_Kernel32 )
> +        return;
> +    SetProcessMitigationPolicy = (BOOL (WINAPI *)(PROCESS_MITIGATION_POLICY, PVOID, SIZE_T))
> +                                   GetProcAddress(h_Kernel32, "SetProcessMitigationPolicy");
> +    if (SetProcessMitigationPolicy == NULL)
> +        return;
> +#endif
>  #endif
> +    PROCESS_MITIGATION_IMAGE_LOAD_POLICY m;
> +    m.Flags = 0;
> +    m.PreferSystem32Images = 1;
> +    SetProcessMitigationPolicy( 10 /* ProcessImageLoadPolicy */, &m, sizeof( m ) );
> +}
>
>  int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
>                      LPSTR lpCmdLine,
> @@ -126,6 +158,10 @@ int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
>       * will search in SYSTEM32 only
>       * */
>      SetDefaultDllDirectories(LOAD_LIBRARY_SEARCH_SYSTEM32);
> +    /***
> +     * Load DLLs from system32 before any other folder (when possible)
> +     */
> +    PrioritizeSystem32();
>
>      /* Args */
>      wchar_t **wargv = CommandLineToArgvW (GetCommandLine (), &argc);
> --
> 2.11.0
>
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