[FFmpeg-devel] [PATCH] lavf/os_support: Add safe win32 dlopen/dlclose/dlsym functions.

Michael Niedermayer michael at niedermayer.cc
Sun Aug 28 12:58:26 EEST 2016


On Sun, Aug 28, 2016 at 06:50:58PM +1000, Matt Oliver wrote:
> The dlopen function is modified to prevent loading dll's from the current
> directory for improved program security for library users. This extends
> similar functionality from the recently applied  SetDllDirectory patch
> except that it adds additional security for library users as well (as
> opposed to just program users).

>  os_support.h |   49 +++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
> 89c775ecc8ac03d001131dd50e043ba57ffe5420  0001-lavf-os_support-Add-safe-win32-dlopen-dlclose-dlsym-.patch
> From 666ab2f7d64cfa94984881aca830355555993365 Mon Sep 17 00:00:00 2001
> From: Matt Oliver <protogonoi at gmail.com>
> Date: Sun, 21 Aug 2016 16:06:59 +1000
> Subject: [PATCH 1/2] lavf/os_support: Add safe win32 dlopen/dlclose/dlsym
>  functions.

breaks mingw32

In file included from src/libavformat/internal.h:28:0,
                 from src/libavdevice/lavfi.c:44:
src/libavformat/os_support.h: In function ‘win32_dlopen’:
src/libavformat/os_support.h:303:46: error: ‘LOAD_LIBRARY_SEARCH_APPLICATION_DIR’ undeclared (first use in this function)
src/libavformat/os_support.h:303:46: note: each undeclared identifier is reported only once for each function it appears in
src/libavformat/os_support.h:303:84: error: ‘LOAD_LIBRARY_SEARCH_SYSTEM32’ undeclared (first use in this function)
In file included from src/libavformat/internal.h:28:0,
                 from src/libavdevice/gdigrab.c:32:
src/libavformat/os_support.h: In function ‘win32_dlopen’:
src/libavformat/os_support.h:303:46: error: ‘LOAD_LIBRARY_SEARCH_APPLICATION_DIR’ undeclared (first use in this function)
src/libavformat/os_support.h:303:46: note: each undeclared identifier is reported only once for each function it appears in
src/libavformat/os_support.h:303:84: error: ‘LOAD_LIBRARY_SEARCH_SYSTEM32’ undeclared (first use in this function)
make: *** [libavdevice/lavfi.o] Error 1


[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The worst form of inequality is to try to make unequal things equal.
-- Aristotle
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