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Fixed bug 4308 - Prebuilt SDL.dll files not compiled with ASLR support (DYNAMICBASE)

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Cameron Gutman

The current SDL 2.0.8 and the prerelease SDL 2.0.9 are compiled without the DYNAMICBASE flag to indicate that ASLR may relocate the DLL at load-time. https://docs.microsoft.com/en-us/cpp/build/reference/dynamicbase-use-address-space-layout-randomization?view=vs-2017

When I build SDL.dll myself using the VS2010 project, the DLL has the DYNAMICBASE flag set (as is the default). Similarly, MinGW-w64 also enables ASLR by default on all binaries for a couple years now (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=836365)
This commit is contained in:
Sam Lantinga 2018-11-02 18:07:11 -07:00
parent cc39c7a0cb
commit 4026f89d19
2 changed files with 153 additions and 0 deletions
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102
configure vendored
View file

@ -16063,6 +16063,108 @@ esac
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_no_undefined" >&5
$as_echo "$have_no_undefined" >&6; }
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker option --dynamicbase" >&5
$as_echo_n "checking for linker option --dynamicbase... " >&6; }
have_dynamicbase=no
case "$host" in
*)
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,--dynamicbase"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
have_dynamicbase=yes
EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--dynamicbase"
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
LDFLAGS="$save_LDFLAGS"
;;
esac
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_dynamicbase" >&5
$as_echo "$have_dynamicbase" >&6; }
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker option --nxcompat" >&5
$as_echo_n "checking for linker option --nxcompat... " >&6; }
have_nxcompat=no
case "$host" in
*)
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,--nxcompat"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
have_nxcompat=yes
EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--nxcompat"
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
LDFLAGS="$save_LDFLAGS"
;;
esac
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_nxcompat" >&5
$as_echo "$have_nxcompat" >&6; }
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker option --high-entropy-va" >&5
$as_echo_n "checking for linker option --high-entropy-va... " >&6; }
have_high_entropy_va=no
case "$host" in
*)
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,--high-entropy-va"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
have_high_entropy_va=yes
EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--high-entropy-va"
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
LDFLAGS="$save_LDFLAGS"
;;
esac
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_high_entropy_va" >&5
$as_echo "$have_high_entropy_va" >&6; }
# Check whether --enable-libc was given.
if test "${enable_libc+set}" = set; then :
enableval=$enable_libc;

51
configure.in
View file

@ -232,6 +232,57 @@ case "$host" in
esac
AC_MSG_RESULT($have_no_undefined)
AC_MSG_CHECKING(for linker option --dynamicbase)
have_dynamicbase=no
case "$host" in
*)
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,--dynamicbase"
AC_TRY_LINK([
],[
],[
have_dynamicbase=yes
EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--dynamicbase"
])
LDFLAGS="$save_LDFLAGS"
;;
esac
AC_MSG_RESULT($have_dynamicbase)
AC_MSG_CHECKING(for linker option --nxcompat)
have_nxcompat=no
case "$host" in
*)
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,--nxcompat"
AC_TRY_LINK([
],[
],[
have_nxcompat=yes
EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--nxcompat"
])
LDFLAGS="$save_LDFLAGS"
;;
esac
AC_MSG_RESULT($have_nxcompat)
AC_MSG_CHECKING(for linker option --high-entropy-va)
have_high_entropy_va=no
case "$host" in
*)
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,--high-entropy-va"
AC_TRY_LINK([
],[
],[
have_high_entropy_va=yes
EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--high-entropy-va"
])
LDFLAGS="$save_LDFLAGS"
;;
esac
AC_MSG_RESULT($have_high_entropy_va)
dnl See whether we are allowed to use the system C library
AC_ARG_ENABLE(libc,
AC_HELP_STRING([--enable-libc], [Use the system C library [[default=yes]]]),