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authorRoland McGrath <roland@gnu.org>2003-09-23 12:07:26 +0000
committerRoland McGrath <roland@gnu.org>2003-09-23 12:07:26 +0000
commit2abf9ff11384a47dc456c138a8faf6b1469aac2b (patch)
treed0ccba6b9bf3096c8d1d2d209984bf4d28597408 /configure.in
parentecdeaac05f73c29eca92eecd55ad4fb8513c7771 (diff)
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* sysdeps/i386/dl-machine.h (RTLD_START): Set __libc_stack_end before
calling _dl_start, using GOTOFF access. * configure.in (libc_cv_z_execstack): New check. * configure: Regenerated. * config.make.in (have-z-execstack): New variable set by it. * elf/tst-execstack.c: New file. * elf/tst-execstack-mod.c: New file. * elf/tst-execstack-needed.c: New file. * elf/Makefile (tests-execstack-yes, modules-execstack-yes): New variables. (tests, modules-names): Conditionally include them. (distribute): Add tst-execstack-mod.c here. ($(objpfx)tst-execstack, $(objpfx)tst-execstack.out): New targets. (LDFLAGS-tst-execstack, LDFLAGS-tst-execstack-mod): New variables. ($(objpfx)tst-execstack-needed): New target. (LDFLAGS-tst-execstack-needed): New variable. * sysdeps/generic/ldsodefs.h (struct rtld_global): Add _dl_stack_flags and _dl_make_stack_executable_hook. Declare _dl_make_stack_executable. * elf/rtld.c (_rtld_global): Add initializer for _dl_stack_flags. (dl_main): Reset _dl_stack_flags according to PT_GNU_STACK phdr. Initialize _dl_make_stack_executable_hook. * elf/dl-support.c: Define those new variables. (_dl_non_dynamic_init): Scan phdrs for PT_GNU_STACK. (_dl_phdr): Fix type. * elf/dl-load.c (_dl_map_object_from_fd): Grok PT_GNU_STACK phdr and enable execute permission for the stack if necessary. * sysdeps/generic/dl-execstack.c: New file. * elf/Makefile (dl-routines): Add it. * elf/Versions (ld: GLIBC_PRIVATE): Add _dl_make_stack_executable. * sysdeps/unix/sysv/linux/dl-execstack.c: New file.
Diffstat (limited to 'configure.in')
-rw-r--r--configure.in20
1 files changed, 19 insertions, 1 deletions
diff --git a/configure.in b/configure.in
index 91d903f591..c3f4adb89d 100644
--- a/configure.in
+++ b/configure.in
@@ -1334,6 +1334,7 @@ EOF
ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
fi
AC_SUBST(ASFLAGS_config)
+
AC_CACHE_CHECK(for -z combreloc,
libc_cv_z_combreloc, [dnl
cat > conftest.c <<EOF
@@ -1363,8 +1364,25 @@ dnl look for a section named .rel.dyn.
if test "$libc_cv_z_combreloc" = yes; then
AC_DEFINE(HAVE_Z_COMBRELOC)
fi
+ AC_SUBST(libc_cv_z_combreloc)
+
+ AC_CACHE_CHECK(for -z execstack,
+ libc_cv_z_execstack, [dnl
+ cat > conftest.c <<EOF
+int _start (void) { return 42; }
+EOF
+ if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+ -shared -o conftest.so conftest.c
+ -Wl,-z,execstack -nostdlib
+ 1>&AS_MESSAGE_LOG_FD])
+ then
+ libc_cv_z_execstack=yes
+ else
+ libc_cv_z_execstack=no
+ fi
+ rm -f conftest*])
+ AC_SUBST(libc_cv_z_execstack)
fi
-AC_SUBST(libc_cv_z_combreloc)
if test $elf != yes; then
AC_CACHE_CHECK(for .init and .fini sections, libc_cv_have_initfini,