mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-21 20:40:05 +00:00
elf: Refuse to dlopen PIE objects [BZ #24323]
Another executable has already been mapped, so the dynamic linker cannot perform relocations correctly for the second executable.
This commit is contained in:
Florian Weimer
parent
02d8b5ab1c
commit
2c75b545de
12
ChangeLog
12
ChangeLog
@ -1,3 +1,15 @@
|
||||
2019-06-18 Florian Weimer <fweimer@redhat.com>
|
||||
|
||||
[BZ #24323]
|
||||
* include/elf.h (DT_1_SUPPORTED_MASK): Include DF_1_PIE.
|
||||
* elf/dl-load.c (_dl_map_object_from_fd): Check for DF_1_PIE and
|
||||
fail when called from dlopen.
|
||||
* elf/Makefile [have-fpie && build-shared] (tests): Add
|
||||
tst-dlopen-pie.
|
||||
(tst-dlopen-pie): Link with -ldl.
|
||||
(tst-dlopen-pie.out): Add run-time dependency on tst-pie1.
|
||||
* elf/tst-dlopen-pie.c (do_test): New file.
|
||||
|
||||
2019-06-17 Rafal Luzynski <digitalfreak@lingonborough.com>
|
||||
|
||||
[BZ #24614]
|
||||
|
||||
@ -310,7 +310,7 @@ test-xfail-tst-protected1b = yes
|
||||
endif
|
||||
ifeq (yesyes,$(have-fpie)$(build-shared))
|
||||
modules-names += tst-piemod1
|
||||
tests += tst-pie1 tst-pie2
|
||||
tests += tst-pie1 tst-pie2 tst-dlopen-pie
|
||||
tests-pie += tst-pie1 tst-pie2
|
||||
ifeq (yes,$(have-protected-data))
|
||||
tests += vismain
|
||||
@ -1084,6 +1084,8 @@ CFLAGS-tst-pie2.c += $(pie-ccflag)
|
||||
|
||||
$(objpfx)tst-piemod1.so: $(libsupport)
|
||||
$(objpfx)tst-pie1: $(objpfx)tst-piemod1.so
|
||||
$(objpfx)tst-dlopen-pie: $(libdl)
|
||||
$(objpfx)tst-dlopen-pie.out: $(objpfx)tst-pie1
|
||||
|
||||
ifeq (yes,$(build-shared))
|
||||
# NB: Please keep cet-built-dso in sysdeps/x86/Makefile in sync with
|
||||
|
||||
@ -1158,6 +1158,10 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
|
||||
goto call_lose;
|
||||
}
|
||||
|
||||
/* dlopen of an executable is not valid because it is not possible
|
||||
to perform proper relocations, handle static TLS, or run the
|
||||
ELF constructors. For PIE, the check needs the dynamic
|
||||
section, so there is another check below. */
|
||||
if (__glibc_unlikely (type != ET_DYN)
|
||||
&& __glibc_unlikely ((mode & __RTLD_OPENEXEC) == 0))
|
||||
{
|
||||
@ -1194,9 +1198,11 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
|
||||
elf_get_dynamic_info (l, NULL);
|
||||
|
||||
/* Make sure we are not dlopen'ing an object that has the
|
||||
DF_1_NOOPEN flag set. */
|
||||
if (__glibc_unlikely (l->l_flags_1 & DF_1_NOOPEN)
|
||||
&& (mode & __RTLD_DLOPEN))
|
||||
DF_1_NOOPEN flag set, or a PIE object. */
|
||||
if ((__glibc_unlikely (l->l_flags_1 & DF_1_NOOPEN)
|
||||
&& (mode & __RTLD_DLOPEN))
|
||||
|| (__glibc_unlikely (l->l_flags_1 & DF_1_PIE)
|
||||
&& __glibc_unlikely ((mode & __RTLD_OPENEXEC) == 0)))
|
||||
{
|
||||
/* We are not supposed to load this object. Free all resources. */
|
||||
_dl_unmap_segments (l);
|
||||
@ -1207,7 +1213,11 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
|
||||
if (l->l_phdr_allocated)
|
||||
free ((void *) l->l_phdr);
|
||||
|
||||
errstring = N_("shared object cannot be dlopen()ed");
|
||||
if (l->l_flags_1 & DF_1_PIE)
|
||||
errstring
|
||||
= N_("cannot dynamically load position-independent executable");
|
||||
else
|
||||
errstring = N_("shared object cannot be dlopen()ed");
|
||||
goto call_lose;
|
||||
}
|
||||
|
||||
|
||||
49
elf/tst-dlopen-pie.c
Normal file
49
elf/tst-dlopen-pie.c
Normal file
@ -0,0 +1,49 @@
|
||||
/* dlopen test for PIE objects.
|
||||
Copyright (C) 2019 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
/* This test attempts to open the (otherwise unrelated) PIE test
|
||||
program elf/tst-pie1 and expects the attempt to fail. */
|
||||
|
||||
#include <dlfcn.h>
|
||||
#include <stddef.h>
|
||||
#include <string.h>
|
||||
#include <support/check.h>
|
||||
#include <support/support.h>
|
||||
|
||||
static void
|
||||
test_mode (int mode)
|
||||
{
|
||||
char *pie_path = xasprintf ("%s/elf/tst-pie1", support_objdir_root);
|
||||
if (dlopen (pie_path, mode) != NULL)
|
||||
FAIL_EXIT1 ("dlopen succeeded unexpectedly (%d)", mode);
|
||||
const char *message = dlerror ();
|
||||
const char *expected
|
||||
= "cannot dynamically load position-independent executable";
|
||||
if (strstr (message, expected) == NULL)
|
||||
FAIL_EXIT1 ("unexpected error message (mode %d): %s", mode, message);
|
||||
}
|
||||
|
||||
static int
|
||||
do_test (void)
|
||||
{
|
||||
test_mode (RTLD_LAZY);
|
||||
test_mode (RTLD_NOW);
|
||||
return 0;
|
||||
}
|
||||
|
||||
#include <support/test-driver.c>
|
||||
@ -23,7 +23,7 @@
|
||||
# endif
|
||||
# define DT_1_SUPPORTED_MASK \
|
||||
(DF_1_NOW | DF_1_NODELETE | DF_1_INITFIRST | DF_1_NOOPEN \
|
||||
| DF_1_ORIGIN | DF_1_NODEFLIB)
|
||||
| DF_1_ORIGIN | DF_1_NODEFLIB | DF_1_PIE)
|
||||
|
||||
#endif /* !_ISOMAC */
|
||||
#endif /* elf.h */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user