From 2c75b545de6fe3c44138799c68217a94bc669a88 Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Tue, 18 Jun 2019 16:42:10 +0200 Subject: 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. --- elf/tst-dlopen-pie.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 elf/tst-dlopen-pie.c (limited to 'elf/tst-dlopen-pie.c') diff --git a/elf/tst-dlopen-pie.c b/elf/tst-dlopen-pie.c new file mode 100644 index 0000000000..6a41c731cb --- /dev/null +++ b/elf/tst-dlopen-pie.c @@ -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 + . */ + +/* This test attempts to open the (otherwise unrelated) PIE test + program elf/tst-pie1 and expects the attempt to fail. */ + +#include +#include +#include +#include +#include + +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 -- cgit 1.4.1