1# Copyright 2017-2020 Free Software Foundation, Inc.
2
3# This program is free software; you can redistribute it and/or modify
4# it under the terms of the GNU General Public License as published by
5# the Free Software Foundation; either version 3 of the License, or
6# (at your option) any later version.
7#
8# This program is distributed in the hope that it will be useful,
9# but WITHOUT ANY WARRANTY; without even the implied warranty of
10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11# GNU General Public License for more details.
12#
13# You should have received a copy of the GNU General Public License
14# along with this program.  If not, see <http://www.gnu.org/licenses/>.
15
16# This file is part of the gdb testsuite.
17
18# Test that GDB tolerates being started with libSegFault.so preloaded
19# with LD_PRELOAD, and that GDB warns about a custom SIGSEGV custom
20# handler.  See PR gdb/18653
21# <https://sourceware.org/bugzilla/show_bug.cgi?id=18653#c7>.
22
23# We cannot expect remote hosts to see environment variables set on
24# the local machine.
25if { [is_remote host] } {
26    unsupported "can't set environment variables on remote host"
27    return -1
28}
29
30# Spawn GDB with LIB preloaded with LD_PRELOAD.  CMDLINE_OPTS are
31# command line options passed to GDB.
32
33proc gdb_spawn_with_ld_preload {lib cmdline_opts} {
34    global env
35
36    save_vars { env(LD_PRELOAD) } {
37	if { ![info exists env(LD_PRELOAD) ]
38	     || $env(LD_PRELOAD) == "" } {
39	    set env(LD_PRELOAD) "$lib"
40	} else {
41	    append env(LD_PRELOAD) ":$lib"
42	}
43
44	gdb_spawn_with_cmdline_opts $cmdline_opts
45    }
46}
47
48proc test_libsegfault {} {
49    global gdb_prompt
50
51    set libsegfault "libSegFault.so"
52
53    # When started normally, if libSegFault.so is preloaded, GDB
54    # should warn about not being able to propagate the signal
55    # disposition of SIGSEGV.
56    gdb_exit
57    gdb_spawn_with_ld_preload $libsegfault ""
58
59    set test "gdb emits custom handler warning"
60    gdb_test_multiple "" $test {
61	-re "cannot be preloaded.*\r\n$gdb_prompt $" {
62	    # Glibc 2.22 outputs:
63	    # ERROR: ld.so: object 'libSegFault.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
64	    untested "cannot preload libSegFault.so"
65	    return
66	}
67	-re "Found custom handler.*won't be propagated.*\r\n$gdb_prompt $" {
68	    pass $test
69	}
70    }
71
72    # "-q" should disable the warning, though.
73    gdb_exit
74    gdb_spawn_with_ld_preload $libsegfault "-q"
75
76    set test "quiet suppresses custom handler warning"
77    gdb_test_multiple "" $test {
78	-re "^$gdb_prompt $" {
79	    pass $test
80	}
81    }
82}
83
84test_libsegfault
85