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4a94e368 1# Copyright 2017-2022 Free Software Foundation, Inc.
e379cee6
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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