| 1 | # Copyright 2017-2019 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. |
| 25 | if { [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 | |
| 33 | proc 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 | |
| 48 | proc 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 | |
| 84 | test_libsegfault |