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| 1 | +# Copyright 2017-2018 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 |
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