1# Copyright 2017-2024 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. 25require {!is_remote host} 26 27# Spawn GDB with LIB preloaded with LD_PRELOAD. CMDLINE_OPTS are 28# command line options passed to GDB. 29 30proc gdb_spawn_with_ld_preload {lib cmdline_opts} { 31 global env 32 33 save_vars { env(LD_PRELOAD) env(ASAN_OPTIONS)} { 34 if { ![info exists env(LD_PRELOAD) ] 35 || $env(LD_PRELOAD) == "" } { 36 set env(LD_PRELOAD) "$lib" 37 } else { 38 append env(LD_PRELOAD) ":$lib" 39 } 40 41 # Prevent address sanitizer error: 42 # ASan runtime does not come first in initial library list; you should 43 # either link runtime to your application or manually preload it with 44 # LD_PRELOAD. 45 set_sanitizer_default ASAN_OPTIONS verify_asan_link_order 0 46 47 gdb_spawn_with_cmdline_opts $cmdline_opts 48 } 49} 50 51proc test_libsegfault {} { 52 global gdb_prompt 53 54 set libsegfault "libSegFault.so" 55 56 # When started normally, if libSegFault.so is preloaded, GDB 57 # should warn about not being able to propagate the signal 58 # disposition of SIGSEGV. 59 gdb_exit 60 gdb_spawn_with_ld_preload $libsegfault "" 61 62 set test "gdb emits custom handler warning" 63 gdb_test_multiple "" $test { 64 -re "cannot be preloaded.*\r\n$gdb_prompt $" { 65 # Glibc 2.22 outputs: 66 # ERROR: ld.so: object 'libSegFault.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored. 67 untested "cannot preload libSegFault.so" 68 return 69 } 70 -re "Found custom handler.*won't be propagated.*\r\n$gdb_prompt $" { 71 pass $test 72 } 73 } 74 75 # "-q" should disable the warning, though. 76 gdb_exit 77 gdb_spawn_with_ld_preload $libsegfault "-q" 78 79 set test "quiet suppresses custom handler warning" 80 gdb_test_multiple "" $test { 81 -re "^$gdb_prompt $" { 82 pass $test 83 } 84 } 85} 86 87save_vars { ::INTERNAL_GDBFLAGS } { 88 set ::INTERNAL_GDBFLAGS [string map {"-q" ""} $::INTERNAL_GDBFLAGS] 89 test_libsegfault 90} 91