gdb/testsuite/gdb.base/libsegfault.exp

   1 # Copyright 2017-2022 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