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# Copyright 2017-2023 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# This file is part of the gdb testsuite.
# Test that GDB tolerates being started with libSegFault.so preloaded
# with LD_PRELOAD, and that GDB warns about a custom SIGSEGV custom
# handler. See PR gdb/18653
# <https://sourceware.org/bugzilla/show_bug.cgi?id=18653#c7>.
# We cannot expect remote hosts to see environment variables set on
# the local machine.
if { [is_remote host] } {
unsupported "can't set environment variables on remote host"
return -1
}
# Spawn GDB with LIB preloaded with LD_PRELOAD. CMDLINE_OPTS are
# command line options passed to GDB.
proc gdb_spawn_with_ld_preload {lib cmdline_opts} {
global env
save_vars { env(LD_PRELOAD) env(ASAN_OPTIONS)} {
if { ![info exists env(LD_PRELOAD) ]
|| $env(LD_PRELOAD) == "" } {
set env(LD_PRELOAD) "$lib"
} else {
append env(LD_PRELOAD) ":$lib"
}
# Prevent address sanitizer error:
# ASan runtime does not come first in initial library list; you should
# either link runtime to your application or manually preload it with
# LD_PRELOAD.
set_sanitizer_default ASAN_OPTIONS verify_asan_link_order 0
gdb_spawn_with_cmdline_opts $cmdline_opts
}
}
proc test_libsegfault {} {
global gdb_prompt
set libsegfault "libSegFault.so"
# When started normally, if libSegFault.so is preloaded, GDB
# should warn about not being able to propagate the signal
# disposition of SIGSEGV.
gdb_exit
gdb_spawn_with_ld_preload $libsegfault ""
set test "gdb emits custom handler warning"
gdb_test_multiple "" $test {
-re "cannot be preloaded.*\r\n$gdb_prompt $" {
# Glibc 2.22 outputs:
# ERROR: ld.so: object 'libSegFault.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
untested "cannot preload libSegFault.so"
return
}
-re "Found custom handler.*won't be propagated.*\r\n$gdb_prompt $" {
pass $test
}
}
# "-q" should disable the warning, though.
gdb_exit
gdb_spawn_with_ld_preload $libsegfault "-q"
set test "quiet suppresses custom handler warning"
gdb_test_multiple "" $test {
-re "^$gdb_prompt $" {
pass $test
}
}
}
test_libsegfault
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