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The procedure to find an unused port for the debuginfod tests is susceptible to a TOCTOU failure. Change port finding in order to avoid this. Also use 'expect' to interact with the server process since we now use the server's output to determine whether a port is in use. 

* binutils/testsuite/binutils-all/debuginfod.exp: Improve port
	selection.
This commit is contained in:
Aaron Merey 2020-03-02 12:46:47 +00:00 committed by Nick Clifton
parent 728d32c496
commit b312fea191
2 changed files with 32 additions and 29 deletions
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5
binutils/ChangeLog
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@ -1,3 +1,8 @@
2020-03-02 Aaron Merey <amerey@redhat.com>
* binutils/testsuite/binutils-all/debuginfod.exp: Improve port
selection.
2020-03-02 Nick Clifton <nickc@redhat.com>
PR 25543

56
binutils/testsuite/binutils-all/debuginfod.exp
View File

@ -1,4 +1,4 @@
# Copyright (C) 2002-2019 Free Software Foundation, Inc.
# Copyright (C) 2002-2020 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
@ -72,9 +72,6 @@ if { ![binutils_assemble $srcdir/$subdir/linkdebug.s tmpdir/linkdebug.debug] } {
fail "$test (assemble linkdebug)"
}
# Find an unused port
set port [exec sh -c "while true; do PORT=`expr '(' \$RANDOM % 1000 ')' + 9000`; ss -atn | fgrep \":\$PORT\" || break; done; echo \$PORT"]
set cache [file join [pwd] "tmpdir/.debuginfod_cache"]
set db [file join [pwd] "tmpdir/.debuginfod.db"]
@ -99,34 +96,36 @@ file delete -force $db
set conf_objdump [binutils_run $OBJDUMP "-WK tmpdir/testprog"]
set conf_readelf [binutils_run $READELF "-wK tmpdir/testprog"]
set debuginfod_pid 0
# Kill the server if we abort early
proc sigint_handler {} {
global debuginfod_pid
if { $debuginfod_pid != 0 } {
catch {exec kill -INT $debuginfod_pid}
}
exit
}
trap sigint_handler INT
# Start a debuginfod server.
set debuginfod_pid [exec debuginfod -d $db -p $port -F tmpdir/dbg 2>/dev/null &]
if { !$debuginfod_pid } {
fail "$test (server init)"
# Find an unused port
set port 7999
set found 0
while { ! $found } {
incr port
if { $port == 65536 } {
untested "$test (no available ports)"
return
}
spawn debuginfod -vvvv -d $db -p $port -F tmpdir/dbg
expect {
"started http server on IPv4 IPv6 port=$port" {
set found 1
}
"Failed to bind to port" {
exec kill -INT -[exp_pid]
catch {close}; catch {wait -i $spawn_id}
}
timeout {
fail "$test (find port timeout)"
return
}
}
}
set metrics [list "ready 1" \
"thread_work_total{role=\"traverse\"} 1" \
"thread_work_pending{role=\"scan\"} 0" \
"thread_busy{role=\"scan\"} 0" \
"groom{statistic=\"buildids\"} 2"]
"thread_busy{role=\"scan\"} 0"]
# Check server metrics to confirm init has completed.
foreach m $metrics {
@ -145,7 +144,8 @@ foreach m $metrics {
if { $timelim == 0 } {
fail "$test (server init timeout)"
catch {exec kill -INT $debuginfod_pid}
exec kill -INT -[exp_pid]
catch {close}; catch {wait -i $spawn_id}
return
}
}
@ -196,5 +196,3 @@ if { [regexp ".*DEBUGINFOD.*" $conf_readelf] } {
} else {
untested "$test (readelf not configured with debuginfod)"
}
catch {exec kill -INT $debuginfod_pid}