1#!/bin/sh 2 3# Copyright (C) 2017 Red Hat, Inc. 4# 5# This program is free software; you can redistribute it and#or modify 6# it under the terms of the GNU General Public License as published by 7# the Free Software Foundation; either version 2 of the License, or 8# (at your option) any later version. 9# 10# This program is distributed in the hope that it will be useful, but 11# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 12# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13# for more details. 14# 15# You should have received a copy of the GNU General Public License 16# along with this program; if not, see <http://www.gnu.org/licenses/>. 17 18# Test description: [regression] Check if the vsyscall and vdso VMA regions are 19# reported correctly. 20# 21# While [vsyscall] is mostly deprecated with newer systems, there is 22# still plenty of kernels compiled with CONFIG_LEGACY_VSYSCALL_NATIVE and 23# CONFIG_LEGACY_VSYSCALL_EMULATE (see linux/arch/x86/Kconfig for option 24# descriptions). First part of the test will check eligible kernels for 25# regression for a bug fixed by commit 103efcd9aac1 (fix perms/range of 26# vsyscall vma in /proc/*/maps). 27# 28# Second part of test checks [vdso] VMA permissions (fixed with commits 29# b6558c4a2378 (fix [vdso] page permissions) and e5b97dde514f (Add 30# VM_ALWAYSDUMP)). As a consequence of this bug, VMAs were not included 31# in core dumps which resulted in eg. incomplete backtraces and invalid 32# core dump files created by gdb. 33 34# Usage 35# ./vma05.sh 36 37TST_SETUP=setup 38TST_CLEANUP=cleanup 39TST_TESTFUNC=vma_report_check 40TST_NEEDS_ROOT=1 41TST_NEEDS_TMPDIR=1 42TST_NEEDS_CMDS="gdb" 43 44. tst_test.sh 45 46CORE_LIMIT=$(ulimit -c) 47CORE_PATTERN=$(cat /proc/sys/kernel/core_pattern) 48 49setup() 50{ 51 ulimit -c unlimited 52 echo "core" > /proc/sys/kernel/core_pattern 53} 54 55cleanup() 56{ 57 ulimit -c "$CORE_LIMIT" 58 echo "$CORE_PATTERN" > /proc/sys/kernel/core_pattern 59} 60 61vma_report_check() 62{ 63 if [ $(uname -m) = "x86_64" ]; then 64 if LINE=$(grep "vsyscall" /proc/self/maps); then 65 RIGHT="ffffffffff600000-ffffffffff601000[[:space:]]r-xp" 66 if echo "$LINE" | grep -q "$RIGHT"; then 67 tst_res TPASS "[vsyscall] reported correctly" 68 else 69 tst_res TFAIL "[vsyscall] reporting wrong" 70 fi 71 fi 72 fi 73 74 rm -rf core* 75 { vma05_vdso; } > /dev/null 2>&1 76 TRACE=$(gdb -silent -ex="thread apply all backtrace" -ex="quit"\ 77 vma05_vdso ./core* 2> /dev/null) 78 if echo "$TRACE" | grep -qF "??"; then 79 tst_res TFAIL "[vdso] bug not patched" 80 else 81 tst_res TPASS "[vdso] backtrace complete" 82 fi 83} 84 85tst_run 86