gdb/testsuite/gdb.base/attach-pie-misread.exp

   1 # Copyright 2010-2012 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 test only works on GNU/Linux.
  17 if { ![isnative] || [is_remote host] || [target_info exists use_gdb_stub]
  18      || ![istarget *-linux*] || [skip_shlib_tests]} {
  19     continue
  20 }
  21
  22 load_lib prelink-support.exp
  23
  24 set test "attach-pie-misread"
  25 set srcfile ${test}.c
  26 set genfile ${objdir}/${subdir}/${test}-gen.h
  27 set executable ${test}
  28 set binfile ${objdir}/${subdir}/${executable}
  29
  30 if {[build_executable_own_libs ${test}.exp $executable $srcfile [list additional_flags=-fPIE ldflags=-pie]] == ""} {
  31     return -1
  32 }
  33
  34 # Program Headers:
  35 #   Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz   Flg Align
  36 #   LOAD           0x000000 0x0000000000400000 0x0000000000400000 0x134f5ec 0x134f5ec R E 0x200000
  37 #   LOAD           0x134f5f0 0x000000000194f5f0 0x000000000194f5f0 0x1dbc60 0x214088 RW  0x200000
  38 #   DYNAMIC        0x134f618 0x000000000194f618 0x000000000194f618 0x000200 0x000200 RW  0x8
  39 #
  40 proc read_phdr {binfile test} {
  41     set readelf_program [transform readelf]
  42     set command "exec $readelf_program -Wl $binfile"
  43     verbose -log "command is $command"
  44     set result [catch $command output]
  45     verbose -log "result is $result"
  46     verbose -log "output is $output"
  47     if {$result != 0} {
  48         fail $test
  49         return
  50     }
  51     if ![regexp {\nProgram Headers:\n *Type [^\n]* Align\n(.*?)\n\n} $output trash phdr] {
  52         fail "$test (no Program Headers)"
  53         return
  54     }
  55     if ![regexp -line {^ *DYNAMIC +0x[0-9a-f]+ +(0x[0-9a-f]+) } $phdr trash dynamic_vaddr] {
  56         fail "$test (no DYNAMIC found)"
  57         return
  58     }
  59     verbose -log "dynamic_vaddr is $dynamic_vaddr"
  60     set align_max -1
  61     foreach {trash align} [regexp -line -all -inline {^ *LOAD .* (0x[0-9]+)$} $phdr] {
  62         if {$align_max < $align} {
  63             set align_max $align
  64         }
  65     }
  66     verbose -log "align_max is $align_max"
  67     if {$align_max == -1} {
  68         fail "$test (no LOAD found)"
  69         return
  70     }
  71     pass $test
  72     return [list $dynamic_vaddr $align_max]
  73 }
  74
  75 set phdr [read_phdr $binfile "readelf initial scan"]
  76 set dynamic_vaddr [lindex $phdr 0]
  77 set align_max [lindex $phdr 1]
  78
  79 set stub_size [format 0x%x [expr "2 * $align_max - ($dynamic_vaddr & ($align_max - 1))"]]
  80 verbose -log "stub_size is $stub_size"
  81
  82 # On x86_64 it is commonly about 4MB.
  83 if {$stub_size > 25000000} {
  84     xfail "stub size $stub_size is too large"
  85     return
  86 }
  87
  88 set test "generate stub"
  89 set command "exec $binfile $stub_size >$genfile"
  90 verbose -log "command is $command"
  91 set result [catch $command output]
  92 verbose -log "result is $result"
  93 verbose -log "output is $output"
  94 if {$result == 0} {
  95     pass $test
  96 } else {
  97     fail $test
  98 }
  99
 100 set prelink_args [build_executable_own_libs ${test}.exp $executable $srcfile [list "additional_flags=-fPIE -DGEN=\"$genfile\"" "ldflags=-pie"]]
 101 if {$prelink_args == ""} {
 102     return -1
 103 }
 104
 105 # x86_64 file has 25MB, no need to keep it.
 106 file delete -- $genfile
 107
 108 set phdr [read_phdr $binfile "readelf rebuilt with stub_size"]
 109 set dynamic_vaddr_prelinkno [lindex $phdr 0]
 110
 111 if ![prelink_yes $prelink_args] {
 112     return -1
 113 }
 114
 115 set phdr [read_phdr $binfile "readelf with prelink -R"]
 116 set dynamic_vaddr_prelinkyes [lindex $phdr 0]
 117
 118 set first_offset [format 0x%x [expr $dynamic_vaddr_prelinkyes - $dynamic_vaddr_prelinkno]]
 119 verbose -log "first_offset is $first_offset"
 120
 121 set test "first offset is non-zero"
 122 if {$first_offset == 0} {
 123     fail "$test (-fPIE -pie in effect?)"
 124 } else {
 125     pass $test
 126 }
 127
 128 set test "start inferior"
 129 gdb_exit
 130
 131 set res [remote_spawn host $binfile];
 132 if { $res < 0 || $res == "" } {
 133     perror "Spawning $binfile failed."
 134     fail $test
 135     return
 136 }
 137 set pid [exp_pid -i $res]
 138 gdb_expect {
 139     -re "sleeping\r\n" {
 140         pass $test
 141     }
 142     eof {
 143         fail "$test (eof)"
 144         remote_exec host "kill -9 $pid"
 145         return
 146     }
 147     timeout {
 148         fail "$test (timeout)"
 149         remote_exec host "kill -9 $pid"
 150         return
 151     }
 152 }
 153
 154 # Due to alignments it was reproducible with 1 on x86_64 but 2 on i686.
 155 foreach align_mult {1 2} { with_test_prefix " shift-by-$align_mult:" {
 156
 157     # FIXME: We believe there is enough room under FIRST_OFFSET.
 158     set shifted_offset [format 0x%x [expr "$first_offset - $align_mult * $align_max"]]
 159     verbose -log "shifted_offset is $shifted_offset"
 160
 161     # For normal prelink (prelink_yes call), we need to supply $prelink_args.
 162     # For the prelink `-r' option below, $prelink_args is not required.
 163     # Moreover, if it was used, the problem would not longer be reproducible
 164     # as the libraries would also get relocated.
 165     set command "exec /usr/sbin/prelink -q -N --no-exec-shield -r $shifted_offset $binfile"
 166     verbose -log "command is $command"
 167     set result [catch $command output]
 168     verbose -log "result is $result"
 169     verbose -log "output is $output"
 170
 171     set test "prelink -r"
 172     if {$result == 0 && $output == ""} {
 173         pass $test
 174     } else {
 175         fail $test
 176     }
 177
 178     clean_restart $executable
 179
 180     set test "attach"
 181     gdb_test_multiple "attach $pid" $test {
 182         -re "Attaching to program: .*, process $pid\r\n" {
 183             # Missing "$gdb_prompt $" is intentional.
 184             pass $test
 185         }
 186     }
 187
 188     set test "error on Cannot access memory at address"
 189     gdb_test_multiple "" $test {
 190         -re "\r\nCannot access memory at address .*$gdb_prompt $" {
 191             fail $test
 192         }
 193         -re "$gdb_prompt $" {
 194             pass $test
 195         }
 196     }
 197
 198     gdb_test "detach" "Detaching from program: .*"
 199 }}
 200
 201 remote_exec host "kill -9 $pid"