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jeremybenn |
# Copyright (C) 2010 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see .
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# Return nul-terminated string read from section SECTION of EXEC. Return ""
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# if no such section or nul-terminated string was found. Function is useful
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# for sections ".interp" or ".gnu_debuglink".
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proc section_get {exec section} {
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global objdir
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global subdir
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set tmp "${objdir}/${subdir}/section_get.tmp"
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set objcopy_program [transform objcopy]
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set command "exec $objcopy_program -O binary --set-section-flags $section=A --change-section-address $section=0 -j $section $exec $tmp"
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verbose -log "command is $command"
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set result [catch $command output]
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verbose -log "result is $result"
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verbose -log "output is $output"
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if {$result == 1} {
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return ""
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}
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set fi [open $tmp]
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fconfigure $fi -translation binary
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set data [read $fi]
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close $fi
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file delete $tmp
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# .interp has size $len + 1 but .gnu_debuglink contains garbage after \000.
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set len [string first \000 $data]
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if {$len < 0} {
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verbose -log "section $section not found"
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return ""
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}
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set retval [string range $data 0 [expr $len - 1]]
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verbose -log "section $section is <$retval>"
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return $retval
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}
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# Resolve symlinks.
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proc symlink_resolve {file} {
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set loop 0
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while {[file type $file] == "link"} {
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set target [file readlink $file]
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if {[file pathtype $target] == "relative"} {
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set src2 [file dirname $file]/$target
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} else {
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set src2 $target
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}
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verbose -log "Resolved symlink $file targetting $target as $src2"
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set file $src2
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set loop [expr $loop + 1]
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if {$loop > 30} {
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fail "Looping symlink resolution for $file"
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return ""
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}
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}
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return $file
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}
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# Copy SRC to DEST, resolving any symlinks in SRC. Return nonzero iff
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# the copy was succesful.
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#
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# This function is guaranteed to never raise any exception, even when the copy
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# fails.
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proc file_copy {src dest} {
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set src [symlink_resolve $src]
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# Test name would contain unstable directory name for symlink-unresolved
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# $src.
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set test "copy [file tail $src] to [file tail $dest]"
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set command "file copy -force -- $src $dest"
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verbose -log "command is $command"
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if [catch $command] {
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fail $test
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return 0
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} else {
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pass $test
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return 1
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}
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}
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# Wrap function build_executable so that the resulting executable is fully
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# self-sufficient (without dependencies on system libraries). Parameter
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# INTERP may be used to specify a loader (ld.so) to be used that is
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# different from the default system one. Libraries on which the executable
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# depends are copied into directory DIR. Default DIR value to
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# `${objdir}/${subdir}/${EXECUTABLE}.d'.
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#
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# In case of success, return a string containing the arguments to be used
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# in order to perform a prelink of the executable obtained. Return the
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# empty string in case of failure.
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#
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# This can be useful when trying to prelink an executable which might
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# depend on system libraries. To properly prelink an executable, all
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# of its dynamically linked libraries must be prelinked as well. If
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# the executable depends on some system libraries, we may not have
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# sufficient write priviledges on these files to perform the prelink.
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# This is why we make a copy of these shared libraries, and link the
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# executable against these copies instead.
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#
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# Function recognizes only libraries listed by `ldd' after
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# its ` => ' separator. That means $INTERP and any libraries not being linked
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# with -Wl,-soname,NAME.so are not copied.
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proc build_executable_own_libs {testname executable sources options {interp ""} {dir ""}} {
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global objdir subdir
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if {[build_executable $testname $executable $sources $options] == -1} {
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return ""
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}
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set binfile ${objdir}/${subdir}/${executable}
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set command "ldd $binfile"
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set test "ldd $executable"
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set result [catch "exec $command" output]
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verbose -log "result of $command is $result"
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verbose -log "output of $command is $output"
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if {$result != 0 || $output == ""} {
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fail $test
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} else {
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pass $test
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}
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# gdb testsuite will put there also needless -lm.
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set test "$test output contains libs"
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set libs [regexp -all -inline -line {^.* => (/[^ ]+).*$} $output]
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if {[llength $libs] == 0} {
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fail $test
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} else {
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pass $test
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}
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if {$dir == ""} {
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set dir ${binfile}.d
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}
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file delete -force -- $dir
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file mkdir $dir
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if {$interp == ""} {
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set interp_system [section_get $binfile .interp]
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set interp ${dir}/[file tail $interp_system]
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file_copy $interp_system $interp
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}
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set dests {}
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foreach {trash abspath} $libs {
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set dest "$dir/[file tail $abspath]"
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file_copy $abspath $dest
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lappend dests $dest
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}
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# Do not lappend it so that "-rpath $dir" overrides any possible "-rpath"s
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# specified by the caller to be able to link it for ldd" above.
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set options [linsert $options 0 "additional_flags=-Wl,--dynamic-linker,$interp,-rpath,$dir"]
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if {[build_executable $testname $executable $sources $options] == -1} {
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return ""
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}
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set prelink_args "--dynamic-linker=$interp --ld-library-path=$dir $binfile $interp [concat $dests]"
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return $prelink_args
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}
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# Unprelink ARG. Reported test name can be specified by NAME. Return non-zero
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# on success, zero on failure.
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proc prelink_no {arg {name {}}} {
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if {$name == ""} {
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set name [file tail $arg]
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}
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set test "unprelink $name"
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set command "exec /usr/sbin/prelink -uN $arg"
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verbose -log "command is $command"
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set result [catch $command output]
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verbose -log "result is $result"
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verbose -log "output is $output"
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if {$result == 1 && [regexp {^(couldn't execute "/usr/sbin/prelink[^\r\n]*": no such file or directory\n?)*$} $output]} {
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# Without prelink, at least verify that all the binaries do not
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# contain the ".gnu.prelink_undo" section (which would mean that they
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# have already been prelinked).
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set test "$test (missing /usr/sbin/prelink)"
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foreach bin [split $arg] {
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if [string match "-*" $bin] {
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# Skip prelink options.
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continue
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}
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set readelf_program [transform readelf]
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set command "exec $readelf_program -WS $bin"
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verbose -log "command is $command"
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set result [catch $command output]
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verbose -log "result is $result"
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verbose -log "output is $output"
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if {$result != 0 || [string match {* .gnu.prelink_undo *} $output]} {
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fail "$test ($bin is already prelinked)"
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return 0
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}
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}
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pass $test
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return 1
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}
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if {$result == 0 && $output == ""} {
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verbose -log "$name has been now unprelinked"
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set command "exec /usr/sbin/prelink -uN $arg"
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verbose -log "command is $command"
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set result [catch $command output]
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verbose -log "result is $result"
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verbose -log "output is $output"
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}
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# Last line does miss the trailing \n. There can be multiple such messages
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# as ARG may list multiple files.
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if {$result == 1 && [regexp {^(/usr/sbin/prelink[^\r\n]*: [^ ]* does not have .gnu.prelink_undo section\n?)*$} $output]} {
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pass $test
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return 1
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} else {
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fail $test
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return 0
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}
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}
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# Prelink ARG. Reported test name can be specified by NAME. Return non-zero
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# on success, zero on failure.
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proc prelink_yes {arg {name ""}} {
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if {$name == ""} {
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set name [file tail $arg]
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}
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# Try to unprelink it first so that, if it has been already prelinked
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# before, we get a different address now, making the new result unaffected
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# by any previous prelinking.
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if ![prelink_no $arg "$name pre-unprelink"] {
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return 0
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}
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set test "prelink $name"
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# `--no-exec-shield' is for i386, where prelink in the exec-shield mode is
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# forced to push all the libraries tight together, in order to fit into
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# the first two memory areas (either the ASCII Shield area or at least
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# below the executable). If the prelink was performed in exec-shield
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# mode, prelink could have no choice on how to randomize the single new
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# unprelinked library address without wasting space in the first one/two
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# memory areas. In such case prelink could place $ARG repeatedly at the
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# same place and we could have false prelink results on
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# gdb.base/prelink.exp and others. To prevent this from happening, we use
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# the --no-exec-shield switch. This may have some consequences in terms
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# of security, but we do not care in our case.
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set command "exec /usr/sbin/prelink -qNR --no-exec-shield $arg"
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verbose -log "command is $command"
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set result [catch $command output]
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verbose -log "result is $result"
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verbose -log "output is $output"
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if {$result == 1 && [regexp {^(couldn't execute "/usr/sbin/prelink[^\r\n]*": no such file or directory\n?)*$} $output]} {
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set test "$test (missing /usr/sbin/prelink)"
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# We could not find prelink. We could check whether $args is already
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# prelinked but we don't, because:
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# - It is unlikely that someone uninstalls prelink after having
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# prelinked the system ld.so;
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# - We still cannot change its prelinked address.
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# Therefore, we just skip the test.
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xfail $test
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return 0
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}
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if {$result == 0 && $output == ""} {
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pass $test
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return 1
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} elseif {$result == 1 \
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&& [string match -nocase "*: Not enough room to add .dynamic entry" $output]} {
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# Linker should have reserved some entries for prelink.
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xfail $test
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return 0
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} else {
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fail $test
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return 0
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}
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}
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