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powerpc/boot: Request no dynamic linker for boot wrapper 

The boot wrapper performs its own relocations and does not require
PT_INTERP segment. However currently we don't tell the linker that.

Prior to binutils 2.28 that works OK. But since binutils commit
1a9ccd70f9a7 ("Fix the linker so that it will not silently generate ELF
binaries with invalid program headers. Fix readelf to report such
invalid binaries.") binutils tries to create a program header segment
due to PT_INTERP, and the link fails because there is no space for it:

  ld: arch/powerpc/boot/zImage.pseries: Not enough room for program headers, try linking with -N
  ld: final link failed: Bad value

So tell the linker not to do that, by passing --no-dynamic-linker.

Cc: stable@vger.kernel.org
Reported-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Drop dependency on ld-version.sh and massage change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2016-11-28 12:42:26 +11:00 committed by Michael Ellerman
parent c02e0349d7
commit ff45000fcb
1 changed files with 23 additions and 1 deletions
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24
arch/powerpc/boot/wrapper
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@ -181,6 +181,28 @@ case "$elfformat" in
elf32-powerpc) format=elf32ppc ;;
esac
ld_version()
{
# Poached from scripts/ld-version.sh, but we don't want to call that because
# this script (wrapper) is distributed separately from the kernel source.
# Extract linker version number from stdin and turn into single number.
awk '{
gsub(".*\\)", "");
gsub(".*version ", "");
gsub("-.*", "");
split($1,a, ".");
print a[1]*100000000 + a[2]*1000000 + a[3]*10000;
exit
}'
}
# Do not include PT_INTERP segment when linking pie. Non-pie linking
# just ignores this option.
LD_VERSION=$(${CROSS}ld --version | ld_version)
LD_NO_DL_MIN_VERSION=$(echo 2.26 | ld_version)
if [ "$LD_VERSION" -ge "$LD_NO_DL_MIN_VERSION" ] ; then
nodl="--no-dynamic-linker"
fi
platformo=$object/"$platform".o
lds=$object/zImage.lds
@ -446,7 +468,7 @@ if [ "$platform" != "miboot" ]; then
text_start="-Ttext $link_address"
fi
#link everything
${CROSS}ld -m $format -T $lds $text_start $pie -o "$ofile" \
${CROSS}ld -m $format -T $lds $text_start $pie $nodl -o "$ofile" \
$platformo $tmp $object/wrapper.a
rm $tmp
fi