It may still be better to add it to match the style. On i386, also. It is quite surprising compiler behaviour to create a PLT for such .rodata..
Alexander Bluhm <alexander.bl...@gmx.net> wrote: > On Thu, Apr 20, 2023 at 05:21:37PM -0600, Theo de Raadt wrote: > > I wonder if the same happens on arm64. > > On amd64 with the strange behavior linking gapdummy.o to gap.o adds > a .plt. > > root@ot32:.../obj# objdump -s gapdummy.o | grep 'Contents of section' > Contents of section .note.gnu.property: > root@ot32:.../obj# objdump -s gap.o | grep 'Contents of section' > Contents of section .text: > Contents of section .rodata: > Contents of section .data: > Contents of section .plt: > Contents of section .note.gnu.property: > > On arm64 we get the .note.gnu.property, but no .plt. No .plt in > bsd. > > root@ot11:.../obj# objdump -s gapdummy.o | grep 'Contents of section' > Contents of section .note.gnu.property: > Contents of section .comment: > root@ot11:.../obj# objdump -s gap.o | grep 'Contents of section' > Contents of section .text: > Contents of section .rodata: > Contents of section .data: > Contents of section .comment: > Contents of section .note.gnu.property: > > With my fix (compiling -fcf-protection=none gapdummy.c) on amd64 > neither .note.gnu.property nor .plt is added. > > bluhm@t430s:.../obj$ objdump -s gapdummy.o | grep 'Contents of section' > bluhm@t430s:.../obj$ objdump -s gap.o | grep 'Contents of section' > Contents of section .text: > Contents of section .rodata: > Contents of section .data: > > Don't know if we want to change anything on arm64. > > bluhm
