Help needed in disabling busybox configuration for linux hardening requirement.

[purushi1 .]

Hi there,

Thanks for the solution, the changes fixed the linker error.

Thank you all and appreciate your help.

Best regards
Purushotham
On 15 Oct 2015 15:47, "Denys Vlasenko" <vda.linux at googlemail.com> wrote:

> On Thu, Oct 15, 2015 at 11:31 AM, purushi1 . <purushi1 at gmail.com> wrote:
> > Isaac and wh,
> >
> > Thanks for your comments.
> >
> > Want to understand a few more things.
> >
> > My objective here is to disable, the following config options?
> >
> >> CONFIG_BRCTL=y
> >> CONFIG_FEATURE_BRCTL_FANCY=y
> >> CONFIG_FEATURE_BRCTL_SHOW=y
> >
> > They are used in Brctl.c (uclinux-rootfs\user\busybox\networking), and on
> > disabling them, its resulting in Link error.
> > If the above three options are enabled then the build goes through fine.
> > Is there any other dependency to it,
> > ####################
> > --> making all in user/busybox
> > make[4]: Entering directory
> >
> '/projects/cc-ban-vwstg4/purush/KERNEL/3.3-3.4/Trial3/uclinux-rootfs/user/busybox'
> > /tools/oss/packages/x86_64-rhel5/make/default/bin/make -f Makefile
> > make[5]: Entering directory
> >
> '/projects/cc-ban-vwstg4/purush/KERNEL/3.3-3.4/Trial3/uclinux-rootfs/user/busybox'
> >   SPLIT   include/autoconf.h -> include/config/*
> >   GEN     include/bbconfigopts.h
> >   HOSTCC  applets/usage
> >   GEN     include/usage_compressed.h
> >   HOSTCC  applets/applet_tables
> >   GEN     include/applet_tables.h
> >   CC      applets/applets.o
> >   LD      applets/built-in.o
> >   HOSTCC  applets/usage_pod
> >   CC      libbb/appletlib.o
> >   AR      libbb/lib.a
> >   AR      networking/lib.a
> >   CC      shell/ash.o
> >   AR      shell/lib.a
> >   LINK    busybox_unstripped
> > Trying libraries: crypt m
> > Failed: -Wl,--start-group -lcrypt -lm -Wl,--end-group
> > Output of:
> > mipsel-linux-gcc -Os -fno-strict-aliasing -Wall -Wshadow -Wwrite-strings
> > -Wundef -Wstrict-prototypes -Wunused -Wunused-parameter -
> Wunused-function
> > -Wunused-value -Wmissing-prototypes -Wmissing-declarations
> > -Wno-format-security -Wdeclaration-after-statement -Wo
> > ld-style-definition -fno-builtin-strlen -finline-limit=0
> > -fomit-frame-pointer -ffunction-sections -fdata-sections -fno-guess-branc
> > h-probability -funsigned-char -static-libgcc -falign-functions=1
> > -falign-jumps=1 -falign-labels=1 -falign-loops=1 -fno-unwind-tabl
> > es -fno-asynchronous-unwind-tables -Os
> >
> --sysroot=/projects/cc-ban-vwstg4/purush/TOOLCHAIN/stbgcc-4.5.4-2.9/bin/../mipsel-linux-ucl
> > ibc/sys-root -Os -Dlinux -D__linux__ -Dunix -DEMBED -fno-builtin -Os
> > -fno-strict-aliasing -o busybox_unstripped -Wl,--sort-common
> > -Wl,--sort-section,alignment -Wl,--gc-sections -Wl,--start-group
> > applets/built-in.o archival/lib.a archival/libarchive/lib.a conso
> > le-tools/lib.a coreutils/lib.a coreutils/libcoreutils/lib.a
> > debianutils/lib.a e2fsprogs/lib.a editors/lib.a findutils/lib.a init/l
> > ib.a libbb/lib.a libpwdgrp/lib.a loginutils/lib.a mailutils/lib.a
> > miscutils/lib.a modutils/lib.a networking/lib.a networking/libip
> > route/lib.a networking/udhcp/lib.a printutils/lib.a procps/lib.a
> runit/lib.a
> > selinux/lib.a shell/lib.a sysklogd/lib.a util-linux/l
> > ib.a util-linux/volume_id/lib.a archival/built-in.o
> > archival/libarchive/built-in.o console-tools/built-in.o
> coreutils/built-in.o
> > c
> > oreutils/libcoreutils/built-in.o debianutils/built-in.o
> e2fsprogs/built-in.o
> > editors/built-in.o findutils/built-in.o init/built-in
> > .o libbb/built-in.o libpwdgrp/built-in.o loginutils/built-in.o
> > mailutils/built-in.o miscutils/built-in.o modutils/built-in.o netwo
> > rking/built-in.o networking/libiproute/built-in.o
> > networking/udhcp/built-in.o printutils/built-in.o procps/built-in.o
> > runit/built-
> > in.o selinux/built-in.o shell/built-in.o sysklogd/built-in.o
> > util-linux/built-in.o util-linux/volume_id/built-in.o -Wl,--end-group
> > -Wl,--start-group -lcrypt -lm -Wl,--end-group
> > ==========
> >
> /projects/cc-ban-vwstg4/purush/TOOLCHAIN/stbgcc-4.5.4-2.9/bin/../lib/gcc/mipsel-linux-uclibc/4.5.4/../../../../mipsel-linux-uclibc
> > /bin/ld:
> > can not make stub section: File format not recognized
> >
> /projects/cc-ban-vwstg4/purush/TOOLCHAIN/stbgcc-4.5.4-2.9/bin/../lib/gcc/mipsel-linux-uclibc/4.5.4/../../../../mipsel-linux-uclibc
> > /bin/ld:
> > failed to set dynamic section sizes: File format not recognized
> > collect2: ld returned 1 exit status
>
> This error has nothing to do with brctl.c
>
> Looks like your linker is buggy.
>
> Googling for "cannot make stub section: File format not recognized"
> found this:
> https://github.com/bigroma73/openembedded/blob/master/recipes/dbus/dbus.inc
>
> do_configure_prepend_mipsel() {
>     #this fixes error like "cannot make stub section: File format not
> recognized" with gcc 4.4.3
>     sed -i -e 's/-Wl,--gc-sections/--gc-sections/' configure.in
> }
>
> which suggests that some versions of ld are byggy for mipsel with that
> option.
>
> What is your ld -V?
>
> I suggest you to find this part of busybox/scripts/trylink:
>
> GC_SECTIONS=`(
> . ./.config
> if test x"$CONFIG_STATIC" = x"y"; then
>     check_libc_is_glibc "" "-Wl,--gc-sections"
> else
>     echo "-Wl,--gc-sections"
> fi
> )`
>
> # The --gc-sections option is not supported by older versions of ld
> if test -n "$GC_SECTIONS"; then
>     GC_SECTIONS=`check_cc "$GC_SECTIONS" ""`
> fi
>
>
> and just replace it with
>
> GC_SECTIONS=""
>
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