On Thursday 09 July 2009 23:21:06 Denys Vlasenko wrote:
> On Tuesday 07 July 2009 21:45, Tito wrote:
> > Hi,
> > I'm experiencing a strange behaviour of busybox.
> > I'm trying to use upx on an android g1 phone.
> > So far I was able to cross-compile a statically linked
> > and working copy of upx
> > upx compresses the executables on the phone just fine,
> > only busybox seems not to work as expected.
> > upx compresses it but when the compressed
> > busybox is launched it runs the command as
> > expected but never returns to the shell unless it is killed.
> > The only suspect log i can see after killing it is:
> >
> > <3>[ 3261.966003] init: untracked pid 5064 exited
> > <3>[ 3290.064056] init: untracked pid 5066 exited
> > <3>[ 3339.908325] init: untracked pid 5069 exited
> >
> > Any hints about what is going wrong here?
> >
> > BTW: busybox packed with upx on x86 works.
> >
> > /system/sd # ./upx busybox
> > Ultimate Packer for eXecutables
> > Copyright (C) 1996 - 2009
> > UPX 3.04 Markus Oberhumer, Laszlo Molnar & John Reiser Apr 27th
> > 2009
> >
> > File size Ratio Format Name
> > -------------------- ------ ----------- -----------
> > 690276 -> 381428 55.26% linux/armel busybox
> >
> > Packed 1 file.
> > /system/sd # ./busybox
> > BusyBox v1.14.2 (2009-07-01 18:27:27 EDT) multi-call binary
> > Copyright (C) 1998-2008 Erik Andersen, Rob Landley, Denys Vlasenko
> > and others. Licensed under GPLv2.
> > See source distribution for full notice.
> >
> > Usage: busybox [function] [arguments]...
> > or: function [arguments]...
> >
> > BusyBox is a multi-call binary that combines many common Unix
> > utilities into a single executable. Most people will create a
> > link to busybox for each function they wish to use and BusyBox
> > will act like whatever it was invoked as!
> >
> > Currently defined functions:
> > [, [[, arping, ash, awk, basename, bbconfig, bunzip2, bzcat,
> > bzip2, cat, catv, chgrp, chmod, chown, chroot, chrt, chvt, cksum,
> > clear, cmp, cp, cpio, crond, crontab, cut, date, dc, dd, deallocvt,
> > depmod, devmem, df, dhcprelay, diff, dirname, dmesg, dnsd, dos2unix,
> > du, dumpkmap, dumpleases, echo, egrep, env, ether-wake, expr,
> > false, fbset, fdisk, fgrep, find, fold, free, freeramdisk, fuser,
> > getopt, grep, gunzip, gzip, head, hexdump, hostname, hwclock,
> > ifconfig, ifdown, ifup, insmod, install, ip, ipaddr, iplink,
> > iproute, iprule, iptunnel, kbd_mode, kill, killall, killall5,
> > last, length, less, ln, loadfont, loadkmap, losetup, ls, lsmod,
> > makedevs, md5sum, mdev, mkdir, mkfifo, mknod, mkswap, mktemp,
> > modprobe, more, mount, mountpoint, mv, nameif, nc, netstat,
> > nice, nohup, nslookup, od, openvt, patch, pidof, ping,
> > pipe_progress,
> > pivot_root, printenv, printf, ps, pwd, rdate, rdev, readlink,
> > readprofile, realpath, renice, reset, rm, rmdir, rmmod, route,
> > run-parts, sed, seq, setconsole, setkeycodes, setlogcons, setsid,
> > sh, sha1sum, showkey, sleep, sort, split, stat, strings, stty,
> > swapoff, swapon, switch_root, sync, sysctl, tac, tail, tar,
> > tcpsvd, tee, telnet, telnetd, test, tftp, time, top, touch,
> > tr, traceroute, true, tty, udhcpd, udpsvd, umount, uname, uniq,
> > unix2dos, unzip, uptime, usleep, uudecode, uuencode, vconfig,
> > vi, watch, wc, wget, which, who, whoami, xargs, yes, zcat
> > Killed
>
> Try in libbb/appletlib.c:
>
>
> void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv)
> {
> int argc = 1;
>
> while (argv[argc])
> argc++;
>
> /* Reinit some shared global data */
> xfunc_error_retval = EXIT_FAILURE;
>
> applet_name = APPLET_NAME(applet_no);
> if (argc == 2 && strcmp(argv[1], "--help") == 0) {
> /* Special case. POSIX says "test --help"
> * should be no different from e.g. "test --foo". */
> //TODO: just compare applet_no with APPLET_NO_test
> if (!ENABLE_TEST || strcmp(applet_name, "test") != 0)
> bb_show_usage();
> }
> if (ENABLE_FEATURE_SUID)
> check_suid(applet_no);
> exit(applet_main[applet_no](argc, argv));
> }
>
> Replace
> exit(applet_main[applet_no](argc, argv));
> with
> printf("Entering applet_main\n");
> n = applet_main[applet_no](argc, argv);
> printf("Exited epplet_main, exiting...\n");
> exit(n);
>
> and let me know hat do you see when you run "busybox true".
> --
> vda
>
Hi,
things got a little trickier then expected.
Upx seems only to be able to compress Version4 EABI
binaries (like the copy of busybox I've got on the rom
of my phone, which shows the aforementioned bug)
but so far I've been able to compile only Version5 EABI
copies of busybox which upx cannot compress
( UnknownExecutableFormatException ).
I've tried different versions of the codesorcery toolchains
and different combinations of compiler switches
but with no luck, I always obtain a v5 binary.
Now I'm running out of ideas to try......
Hints are very very appreciated ;-)
Ciao,
Tito
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