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modnaruved
Apprentice
Apprentice


Joined: 21 Mar 2011
Posts: 158

PostPosted: Fri Sep 12, 2014 2:01 am    Post subject: using LD_PRELOAD Reply with quote

Hi

I need to run some specific hot patch, using LD_PRELOAD trick, but any examples to use this not working

Ive something like:
"LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored."
or another message when compile with flag -m32 or -m64:

"from LD_PRELOAD cannot be preloaded (only ET_DYN and ET_EXEC can be loaded): ignored."

Is it possible to run application in modern gentoo with LD_PRELOAD?

Any simple example with code?

my info:
Code:
Portage 2.2.8-r1 (default/linux/amd64/13.0/desktop/kde, gcc-4.7.3, glibc-2.19-r1, 3.14.14-gentoo i686)
=================================================================
System uname: Linux-3.14.14-gentoo-i686-AMD_A10-4600M_APU_with_Radeon-tm-_HD_Graphics-with-gentoo-2.2
KiB Mem:     2050096 total,     31804 free
KiB Swap:    4716536 total,   4688376 free
Timestamp of tree: Fri, 05 Sep 2014 23:15:01 +0000
ld GNU ld (Gentoo 2.20.1 p1.2) 2.20.1.20100303
ccache version 3.1.9 [enabled]
app-shells/bash:          4.2_p45
dev-java/java-config:     2.2.0
dev-lang/python:          2.7.7, 3.3.5-r1
dev-util/ccache:          3.1.9-r3
dev-util/cmake:           2.8.12.2-r1
dev-util/pkgconfig:       0.28-r1
sys-apps/baselayout:      2.2
sys-apps/openrc:          0.12.4
sys-apps/sandbox:         2.6-r1
sys-devel/autoconf:       2.13, 2.69
sys-devel/automake:       1.11.6, 1.12.6, 1.13.4
sys-devel/binutils:       2.20.1-r1
sys-devel/gcc:            3.4.6-r2, 4.7.3-r1
sys-devel/gcc-config:     1.7.3
sys-devel/libtool:        2.4.2-r1
sys-devel/make:           3.82-r4
sys-kernel/linux-headers: 3.13 (virtual/os-headers)
sys-libs/glibc:           2.19-r1
Repositories: gentoo
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -march=native -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-O2 -march=native -pipe"
DISTDIR="/usr/portage/distfiles"
EMERGE_DEFAULT_OPTS="--jobs=2 --load-average=1"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs ccache config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="        http://mirror.netcologne.de/gentoo/ http://cesium.di.uminho.pt/pub/gentoo/ http://91.121.124.139/gentoo-distfiles/ http://mirror.yandex.ru/gentoo-distfiles/ http://ftp.snt.utwente.nl/pub/os/linux/gentoo http://ftp-stud.hs-esslingen.de/pub/Mirrors/gentoo/ http://gentoo.bloodhost.ru/ http://mirror2.corbina.ru/gentoo-distfiles/"
LANG="ru_RU.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY=""
SYNC="rsync://rsync.de.gentoo.org/gentoo-portage"
USE="X a52 aac acl acpi alsa amd64 bash-completion berkdb bluetooth branding bzip2 cairo cdda cdr cli consolekit cracklib crypt cups cxx dbus declarative dri dts dvd dvdr emboss encode exif fam firefox flac fortran gdbm gif gpm iconv ipv6 jpeg kde kipi lcms libnotify mad mmx mng modules mp3 mp4 mpeg multilib ncurses nls nptl ogg opengl openmp pam pango pcre pdf phonon plasma png policykit ppds qt3support qt4 readline sdl semantic-desktop session spell sse sse2 ssl startup-notification svg tcpd tiff truetype udev udisks unicode usb vorbis wxwidgets x264 xcb xcomposite xinerama xml xscreensaver xv xvid zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="fbdev glint intel mach64 mga nouveau nv r128 radeon savage sis tdfx trident vesa via vmware dummy v4l" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset:  CPPFLAGS, CTARGET, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
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Hu
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Joined: 06 Mar 2007
Posts: 21490

PostPosted: Fri Sep 12, 2014 10:57 pm    Post subject: Reply with quote

Yes, this works fine. Please provide an exact error message and steps to reproduce. Paraphrasing loses important information.
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modnaruved
Apprentice
Apprentice


Joined: 21 Mar 2011
Posts: 158

PostPosted: Sat Sep 13, 2014 11:13 am    Post subject: Reply with quote

Hu wrote:
Yes, this works fine. Please provide an exact error message and steps to reproduce. Paraphrasing loses important information.


For example this approach not run on my system:
http://bit.ly/1qRExpW

(just googled first relevant example with gcc and LD_PRELOAD)
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Hu
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Joined: 06 Mar 2007
Posts: 21490

PostPosted: Sat Sep 13, 2014 3:28 pm    Post subject: Reply with quote

This is not Twitter. You can post a full URL.
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