* sys-apps/file Latest version available: 4.13 Latest version installed: 4.13 QQQ is an empty file. erik@g:~$ file --mime qqq qqq: application/x-empty if i do the following C program with libmagic: magic_buffer(mycookie, 0, 0); i get a segfault in libmagic. that's not ok. it should instead return "application/x-empty" if i do: char a[10]={0,0,0,0,0,0,0,0,0,0}; magic_buffer(mycookie,a,0); it returns "text/plain" instead of "application/x-empty" both issues must be fixed Reproducible: Always Steps to Reproduce: Portage 2.0.51.22-r2 (default-linux/x86/2005.0, gcc-3.3.6, glibc-2.3.5-r1, 2.6.1 2-gentoo-r10 i686) ================================================================= System uname: 2.6.12-gentoo-r10 i686 Intel(R) Pentium(R) 4 CPU 3.00GHz Gentoo Base System version 1.6.13 ccache version 2.3 [enabled] dev-lang/python: 2.3.5-r2 sys-apps/sandbox: 1.2.12 sys-devel/autoconf: 2.13, 2.59-r6 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6 sys-devel/binutils: 2.15.92.0.2-r10 sys-devel/libtool: 1.5.18-r1 virtual/os-headers: 2.6.11-r2 ACCEPT_KEYWORDS="x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=pentium4 -pipe -fomit-frame-pointer" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.3/env /usr/kde/3.3/share /config /usr/kde/3.3/shutdown /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kd e/3.4/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb /usr/lib/mozilla/default s/pref /usr/share/config /usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips /config/ /usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config / /usr/share/texmf/xdvi/ /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d" CXXFLAGS="-O2 -march=pentium4 -pipe -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig ccache distlocks nostrip sandbox sfperms strict" GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/Linux/ distributions/gentoo" LANG="de_DE" LINGUAS="de" MAKEOPTS="-j4" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="x86 X alsa apm arts avi berkdb bitmap-fonts cdr crypt cups curl doc dvd eds emboss encode esd fam flac font-server foomaticdb fortran gd gdbm gif gimpprint gnome gphoto2 gpm gstreamer gtk gtk2 imagemagick imlib java jpeg kde ldap libg+ + libwww mad mikmod motif mozilla mp3 mpeg ncurses nls ogg oggvorbis opengl oss pam pdflib perl png postgres ppds python qt quicktime readline samba scanner sdl slang spell ssl tcltk tcpd tetex tiff truetype truetype-fonts type1-fonts usb v orbis xine xml2 xmms xv zlib linguas_de userland_GNU kernel_linux elibc_glibc" Unset: ASFLAGS, CTARGET, LC_ALL, LDFLAGS, PORTDIR_OVERLAY
pretty sure file-4.15 fixes this, please check
i checked with file-4.15. problem is not solved there.
post the actual code you're using that is causing the segfault
****** FIRST PROGRAM: #include <magic.h> #include <stdio.h> void main() { magic_t m = magic_open(MAGIC_MIME); printf("magic_open returned %p\n", m); printf("magic_load returned %d\n", magic_load(m, 0)); printf("magic_buffer returned %s\n", magic_buffer(m, 0, 0)); } gcc -Wall mbug1.c -lmagic erik@g:~/magicbug$ ./a.out magic_open returned 0x804a050 magic_load returned 0 Segmentation Fault erik@g:~/magicbug$ the segmentation fault occurs inside the magic_buffer function. ****** SECOND PROGRAM: #include <magic.h> #include <stdio.h> void main() { magic_t m = magic_open(MAGIC_MIME); printf("magic_open returned %p\n", m); printf("magic_load returned %d\n", magic_load(m, 0)); char buf[10]={0,0,0,0,0,0,0,0,0,0}; printf("magic_buffer returned %s\n", magic_buffer(m, buf, 0)); } gcc -Wall mbug2.c -lmagic erik@g:~/magicbug$ ./a.out magic_open returned 0x804a050 magic_load returned 0 magic_buffer returned text/plain; charset=us-ascii erik@g:~/magicbug$ the result is wrong here. - he is accessing "buf" even though the size is zero. - he returns text/plain, even though he returns application/x-empty on an empty file usually, see: erik@g:~/magicbug$ touch emptyfile erik@g:~/magicbug$ file --mime emptyfile emptyfile: application/x-empty erik@g:~/magicbug$
fixed in 4.15
erik@goofy:~$ cd magicbug/ erik@goofy:~/magicbug$ cat mbug1.c #include <magic.h> #include <stdio.h> void main() { magic_t m = magic_open(MAGIC_MIME); printf("magic_open returned %p\n", m); printf("magic_load returned %d\n", magic_load(m, 0)); printf("magic_buffer returned %s\n", magic_buffer(m, 0, 0)); } erik@goofy:~/magicbug$ gcc mbug1.c -o mbug1 -lmagic mbug1.c: In Funktion
erik@goofy:~$ cd magicbug/ erik@goofy:~/magicbug$ cat mbug1.c #include <magic.h> #include <stdio.h> void main() { magic_t m = magic_open(MAGIC_MIME); printf("magic_open returned %p\n", m); printf("magic_load returned %d\n", magic_load(m, 0)); printf("magic_buffer returned %s\n", magic_buffer(m, 0, 0)); } erik@goofy:~/magicbug$ gcc mbug1.c -o mbug1 -lmagic mbug1.c: In Funktion »main«: mbug1.c:5: Warnung: Rückgabetyp von »main« ist nicht »int« erik@goofy:~/magicbug$ ./mbug1 magic_open returned 0x804a050 magic_load returned 0 Segmentation Fault erik@goofy:~/magicbug$ cat mbug2.c #include <magic.h> #include <stdio.h> void main() { magic_t m = magic_open(MAGIC_MIME); printf("magic_open returned %p\n", m); printf("magic_load returned %d\n", magic_load(m, 0)); char buf[10]={0,0,0,0,0,0,0,0,0,0}; printf("magic_buffer returned %s\n", magic_buffer(m, buf, 0)); } erik@goofy:~/magicbug$ gcc mbug2.c -o mbug2 -lmagic mbug2.c: In Funktion »main«: mbug2.c:5: Warnung: Rückgabetyp von »main« ist nicht »int« erik@goofy:~/magicbug$ ./mbug2 magic_open returned 0x804a050 magic_load returned 0 magic_buffer returned text/plain; charset=us-ascii erik@goofy:~/magicbug$ root@goofy:~# emerge search file * sys-apps/file Latest version available: 4.15 Latest version installed: 4.15 Size of downloaded files: 533 kB Homepage: ftp://ftp.astron.com/pub/file/ Description: identify a file's format by scanning binary data for patterns License: as-is the bug is NOT fixed in 4.15 !!!
it is fixed, i just didnt revbump it because this bug is insignificant
