Red Hat Bugzilla – Bug 141093
segfault in mkisofs
Last modified: 2007-11-30 17:07:14 EST
Description of problem: segfault and NULL pointer messages from mkisofs Version-Release number of selected component (if applicable): 2.01.0.a38 How reproducible: allways Steps to Reproduce: 1.rm -rf /tmp/Isolinux 2.cp -vfpr /var/local/mirrors/linux/RHEL/3.95/i386/os/isolinux /tmp/ 3.mv -f /tmp/isolinux /tmp/Isolinux 4.mkisofs -o EL395-dvd.iso -A 'EL/3.95 i386' -V 'EL/3.95 i386' -J -R -T -q -x ./lost+found -no-emul-boot -boot-load-size 4 -boot-info-table -x isolinux /tmp/Isolinux /var/local/mirrors/linux/RHEL/3.95/i386/os Actual results: /home/summer/bin/RHEL-DVD: line 20: 18249 Segmentation fault mkisofs -o EL395-dvd.iso -A "EL/3.95 i386" -V "EL/3.95 i386" -J -R -T -q -x ./lost+found -no-emul-boot -boot-load-size 4 -boot-info-table -x isolinux /tmp/Isolinux /var/local/mirrors/linux/RHEL/3.95/i386/os Expected results: And iso at EL395-dvd.iso Additional info: Probably this is related: + mv -f /tmp/isolinux /tmp/Isolinux + mkisofs -o EL395-dvd.iso -b Isolinux/isolinux.bin -A 'EL/3.95 i386' -V 'EL/3.95 i386' -J -R -T -q -x ./lost+found -c Isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -x isolinux /tmp/Isolinux /var/local/mirrors/linux/RHEL/3.95/i386/os Unknown file type (unallocated) /tmp/Isolinux/.. - ignoring and continuing. mkisofs: Uh oh, I cant find the boot catalog directory 'Isolinux'! The primary source is an unpacked Nahant AS CD set.
Will have to poke into why mkisofs is falling over, but your second example above isn't correct mkisofs syntax in the first place, hence the error message. Both the boot catalog and the boot image need to be specified relative to the source paths listed on the command line, so the command above is telling mkisofs to look for "Isolinux/isolinux.bin" and "Isolinux/boot.cat" in the "/tmp/Isolinux" and "/var/local/mirrors/linux/RHEL/3.95/i386/os" directories, where, of course, it doesn't exist. Running the following command does indeed work, however: mkisofs -o EL395-dvd.iso -b isolinux.bin -A 'EL/3.95 i386' -V 'EL/3.95 i386' -J -R -T -q -x ./lost+found -c boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -x ./isolinux /tmp/Isolinux /var/local/mirrors/linux/RHEL/3.95/i386/os
Fix summary typo.
I since have create a working commandline. I'venot yet established that it does what I want though. I suggest that mkisofs should be properly validating parameter info including checking for consistency and that it's not doing this. This would likely give rise to erroneous messages and segfaults, and quite possibly in some contexts, security exposures. I know my commandline was wrong, but that doesn't make messages about null pointers (whoops I didn't actually show that one) permissable. Luckily I still have one: + mkisofs -o EL394-dvd.iso -b isolinux/isolinux.bin -A 'EL/3.94 i386' -V 'EL/3.9 4 i386' -J -R -T -q -x ./lost+found -c isolinux/boot.cat -no-emul-boot -boot-loa d-size 4 -boot-info-table /tmp/isolinux /var/local/mirrors/linux/RHEL/3.95/i386/ os Unknown file type (unallocated) /tmp/isolinux/.. - ignoring and continuing. mkisofs: Error: (NULL POINTER) and /var/local/mirrors/linux/RHEL/3.95/i386/os/is olinux/boot.cat have the same Joliet name