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bug#23498: grub2 gzio suffers from output buffer overrun when unzipping


From: Elmar Stellnberger
Subject: bug#23498: grub2 gzio suffers from output buffer overrun when unzipping fdubcd.img.gz
Date: Mon, 9 May 2016 22:59:45 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.0

   Package: grub
   Version: 1:2.02.beta2

See for the buffer overrun message at:
http://elstel.rivido.de/uploads/grub-gzio/screenshot.jpeg

The respective .gz file which can not be unpacked is:
http://elstel.rivido.de/uploads/grub-gzio/fdubcd.img.gz

The following menuentry produces the gzip buffer overrun:

  menuentry 'FreeDOS' {
    insmod gzio
    insmod memdisk
    linux16 (hd0,msdos18)/boot/syslinux/memdisk
    initrd16 (hd0,msdos18)/ubcd/images/fdubcd.img.gz
  }

A similar syslinux entry works fine:

LABEL -
MENU LABEL UBCD FreeDOS R1.52 (Based on NwDsk V3.40)
TEXT HELP
FreeDOS boot disk used to run many of the other DOS apps on the UBCD. Revised
 version of Eric Veermans' FreeDOS NwDsk 3.40. Addresses many bug fixes,
 performance enhancements and compatibility issues.
ENDTEXT
COM32 linux.c32 memdisk
INITRD /ubcd/images/fdubcd.img.gz






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