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Bug#903931: [initramfs-tools-core] unmkinitramfs uses "-t" for zcat like it was a "test integrity" option (it's not and it causes crashes)

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Control: reassign -1 gzip
Control: retitle -1 zcat -t sometimes crashes with heap corruption
Control: tag -1 moreinfo

On Mon, 16 Jul 2018 20:17:13 +0000 (UTC) john terragon <terragonjohn@yahoo.com> wrote:
[...]
> the -t flag used with zcat does not have the same meaning it had with
the other programs, xzcat, bzip2 and lzop. With the latter it
> means "just do  a test" with the former it is equivalent to -vT
(neither -v nor -T means "test").

The manual page for zcat clearly states that -t does an integrity test.
 If it does not, that's a bug in zcat.

> Now, this causes a strange and
> unpredictable behavior of unmkinitramfs (and of lsinitramfs, which
uses unmkinitramfs) where for some, not all, initrd files it just
aborts its operations with this
>
> free(): invalid next size (normal)
> 
> Aborted
[...]

Crashing on weird input is a bug in the program that crashes.

Please report which version of gzip is installed.

Ben.

-- 
Ben Hutchings
Logic doesn't apply to the real world. - Marvin Minsky

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Bug#903931: [initramfs-tools-core] unmkinitramfs uses "-t" for zcat like it was a "test integrity" option (it's not and it causes crashes) john terragon <terragonjohn@yahoo.com> - 2018-07-16 22:30 +0200
  Processed: Re: [initramfs-tools-core] unmkinitramfs uses "-t" for  zcat like it was a "test integrity" option (it's not and it causes  crashes) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2018-07-18 07:10 +0200
  Bug#903931: [initramfs-tools-core] unmkinitramfs uses "-t" for zcat like it was a "test integrity" option (it's not and it causes crashes) Ben Hutchings <ben@decadent.org.uk> - 2018-07-18 07:10 +0200
  Bug#903931: Neither zcat nor xzcat should be used in scripts Antonio Diaz Diaz <antonio@gnu.org> - 2018-07-27 09:50 +0200
  Bug#903931: Maybe trailing garbage or data in an unsupported format is causing the problem? Antonio Diaz Diaz <antonio@gnu.org> - 2018-07-30 00:50 +0200

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