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Bug#946469: initramfs-tools-core: unmkinitrams creates broken binaries

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  Bug#946469: initramfs-tools-core: unmkinitrams creates broken binaries Jen Bowen <debianfangirl@gmail.com> - 2019-12-09 17:10 +0100
    Bug#946469: initramfs-tools-core: unmkinitrams creates broken binaries Ben Hutchings <ben@decadent.org.uk> - 2020-01-18 18:10 +0100
    Processed: Re: initramfs-tools-core: unmkinitrams creates broken  binaries "Debian Bug Tracking System" <owner@bugs.debian.org> - 2020-01-18 18:10 +0100

#65847 — Bug#946469: initramfs-tools-core: unmkinitrams creates broken binaries

Package: initramfs-tools-core
Version: 0.135
Severity: normal

Dear Maintainer,

When unmkinitramfs is used on prepended initramfs images, such as the
initrd.img-5.3.0-2-amd64 generated by the linux-image-5.3.0-2-amd64 package,
the symlink at main/lib64/ld-linux-x86-64.so.2 is broken.  This seems to be a
result of the use of the "--no-absolute-filenames" flag with cpio.

If I remove this flag and run unmkinitramfs again, the symlink to the linker is
intact, and it's possible to chroot into the extracted initramfs image and run
binaries in main/bin .

I don't know if it's the intention of unmkinitramfs to create functional
binaries in the extracted images, but it's very helpful in my use case!

Thanks for your assistance.



-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.3.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_IE.utf8, LC_CTYPE=en_IE.utf8 (charmap=UTF-8), LANGUAGE=en_IE:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages initramfs-tools-core depends on:
ii  coreutils    8.30-3+b1
ii  cpio         2.13+dfsg-1
ii  e2fsprogs    1.45.4-1
ii  klibc-utils  2.0.7-1
ii  kmod         26-3
ii  logsave      1.45.4-1
ii  udev         244-3

Versions of packages initramfs-tools-core recommends:
ii  busybox  1:1.30.1-4
ii  pigz     2.4-1+b1

Versions of packages initramfs-tools-core suggests:
ii  bash-completion  1:2.9-1

-- no debconf information

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#66122

[Multipart message — attachments visible in raw view] — view raw

Control: reassign -1 cpio 2.13+dfsg-1

On Mon, 09 Dec 2019 15:58:54 +0000 Jen Bowen <debianfangirl@gmail.com> wrote:
> Package: initramfs-tools-core
> Version: 0.135
> Severity: normal
> 
> Dear Maintainer,
> 
> When unmkinitramfs is used on prepended initramfs images, such as the
> initrd.img-5.3.0-2-amd64 generated by the linux-image-5.3.0-2-amd64 package,
> the symlink at main/lib64/ld-linux-x86-64.so.2 is broken.  This seems to be a
> result of the use of the "--no-absolute-filenames" flag with cpio.

I think we need to use this option, so that it's safe to unpack an
untrusted initramfs image.

> If I remove this flag and run unmkinitramfs again, the symlink to the linker is
> intact, and it's possible to chroot into the extracted initramfs image and run
> binaries in main/bin .
> 
> I don't know if it's the intention of unmkinitramfs to create functional
> binaries in the extracted images, but it's very helpful in my use case!

It's not a specific goal, but the symlinks should not be broken.

This seems to be a regression in cpio: the filename restrictions
requested by this option are being applied to symlink targets, whereas
they should only be applied to destination filenames and hard link
targets.

Ben.
 
-- 
Ben Hutchings
Humans are not rational beings; they are rationalising beings.

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#66123 — Processed: Re: initramfs-tools-core: unmkinitrams creates broken binaries

Processing control commands:

> reassign -1 cpio 2.13+dfsg-1
Bug #946469 [initramfs-tools-core] initramfs-tools-core: unmkinitrams creates broken binaries
Bug reassigned from package 'initramfs-tools-core' to 'cpio'.
No longer marked as found in versions initramfs-tools/0.135.
Ignoring request to alter fixed versions of bug #946469 to the same values previously set
Bug #946469 [cpio] initramfs-tools-core: unmkinitrams creates broken binaries
Marked as found in versions cpio/2.13+dfsg-1.

-- 
946469: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=946469
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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