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Bug#879773: stretch-pu: package syslinux/3:6.03+dfsg-14.1+deb9u1

Package: release.debian.org
User: release.debian.org@packages.debian.org
Usertags: pu
Tags: stretch
Severity: normal
X-Debbugs-CC: debian-cd@lists.debian.org, debian-boot@lists.debian.org, kibi@debian.org

Dear release team and other involved parties,

I hereby ask for permission to update the syslinux package in stretch.
There has been a short discussion about this on debian-cd already [1].
The request is about fixing the following three problems:

1. Booting from ext4 filesystems created with Debian stretch does not
   work, because ext4's 64bit feature is enabled by default (since
   Debian stretch) and not supported by syslinux [2].
2. Booting from btrfs does not work either for a similar reason [3].
3. A bug in the isolinux isohybrid MBR causing boot failures with some
   old BIOS [4].

[1] https://lists.debian.org/debian-cd/2017/10/msg00032.html
[2] https://bugs.debian.org/833057
[3] https://bugs.debian.org/865462
[4] https://bugs.debian.org/879004

Problems 1 and 2 are regressions from jessie (due to changes in default
options when creating ext4/btrfs filesystems), while problem 3 affects
jessie as well.  The fix for each of the three bugs has been
cherry-picked from upstream and has a reasonably sized diff.  Debian
testing and unstable already have the fixes.

I've tested the proposed version.  In those tests, the problems 1 and 2
were solved as expected.  As for problem 3, I've verified that the
isohdpfx.bin image built is identical to a known good and tested
version.  Additionally we got a report that the debian-cd images for
testing (which are built using the fixed isohdpfx.bin) boot correctly on
affected hardware [5].

A debdiff of the proposed update is attached.  Alternatively it's also
available from the debian/stretch branch of the git repository [6].

Thank you for your time and consideration

PS: If this request gets ACKed, I also intend to fix the isohybrid MBR
    in jessie (as advised by Steve McIntyre).

[5] https://bugs.debian.org/857597#117
[6] https://anonscm.debian.org/git/debian-cd/syslinux.git

Attachment: syslinux_6.03+dfsg-14.1+deb9u1.debdiff
Description: Binary data

Attachment: pgpzzWq_a2K69.pgp
Description: OpenPGP digital signature

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