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Bug#989509: buster-pu: package klibc/2.0.6-1+deb10u1

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  Bug#989509: buster-pu: package klibc/2.0.6-1+deb10u1 Ben Hutchings <ben@decadent.org.uk> - 2021-06-05 21:00 +0200

#72113 — Bug#989509: buster-pu: package klibc/2.0.6-1+deb10u1

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Package: release.debian.org
Severity: normal
Tags: buster
User: release.debian.org@packages.debian.org
Usertags: pu
X-Debbugs-Cc: debian-kernel@lists.debian.org, mirabilos <tg@debian.org>

[ Reason ]
There are open security issues that were triaged as no-dsa by the
security team.  These affect the heap functions (malloc and calloc)
and the cpio utility.

setjmp and longjmp are implemented incorrectly on s390x.

[ Impact ]
Some programs built using klibc may have potential heap overflows
that can be exploited for privilege escalation.

On s390x, programs using setjmp and longjmp may misbehave in
unpredictable ways.

[ Tests ]
malloc, calloc, setjmp, and longjmp are exercised by the test suite
that runs during build.  However the setjmp/longjmp test was not
sufficient to detect the bug.

Thorsten Glaser tested the s390x fix in unstable.  It has not (yet)
been manually tested in this version.

I have tested the cpio utility manually.

[ Risks ]
The changes are localised and seem comparatively low-risk to me.

[ Checklist ]
  [X] *all* changes are documented in the d/changelog
  [X] I reviewed all changes and I approve them
  [X] attach debdiff against the package in (old)stable
  [X] the issue is verified as fixed in unstable

[ Changes ]
All but one of the patches fixes a single bug or CVE as detailed in
its patch header.

The patch "malloc: Set errno on failure" is applied as a dependency
of "malloc: Fail if requested size > PTRDIFF_MAX".

[ Other info ]

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