[Bug 2055175] Re: [UBUNTU 23.10] s390x: clone clobbers r7

[Frank Heimes]

Since the current glibc situation in Ubuntu is like this:
 libc6 | 2.35-0ubuntu3    | jammy           | amd64, arm64, armhf, i386, ppc64el, riscv64, s390x
 libc6 | 2.35-0ubuntu3.6  | jammy-security  | amd64, arm64, armhf, i386, ppc64el, riscv64, s390x
 libc6 | 2.35-0ubuntu3.6  | jammy-updates   | amd64, arm64, armhf, i386, ppc64el, riscv64, s390x
 libc6 | 2.38-1ubuntu6    | mantic          | amd64, arm64, armhf, i386, ppc64el, riscv64, s390x
 libc6 | 2.38-1ubuntu6.1  | mantic-security | amd64, arm64, armhf, i386, ppc64el, riscv64, s390x
 libc6 | 2.38-1ubuntu6.1  | mantic-updates  | amd64, arm64, armhf, i386, ppc64el, riscv64, s390x
 libc6 | 2.39-0ubuntu2    | noble           | amd64, arm64, armhf, i386, ppc64el, riscv64, s390x
it will affect Ubuntu 23.10 and 24.04 - marking those as target series.

** Tags added: noble

** Also affects: glibc (Ubuntu Mantic)
   Importance: Undecided
       Status: New

** Also affects: glibc (Ubuntu Noble)
   Importance: Undecided
       Status: New

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Title:
  [UBUNTU 23.10] s390x: clone clobbers r7

Status in Ubuntu on IBM z Systems:
  New
Status in glibc package in Ubuntu:
  New
Status in glibc source package in Mantic:
  New
Status in glibc source package in Noble:
  New

Bug description:
  === Description by STLI at de.ibm.com ==

  On s390x, if clone is called with NULL for child-function or stack
  argument, then r7 is clobbered. This bug is needed for glibc 2.37,
  2.38, 2.39. Please pick the committed bugfix.

  See
  - glibc bugzilla:
  Bug 31402 - clone (NULL, NULL, ...) clobbers %r7 register on s390{,x}
  https://sourceware.org/bugzilla/show_bug.cgi?id=31402

  - glibc-commit on master:
  S390: Do not clobber r7 in clone [BZ #31402]
  https://sourceware.org/git/?p=glibc.git;a=commit;h=02782fd12849b6673cb5c2728cb750e8ec295aa3

  - glibc-commit on release/2.37/master:
  https://sourceware.org/git/?p=glibc.git;a=commit;h=9a1bdd7df731a4bc60f72dbdc1b849e02cfa9c34

  - glibc-commit on release/2.38/master:
  https://sourceware.org/git/?p=glibc.git;a=commit;h=ee4806e978467d705b26ccb7dfddb9e0a710f8e4

  - glibc-commit on release/2.39/master:
  https://sourceware.org/git/?p=glibc.git;a=commit;h=e0910f1d3278f05439fb434ee528fc9be1b6bd5e

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