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  1. RHEL
  2. RHEL-24168

glibc: Rebase qsort to 2.39 upstream version [rhel-9.7]

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    • glibc-2.34-211.el9
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    • rhel-pt-c-libs
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    • PT Libraries 2025 S09
    • Enhancement
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      .Hardening of glibc `qsort` behavior on memory allocation failure

      When a memory allocation fails, the `qsort` and‎ `qsort_r` functions of the `glibc` package use a heapsort fallback. This change improves handling of invalid comparison functions and makes performance more predictable if a memory allocation fails.

      Because the fallback is not a stable sort, equal elements can appear in a different order. The C standard does not require stability.
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      .Hardening of glibc `qsort` behavior on memory allocation failure When a memory allocation fails, the `qsort` and‎ `qsort_r` functions of the `glibc` package use a heapsort fallback. This change improves handling of invalid comparison functions and makes performance more predictable if a memory allocation fails. Because the fallback is not a stable sort, equal elements can appear in a different order. The C standard does not require stability.
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      The upstream implementation of qsort and qsort_r improves hardening against buggy comparison functions, on the code path taken after a malloc failure.

      We should consider backporting this change into Red Hat Enterprise Linux 9.

      Changes from 2.39 at least up to and including this commit should be included:

      commit dfa3394a605c8f6f25e4f827789bc89eca1d206c
Author: Xi Ruoyao <xry111@xry111.site>
Date:   Tue Jan 23 04:29:18 2024 +0800

    qsort: Fix a typo causing unnecessary malloc/free (BZ 31276)

              skolosov@redhat.com Sergey Kolosov
              fweimer@redhat.com Florian Weimer
              Arjun Shankar Arjun Shankar
              Sergey Kolosov Sergey Kolosov
              Malhar Jivrajani Malhar Jivrajani
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                Created:
                Updated: