[Bug libc/24882] login: pututline uses potentially outdated cache

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=24882

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.30/master branch has been updated by Florian Weimer
<fw@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=83f793e6a63c4bdd1b2f39618040a8317562a1f7

commit 83f793e6a63c4bdd1b2f39618040a8317562a1f7
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Nov 7 18:15:18 2019 +0100

    login: Acquire write lock early in pututline [BZ #24882]

    It has been reported that due to lack of fairness in POSIX file
    locking, the current reader-to-writer lock upgrade can result in
    lack of forward progress.  Acquiring the write lock directly
    hopefully avoids this issue if there are only writers.

    This also fixes bug 24882 due to the cache revalidation in
    __libc_pututline.

    Reviewed-by: Carlos O'Donell <carlos@redhat.com>
    Change-Id: I57e31ae30719e609a53505a0924dda101d46372e
    (cherry picked from commit be6b16d975683e6cca57852cd4cfe715b2a9d8b1)

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