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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/31230] PLT rewrite failed without SELinux
Date: Mon, 15 Jan 2024 14:59:41 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31230

--- Comment #2 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3D457bd9cf2e27550dd66=
b2d8f3c5a8dbd0dfb398f

commit 457bd9cf2e27550dd66b2d8f3c5a8dbd0dfb398f
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Jan 12 10:19:41 2024 -0800

    x86-64: Check if mprotect works before rewriting PLT

    Systemd execution environment configuration may prohibit changing a mem=
ory
    mapping to become executable:

    MemoryDenyWriteExecute=3D
    Takes a boolean argument. If set, attempts to create memory mappings
    that are writable and executable at the same time, or to change existing
    memory mappings to become executable, or mapping shared memory segments
    as executable, are prohibited.

    When it is set, systemd service stops working if PLT rewrite is enabled.
    Check if mprotect works before rewriting PLT.  This fixes BZ #31230.
    This also works with SELinux when deny_execmem is on.
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

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