[newlib-cygwin/main] Cygwin: doc: warn about unprivileged access to raw devices

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=8065978ff838f393dfbc7e61374df56f1f157847

commit 8065978ff838f393dfbc7e61374df56f1f157847
Author:     Christian Franke <christian.franke@t-online.de>
AuthorDate: Mon Jul 14 14:44:01 2025 +0200
Commit:     Corinna Vinschen <corinna@vinschen.de>
CommitDate: Mon Jul 14 15:29:23 2025 +0200

    Cygwin: doc: warn about unprivileged access to raw devices
    
    Raw devices of partitions may be accessible from unprivileged
    processes, for example if connected via USB.
    
    Signed-off-by: Christian Franke <christian.franke@t-online.de>

Diff:
---
 winsup/doc/specialnames.xml | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/winsup/doc/specialnames.xml b/winsup/doc/specialnames.xml
index a1f9d3f5e806..02375e737ecf 100644
--- a/winsup/doc/specialnames.xml
+++ b/winsup/doc/specialnames.xml
@@ -368,7 +368,15 @@ handle the information.  <emphasis role='bold'>Writing</emphasis> to a raw
 mass storage device you should only do if you
 <emphasis role='bold'>really</emphasis> know what you're doing and are aware
 of the fact that any mistake can destroy important information, for the
-device, and for you.  So, please, handle this ability with care.
+device, and for you.  So, please, handle this ability with care.</para>
+
+<para><emphasis role='bold'>Important:</emphasis> Windows may allow raw read
+<emphasis role='bold'>and write</emphasis> access to partitions (for example
+<filename>/dev/sda2</filename>) even from unprivileged processes.  This is
+usually the case for partitions on "removable" drives like USB flash drives
+or regular SATA/NVMe drives behind USB docking stations.  If
+<command>chkdsk X:</command> works, raw access to the same partition is
+possible from the same user account.
 <emphasis role='bold'>You have been warned.</emphasis></para></note>
 
 <para>