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Windows: allow cancelling long mount operations

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Add a root-driver abort IOCTL that bypasses the mount control mutex and sets cooperative KDF abort flags for the active mount.

Restrict abort requests to privileged callers or to the user that initiated the pending mount, and retry early wait-dialog cancel requests until the driver has registered the cancellable mount context.

Wire the wait dialog Cancel button to send the abort request through a fresh driver handle, and propagate ERR_USER_ABORT through header/cache processing.

Add a /cancelmount command-line switch that sends the same abort request without displaying UI, so users can cancel hidden-wait-dialog mount operations from another process.
This commit is contained in:
Mounir IDRASSI
2026-06-07 17:14:37 +09:00
parent 105425ebb0
commit 1871765a76
13 changed files with 437 additions and 23 deletions
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doc/html/en/Command Line Usage for Windows.html
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@@ -110,6 +110,10 @@ if it is followed by <strong>n </strong>or<strong> no</strong>: don't try to mou
If it is followed by <strong>n</strong> or <strong>no</strong>: force the display waiting dialog is displayed while performing operations.</td>
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<td><em>/cancelmount</em></td>
<td>Cancels any currently running mount operation and exits without displaying a status message. The process returns exit code 0 when the cancel request is accepted by the driver, or 1 otherwise.</td>
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<td><em>/secureDesktop</em></td>
<td>If it is followed by <strong>y</strong> or <strong>yes</strong> or if no parameter is specified: display password dialog and token PIN dialog in a dedicated secure desktop to protect against certain types of attacks.<br>
If it is followed by <strong>n</strong> or <strong>no</strong>: the password dialog and token PIN dialog are displayed in the normal desktop.</td>