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Status Future consideration
Workspace z/TPF Product Family
Categories z/TPF
Created by Guest
Created on Mar 4, 2022

RELATED IDEAS

Update 3270 interrupt handling (CCP4) to close security loopholes

When using a 3270 subchannel that had previously been used with another application, and that session had not been logged-off (LOGO), the new session will still be logged-on to that application. When CCP4 (in CLOA) detects an unsolicited device end (DE), it should check the WGTA for that 3270 and force a LOGO (when it it not a permanently logged-in terminal). This way a new user is forced to always LOGI into a local application.

Also, when using Host-On-Demand (HOD), it does not attach to the OSA-C for all defined devices. When a device is reset with ZLSTP/ZLSTA, it is put in INTERVENTION REQUIRED state.

A check can be made in CLOG, asynchronous write interrupt routine, to check for a standalone ATTN. Then it can reset the status bits for the device and then load the ATTN BV to allow the user to hit ESC to clear the X SYSTEM and be able to access TPF without needing operator commands to clear the lock.

Idea priority Medium
  • Guest
    Reply
    |     Mar 15, 2022

    IBM intends to implement this with user exits.

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