NetBSD Problem Report #60083

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Date: Sun, 15 Mar 2026 03:33:02 +0000 (UTC)
From: imuwoto@gmail.com
Reply-To: imuwoto@gmail.com
To: gnats-bugs@NetBSD.org
Subject: swap encryption break /dev/drum
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X-From4GNATS: "imuwoto@gmail.com via gnats" <gnats-admin@NetBSD.org>

>Number:         60083
>Notify-List:    riastradh@NetBSD.org
>Category:       kern
>Synopsis:       swap encryption break /dev/drum
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 15 03:35:00 +0000 2026
>Last-Modified:  Sat Jun 27 15:00:11 +0000 2026
>Originator:     YAMAMOTO Takashi
>Release:        -current
>Organization:
>Environment:
amd64
>Description:
swap encryption is implemented in uvm_swap_io.
it seems conceptually wrong because /dev/drum users like libkvm
need to see unencrypted data.

>How-To-Repeat:
read /dev/drum to obtain swapped-out data as libkvm sometimes does.
>Fix:
implement it under /dev/drum.

>Release-Note:

>Audit-Trail:

From: Takashi YAMAMOTO <yamt9999@gmail.com>
To: gnats-bugs@netbsd.org
Cc: kern-bug-people@netbsd.org, gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Subject: Re: kern/60083: swap encryption break /dev/drum
Date: Tue, 31 Mar 2026 05:57:57 +0900

 i'm testing this:
 https://github.com/yamt/netbsd-src/commit/960ea14b08e76fc0d032221a742aea61ea6ded5b

From: "YAMAMOTO Takashi" <yamt@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/60083 CVS commit: src/sys/uvm
Date: Tue, 31 Mar 2026 13:44:23 +0000

 Module Name:	src
 Committed By:	yamt
 Date:		Tue Mar 31 13:44:23 UTC 2026

 Modified Files:
 	src/sys/uvm: uvm_swap.c

 Log Message:
 uvm_swap.c: fix /dev/drum regression caused by swap encryption

 * decrypt data using a bounce buffer

 * reject writes with ENOTSUP for now

 https://gnats.netbsd.org/60083
 PR/60083


 To generate a diff of this commit:
 cvs rdiff -u -r1.229 -r1.230 src/sys/uvm/uvm_swap.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

From: "Taylor R Campbell" <riastradh@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/60083 CVS commit: src/sys/uvm
Date: Sat, 27 Jun 2026 14:56:29 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Sat Jun 27 14:56:29 UTC 2026

 Modified Files:
 	src/sys/uvm: uvm_swap.c

 Log Message:
 uvm(9): Fix comments on swap encryption and tidy various whitespace.

 No functional change intended: comments and whitespace only.

 Cleanup after various fixes for:

 PR kern/60082: swap encryption corrupt data
 PR kern/60083: swap encryption break /dev/drum
 PR kern/60084: swap encryption: per-page tracking seems overengineered


 To generate a diff of this commit:
 cvs rdiff -u -r1.233 -r1.234 src/sys/uvm/uvm_swap.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

>Unformatted:

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