Re: Swap still not activated on later kernels

[Sreyan Chakravarty <sreyan32@xxxxxxxxx>]

On Fri, Nov 13, 2020 at 4:00 PM Ed Greshko <ed.greshko@xxxxxxxxxxx> wrote:

> Looking at https://bbs.archlinux.org/viewtopic.php?id=256614 and the URL's contained within
> it seems doing a
>
> dd if=/dev/zero of=/fedora.swap bs=1M count=2048 status=progress
>
> may cure the w(hole) issue.  :-)
>

Sorry, the count above was for a 2GB swap file.  Increase it to cover your 8GB file.

dd if=/dev/zero of=/fedora.swap bs=1M count=8192 status=progress

This command has partially solved my problem

But I have a couple of questions,

1) Why doesn't fallocate work anymore ?

2) I tried        dd if=/dev/zero of=/fedora.swap bs=1 count=0 seek=8G

This did not work. swapon complained about files being full of holes.

What is so special about bs=1M ?

I now have a new problem.

SELinux is preventing systemd-logind to read the swap file.

Here is the message:

SELinux is preventing systemd-logind from read access on the file /fedora.swap.

*****  Plugin restorecon (99.5 confidence) suggests   ************************

If you want to fix the label.
/fedora.swap default label should be etc_runtime_t.
Then you can run restorecon. The access attempt may have been stopped due to insufficient permissions to access a parent directory in which case try to change the following command accordingly.
Do
# /sbin/restorecon -v /fedora.swap

*****  Plugin catchall (1.49 confidence) suggests   **************************

If you believe that systemd-logind should be allowed read access on the fedora.swap file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c 'systemd-logind' --raw | audit2allow -M my-systemdlogind
# semodule -X 300 -i my-systemdlogind.pp

Additional Information:
Source Context                system_u:system_r:systemd_logind_t:s0
Target Context                unconfined_u:object_r:swapfile_t:s0
Target Objects                /fedora.swap [ file ]
Source                        systemd-logind
Source Path                   systemd-logind
Port                          <Unknown>
Host                          localhost.HPNotebook
Source RPM Packages          
Target RPM Packages          
SELinux Policy RPM            selinux-policy-targeted-3.14.5-44.fc32.noarch
Local Policy RPM              selinux-policy-targeted-3.14.5-44.fc32.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     localhost.HPNotebook
Platform                      Linux localhost.HPNotebook 5.8.18-200.fc32.x86_64
                              #1 SMP Mon Nov 2 19:49:11 UTC 2020 x86_64 x86_64
Alert Count                   3
First Seen                    2020-11-13 17:59:22 IST
Last Seen                     2020-11-13 17:59:22 IST
Local ID                      375aec7e-f77d-47ab-865a-f83a47c12423

Raw Audit Messages
type=AVC msg=audit(1605270562.371:320): avc:  denied  { read } for  pid=1256 comm="systemd-logind" name="fedora.swap" dev="dm-2" ino=13 scontext=system_u:system_r:systemd_logind_t:s0 tcontext=unconfined_u:object_r:swapfile_t:s0 tclass=file permissive=0


Hash: systemd-logind,systemd_logind_t,swapfile_t,file,read

I don't know much about SELinux, can you help me fix the label ?

How can I fix the label as described here?

If you want to fix the label.
/fedora.swap default label should be etc_runtime_t.

--

Regards,

Sreyan Chakravarty

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