linux-kernel - Device to write to all (serial) consoles

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <32c2d26f-ec4a-b9a6-b42c-07b27f99ea28@molgen.mpg.de>
Date:   Fri, 2 Aug 2019 15:23:08 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-serial@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Donald Buczek <buczek@...gen.mpg.de>
Subject: Device to write to all (serial) consoles

Dear Linux folks,

On a lot of devices, like servers, you have more than one serial console,
and you do not always know, how they are numbered. Therefore, we start a
console on ttyS0 and ttyS1.

In user space, we also would like to write to both consoles to not worry
about the numbering. Writing to `/dev/console` only write to the active
console.

    $ more /proc/consoles # I think
    tty0                 -WU (EC p  )    4:1
    ttyS0                -W- (E  p a)    4:65
    ttyS1                -W- (E  p a)    4:65

Does a device exist, or can a device be configured so you can write to
all (serial) consoles from user space?

Kind regards,

Paul

Download attachment "smime.p7s" of type "application/pkcs7-signature" (5174 bytes)