Re: [Bug 273566] stray characters contaminate serial console
Date: Thu, 09 Jan 2025 17:53:52 UTC
On Thu, Jan 09, 2025 at 12:36:42PM +0000, bugzilla-noreply@freebsd.org wrote: > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273566 > > --- Comment #6 from Sulev-Madis Silber <bugs-freebsd-org916@ketas.si.pri.ee> --- > i messed with things on purpose to see if they break and they did > > ftdi isolates usb ttl adapter is connected with usb end at 13.4 on amd64 and > serial end at current on armv7 > > login via serial using cu, to the armv7 board, then kill cu > > then, with ssh i execute: > > sh -c 'while :; do : | wall; done' > > on said armv7 device > > let some time pass and run cu on port again > > this is what shell history has: > > 41 14:20 Broadcast Message from root@ask-m-001 ^G^G > 42 14:20 ( /dev/pts/0 ) at 14:19 EET... > ^@BBBBBBBBBBBBBJBBBBBBgBBBB^_BBBBBBBB > BBJBBBBBBFBBBBBBwBBBB^_BBBBBBBBBBJBBBBBBFBBBBBBgB^@ > 43 14:20 h > 14:20,root@ask-m-001:~# > > is this what you experience? In short, yes, the usb end is on armv7, the serial end is arm64 : bob@nemesis:~ % Broadcast Message from bob@nemesis.zefox.com ^G^G Broadcast: Command not found. bob@nemesis:~ % bob@nemesis:~ % bob@nemesis:~ % bob@nemesis:~ % bob@nemesis:~ % bob@nemesis:~ % (/dev/pts/1) at KBBBFBBBBBBBBBBBBBBBBBBBBgëB×BBBBBBBBBBBBBBNBBBBBBfgëB×BBBBBBBBBBBBBBNBBBBB^@ Badly placed ()'s. I did this by dropping the cu connection to arm64 using ~~., using your wall command briefly, killing it with control-c and then picking up the serial connection. Recalling history on the serial (arm64) end I see 999 7:13 su 1000 19:41 exit 1001 9:17 h 1002 9:19 Broadcast Message from bob@nemesis.zefox.com ^G^G 1003 9:21 ( /dev/pts/1 ) at KBBBFBBBBBBBBBBBBBBBBBBBBgëB×BBBBBBBBBBBBBBNBBBBBBfgëB×BBBBBBBBBBBBBBNBBBBB^@ 1004 9:25 h bob@nemesis:~ % It appears that only one instance of "leakage" into the serial-end command history occurs through the duration of the wall transmissiion. Thanks for writing! bob prohaska