* bug#50193: guix: shepherd pid 1 holds /dev/console
@ 2021-08-24 18:37 muradm
0 siblings, 0 replies; only message in thread
From: muradm @ 2021-08-24 18:37 UTC (permalink / raw)
To: 50193
On IRC chat we identified an issue related to linux SAK, which
is explained here
https://www.kernel.org/doc/html/latest/security/sak.html
Following the check what processes will be SAK'ed:
~# ls -l /proc/[0-9]*/fd/* | grep console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/1/fd/1 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/1/fd/2 ->
/dev/console
l-wx------ 1 root root 64 Aug 24 21:22 /proc/578/fd/4 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/593/fd/1 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/593/fd/2 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 20:03 /proc/705/fd/1 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 20:03 /proc/705/fd/2 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/909/fd/1 ->
/dev/console
lrwx------ 1 root root 64 Aug 24 21:22 /proc/909/fd/2 ->
/dev/console
As it is seen from above output, pid 1 which is shepherd holds
/dev/console
making linux SAK feature useless. When SAK command issued by
shortcut keys,
all above proceses gets killed including pid 1 which is shepherd,
causing
system to stall.
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2021-08-24 18:37 bug#50193: guix: shepherd pid 1 holds /dev/console muradm
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