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kern: fix working dir after ns clone 

After sending the "clone" request to /proc/$pid/ns, the current process
will be moved to the working directory of $pid.

Otherwise the current process could still access the file and folders
on the service providing its dot, even if such service was not visible to $pid.

Also, keeping the original working directory means that the 'cd' line of the
current process's ns file would be different from that of $pid: the two ns
files must match since the command asked for a "clone".

See also https://marc.info/?l=9fans&m=150893734909969&w=2
This commit is contained in:
Giacomo Tesio 2017-10-25 01:59:04 +02:00
parent 2836ae4d66
commit 26bd1d8dc4
1 changed files with 5 additions and 0 deletions
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5
sys/src/kern/port/devproc.c
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@ -1281,6 +1281,11 @@ procwrite(Chan *c, void *va, long n, int64_t off)
pgrpcpy(up->pgrp, p->pgrp); pgrpcpy(up->pgrp, p->pgrp);
/* inherit noattach */ /* inherit noattach */
up->pgrp->noattach = p->pgrp->noattach; up->pgrp->noattach = p->pgrp->noattach;
/* inherit dot */
if(up->dot != nil)
cclose(up->dot);
up->dot = p->dot;
incref(&up->dot->r);
closepgrp(opg); closepgrp(opg);
break; break;