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In setpgrp(), don't assume a pgrp won't exist if the provided pgid is the same

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as the target process' pid, it may exist if the process forked before leaving
the pgrp.
Thix fixes a panic that happens when calling setpgid to make a process
re-enter the pgrp with the same pgid as its pid if the pgrp still exists.
This commit is contained in:
Olivier Houchard 2003-07-04 02:21:28 +00:00
parent c97325b0c8
commit a10d5f02c8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=117214
1 changed files with 14 additions and 13 deletions
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27
sys/kern/kern_prot.c
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@ -436,24 +436,25 @@ setpgid(struct thread *td, register struct setpgid_args *uap)
}
if (uap->pgid == 0)
uap->pgid = targp->p_pid;
if (uap->pgid == targp->p_pid) {
if (targp->p_pgid == uap->pgid)
goto done;
error = enterpgrp(targp, uap->pgid, newpgrp, NULL);
if (error == 0)
newpgrp = NULL;
} else {
if ((pgrp = pgfind(uap->pgid)) == NULL ||
pgrp->pg_session != curp->p_session) {
if (pgrp != NULL)
PGRP_UNLOCK(pgrp);
if ((pgrp = pgfind(uap->pgid)) == NULL) {
if (uap->pgid == targp->p_pid) {
error = enterpgrp(targp, uap->pgid, newpgrp,
NULL);
if (error == 0)
newpgrp = NULL;
} else
error = EPERM;
goto done;
}
} else {
if (pgrp == targp->p_pgrp) {
PGRP_UNLOCK(pgrp);
goto done;
}
if (pgrp->pg_id != targp->p_pid &&
pgrp->pg_session != curp->p_session) {
PGRP_UNLOCK(pgrp);
error = EPERM;
goto done;
}
PGRP_UNLOCK(pgrp);
error = enterthispgrp(targp, pgrp);
}