The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=7326e8589cc21431d62f25802eac7c5dd6f74122
commit 7326e8589cc21431d62f25802eac7c5dd6f74122 Author: Mark Johnston <[email protected]> AuthorDate: 2021-08-28 19:50:44 +0000 Commit: Mark Johnston <[email protected]> CommitDate: 2021-08-28 19:50:44 +0000 fsetown: Avoid process group lock recursion Restore the pre-1d874ba4f8ba behaviour of disassociating the current SIGIO recipient before looking up the specified process or process group. This avoids a lock recursion in the scenario where a process group is configured to receive SIGIO for an fd when it has already been so configured. Reported by: pho Tested by: pho Reviewed by: kib MFC after: 3 days --- sys/kern/kern_descrip.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c index f78e999ab3b5..ed7fe83cf02f 100644 --- a/sys/kern/kern_descrip.c +++ b/sys/kern/kern_descrip.c @@ -1158,14 +1158,12 @@ fsetown(pid_t pgid, struct sigio **sigiop) sigio->sio_ucred = crhold(curthread->td_ucred); sigio->sio_myref = sigiop; - osigio = NULL; ret = 0; if (pgid > 0) { ret = pget(pgid, PGET_NOTWEXIT | PGET_NOTID | PGET_HOLD, &proc); SIGIO_LOCK(); + osigio = funsetown_locked(*sigiop); if (ret == 0) { - osigio = funsetown_locked(*sigiop); - PROC_LOCK(proc); _PRELE(proc); if ((proc->p_flag & P_WEXIT) != 0) { @@ -1191,12 +1189,11 @@ fsetown(pid_t pgid, struct sigio **sigiop) } else /* if (pgid < 0) */ { sx_slock(&proctree_lock); SIGIO_LOCK(); + osigio = funsetown_locked(*sigiop); pgrp = pgfind(-pgid); if (pgrp == NULL) { ret = ESRCH; } else { - osigio = funsetown_locked(*sigiop); - if (pgrp->pg_session != curthread->td_proc->p_session) { /* * Policy - Don't allow a process to FSETOWN a _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "[email protected]"
