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pipe: fix POLLHUP handling if no events were specified

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Linux allows polling without any events specified and it happens to be the case
in FreeBSD as well. POLLHUP has to be delivered regardless of the event mask
and this works fine if the condition is already present. However, if it is
missing, selrecord is only called if the eventmask has relevant bits set. This
in particular leads to a conditon where pipe_poll can return 0 events and
neglect to selrecord, while kern_poll takes it as an indication it has to go to
sleep, but then there is nobody to wake it up.

While the problem seems systemic to *_poll handlers the least we can do is fix
it up for pipes.

Reported by:	Jeremie Galarneau <jeremie.galarneau at efficios.com>
Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D27094
This commit is contained in:
Mateusz Guzik 2020-11-04 23:11:54 +00:00
parent 8f02e2ac27
commit c22ba7bb06
1 changed files with 6 additions and 2 deletions
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8
sys/kern/sys_pipe.c
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@ -1458,13 +1458,17 @@ pipe_poll(struct file *fp, int events, struct ucred *active_cred,
}
if (revents == 0) {
if (fp->f_flag & FREAD && events & (POLLIN | POLLRDNORM)) {
/*
* Add ourselves regardless of eventmask as we have to return
* POLLHUP even if it was not asked for.
*/
if ((fp->f_flag & FREAD) != 0) {
selrecord(td, &rpipe->pipe_sel);
if (SEL_WAITING(&rpipe->pipe_sel))
rpipe->pipe_state |= PIPE_SEL;
}
if (fp->f_flag & FWRITE && events & (POLLOUT | POLLWRNORM)) {
if ((fp->f_flag & FWRITE)!= 0) {
selrecord(td, &wpipe->pipe_sel);
if (SEL_WAITING(&wpipe->pipe_sel))
wpipe->pipe_state |= PIPE_SEL;