Commit fdb2ecd3 authored by Benjamin Berg's avatar Benjamin Berg Committed by Johannes Berg
Browse files

um: Set parent death signal for winch thread/process 



The winch "thread" is really a separate process. Using prctl to set
PR_SET_PDEATHSIG ensures that this separate thread will be killed if the
UML kernel itself dies unexpectedly and does not perform proper cleanup.

Signed-off-by: default avatarBenjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20240919124511.282088-5-benjamin@sipsolutions.net


Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 801e00d3

arch/um/drivers/chan_user.c

+3 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <signal.h>

#include <termios.h>

#include <sys/ioctl.h>

#include <sys/prctl.h>

#include "chan_user.h"

#include <os.h>

#include <um_malloc.h>
@@ -161,6 +162,8 @@ static __noreturn int winch_thread(void *arg) 
	int count;

	char c = 1;



	prctl(PR_SET_PDEATHSIG, SIGKILL);



	pty_fd = data->pty_fd;

	pipe_fd = data->pipe_fd;

	count = write(pipe_fd, &c, sizeof(c));