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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: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20240919124511.282088-5-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Benjamin Berg 2024-09-19 14:45:05 +02:00 committed by Johannes Berg
parent 801e00d3a1
commit fdb2ecd35d
1 changed files with 3 additions and 0 deletions
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3
arch/um/drivers/chan_user.c
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@ -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));