um: Cleanup SIGTERM handling

Richard reported that some UML processes survive if the UML
main process receives a SIGTERM.
This issue was caused by a wrongly placed signal(SIGTERM, SIG_DFL)
in init_new_thread_signals().
It disabled the UML exit handler accidently for some processes.
The correct solution is to disable the fatal handler for all
UML helper threads/processes.
Such that last_ditch_exit() does not get called multiple times
and all processes can exit due to SIGTERM.

Reported-and-tested-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

8 files changed, 16 insertions, 12 deletions

diff --git a/arch/um/drivers/ubd.h b/arch/um/drivers/ubd.h
index 3845051f1b10..3b48cd2081ee 100644
--- a/arch/um/drivers/ubd.h
+++ b/arch/um/drivers/ubd.h
@@ -7,7 +7,6 @@
 #ifndef __UM_UBD_USER_H
 #define __UM_UBD_USER_H
 
-extern void ignore_sigwinch_sig(void);
 extern int start_io_thread(unsigned long sp, int *fds_out);
 extern int io_thread(void *arg);
 extern int kernel_fd;
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 1812bc81715b..3716e6952554 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1476,7 +1476,8 @@ int io_thread(void *arg)
         struct io_thread_req *req;
         int n;
 
-        ignore_sigwinch_sig();
+        os_fix_helper_signals();
+
         while(1){
                 n = os_read_file(kernel_fd, &req,
                                  sizeof(struct io_thread_req *));
diff --git a/arch/um/drivers/ubd_user.c b/arch/um/drivers/ubd_user.c
index a703e45d8aac..e376f9b9c68d 100644
--- a/arch/um/drivers/ubd_user.c
+++ b/arch/um/drivers/ubd_user.c
@@ -21,11 +21,6 @@
 #include "ubd.h"
 #include <os.h>
 
-void ignore_sigwinch_sig(void)
-{
-        signal(SIGWINCH, SIG_IGN);
-}
-
 int start_io_thread(unsigned long sp, int *fd_out)
 {
         int pid, fds[2], err;
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index e98303925cc5..021104d98cb3 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -235,6 +235,7 @@ extern void setup_machinename(char *machine_out);
 extern void setup_hostinfo(char *buf, int len);
 extern void os_dump_core(void) __attribute__ ((noreturn));
 extern void um_early_printk(const char *s, unsigned int n);
+extern void os_fix_helper_signals(void);
 
 /* time.c */
 extern void idle_sleep(unsigned long long nsecs);
diff --git a/arch/um/os-Linux/aio.c b/arch/um/os-Linux/aio.c
index 3a6bc2af0961..014eb35fd13b 100644
--- a/arch/um/os-Linux/aio.c
+++ b/arch/um/os-Linux/aio.c
@@ -104,8 +104,7 @@ static int aio_thread(void *arg)
         struct io_event event;
         int err, n, reply_fd;
 
-        signal(SIGWINCH, SIG_IGN);
-
+        os_fix_helper_signals();
         while (1) {
                 n = io_getevents(ctx, 1, 1, &event, NULL);
                 if (n < 0) {
@@ -173,7 +172,7 @@ static int not_aio_thread(void *arg)
         struct aio_thread_reply reply;
         int err;
 
-        signal(SIGWINCH, SIG_IGN);
+        os_fix_helper_signals();
         while (1) {
                 err = read(aio_req_fd_r, &req, sizeof(req));
                 if (err != sizeof(req)) {
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index 67b9c8f5a89e..33496fe2bb52 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -294,5 +294,4 @@ void init_new_thread_signals(void)
         signal(SIGHUP, SIG_IGN);
         set_handler(SIGIO);
         signal(SIGWINCH, SIG_IGN);
-        signal(SIGTERM, SIG_DFL);
 }
diff --git a/arch/um/os-Linux/sigio.c b/arch/um/os-Linux/sigio.c
index 8b61cc0e82c8..46e762f926eb 100644
--- a/arch/um/os-Linux/sigio.c
+++ b/arch/um/os-Linux/sigio.c
@@ -55,7 +55,7 @@ static int write_sigio_thread(void *unused)
         int i, n, respond_fd;
         char c;
 
-        signal(SIGWINCH, SIG_IGN);
+        os_fix_helper_signals();
         fds = &current_poll;
         while (1) {
                 n = poll(fds->poll, fds->used, -1);
diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
index 492ef5e6e166..faee55ef6d2f 100644
--- a/arch/um/os-Linux/util.c
+++ b/arch/um/os-Linux/util.c
@@ -94,6 +94,16 @@ static inline void __attribute__ ((noreturn)) uml_abort(void)
                         exit(127);
 }
 
+/*
+ * UML helper threads must not handle SIGWINCH/INT/TERM
+ */
+void os_fix_helper_signals(void)
+{
+        signal(SIGWINCH, SIG_IGN);
+        signal(SIGINT, SIG_DFL);
+        signal(SIGTERM, SIG_DFL);
+}
+
 void os_dump_core(void)
 {
         int pid;