um: Fix waitpid() usage in helper code

If UML is executing a helper program it is using
waitpid() with the __WCLONE flag to wait for the program
as the helper is executed from a clone()'ed thread.
While using __WCLONE is perfectly fine for clone()'ed
childs it won't detect terminated childs if the helper
has issued an execve().

We have to use __WALL to wait for both clone()'ed and
regular childs to detect the termination before and
after an execve().

Reported-and-tested-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Richard Weinberger <richard@nod.at>

diff --git a/arch/um/os-Linux/helper.c b/arch/um/os-Linux/helper.c
index e3ee4a5..3f02d42 100644 (file)
--- a/arch/um/os-Linux/helper.c
+++ b/arch/um/os-Linux/helper.c
@@ -96,7 +96,7 @@ int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv)
                               "ret = %d\n", -n);
                        ret = n;
                }
-               CATCH_EINTR(waitpid(pid, NULL, __WCLONE));
+               CATCH_EINTR(waitpid(pid, NULL, __WALL));
        }
 
 out_free2:
@@ -129,7 +129,7 @@ int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
                return err;
        }
        if (stack_out == NULL) {
-               CATCH_EINTR(pid = waitpid(pid, &status, __WCLONE));
+               CATCH_EINTR(pid = waitpid(pid, &status, __WALL));
                if (pid < 0) {
                        err = -errno;
                        printk(UM_KERN_ERR "run_helper_thread - wait failed, "
@@ -148,7 +148,7 @@ int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
 int helper_wait(int pid)
 {
        int ret, status;
-       int wflags = __WCLONE;
+       int wflags = __WALL;
 
        CATCH_EINTR(ret = waitpid(pid, &status, wflags));
        if (ret < 0) {