[PATCH 6.12 003/337] um: Set parent death signal for winch thread/process
Greg Kroah-Hartman <[email protected]>
| Newsgroups | dev.linux.lists.patches,org.kernel.vger.stable |
|---|---|
| Message-ID | <[email protected]> |
6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Benjamin Berg <[email protected]> commit fdb2ecd35d327a1fc6bba69b97f85b494e1f4b6b upstream. 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 <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Johannes Berg <[email protected]> Signed-off-by: Florian Fainelli <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- arch/um/drivers/chan_user.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c index a66e556012c4..1434114b2f34 100644 --- a/arch/um/drivers/chan_user.c +++ b/arch/um/drivers/chan_user.c @@ -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)); -- 2.53.0