From: Haren Myneni Date: Thu, 17 Jun 2021 20:29:05 +0000 (-0700) Subject: powerpc/powernv/vas: Release reference to tgid during window close X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=91cdbb955aa94ee0841af4685be40937345d29b8;p=linux.git powerpc/powernv/vas: Release reference to tgid during window close The kernel handles the NX fault by updating CSB or sending signal to process. In multithread applications, children can open VAS windows and can exit without closing them. But the parent can continue to send NX requests with these windows. To prevent pid reuse, reference will be taken on pid and tgid when the window is opened and release them during window close. The current code is not releasing the tgid reference which can cause pid leak and this patch fixes the issue. Fixes: db1c08a740635 ("powerpc/vas: Take reference to PID and mm for user space windows") Cc: stable@vger.kernel.org # 5.8+ Reported-by: Nicholas Piggin Signed-off-by: Haren Myneni Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/6020fc4d444864fe20f7dcdc5edfe53e67480a1c.camel@linux.ibm.com --- diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 5f5fe63a3d1ce..7ba0840fc3b55 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -1093,9 +1093,9 @@ struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop, /* * Process closes window during exit. In the case of * multithread application, the child thread can open - * window and can exit without closing it. Expects parent - * thread to use and close the window. So do not need - * to take pid reference for parent thread. + * window and can exit without closing it. so takes tgid + * reference until window closed to make sure tgid is not + * reused. */ txwin->tgid = find_get_pid(task_tgid_vnr(current)); /* @@ -1339,8 +1339,9 @@ int vas_win_close(struct vas_window *window) /* if send window, drop reference to matching receive window */ if (window->tx_win) { if (window->user_win) { - /* Drop references to pid and mm */ + /* Drop references to pid. tgid and mm */ put_pid(window->pid); + put_pid(window->tgid); if (window->mm) { mm_context_remove_vas_window(window->mm); mmdrop(window->mm);