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[v6,01/17] powerpc/powernv/vas: Release reference to tgid during window close

Message ID 6020fc4d444864fe20f7dcdc5edfe53e67480a1c.camel@linux.ibm.com
State Accepted
Commit 91cdbb955aa94ee0841af4685be40937345d29b8
Headers show
Series Enable VAS and NX-GZIP support on PowerVM | expand

Commit Message

Haren Myneni June 17, 2021, 8:29 p.m. UTC
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+
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Reported-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/platforms/powernv/vas-window.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
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Patch

diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c
index 5f5fe63a3d1c..7ba0840fc3b5 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);