linux-kernel - [PATCH v2 2/3] udmabuf: also check for F_SEAL_FUTURE

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Message-Id: <20241204-udmabuf-fixes-v2-2-23887289de1c@google.com>
Date: Wed, 04 Dec 2024 17:26:20 +0100
From: Jann Horn <jannh@...gle.com>
To: Gerd Hoffmann <kraxel@...hat.com>, 
 Vivek Kasireddy <vivek.kasireddy@...el.com>, 
 Sumit Semwal <sumit.semwal@...aro.org>, 
 Christian König <christian.koenig@....com>, 
 Simona Vetter <simona.vetter@...ll.ch>, John Stultz <jstultz@...gle.com>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc: dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org, 
 linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org, 
 Jann Horn <jannh@...gle.com>, stable@...r.kernel.org
Subject: [PATCH v2 2/3] udmabuf: also check for F_SEAL_FUTURE_WRITE

When F_SEAL_FUTURE_WRITE was introduced, it was overlooked that udmabuf
must reject memfds with this flag, just like ones with F_SEAL_WRITE.
Fix it by adding F_SEAL_FUTURE_WRITE to SEALS_DENIED.

Fixes: ab3948f58ff8 ("mm/memfd: add an F_SEAL_FUTURE_WRITE seal to memfd")
Cc: stable@...r.kernel.org
Acked-by: Vivek Kasireddy <vivek.kasireddy@...el.com>
Signed-off-by: Jann Horn <jannh@...gle.com>
---
 drivers/dma-buf/udmabuf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index c1d8c2766d6d36fc5fe1b3d73057f6e01ec6678f..b330b99fcc7619a05bb7dc2aeeb9c82faf9a387b 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -297,7 +297,7 @@ static const struct dma_buf_ops udmabuf_ops = {
 };
 
 #define SEALS_WANTED (F_SEAL_SHRINK)
-#define SEALS_DENIED (F_SEAL_WRITE)
+#define SEALS_DENIED (F_SEAL_WRITE|F_SEAL_FUTURE_WRITE)
 
 static int check_memfd_seals(struct file *memfd)
 {

-- 
2.47.0.338.g60cca15819-goog