From cb70f37c103d9189daf22aadf2925c11e8aa78db Mon Sep 17 00:00:00 2001 From: Jann Horn Date: Wed, 4 Dec 2024 17:26:20 +0100 Subject: [PATCH] udmabuf: also check for F_SEAL_FUTURE_WRITE commit 0a16e24e34f28210f68195259456c73462518597 upstream. 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@vger.kernel.org Acked-by: Vivek Kasireddy Signed-off-by: Jann Horn Reviewed-by: Joel Fernandes (Google) Signed-off-by: Vivek Kasireddy Link: https://patchwork.freedesktop.org/patch/msgid/20241204-udmabuf-fixes-v2-2-23887289de1c@google.com Signed-off-by: Greg Kroah-Hartman --- 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 80ccdf96093f..ae42e98cf835 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -120,7 +120,7 @@ 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 long udmabuf_create(const struct udmabuf_create_list *head, const struct udmabuf_create_item *list)