6.12-stable review patch. If anyone has any objections, please let me know.
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From: Jann Horn jannh@google.com
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 vivek.kasireddy@intel.com Signed-off-by: Jann Horn jannh@google.com Reviewed-by: Joel Fernandes (Google) joel@joelfernandes.org Signed-off-by: Vivek Kasireddy vivek.kasireddy@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20241204-udmabuf-fixes-v2-2-23... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/dma-buf/udmabuf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -256,7 +256,7 @@ static const struct dma_buf_ops udmabuf_ };
#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) {