From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Daniel Vetter <daniel.vetter@intel.com>,
Sumit Semwal <sumit.semwal@linaro.org>,
Chenbo Feng <fengc@google.com>,
Greg Hackmann <ghackmann@google.com>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org,
minchan@kernel.org, surenb@google.com, jenhaochen@google.com,
Martin Liu <liumartin@google.com>,
Sasha Levin <sashal@kernel.org>,
dri-devel@lists.freedesktop.org
Subject: [PATCH AUTOSEL 5.6 25/50] dma-buf: Fix SET_NAME ioctl uapi
Date: Thu, 7 May 2020 10:27:01 -0400 [thread overview]
Message-ID: <20200507142726.25751-25-sashal@kernel.org> (raw)
In-Reply-To: <20200507142726.25751-1-sashal@kernel.org>
From: Daniel Vetter <daniel.vetter@intel.com>
[ Upstream commit a5bff92eaac45bdf6221badf9505c26792fdf99e ]
The uapi is the same on 32 and 64 bit, but the number isn't. Everyone
who botched this please re-read:
https://www.kernel.org/doc/html/v5.4-preprc-cpu/ioctl/botching-up-ioctls.html
Also, the type argument for the ioctl macros is for the type the void
__user *arg pointer points at, which in this case would be the
variable-sized char[] of a 0 terminated string. So this was botched in
more than just the usual ways.
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Chenbo Feng <fengc@google.com>
Cc: Greg Hackmann <ghackmann@google.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Cc: minchan@kernel.org
Cc: surenb@google.com
Cc: jenhaochen@google.com
Cc: Martin Liu <liumartin@google.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Tested-by: Martin Liu <liumartin@google.com>
Reviewed-by: Martin Liu <liumartin@google.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
[sumits: updated some checkpatch fixes, corrected author email]
Link: https://patchwork.freedesktop.org/patch/msgid/20200407133002.3486387-1-daniel.vetter@ffwll.ch
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/dma-buf/dma-buf.c | 3 ++-
include/uapi/linux/dma-buf.h | 6 ++++++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index c343c7c10b4cc..e7589d91de8fb 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -388,7 +388,8 @@ static long dma_buf_ioctl(struct file *file,
return ret;
- case DMA_BUF_SET_NAME:
+ case DMA_BUF_SET_NAME_A:
+ case DMA_BUF_SET_NAME_B:
return dma_buf_set_name(dmabuf, (const char __user *)arg);
default:
diff --git a/include/uapi/linux/dma-buf.h b/include/uapi/linux/dma-buf.h
index dbc7092e04b5a..7f30393b92c3b 100644
--- a/include/uapi/linux/dma-buf.h
+++ b/include/uapi/linux/dma-buf.h
@@ -39,6 +39,12 @@ struct dma_buf_sync {
#define DMA_BUF_BASE 'b'
#define DMA_BUF_IOCTL_SYNC _IOW(DMA_BUF_BASE, 0, struct dma_buf_sync)
+
+/* 32/64bitness of this uapi was botched in android, there's no difference
+ * between them in actual uapi, they're just different numbers.
+ */
#define DMA_BUF_SET_NAME _IOW(DMA_BUF_BASE, 1, const char *)
+#define DMA_BUF_SET_NAME_A _IOW(DMA_BUF_BASE, 1, u32)
+#define DMA_BUF_SET_NAME_B _IOW(DMA_BUF_BASE, 1, u64)
#endif
--
2.20.1
parent reply other threads:[~2020-05-07 14:37 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20200507142726.25751-1-sashal@kernel.org>]
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