From 4c71ec00c2ea5c6acc75e436bf6d24e6861cb66f Mon Sep 17 00:00:00 2001 From: Elias Naur Date: Fri, 5 May 2023 10:18:43 -0600 Subject: libcamera: v4l2_videodevice: Use O_CLOEXEC when exporting DMA buffers Files opened internally in libcamera without the O_CLOEXEC file will remain open upon a call to one of the exec(3) functions. As exec() doesn't destroy local or global objects, this can lead to various side effects. Avoid this by opening file descriptors with O_CLOEXEC for all internal files. The O_CLOEXEC flag should also be set when obtaining file handles from the V4L2 VIDIOC_EXPBUF operation, but was missed during the updates to both d942bdc913c5 ("libcamera: v4l2_device: openat(2) with O_CLOEXEC to cleanup after exec(3)") and 436b38fd89fe ("libcamera: Open files with O_CLOEXEC"). Set the O_CLOEXEC flag on calls to ioctl(VIDIOC_EXPBUF). Fixes: 436b38fd89fe ("libcamera: Open files with O_CLOEXEC") Signed-off-by: Elias Naur Reviewed-by: Kieran Bingham Reviewed-by: Laurent Pinchart Signed-off-by: Laurent Pinchart --- src/libcamera/v4l2_videodevice.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src') diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp index 1051997e..a72ef64d 100644 --- a/src/libcamera/v4l2_videodevice.cpp +++ b/src/libcamera/v4l2_videodevice.cpp @@ -1471,7 +1471,7 @@ UniqueFD V4L2VideoDevice::exportDmabufFd(unsigned int index, expbuf.type = bufferType_; expbuf.index = index; expbuf.plane = plane; - expbuf.flags = O_RDWR; + expbuf.flags = O_CLOEXEC | O_RDWR; ret = ioctl(VIDIOC_EXPBUF, &expbuf); if (ret < 0) { -- cgit v1.2.1