ghsa-8pr8-xc5p-c8gp
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
media: qcom: camss: Remove use_count guard in stop_streaming
The use_count check was introduced so that multiple concurrent Raw Data Interfaces RDIs could be driven by different virtual channels VCs on the CSIPHY input driving the video pipeline.
This is an invalid use of use_count though as use_count pertains to the number of times a video entity has been opened by user-space not the number of active streams.
If use_count and stream-on count don't agree then stop_streaming() will break as is currently the case and has become apparent when using CAMSS with libcamera's released softisp 0.3.
The use of use_count like this is a bit hacky and right now breaks regular usage of CAMSS for a single stream case. Stopping qcam results in the splat below, and then it cannot be started again and any attempts to do so fails with -EBUSY.
[ 1265.509831] WARNING: CPU: 5 PID: 919 at drivers/media/common/videobuf2/videobuf2-core.c:2183 __vb2_queue_cancel+0x230/0x2c8 [videobuf2_common] ... [ 1265.510630] Call trace: [ 1265.510636] __vb2_queue_cancel+0x230/0x2c8 [videobuf2_common] [ 1265.510648] vb2_core_streamoff+0x24/0xcc [videobuf2_common] [ 1265.510660] vb2_ioctl_streamoff+0x5c/0xa8 [videobuf2_v4l2] [ 1265.510673] v4l_streamoff+0x24/0x30 [videodev] [ 1265.510707] __video_do_ioctl+0x190/0x3f4 [videodev] [ 1265.510732] video_usercopy+0x304/0x8c4 [videodev] [ 1265.510757] video_ioctl2+0x18/0x34 [videodev] [ 1265.510782] v4l2_ioctl+0x40/0x60 [videodev] ... [ 1265.510944] videobuf2_common: driver bug: stop_streaming operation is leaving buffer 0 in active state [ 1265.511175] videobuf2_common: driver bug: stop_streaming operation is leaving buffer 1 in active state [ 1265.511398] videobuf2_common: driver bug: stop_streaming operation is leaving buffer 2 in active st
One CAMSS specific way to handle multiple VCs on the same RDI might be:
- Reference count each pipeline enable for CSIPHY, CSID, VFE and RDIx.
- The video buffers are already associated with msm_vfeN_rdiX so release video buffers when told to do so by stop_streaming.
- Only release the power-domains for the CSIPHY, CSID and VFE when their internal refcounts drop.
Either way refusing to release video buffers based on use_count is erroneous and should be reverted. The silicon enabling code for selecting VCs is perfectly fine. Its a "known missing feature" that concurrent VCs won't work with CAMSS right now.
Initial testing with this code didn't show an error but, SoftISP and "real" usage with Google Hangouts breaks the upstream code pretty quickly, we need to do a partial revert and take another pass at VCs.
This commit partially reverts commit 89013969e232 ("media: camss: sm8250: Pipeline starting and stopping for multiple virtual channels")
{
"affected": [],
"aliases": [
"CVE-2024-50175"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-11-08T06:15:14Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: qcom: camss: Remove use_count guard in stop_streaming\n\nThe use_count check was introduced so that multiple concurrent Raw Data\nInterfaces RDIs could be driven by different virtual channels VCs on the\nCSIPHY input driving the video pipeline.\n\nThis is an invalid use of use_count though as use_count pertains to the\nnumber of times a video entity has been opened by user-space not the number\nof active streams.\n\nIf use_count and stream-on count don\u0027t agree then stop_streaming() will\nbreak as is currently the case and has become apparent when using CAMSS\nwith libcamera\u0027s released softisp 0.3.\n\nThe use of use_count like this is a bit hacky and right now breaks regular\nusage of CAMSS for a single stream case. Stopping qcam results in the splat\nbelow, and then it cannot be started again and any attempts to do so fails\nwith -EBUSY.\n\n[ 1265.509831] WARNING: CPU: 5 PID: 919 at drivers/media/common/videobuf2/videobuf2-core.c:2183 __vb2_queue_cancel+0x230/0x2c8 [videobuf2_common]\n...\n[ 1265.510630] Call trace:\n[ 1265.510636] __vb2_queue_cancel+0x230/0x2c8 [videobuf2_common]\n[ 1265.510648] vb2_core_streamoff+0x24/0xcc [videobuf2_common]\n[ 1265.510660] vb2_ioctl_streamoff+0x5c/0xa8 [videobuf2_v4l2]\n[ 1265.510673] v4l_streamoff+0x24/0x30 [videodev]\n[ 1265.510707] __video_do_ioctl+0x190/0x3f4 [videodev]\n[ 1265.510732] video_usercopy+0x304/0x8c4 [videodev]\n[ 1265.510757] video_ioctl2+0x18/0x34 [videodev]\n[ 1265.510782] v4l2_ioctl+0x40/0x60 [videodev]\n...\n[ 1265.510944] videobuf2_common: driver bug: stop_streaming operation is leaving buffer 0 in active state\n[ 1265.511175] videobuf2_common: driver bug: stop_streaming operation is leaving buffer 1 in active state\n[ 1265.511398] videobuf2_common: driver bug: stop_streaming operation is leaving buffer 2 in active st\n\nOne CAMSS specific way to handle multiple VCs on the same RDI might be:\n\n- Reference count each pipeline enable for CSIPHY, CSID, VFE and RDIx.\n- The video buffers are already associated with msm_vfeN_rdiX so\n release video buffers when told to do so by stop_streaming.\n- Only release the power-domains for the CSIPHY, CSID and VFE when\n their internal refcounts drop.\n\nEither way refusing to release video buffers based on use_count is\nerroneous and should be reverted. The silicon enabling code for selecting\nVCs is perfectly fine. Its a \"known missing feature\" that concurrent VCs\nwon\u0027t work with CAMSS right now.\n\nInitial testing with this code didn\u0027t show an error but, SoftISP and \"real\"\nusage with Google Hangouts breaks the upstream code pretty quickly, we need\nto do a partial revert and take another pass at VCs.\n\nThis commit partially reverts commit 89013969e232 (\"media: camss: sm8250:\nPipeline starting and stopping for multiple virtual channels\")",
"id": "GHSA-8pr8-xc5p-c8gp",
"modified": "2024-11-08T06:30:48Z",
"published": "2024-11-08T06:30:48Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50175"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/25f18cb1b673220b76a86ebef8e7fb79bd303b27"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a975db8aea152f9907aa53a7f517e557ccb40da3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c2218a82f795dc3d0b6210bcaa3d9c5ca736fcd9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d7d4dde3decef1b5aa1f5c390147f79aae412dee"
}
],
"schema_version": "1.4.0",
"severity": []
}
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