CVE-2022-50145: In the Linux kernel, the following vulnerability has been resolved: dmaengine: sf-pdma: Add multithread support for a DMA channel When we get a DMA channel and…

PriorityP421medium5.5CVSS 3.1

AVLACLPRLUINSUCNINAH

EPSS

0.17%

6.4th percentile

In the Linux kernel, the following vulnerability has been resolved: dmaengine: sf-pdma: Add multithread support for a DMA channel When we get a DMA channel and try to use it in multiple threads it will cause oops and hanging the system. % echo 64 > /sys/module/dmatest/parameters/threads_per_chan % echo 10000 > /sys/module/dmatest/parameters/iterations % echo 1 > /sys/module/dmatest/parameters/run [ 89.480664] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a0 [ 89.488725] Oops [#1] [ 89.494708] CPU: 2 PID: 1008 Comm: dma0chan0-copy0 Not tainted 5.17.0-rc5 [ 89.509385] epc : vchan_find_desc+0x32/0x46 [ 89.513553] ra : sf_pdma_tx_status+0xca/0xd6 This happens because of data race. Each thread rewrite channels's descriptor as soon as device_prep_dma_memcpy() is called. It leads to the situation when the driver thinks that it uses right descriptor that actually is freed or substituted for other one. With current fixes a descriptor changes its value only when it has been used. A new descriptor is acquired from vc->desc_issued queue that is already filled with descriptors that are ready to be sent. Threads have no direct access to DMA channel descriptor. Now it is just possible to queue a descriptor for further processing.

Affected

15 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.0.2-1 (bookworm)	linux 6.0.2-1 (bookworm)
linux	linux	—	—
linux	linux	>= 6973886ad58e6b4988813331abb76ae0b364a9c2 < b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11	b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11
linux	linux	>= 6973886ad58e6b4988813331abb76ae0b364a9c2 < 5ab2782c944e324008ef5d658f2494a9f0e3c5ac	5ab2782c944e324008ef5d658f2494a9f0e3c5ac
linux	linux	>= 6973886ad58e6b4988813331abb76ae0b364a9c2 < 4c7350b1dd8a192af844de32fc99b9e34c876fda	4c7350b1dd8a192af844de32fc99b9e34c876fda
linux	linux	>= 6973886ad58e6b4988813331abb76ae0b364a9c2 < a93b3f1e11971a91b6441b6d47488f4492cc113f	a93b3f1e11971a91b6441b6d47488f4492cc113f
linux	linux	>= 6973886ad58e6b4988813331abb76ae0b364a9c2 < b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc	b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc
linux	linux_kernel	>= 0 < 5.10.140-1	5.10.140-1
linux	linux_kernel	>= 0 < 6.0.2-1	6.0.2-1
linux	linux_kernel	>= 0 < 6.0.2-1	6.0.2-1
linux	linux_kernel	>= 0 < 6.0.2-1	6.0.2-1
linux	linux_kernel	>= 5.11 < 5.15.61	5.15.61
linux	linux_kernel	>= 5.16 < 5.18.18	5.18.18
linux	linux_kernel	>= 5.19 < 5.19.2	5.19.2
linux	linux_kernel	>= 5.5 < 5.10.137	5.10.137

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv5.5MEDIUM

vendor_debian5.5MEDIUM

vendor_redhat5.5MEDIUM

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