Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue() Add proper locking in mmp_pdma_residue() to prevent use-after-free when accessing descriptor list and descriptor contents. The race occurs when multiple threads call tx_status() while the tasklet on another CPU is freeing completed descriptors: CPU 0 CPU 1 ----- ----- mmp_pdma_tx_status() mmp_pdma_residue() -> NO LOCK held list_for_each_entry(sw, ..) DMA interrupt dma_do_tasklet() -> spin_lock(&desc_lock) list_move(sw->node, ...) spin_unlock(&desc_lock) | dma_pool_free(sw) <- FREED! -> access sw->desc <- UAF! This issue can be reproduced when running dmatest on the same channel with multiple threads (threads_per_chan > 1). Fix by protecting the chain_running list iteration and descriptor access with the chan->desc_lock spinlock.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1b38da264674d6a0fe26a63996b8f88b88c3da48 to < 3f0e0e2d9e752570041e95fd04635e2580097819affected1b38da264674d6a0fe26a63996b8f88b88c3da48 to < dfb5e05227745de43b7fd589721817a4337c970daffected1b38da264674d6a0fe26a63996b8f88b88c3da48 to < eba0c75670c022cb1f948600db972524bcfe8166affected1b38da264674d6a0fe26a63996b8f88b88c3da48 to < fc023b8fab057f0c910856ff36d3e12a30b7af4aaffected1b38da264674d6a0fe26a63996b8f88b88c3da48 to < 9f665b3c3d9a168410251f27a5d019b7bf93185caffected1b38da264674d6a0fe26a63996b8f88b88c3da48 to < a143545855bc2c6e1330f6f57ae375ac44af00a7affected
Linux Linux
Default version status: affected
3.16affected0 to < 3.16unaffected5.15.209 to ≤ 5.15.*unaffected6.1.167 to ≤ 6.1.*unaffected6.6.130 to ≤ 6.6.*unaffected6.12.78 to ≤ 6.12.*unaffected6.18.10 to ≤ 6.18.*unaffected6.19 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/3f0e0e2d9e752570041e95fd04635e2580097819 ↗
- https://git.kernel.org/stable/c/dfb5e05227745de43b7fd589721817a4337c970d ↗
- https://git.kernel.org/stable/c/eba0c75670c022cb1f948600db972524bcfe8166 ↗
- https://git.kernel.org/stable/c/fc023b8fab057f0c910856ff36d3e12a30b7af4a ↗
- https://git.kernel.org/stable/c/9f665b3c3d9a168410251f27a5d019b7bf93185c ↗
- https://git.kernel.org/stable/c/a143545855bc2c6e1330f6f57ae375ac44af00a7 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗