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18 lines
1.8 KiB
Markdown
18 lines
1.8 KiB
Markdown
### [CVE-2024-56719](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56719)
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### Description
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In the Linux kernel, the following vulnerability has been resolved:net: stmmac: fix TSO DMA API usage causing oopsCommit 66600fac7a98 ("net: stmmac: TSO: Fix unbalanced DMA map/unmapfor non-paged SKB data") moved the assignment of tx_skbuff_dma[]'smembers to be later in stmmac_tso_xmit().The buf (dma cookie) and len stored in this structure are passed todma_unmap_single() by stmmac_tx_clean(). The DMA API requires thatthe dma cookie passed to dma_unmap_single() is the same as the valuereturned from dma_map_single(). However, by moving the assignmentlater, this is not the case when priv->dma_cap.addr64 > 32 as "des"is offset by proto_hdr_len.This causes problems such as: dwc-eth-dwmac 2490000.ethernet eth0: Tx DMA map failedand with DMA_API_DEBUG enabled: DMA-API: dwc-eth-dwmac 2490000.ethernet: device driver tries to +free DMA memory it has not allocated [device address=0x000000ffffcf65c0] [size=66 bytes]Fix this by maintaining "des" as the original DMA cookie, and usetso_des to pass the offset DMA cookie to stmmac_tso_allocator().Full details of the crashes can be found at:https://lore.kernel.org/all/d8112193-0386-4e14-b516-37c2d838171a@nvidia.com/https://lore.kernel.org/all/klkzp5yn5kq5efgtrow6wbvnc46bcqfxs65nz3qy77ujr5turc@bwwhelz2l4dw/
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### POC
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#### Reference
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No PoCs from references.
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#### Github
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- https://github.com/cku-heise/euvd-api-doc
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