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CVE-2024-26807
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MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
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Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
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Description
In the Linux kernel, the following vulnerability has been resolved:
Both cadence-quadspi –>runtime_suspend() and –>runtime_resume()
implementations start with:
struct cqspi_st *cqspi = dev_get_drvdata(dev); struct spi_controller *host = dev_get_drvdata(dev);
This obviously cannot be correct, unless “struct cqspi_st” is the
first member of “ struct spi_controller”, or the other way around, but
it is not the case. “struct spi_controller” is allocated by
devm_spi_alloc_host(), which allocates an extra amount of memory for
private data, used to store “struct cqspi_st”.
The –>probe() function of the cadence-quadspi driver then sets the
device drvdata to store the address of the “struct cqspi_st”
structure. Therefore:
struct cqspi_st *cqspi = dev_get_drvdata(dev);
is correct, but:
struct spi_controller *host = dev_get_drvdata(dev);
is not, as it makes “host” point not to a “struct spi_controller” but
to the same “struct cqspi_st” structure as above.
This obviously leads to bad things (memory corruption, kernel crashes)
directly during –>probe(), as –>probe() enables the device using PM
runtime, leading the –>runtime_resume() hook being called, which in
turns calls spi_controller_resume() with the wrong pointer.
This has at least been reported [0] to cause a kernel crash, but the
exact behavior will depend on the memory contents.
[0] https://lore.kernel.org/all/20240226121803.5a7r5wkpbbowcxgx@dhruva/
This issue potentially affects all platforms that are currently using
the cadence-quadspi driver.
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