cve-2024-44950
Vulnerability from cvelistv5
Published
2024-09-04 18:35
Modified
2024-12-19 09:18
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: serial: sc16is7xx: fix invalid FIFO access with special register set When enabling access to the special register set, Receiver time-out and RHR interrupts can happen. In this case, the IRQ handler will try to read from the FIFO thru the RHR register at address 0x00, but address 0x00 is mapped to DLL register, resulting in erroneous FIFO reading. Call graph example: sc16is7xx_startup(): entry sc16is7xx_ms_proc(): entry sc16is7xx_set_termios(): entry sc16is7xx_set_baud(): DLH/DLL = $009C --> access special register set sc16is7xx_port_irq() entry --> IIR is 0x0C sc16is7xx_handle_rx() entry sc16is7xx_fifo_read(): --> unable to access FIFO (RHR) because it is mapped to DLL (LCR=LCR_CONF_MODE_A) sc16is7xx_set_baud(): exit --> Restore access to general register set Fix the problem by claiming the efr_lock mutex when accessing the Special register set.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6a6730812220a9a5ce4003eb347da1ee5abd06b0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d3b793faaab1305994ce568b59d61927235f57bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cc6a3f35bc9b3a8da1b195420a2e8d9fdadfa831
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc5ead0e8fc5ef53b8553394d4aab60c277976b3
Impacted products
Vendor Product Version
Linux Linux Version: dfeae619d781dee61666d5551b93ba3be755a86b
Version: dfeae619d781dee61666d5551b93ba3be755a86b
Version: dfeae619d781dee61666d5551b93ba3be755a86b
Version: dfeae619d781dee61666d5551b93ba3be755a86b
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      dateReserved: "2024-08-21T05:34:56.665Z",
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}


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