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Change History

In the Linux kernel, the following vulnerability has been resolved:

tpm: Lock TPM chip in tpm_pm_suspend() first

Setting TPM_CHIP_FLAG_SUSPENDED in the end of tpm_pm_suspend() can be racy
according, as this leaves window for tpm_hwrng_read() to be called while
the operation is in progress. The recent bug report gives also evidence of
this behaviour.

Aadress this by locking the TPM chip before checking any chip->flags both
in tpm_pm_suspend() and tpm_hwrng_read(). Move TPM_CHIP_FLAG_SUSPENDED

kernel.org https://git.kernel.org/stable/c/9265fed6db601ee2ec47577815387458ef4f047a [No types assigned]

kernel.org https://git.kernel.org/stable/c/bc203fe416abdd1c29da594565a7c3c4e979488e [No types assigned]