CVE-2024-53085 Information

Description

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 check inside tpm_get_random() so that it will be always checked only when the lock is reserved.

Reference

https://git.kernel.org/stable/c/bc203fe416abdd1c29da594565a7c3c4e979488e https://git.kernel.org/stable/c/9265fed6db601ee2ec47577815387458ef4f047a