In the Linux kernel, the following vulnerability has been resolved:
tpm: tpm_tis_spi: Use wait_woken() in wait_for_tmp_stat()
wait_event_interruptible_timeout() evaluates its condition after setting the current task state to TASK_INTERRUPTIBLE.
With CONFIG_DEBUG_ATOMIC_SLEEP this triggers a warning when the IRQ wait path is used:
tpm_tis_status()
tpm_tis_spi_read_bytes()
tpm_tis_spi_transfer_full()
spi_bus_lock()
mutex_lock()
Address this with the following measures:
- Call wait_tpm_stat_cond() only while tasking is running.
- Use wait_woken() to wait for changes.
References
- https://git.kernel.org/stable/c/4bb3e1bc142dc9c3240ceed1b3ab031aa9cb1723
- https://git.kernel.org/stable/c/6b068a97958aa00a901a9b5083d74114b21f7b66
- https://git.kernel.org/stable/c/ba33b4f9d3423accd2c91a0b0b0680cd589922f2
- https://git.kernel.org/stable/c/bb63a0530e8e6de3aaf29cd5ba487db2490128ef
- https://git.kernel.org/stable/c/c0c9cfb3b75def8bf200a2d4db09015806acfeaf
- https://git.kernel.org/stable/c/c9acbe38797bc1aa3c22a1ab72452e210af6e0ff