Re: [PATCH v9 11/11] tpm-buf: Implement managed allocations

Jarkko Sakkinen
2026-02-08T14:09:13Z

On Sun, Jan 25, 2026 at 09:25:21PM +0200, Jarkko Sakkinen wrote:
> From: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>
>
> Decouple kzalloc from buffer creation, so that a managed allocation can be
> used:
>
> struct tpm_buf *buf __free(kfree) buf = kzalloc(TPM_BUFSIZE,
> GFP_KERNEL);
> if (!buf)
> return -ENOMEM;
>
> tpm_buf_init(buf, TPM_BUFSIZE);
>
> Alternatively, stack allocations are also possible:
>
> u8 buf_data[512];
> struct tpm_buf *buf = (struct tpm_buf *)buf_data;
> tpm_buf_init(buf, sizeof(buf_data));
>
> This is achieved by embedding buffer's header inside the allocated blob,
> instead of having an outer wrapper.
>
> Cc: Ross Philipson <ross.philipson@oracle.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>
> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>

Since rest of the series does not seem to move forward maybe I should
rebase this to bottom and send it as a separate patch?

This patch eliminates a category of memory bugs and is that way useful.

It also starts to be pretty well stress tested.

BR, Jarkko