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tpm-buf: Memory-safe allocations

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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, other allocations are also possible (static data, stack,
etc) for example:

	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.

Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>
Tested-by: Srish Srinivasan <ssrish@linux.ibm.com>
Message-ID: <20260522013555.1063716-1-jarkko@kernel.org>
Signed-off-by: Ross Philipson <ross.philipson@oracle.com>
This commit is contained in:
Jarkko Sakkinen 2026-07-11 09:01:09 -07:00 • committed by Jarkko Sakkinen
commit 3d9e043dab
10 changed files with 530 additions and 534 deletions
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