Commit fefb9f12 authored Apr 29, 2024 by James Bottomley Committed by Jarkko Sakkinen May 09, 2024

tpm: export the context save and load commands



The TPM2 session HMAC and encryption handling code needs to save and
restore a single volatile context for the elliptic curve version of
the NULL seed, so export the APIs which do this for internal use.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Tested-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

parent 11189d68

drivers/char/tpm/tpm.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -312,6 +312,10 @@ int tpm2_commit_space(struct tpm_chip chip, struct tpm_space space, void *buf,
		size_t *bufsiz);
		int tpm_devs_add(struct tpm_chip *chip);
		void tpm_devs_remove(struct tpm_chip *chip);
		int tpm2_save_context(struct tpm_chip chip, u32 handle, u8 buf,
		unsigned int buf_size, unsigned int *offset);
		int tpm2_load_context(struct tpm_chip chip, u8 buf,
		unsigned int offset, u32 handle);

		void tpm_bios_log_setup(struct tpm_chip *chip);
		void tpm_bios_log_teardown(struct tpm_chip *chip);

drivers/char/tpm/tpm2-space.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -68,7 +68,7 @@ void tpm2_del_space(struct tpm_chip chip, struct tpm_space space)
		kfree(space->session_buf);
		}

		static int tpm2_load_context(struct tpm_chip chip, u8 buf,
		int tpm2_load_context(struct tpm_chip chip, u8 buf,
		unsigned int offset, u32 handle)
		{
		struct tpm_buf tbuf;
		@@ -119,7 +119,7 @@ static int tpm2_load_context(struct tpm_chip chip, u8 buf,
		return 0;
		}

		static int tpm2_save_context(struct tpm_chip chip, u32 handle, u8 buf,
		int tpm2_save_context(struct tpm_chip chip, u32 handle, u8 buf,
		unsigned int buf_size, unsigned int *offset)
		{
		struct tpm_buf tbuf;