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Message-Id: <20201031165122.21539-4-dpsmith@apertussolutions.com> Date: Sat, 31 Oct 2020 12:51:21 -0400 From: "Daniel P. Smith" <dpsmith@...rtussolutions.com> To: linux-kernel@...r.kernel.org, x86@...nel.org, linux-integrity@...r.kernel.org Cc: ross.philipson@...cle.com, dpsmith@...rtussolutions.com, jarkko.sakkinen@...ux.intel.com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com, luto@...capital.net, trenchboot-devel@...glegroups.com Subject: [RFC PATCH 3/4] tpm: Conditionally use static buffer in TPM buffer management Memory management calls cannot be made in the compressed kernel environment to dynamically allocate TPM buffer space. For the Secure Launch early PCR extend code, use a static buffer instead. Signed-off-by: Daniel P. Smith <dpsmith@...rtussolutions.com> Signed-off-by: Ross Philipson <ross.philipson@...cle.com> --- include/linux/tpm_buffer.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/tpm_buffer.h b/include/linux/tpm_buffer.h index 8144a52fbc0a..c9482edf6618 100644 --- a/include/linux/tpm_buffer.h +++ b/include/linux/tpm_buffer.h @@ -18,6 +18,10 @@ #ifndef __LINUX_TPM_BUFFER_H__ #define __LINUX_TPM_BUFFER_H__ +#ifdef COMPRESSED_KERNEL +static u8 _tpm_buffer[PAGE_SIZE] = {0}; +#endif + struct tpm_header { __be16 tag; __be32 length; @@ -52,7 +56,11 @@ static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal) static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal) { +#ifdef COMPRESSED_KERNEL + buf->data = _tpm_buffer; +#else buf->data = (u8 *)__get_free_page(GFP_KERNEL); +#endif if (!buf->data) return -ENOMEM; @@ -63,7 +71,9 @@ static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal) static inline void tpm_buf_destroy(struct tpm_buf *buf) { +#ifndef COMPRESSED_KERNEL free_page((unsigned long)buf->data); +#endif } static inline u32 tpm_buf_length(struct tpm_buf *buf) @@ -92,7 +102,9 @@ static inline void tpm_buf_append(struct tpm_buf *buf, return; if ((len + new_len) > PAGE_SIZE) { +#ifndef COMPRESSED_KERNEL WARN(1, "tpm_buf: overflow\n"); +#endif buf->flags |= TPM_BUF_OVERFLOW; return; } -- 2.11.0
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