Messages in this thread Patch in this message | | | From | "Daniel P. Smith" <> | Subject | [RFC PATCH 3/4] tpm: Conditionally use static buffer in TPM buffer management | Date | Sat, 31 Oct 2020 12:51:21 -0400 |
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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@apertussolutions.com> Signed-off-by: Ross Philipson <ross.philipson@oracle.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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