From: Jarkko Sakkinen <[email protected]> Merge TPM_BUF_BOUNDARY_ERROR and TPM_BUF_OVERFLOW into TPM_BUF_INVALID, given that they are identical. The only difference are the log messages.
In addition, add a missing TPM_BUF_INVALID check to tpm_buf_append_handle() following the pattern from other functions in tpm-buf.c. Signed-off-by: Jarkko Sakkinen <[email protected]> Reviewed-by: Jonathan McDowell <[email protected]> --- drivers/char/tpm/tpm-buf.c | 14 ++++++++------ include/linux/tpm.h | 8 +++----- security/keys/trusted-keys/trusted_tpm2.c | 6 +++--- 3 files changed, 14 insertions(+), 14 deletions(-) diff --git a/drivers/char/tpm/tpm-buf.c b/drivers/char/tpm/tpm-buf.c index dc882fc9fa9e..69ee77400539 100644 --- a/drivers/char/tpm/tpm-buf.c +++ b/drivers/char/tpm/tpm-buf.c @@ -104,13 +104,12 @@ EXPORT_SYMBOL_GPL(tpm_buf_length); */ void tpm_buf_append(struct tpm_buf *buf, const u8 *new_data, u16 new_length) { - /* Return silently if overflow has already happened. */ - if (buf->flags & TPM_BUF_OVERFLOW) + if (buf->flags & TPM_BUF_INVALID) return; if ((buf->length + new_length) > PAGE_SIZE) { WARN(1, "tpm_buf: write overflow\n"); - buf->flags |= TPM_BUF_OVERFLOW; + buf->flags |= TPM_BUF_INVALID; return; } @@ -157,8 +156,12 @@ EXPORT_SYMBOL_GPL(tpm_buf_append_u32); */ void tpm_buf_append_handle(struct tpm_chip *chip, struct tpm_buf *buf, u32 handle) { + if (buf->flags & TPM_BUF_INVALID) + return; + if (buf->flags & TPM_BUF_TPM2B) { dev_err(&chip->dev, "Invalid buffer type (TPM2B)\n"); + buf->flags |= TPM_BUF_INVALID; return; } @@ -177,14 +180,13 @@ static void tpm_buf_read(struct tpm_buf *buf, off_t *offset, size_t count, void { off_t next_offset; - /* Return silently if overflow has already happened. */ - if (buf->flags & TPM_BUF_BOUNDARY_ERROR) + if (buf->flags & TPM_BUF_INVALID) return; next_offset = *offset + count; if (next_offset > buf->length) { WARN(1, "tpm_buf: read out of boundary\n"); - buf->flags |= TPM_BUF_BOUNDARY_ERROR; + buf->flags |= TPM_BUF_INVALID; return; } diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 72610f1aa402..f8c135dd6e7b 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -382,12 +382,10 @@ struct tpm_header { } __packed; enum tpm_buf_flags { - /* the capacity exceeded: */ - TPM_BUF_OVERFLOW = BIT(0), /* TPM2B format: */ - TPM_BUF_TPM2B = BIT(1), - /* read out of boundary: */ - TPM_BUF_BOUNDARY_ERROR = BIT(2), + TPM_BUF_TPM2B = BIT(0), + /* The buffer is in invalid and unusable state: */ + TPM_BUF_INVALID = BIT(1), }; /* diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c index 3de84b30b655..6fcff1066873 100644 --- a/security/keys/trusted-keys/trusted_tpm2.c +++ b/security/keys/trusted-keys/trusted_tpm2.c @@ -292,7 +292,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip, /* creation PCR */ tpm_buf_append_u32(&buf, 0); - if (buf.flags & TPM_BUF_OVERFLOW) { + if (buf.flags & TPM_BUF_INVALID) { rc = -E2BIG; tpm2_end_auth_session(chip); goto out; @@ -308,7 +308,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip, goto out; blob_len = tpm_buf_read_u32(&buf, &offset); - if (blob_len > MAX_BLOB_SIZE || buf.flags & TPM_BUF_BOUNDARY_ERROR) { + if (blob_len > MAX_BLOB_SIZE || buf.flags & TPM_BUF_INVALID) { rc = -E2BIG; goto out; } @@ -412,7 +412,7 @@ static int tpm2_load_cmd(struct tpm_chip *chip, tpm_buf_append(&buf, blob, blob_len); - if (buf.flags & TPM_BUF_OVERFLOW) { + if (buf.flags & TPM_BUF_INVALID) { rc = -E2BIG; tpm2_end_auth_session(chip); goto out; -- 2.39.5
