From: Maurizio Drocco maurizio.drocco@ibm.com
[ Upstream commit 20c59ce010f84300f6c655d32db2610d3433f85c ]
Registers 8-9 are used to store measurements of the kernel and its command line (e.g., grub2 bootloader with tpm module enabled). IMA should include them in the boot aggregate. Registers 8-9 should be only included in non-SHA1 digests to avoid ambiguity.
Signed-off-by: Maurizio Drocco maurizio.drocco@ibm.com Reviewed-by: Bruno Meneguele bmeneg@redhat.com Tested-by: Bruno Meneguele bmeneg@redhat.com (TPM 1.2, TPM 2.0) Signed-off-by: Mimi Zohar zohar@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- security/integrity/ima/ima.h | 2 +- security/integrity/ima/ima_crypto.c | 15 ++++++++++++++- 2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 8173982e00ab5..5fae6cfe8d910 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -30,7 +30,7 @@
enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN, IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII }; -enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 }; +enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 };
/* digest size for IMA, fits SHA1 or MD5 */ #define IMA_DIGEST_SIZE SHA1_DIGEST_SIZE diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index d86825261b515..b06baf5d3cd32 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c @@ -682,7 +682,7 @@ static int ima_calc_boot_aggregate_tfm(char *digest, u16 alg_id, if (rc != 0) return rc;
- /* cumulative sha1 over tpm registers 0-7 */ + /* cumulative digest over TPM registers 0-7 */ for (i = TPM_PCR0; i < TPM_PCR8; i++) { ima_pcrread(i, &d); /* now accumulate with current aggregate */ @@ -691,6 +691,19 @@ static int ima_calc_boot_aggregate_tfm(char *digest, u16 alg_id, if (rc != 0) return rc; } + /* + * Extend cumulative digest over TPM registers 8-9, which contain + * measurement for the kernel command line (reg. 8) and image (reg. 9) + * in a typical PCR allocation. Registers 8-9 are only included in + * non-SHA1 boot_aggregate digests to avoid ambiguity. + */ + if (alg_id != TPM_ALG_SHA1) { + for (i = TPM_PCR8; i < TPM_PCR10; i++) { + ima_pcrread(i, &d); + rc = crypto_shash_update(shash, d.digest, + crypto_shash_digestsize(tfm)); + } + } if (!rc) crypto_shash_final(shash, digest); return rc;