[PATCH v3 17/22] ima: remove firmware and module specific cached status info
Dmitry Kasatkin
dmitry.kasatkin at gmail.com
Wed Feb 10 12:18:41 PST 2016
On Wed, Feb 3, 2016 at 9:06 PM, Mimi Zohar <zohar at linux.vnet.ibm.com> wrote:
> Each time a file is read by the kernel, the file should be re-measured and
> the file signature re-appraised, based on policy. As there is no need to
> preserve the status information, this patch replaces the firmware and
> module specific cache status with a generic one named read_file.
>
> This change simplifies adding support for other files read by the kernel.
>
> Signed-off-by: Mimi Zohar <zohar at linux.vnet.ibm.com>
> ---
> security/integrity/iint.c | 4 ++--
> security/integrity/ima/ima.h | 3 ++-
> security/integrity/ima/ima_appraise.c | 35 ++++++++++++++++-------------------
> security/integrity/ima/ima_policy.c | 9 ++++-----
> security/integrity/integrity.h | 16 ++++------------
> 5 files changed, 28 insertions(+), 39 deletions(-)
>
> diff --git a/security/integrity/iint.c b/security/integrity/iint.c
> index 8f1ab37..345b759 100644
> --- a/security/integrity/iint.c
> +++ b/security/integrity/iint.c
> @@ -77,7 +77,7 @@ static void iint_free(struct integrity_iint_cache *iint)
> iint->ima_file_status = INTEGRITY_UNKNOWN;
> iint->ima_mmap_status = INTEGRITY_UNKNOWN;
> iint->ima_bprm_status = INTEGRITY_UNKNOWN;
> - iint->ima_module_status = INTEGRITY_UNKNOWN;
> + iint->ima_read_status = INTEGRITY_UNKNOWN;
> iint->evm_status = INTEGRITY_UNKNOWN;
> kmem_cache_free(iint_cache, iint);
> }
> @@ -157,7 +157,7 @@ static void init_once(void *foo)
> iint->ima_file_status = INTEGRITY_UNKNOWN;
> iint->ima_mmap_status = INTEGRITY_UNKNOWN;
> iint->ima_bprm_status = INTEGRITY_UNKNOWN;
> - iint->ima_module_status = INTEGRITY_UNKNOWN;
> + iint->ima_read_status = INTEGRITY_UNKNOWN;
> iint->evm_status = INTEGRITY_UNKNOWN;
> }
>
> diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
> index 0b7134c..a5d2592 100644
> --- a/security/integrity/ima/ima.h
> +++ b/security/integrity/ima/ima.h
> @@ -144,9 +144,10 @@ enum ima_hooks {
> FILE_CHECK = 1,
> MMAP_CHECK,
> BPRM_CHECK,
> + POST_SETATTR,
> MODULE_CHECK,
> FIRMWARE_CHECK,
> - POST_SETATTR
> + MAX_CHECK
> };
>
> /* LIM API function definitions */
> diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
> index cb0d0ff..6b4694a 100644
> --- a/security/integrity/ima/ima_appraise.c
> +++ b/security/integrity/ima/ima_appraise.c
> @@ -74,13 +74,12 @@ enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
> return iint->ima_mmap_status;
> case BPRM_CHECK:
> return iint->ima_bprm_status;
> - case MODULE_CHECK:
> - return iint->ima_module_status;
> - case FIRMWARE_CHECK:
> - return iint->ima_firmware_status;
> case FILE_CHECK:
> - default:
> + case POST_SETATTR:
> return iint->ima_file_status;
> + case MODULE_CHECK ... MAX_CHECK - 1:
Will LLVM clang handles this range?
Otherwise it can be just like:
case MODULE_CHECK ... MAX_CHECK :
> + default:
> + return iint->ima_read_status;
> }
> }
>
> @@ -95,15 +94,14 @@ static void ima_set_cache_status(struct integrity_iint_cache *iint,
> case BPRM_CHECK:
> iint->ima_bprm_status = status;
> break;
> - case MODULE_CHECK:
> - iint->ima_module_status = status;
> - break;
> - case FIRMWARE_CHECK:
> - iint->ima_firmware_status = status;
> - break;
> case FILE_CHECK:
> - default:
> + case POST_SETATTR:
> iint->ima_file_status = status;
> + break;
> + case MODULE_CHECK ... MAX_CHECK - 1:
> + default:
> + iint->ima_read_status = status;
> + break;
> }
> }
>
> @@ -117,15 +115,14 @@ static void ima_cache_flags(struct integrity_iint_cache *iint,
> case BPRM_CHECK:
> iint->flags |= (IMA_BPRM_APPRAISED | IMA_APPRAISED);
> break;
> - case MODULE_CHECK:
> - iint->flags |= (IMA_MODULE_APPRAISED | IMA_APPRAISED);
> - break;
> - case FIRMWARE_CHECK:
> - iint->flags |= (IMA_FIRMWARE_APPRAISED | IMA_APPRAISED);
> - break;
> case FILE_CHECK:
> - default:
> + case POST_SETATTR:
> iint->flags |= (IMA_FILE_APPRAISED | IMA_APPRAISED);
> + break;
> + case MODULE_CHECK ... MAX_CHECK - 1:
> + default:
> + iint->flags |= (IMA_READ_APPRAISED | IMA_APPRAISED);
> + break;
> }
> }
>
> diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
> index cfbe86f..7571ce8 100644
> --- a/security/integrity/ima/ima_policy.c
> +++ b/security/integrity/ima/ima_policy.c
> @@ -300,13 +300,12 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
> return IMA_MMAP_APPRAISE;
> case BPRM_CHECK:
> return IMA_BPRM_APPRAISE;
> - case MODULE_CHECK:
> - return IMA_MODULE_APPRAISE;
> - case FIRMWARE_CHECK:
> - return IMA_FIRMWARE_APPRAISE;
> case FILE_CHECK:
> - default:
> + case POST_SETATTR:
> return IMA_FILE_APPRAISE;
> + case MODULE_CHECK ... MAX_CHECK - 1:
> + default:
> + return IMA_READ_APPRAISE;
> }
> }
>
> diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
> index 9a0ea4c..c7a111c 100644
> --- a/security/integrity/integrity.h
> +++ b/security/integrity/integrity.h
> @@ -45,18 +45,12 @@
> #define IMA_MMAP_APPRAISED 0x00000800
> #define IMA_BPRM_APPRAISE 0x00001000
> #define IMA_BPRM_APPRAISED 0x00002000
> -#define IMA_MODULE_APPRAISE 0x00004000
> -#define IMA_MODULE_APPRAISED 0x00008000
> -#define IMA_FIRMWARE_APPRAISE 0x00010000
> -#define IMA_FIRMWARE_APPRAISED 0x00020000
> -#define IMA_READ_APPRAISE 0x00040000
> -#define IMA_READ_APPRAISED 0x00080000
> +#define IMA_READ_APPRAISE 0x00004000
> +#define IMA_READ_APPRAISED 0x00008000
> #define IMA_APPRAISE_SUBMASK (IMA_FILE_APPRAISE | IMA_MMAP_APPRAISE | \
> - IMA_BPRM_APPRAISE | IMA_MODULE_APPRAISE | \
> - IMA_FIRMWARE_APPRAISE | IMA_READ_APPRAISE)
> + IMA_BPRM_APPRAISE | IMA_READ_APPRAISE)
> #define IMA_APPRAISED_SUBMASK (IMA_FILE_APPRAISED | IMA_MMAP_APPRAISED | \
> - IMA_BPRM_APPRAISED | IMA_MODULE_APPRAISED | \
> - IMA_FIRMWARE_APPRAISED | IMA_READ_APPRAISED)
> + IMA_BPRM_APPRAISED | IMA_READ_APPRAISED)
>
> enum evm_ima_xattr_type {
> IMA_XATTR_DIGEST = 0x01,
> @@ -111,8 +105,6 @@ struct integrity_iint_cache {
> enum integrity_status ima_file_status:4;
> enum integrity_status ima_mmap_status:4;
> enum integrity_status ima_bprm_status:4;
> - enum integrity_status ima_module_status:4;
> - enum integrity_status ima_firmware_status:4;
> enum integrity_status ima_read_status:4;
> enum integrity_status evm_status:4;
> struct ima_digest_data *ima_hash;
> --
> 2.1.0
>
--
Thanks,
Dmitry
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