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linux/security/integrity/ima
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Roberto Sassu 020aae3ee5 ima: do not update security.ima if appraisal status is not INTEGRITY_PASS 
Commit b65a9cfc2c ("Untangling ima mess, part 2: deal with counters")
moved the call of ima_file_check() from may_open() to do_filp_open() at a
point where the file descriptor is already opened.

This breaks the assumption made by IMA that file descriptors being closed
belong to files whose access was granted by ima_file_check(). The
consequence is that security.ima and security.evm are updated with good
values, regardless of the current appraisal status.

For example, if a file does not have security.ima, IMA will create it after
opening the file for writing, even if access is denied. Access to the file
will be allowed afterwards.

Avoid this issue by checking the appraisal status before updating
security.ima.

Cc: stable@vger.kernel.org
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
History 2017-11-20 08:23:10 +11:00
..
ima.h ima: Simplify policy_func_show. 2017-06-21 14:37:12 -04:00
ima_api.c ima: always measure and audit files in policy 2017-11-08 15:16:36 -05:00
ima_appraise.c ima: do not update security.ima if appraisal status is not INTEGRITY_PASS 2017-11-20 08:23:10 +11:00
ima_crypto.c Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2017-11-14 10:52:09 -08:00
ima_fs.c ima: Fix bool initialization/comparison 2017-11-08 15:16:36 -05:00
ima_init.c ima: on soft reboot, restore the measurement list 2016-12-20 09:48:43 -08:00
ima_kexec.c ima: define a canonical binary_runtime_measurements list format 2016-12-20 09:48:45 -08:00
ima_main.c ima: check signature enforcement against cmdline param instead of CONFIG 2017-11-08 15:16:36 -05:00
ima_mok.c KEYS: Use structure to capture key restriction function and data 2017-04-04 14:10:10 -07:00
ima_policy.c ima: Fix bool initialization/comparison 2017-11-08 15:16:36 -05:00
ima_queue.c ima: fix get_binary_runtime_size() 2017-06-21 14:37:12 -04:00
ima_template.c ima: use ima_parse_buf() to parse template data 2017-06-21 14:37:12 -04:00
ima_template_lib.c ima: introduce ima_parse_buf() 2017-06-21 14:37:12 -04:00
ima_template_lib.h ima: introduce ima_parse_buf() 2017-06-21 14:37:12 -04:00
Kconfig IMA: Correct Kconfig dependencies for hash selection 2017-06-21 14:37:12 -04:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00