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ima: add support for measuring and appraising firmware

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The "security: introduce kernel_fw_from_file hook" patch defined a
new security hook to evaluate any loaded firmware that wasn't built
into the kernel.

This patch defines ima_fw_from_file(), which is called from the new
security hook, to measure and/or appraise the loaded firmware's
integrity.

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Mimi Zohar
2014-07-22 10:39:48 -04:00
committed by Kees Cook
parent 6593d9245b
commit 5a9196d715
8 changed files with 50 additions and 5 deletions
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4
Documentation/ABI/testing/ima_policy
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@@ -26,6 +26,7 @@ Description:
option: [[appraise_type=]] [permit_directio]
base: func:= [BPRM_CHECK][MMAP_CHECK][FILE_CHECK][MODULE_CHECK]
[FIRMWARE_CHECK]
mask:= [MAY_READ] [MAY_WRITE] [MAY_APPEND] [MAY_EXEC]
fsmagic:= hex value
fsuuid:= file system UUID (e.g 8bcbe394-4f13-4144-be8e-5aa9ea2ce2f6)
@@ -57,7 +58,8 @@ Description:
measure func=BPRM_CHECK
measure func=FILE_MMAP mask=MAY_EXEC
measure func=FILE_CHECK mask=MAY_READ uid=0
measure func=MODULE_CHECK uid=0
measure func=MODULE_CHECK
measure func=FIRMWARE_CHECK
appraise fowner=0
The default policy measures all executables in bprm_check,