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| author | Roberto Sassu <roberto.sassu@huawei.com> | 2021-05-14 18:27:47 +0300 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.ibm.com> | 2021-05-21 19:48:39 +0300 |
| commit | cdef685be5b4ae55c3959289e72d520402839c29 (patch) | |
| tree | 9fafacdad2075d1f7e0da5cac4fa9b6c144230b5 /include/linux/integrity.h | |
| parent | 4a804b8a4572dfc81c3a59709d49ae206e4370ba (diff) | |
| download | linux-cdef685be5b4ae55c3959289e72d520402839c29.tar.xz | |
evm: Allow xattr/attr operations for portable signatures
If files with portable signatures are copied from one location to another
or are extracted from an archive, verification can temporarily fail until
all xattrs/attrs are set in the destination. Only portable signatures may
be moved or copied from one file to another, as they don't depend on
system-specific information such as the inode generation. Instead portable
signatures must include security.ima.
Unlike other security.evm types, EVM portable signatures are also
immutable. Thus, it wouldn't be a problem to allow xattr/attr operations
when verification fails, as portable signatures will never be replaced with
the HMAC on possibly corrupted xattrs/attrs.
This patch first introduces a new integrity status called
INTEGRITY_FAIL_IMMUTABLE, that allows callers of
evm_verify_current_integrity() to detect that a portable signature didn't
pass verification and then adds an exception in evm_protect_xattr() and
evm_inode_setattr() for this status and returns 0 instead of -EPERM.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'include/linux/integrity.h')
| -rw-r--r-- | include/linux/integrity.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/integrity.h b/include/linux/integrity.h index 2271939c5c31..2ea0f2f65ab6 100644 --- a/include/linux/integrity.h +++ b/include/linux/integrity.h @@ -13,6 +13,7 @@ enum integrity_status { INTEGRITY_PASS = 0, INTEGRITY_PASS_IMMUTABLE, INTEGRITY_FAIL, + INTEGRITY_FAIL_IMMUTABLE, INTEGRITY_NOLABEL, INTEGRITY_NOXATTRS, INTEGRITY_UNKNOWN, |