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Revert "ima: limit file hash setting by user to fix and log modes"

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commit f5acb3dcba upstream.

Userspace applications have been modified to write security xattrs,
but they are not context aware.  In the case of security.ima, the
security xattr can be either a file hash or a file signature.
Permitting writing one, but not the other requires the application to
be context aware.

In addition, userspace applications might write files to a staging
area, which might not be in policy, and then change some file metadata
(eg. owner) making it in policy.  As a result, these files are not
labeled properly.

This reverts commit c68ed80c97, which
prevents writing file hashes as security.ima xattrs.

Requested-by: Patrick Ohly <patrick.ohly@intel.com>
Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mimi Zohar
2016-11-02 09:14:16 -04:00
committed by Greg Kroah-Hartman
parent 0f929c9692
commit 28fffa9066
1 changed files with 2 additions and 6 deletions
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8
security/integrity/ima/ima_appraise.c
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@@ -389,14 +389,10 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name,
result = ima_protect_xattr(dentry, xattr_name, xattr_value,
xattr_value_len);
if (result == 1) {
bool digsig;
if (!xattr_value_len || (xvalue->type >= IMA_XATTR_LAST))
return -EINVAL;
digsig = (xvalue->type == EVM_IMA_XATTR_DIGSIG);
if (!digsig && (ima_appraise & IMA_APPRAISE_ENFORCE))
return -EPERM;
ima_reset_appraise_flags(d_backing_inode(dentry), digsig);
ima_reset_appraise_flags(d_backing_inode(dentry),
(xvalue->type == EVM_IMA_XATTR_DIGSIG) ? 1 : 0);
result = 0;
}
return result;