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authorMimi Zohar <zohar@linux.ibm.com>2023-10-18 14:47:02 -0400
committerMimi Zohar <zohar@linux.ibm.com>2023-10-31 08:22:36 -0400
commitb836c4d29f2744200b2af41e14bf50758dddc818 (patch)
tree4ec0534db76707ad1e7d5a0ffe3a1bcd5b140901 /crypto/asymmetric_keys
parentb46503068cb9ed63ff1d8250f143354ead0b16eb (diff)
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ima: detect changes to the backing overlay file
Commit 18b44bc5a672 ("ovl: Always reevaluate the file signature for IMA") forced signature re-evaulation on every file access. Instead of always re-evaluating the file's integrity, detect a change to the backing file, by comparing the cached file metadata with the backing file's metadata. Verifying just the i_version has not changed is insufficient. In addition save and compare the i_ino and s_dev as well. Reviewed-by: Amir Goldstein <amir73il@gmail.com> Tested-by: Eric Snowberg <eric.snowberg@oracle.com> Tested-by: Raul E Rangel <rrangel@chromium.org> Cc: stable@vger.kernel.org Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
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