evm: Use the metadata inode to calculate metadata hash
Changes to file attributes (mode bits, uid, gid) on the lower layer are not taken into account when d_backing_inode() is used when a file is accessed on the overlay layer and this file has not yet been copied up. This is because d_backing_inode() does not return the real inode of the lower layer but instead returns the backing inode which in this case holds wrong file attributes. Further, when CONFIG_OVERLAY_FS_METACOPY is enabled and a copy-up is triggered due to file metadata changes, then the metadata are held by the backing inode while the data are still held by the real inode. Therefore, use d_inode(d_real(dentry, D_REAL_METADATA)) to get to the file's metadata inode and use it to calculate the metadata hash with. Co-developed-by: Mimi Zohar <zohar@linux.ibm.com> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Acked-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
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@ -223,7 +223,7 @@ static int evm_calc_hmac_or_hash(struct dentry *dentry,
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size_t req_xattr_value_len,
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size_t req_xattr_value_len,
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uint8_t type, struct evm_digest *data)
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uint8_t type, struct evm_digest *data)
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{
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{
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struct inode *inode = d_backing_inode(dentry);
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struct inode *inode = d_inode(d_real(dentry, D_REAL_METADATA));
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struct xattr_list *xattr;
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struct xattr_list *xattr;
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struct shash_desc *desc;
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struct shash_desc *desc;
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size_t xattr_size = 0;
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size_t xattr_size = 0;
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