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    Subject[PATCH 00/14] EVM
    Extended Verification Module(EVM) detects offline tampering of the
    security extended attributes (e.g. security.selinux, security.SMACK64,
    security.ima), which is the basis for LSM permission decisions and,
    with this set of patches, integrity appraisal decisions. To detect
    offline tampering of the extended attributes, EVM maintains an
    HMAC-sha1 across a set of security extended attributes, storing the
    HMAC as the extended attribute 'security.evm'. To verify the integrity
    of an extended attribute, EVM exports evm_verifyxattr(), which
    re-calculates the HMAC and compares it with the version stored in

    IMA currently maintains an integrity measurement list, containing
    the hashes of all executables, mmaped execute files, and files open
    for read by root (assuming the default measurement policy). The
    measurement list, with other information, can be used to assert the
    integrity of the running system to a third party. The "ima: integrity
    appraisal extension" patch extends IMA with local measurement
    appraisal. The extension stores and maintains the file integrity
    measurement as an extended attribute 'security.ima', which EVM can be
    configured to protect.

    DAC/MAC protect the integrity of a running system. An offline attack
    can bypass these protection mechanisms by mounting the disk under a
    different operating system and modifying the file data/metadata. If
    the disk is subsequently remounted under the EVM + DAC/MAC + IMA
    protected OS, then the hash of the file data won't match the hash stored
    in the IMA xattr, or the TPM-calculated HMAC of the file's metadata won't
    be valid. Therefore, IMA + MAC + EVM can protect system integrity online
    and detect offline tampering.

    This patch set applies to the security-testing/next tree. They
    prereq remove-kref-set.patch (,
    linux-next commit 8e47f1004).

    Much appreciation to Dave Hansen, Serge Hallyn, and Matt Helsley for
    reviewing the patches.


    Mimi Zohar (14):
    integrity: move ima inode integrity data management
    security: move LSM xattrnames to xattr.h
    xattr: define vfs_getxattr_alloc and vfs_xattr_cmp
    evm: re-release
    ima: move ima_file_free before releasing the file
    security: imbed evm calls in security hooks
    evm: inode post removexattr
    evm: imbed evm_inode_post_setattr
    evm: inode_post_init
    fs: add evm_inode_post_init calls
    ima: integrity appraisal extension
    ima: appraise default rules
    ima: inode post_setattr
    ima: add ima_inode_setxattr and ima_inode_removexattr

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      Last update: 2010-04-21 23:53    [W:0.024 / U:3.888 seconds]
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