d895cb1af1
Pull vfs pile (part one) from Al Viro: "Assorted stuff - cleaning namei.c up a bit, fixing ->d_name/->d_parent locking violations, etc. The most visible changes here are death of FS_REVAL_DOT (replaced with "has ->d_weak_revalidate()") and a new helper getting from struct file to inode. Some bits of preparation to xattr method interface changes. Misc patches by various people sent this cycle *and* ocfs2 fixes from several cycles ago that should've been upstream right then. PS: the next vfs pile will be xattr stuff." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (46 commits) saner proc_get_inode() calling conventions proc: avoid extra pde_put() in proc_fill_super() fs: change return values from -EACCES to -EPERM fs/exec.c: make bprm_mm_init() static ocfs2/dlm: use GFP_ATOMIC inside a spin_lock ocfs2: fix possible use-after-free with AIO ocfs2: Fix oops in ocfs2_fast_symlink_readpage() code path get_empty_filp()/alloc_file() leave both ->f_pos and ->f_version zero target: writev() on single-element vector is pointless export kernel_write(), convert open-coded instances fs: encode_fh: return FILEID_INVALID if invalid fid_type kill f_vfsmnt vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op nfsd: handle vfs_getattr errors in acl protocol switch vfs_getattr() to struct path default SET_PERSONALITY() in linux/elf.h ceph: prepopulate inodes only when request is aborted d_hash_and_lookup(): export, switch open-coded instances 9p: switch v9fs_set_create_acl() to inode+fid, do it before d_instantiate() 9p: split dropping the acls from v9fs_set_create_acl() ...
148 lines
3 KiB
C
148 lines
3 KiB
C
/*
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* Copyright (C) 2005,2006,2007,2008 IBM Corporation
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*
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* Authors:
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* Mimi Zohar <zohar@us.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* File: ima_crypto.c
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* Calculates md5/sha1 file hash, template hash, boot-aggreate hash
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*/
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#include <linux/kernel.h>
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#include <linux/file.h>
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#include <linux/crypto.h>
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#include <linux/scatterlist.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <crypto/hash.h>
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#include "ima.h"
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static struct crypto_shash *ima_shash_tfm;
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int ima_init_crypto(void)
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{
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long rc;
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ima_shash_tfm = crypto_alloc_shash(ima_hash, 0, 0);
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if (IS_ERR(ima_shash_tfm)) {
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rc = PTR_ERR(ima_shash_tfm);
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pr_err("Can not allocate %s (reason: %ld)\n", ima_hash, rc);
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return rc;
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}
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return 0;
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}
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/*
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* Calculate the MD5/SHA1 file digest
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*/
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int ima_calc_file_hash(struct file *file, char *digest)
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{
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loff_t i_size, offset = 0;
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char *rbuf;
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int rc, read = 0;
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struct {
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struct shash_desc shash;
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char ctx[crypto_shash_descsize(ima_shash_tfm)];
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} desc;
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desc.shash.tfm = ima_shash_tfm;
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desc.shash.flags = 0;
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rc = crypto_shash_init(&desc.shash);
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if (rc != 0)
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return rc;
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rbuf = kzalloc(PAGE_SIZE, GFP_KERNEL);
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if (!rbuf) {
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rc = -ENOMEM;
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goto out;
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}
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if (!(file->f_mode & FMODE_READ)) {
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file->f_mode |= FMODE_READ;
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read = 1;
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}
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i_size = i_size_read(file_inode(file));
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while (offset < i_size) {
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int rbuf_len;
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rbuf_len = kernel_read(file, offset, rbuf, PAGE_SIZE);
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if (rbuf_len < 0) {
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rc = rbuf_len;
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break;
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}
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if (rbuf_len == 0)
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break;
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offset += rbuf_len;
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rc = crypto_shash_update(&desc.shash, rbuf, rbuf_len);
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if (rc)
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break;
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}
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kfree(rbuf);
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if (!rc)
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rc = crypto_shash_final(&desc.shash, digest);
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if (read)
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file->f_mode &= ~FMODE_READ;
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out:
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return rc;
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}
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/*
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* Calculate the hash of a given buffer
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*/
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int ima_calc_buffer_hash(const void *data, int len, char *digest)
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{
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struct {
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struct shash_desc shash;
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char ctx[crypto_shash_descsize(ima_shash_tfm)];
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} desc;
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desc.shash.tfm = ima_shash_tfm;
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desc.shash.flags = 0;
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return crypto_shash_digest(&desc.shash, data, len, digest);
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}
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static void __init ima_pcrread(int idx, u8 *pcr)
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{
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if (!ima_used_chip)
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return;
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if (tpm_pcr_read(TPM_ANY_NUM, idx, pcr) != 0)
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pr_err("IMA: Error Communicating to TPM chip\n");
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}
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/*
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* Calculate the boot aggregate hash
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*/
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int __init ima_calc_boot_aggregate(char *digest)
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{
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u8 pcr_i[IMA_DIGEST_SIZE];
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int rc, i;
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struct {
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struct shash_desc shash;
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char ctx[crypto_shash_descsize(ima_shash_tfm)];
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} desc;
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desc.shash.tfm = ima_shash_tfm;
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desc.shash.flags = 0;
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rc = crypto_shash_init(&desc.shash);
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if (rc != 0)
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return rc;
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/* cumulative sha1 over tpm registers 0-7 */
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for (i = TPM_PCR0; i < TPM_PCR8; i++) {
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ima_pcrread(i, pcr_i);
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/* now accumulate with current aggregate */
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rc = crypto_shash_update(&desc.shash, pcr_i, IMA_DIGEST_SIZE);
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}
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if (!rc)
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crypto_shash_final(&desc.shash, digest);
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return rc;
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}
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