151 lines
3.8 KiB
C
Executable File
151 lines
3.8 KiB
C
Executable File
/*
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* Copyright (C) 2015 Samsung Electronics, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/cred.h>
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#include <linux/crypto.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/cpu.h>
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#include <linux/gfp.h>
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#include <linux/spinlock.h>
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#include <crypto/sha.h>
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#include "sysdep.h"
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int sysdep_idr_alloc(struct idr *idr, void *mem)
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{
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int res;
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0)
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res = idr_alloc(idr, mem, 1, 0, GFP_KERNEL);
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#else
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int tmp_id;
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do {
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if (!idr_pre_get(idr, GFP_KERNEL)) {
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res = -ENOMEM;
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break;
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}
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/* Reserving zero value helps with special case handling elsewhere */
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res = idr_get_new_above(idr, mem, 1, &tmp_id);
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if (res != -EAGAIN)
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break;
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} while (1);
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/* Simulate behaviour of new version */
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res = res ? -ENOMEM : tmp_id;
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#endif
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return res;
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}
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long sysdep_get_user_pages(struct task_struct *task,
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struct mm_struct *mm, unsigned long start, unsigned long nr_pages,
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int write, int force, struct page **pages,
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struct vm_area_struct **vmas)
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{
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
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unsigned int flags = 0;
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if (write)
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flags |= FOLL_WRITE;
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if (force)
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flags |= FOLL_FORCE;
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#endif
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
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return get_user_pages_remote(task, mm, start, nr_pages, flags, pages, vmas, NULL);
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
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return get_user_pages_remote(task, mm, start, nr_pages, flags, pages, vmas);
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#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)
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return get_user_pages_remote(task, mm, start, nr_pages, write, force, pages, vmas);
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#else
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return get_user_pages(task, mm, start, nr_pages, write, force, pages, vmas);
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#endif
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}
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void sysdep_register_cpu_notifier(struct notifier_block* notifier,
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int (*startup)(unsigned int cpu),
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int (*teardown)(unsigned int cpu))
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{
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
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cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "tee/teegris:online",
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startup, teardown);
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#else
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/* Register PM notifier */
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register_cpu_notifier(notifier);
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#endif
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}
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void sysdep_unregister_cpu_notifier(struct notifier_block* notifier)
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{
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
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cpuhp_remove_state_nocalls(CPUHP_AP_ONLINE_DYN);
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#else
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unregister_cpu_notifier(notifier);
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#endif
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}
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int sysdep_crypto_sha1(uint8_t* hash, struct scatterlist* sg, char *p, int len)
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{
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)
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struct crypto_shash *tfm;
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tfm = crypto_alloc_shash("sha1", 0, 0);
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if (IS_ERR(tfm))
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return PTR_ERR(tfm);
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{
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SHASH_DESC_ON_STACK(desc, tfm);
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desc->tfm = tfm;
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desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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crypto_shash_init(desc);
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crypto_shash_update(desc, (u8 *)p, len);
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crypto_shash_final(desc, hash);
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shash_desc_zero(desc);
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crypto_free_shash(tfm);
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}
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#else
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struct hash_desc hdesc;
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if (IS_ERR(hdesc.tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC)))
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return PTR_ERR(hdesc.tfm);
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crypto_hash_init(&hdesc);
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crypto_hash_update(&hdesc, sg, len);
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crypto_hash_final(&hdesc, hash);
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crypto_free_hash(hdesc.tfm);
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#endif
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return 0;
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}
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int sysdep_vfs_getattr(struct file *filp, struct kstat *stat)
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{
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,9,0))
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struct path p;
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p.mnt = filp->f_path.mnt;
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p.dentry = filp->f_path.dentry;
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return vfs_getattr(&p, stat, STATX_SIZE, KSTAT_QUERY_FLAGS);
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#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
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return vfs_getattr(&filp->f_path, stat);
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#else
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return vfs_getattr(filp->f_path.mnt, filp->f_path.dentry, stat);
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#endif
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}
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