1
  *   ˆl–Ü4ý( ©³( 	Å€fàB¦-ÿÁƒB×_†I|¥+ÁÀ Z    /* SPDX-License-Identifier: GPL-2.0 */
/*
 * Common syscall restarting data
 */
#ifndef __LINUX_RESTART_BLOCK_H
#define __LINUX_RESTART_BLOCK_H

#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/time64.h>

struct timespec;
struct old_timespec32;
struct pollfd;

enum timespec_type {
	TT_NONE		= 0,
	TT_NATIVE	= 1,
	TT_COMPAT	= 2,
};

/*
 * System call restart block.
 */
struct restart_block {
	unsigned long arch_data;
	long (*fn)(struct restart_block *);
	union {
		/* For futex_wait() */
		struct {
			u32 __user *uaddr;
			u32 val;
			u32 flags;
			u32 bitset;
			u64 time;
			u32 __user *uaddr2;
		} futex;
		/* For nanosleep */
		struct {
			clockid_t clockid;
			enum timespec_type type;
			union {
				struct __kernel_timespec __user *rmtp;
				struct old_timespec32 __user *compat_rmtp;
			};
			u64 expires;
		} nanosleep;
		/* For poll */
		struct {
			struct pollfd __user *ufds;
			int nfds;
			int has_timeout;
			unsigned long tv_sec;
			unsigned long tv_nsec;
		} poll;
	};
};

extern long do_no_restart_syscall(struct restart_block *parm);

#endif /* __LINUX_RESTART_BLOCK_H */
  "   ˆl–Ým_J*j"TâÀ³q¦TÅ£Ãƒh¹ÂÁ      1
     ˆÀÃƒ}°‹¿ÂÁ %(    /* SPDX-License-Identifier: GPL-2.0 */
/*
 * fs-verity: read-only file-based authenticity protection
 *
 * This header declares the interface between the fs/verity/ support layer and
 * filesystems that support fs-verity.
 *
 * Copyright 2019 Google LLC
 */

#ifndef _LINUX_FSVERITY_H
#define _LINUX_FSVERITY_H

#include <linux/fs.h>
#include <linux/mm.h>
#include <crypto/hash_info.h>
#include <crypto/sha2.h>
#include <uapi/linux/fsverity.h>

/*
 * Largest digest size among all hash algorithms supported by fs-verity.
 * Currently assumed to be <= size of fsverity_descriptor::root_hash.
 */
#define FS_VERITY_MAX_DIGEST_SIZE	SHA512_DIGEST_SIZE

/* Arbitrary limit to bound the kmalloc() size.  Can be changed. */
#define FS_VERITY_MAX_DESCRIPTOR_SIZE	16384

/* Verity operations for filesystems */
struct fsverity_operations {

	/**
	 * Begin enabling verity on the given file.
	 *
	 * @filp: a readonly file descriptor for the file
	 *
	 * The filesystem must do any needed filesystem-specific preparations
	 * for enabling verity, e.g. evicting inline data.  It also must return
	 * -EBUSY if verity is already being enabled on the given file.
	 *
	 * i_rwsem is held for write.
	 *
	 * Return: 0 on success, -errno on failure
	 */
	int (*begin_enable_verity)(struct file *filp);

	/**
	 * End enabling verity on the given file.
	 *
	 * @filp: a readonly file descriptor for the file
	 * @desc: the verity descriptor to write, or NULL on failure
	 * @desc_size: size of verity descriptor, or 0 on failure
	 * @merkle_tree_size: total bytes the Merkle tree took up
	 *
	 * If desc == NULL, then enabling verity failed and the filesystem only
	 * must do any necessary cleanups.  Else, it must also store the given
	 * verity descriptor to a fs-specific location associated with the inode
	 * and do any fs-specific actions needed to mark the inode as a verity
	 * inode, e.g. setting a bit in the on-disk inode.  The filesystem is
	 * also responsible for setting the S_VERITY flag in the VFS inode.
	 *
	 * i_rwsem is held for write, but it may have been dropped between
	 * ->begin_enable_verity() and ->end_enable_verity().
	 *
	 * Return: 0 on success, -errno on failure
	 */
	int (*end_enable_verity)(struct file *filp, const void *desc,
				 size_t desc_size, u64 merkle_tree_size);

	/**
	 * Get the verity descriptor of the given inode.
	 *
	 * @inode: an inode with the S_VERITY flag set
	 * @buf: buffer in which to place the verity descriptor
	 * @bufsize: size of @buf, or 0 to retrieve the size only
	 *
	 * If bufsize == 0, then the size of the verity descriptor is returned.
	 * Otherwise the verity descriptor is written to 'buf' and its actual
	 * size is returned; -ERANGE is returned if it's too large.  This may be
	 * called by multiple processes concurrently on the same inode.
	 *
	 * Return: the size on suc