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fs/read_write.c
22.4 KB
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/* * linux/fs/read_write.c * * Copyright (C) 1991, 1992 Linus Torvalds */ #include <linux/slab.h> #include <linux/stat.h> #include <linux/fcntl.h> #include <linux/file.h> #include <linux/uio.h> |
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#include <linux/fsnotify.h> |
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#include <linux/security.h> #include <linux/module.h> #include <linux/syscalls.h> |
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#include <linux/pagemap.h> |
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#include <linux/splice.h> |
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#include "read_write.h" |
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#include <asm/uaccess.h> #include <asm/unistd.h> |
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const struct file_operations generic_ro_fops = { |
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.llseek = generic_file_llseek, |
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.read = do_sync_read, .aio_read = generic_file_aio_read, |
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.mmap = generic_file_readonly_mmap, |
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.splice_read = generic_file_splice_read, |
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}; EXPORT_SYMBOL(generic_ro_fops); |
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static inline int unsigned_offsets(struct file *file) |
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{ |
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return file->f_mode & FMODE_UNSIGNED_OFFSET; |
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} |
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static loff_t lseek_execute(struct file *file, struct inode *inode, loff_t offset, loff_t maxsize) { if (offset < 0 && !unsigned_offsets(file)) return -EINVAL; if (offset > maxsize) return -EINVAL; if (offset != file->f_pos) { file->f_pos = offset; file->f_version = 0; } return offset; } |
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/** |
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* generic_file_llseek_size - generic llseek implementation for regular files |
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* @file: file structure to seek on * @offset: file offset to seek to * @origin: type of seek |
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* @size: max size of file system |
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* |
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* This is a variant of generic_file_llseek that allows passing in a custom * file size. |
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* * Synchronization: |
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* SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms) |
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* SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes. * read/writes behave like SEEK_SET against seeks. |
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*/ |
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loff_t |
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generic_file_llseek_size(struct file *file, loff_t offset, int origin, loff_t maxsize) |
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{ |
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struct inode *inode = file->f_mapping->host; |
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switch (origin) { |
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case SEEK_END: |
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offset += i_size_read(inode); |
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break; case SEEK_CUR: |
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/* * Here we special-case the lseek(fd, 0, SEEK_CUR) * position-querying operation. Avoid rewriting the "same" * f_pos value back to the file because a concurrent read(), * write() or lseek() might have altered it */ if (offset == 0) return file->f_pos; |
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/* * f_lock protects against read/modify/write race with other * SEEK_CURs. Note that parallel writes and reads behave * like SEEK_SET. */ spin_lock(&file->f_lock); offset = lseek_execute(file, inode, file->f_pos + offset, |
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maxsize); |
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spin_unlock(&file->f_lock); return offset; |
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case SEEK_DATA: /* * In the generic case the entire file is data, so as long as * offset isn't at the end of the file then the offset is data. */ |
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if (offset >= i_size_read(inode)) |
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return -ENXIO; break; case SEEK_HOLE: /* * There is a virtual hole at the end of the file, so as long as * offset isn't i_size or larger, return i_size. */ |
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if (offset >= i_size_read(inode)) |
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return -ENXIO; |
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offset = i_size_read(inode); |
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break; |
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} |
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|
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return lseek_execute(file, inode, offset, maxsize); } EXPORT_SYMBOL(generic_file_llseek_size); /** * generic_file_llseek - generic llseek implementation for regular files * @file: file structure to seek on * @offset: file offset to seek to * @origin: type of seek * * This is a generic implemenation of ->llseek useable for all normal local * filesystems. It just updates the file offset to the value specified by * @offset and @origin under i_mutex. */ loff_t generic_file_llseek(struct file *file, loff_t offset, int origin) { struct inode *inode = file->f_mapping->host; return generic_file_llseek_size(file, offset, origin, inode->i_sb->s_maxbytes); |
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} |
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EXPORT_SYMBOL(generic_file_llseek); |
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|
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/** * noop_llseek - No Operation Performed llseek implementation * @file: file structure to seek on * @offset: file offset to seek to * @origin: type of seek * * This is an implementation of ->llseek useable for the rare special case when * userspace expects the seek to succeed but the (device) file is actually not * able to perform the seek. In this case you use noop_llseek() instead of * falling back to the default implementation of ->llseek. */ loff_t noop_llseek(struct file *file, loff_t offset, int origin) { return file->f_pos; } EXPORT_SYMBOL(noop_llseek); |
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loff_t no_llseek(struct file *file, loff_t offset, int origin) { return -ESPIPE; } EXPORT_SYMBOL(no_llseek); loff_t default_llseek(struct file *file, loff_t offset, int origin) { |
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struct inode *inode = file->f_path.dentry->d_inode; |
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loff_t retval; |
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|
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mutex_lock(&inode->i_mutex); |
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switch (origin) { |
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case SEEK_END: |
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offset += i_size_read(inode); |
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break; |
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case SEEK_CUR: |
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if (offset == 0) { retval = file->f_pos; goto out; } |
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offset += file->f_pos; |
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break; case SEEK_DATA: /* * In the generic case the entire file is data, so as * long as offset isn't at the end of the file then the * offset is data. */ |
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if (offset >= inode->i_size) { retval = -ENXIO; goto out; } |
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break; case SEEK_HOLE: /* * There is a virtual hole at the end of the file, so * as long as offset isn't i_size or larger, return * i_size. */ |
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if (offset >= inode->i_size) { retval = -ENXIO; goto out; } |
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offset = inode->i_size; break; |
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} retval = -EINVAL; |
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if (offset >= 0 || unsigned_offsets(file)) { |
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if (offset != file->f_pos) { file->f_pos = offset; file->f_version = 0; } retval = offset; } |
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out: |
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mutex_unlock(&inode->i_mutex); |
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return retval; } EXPORT_SYMBOL(default_llseek); loff_t vfs_llseek(struct file *file, loff_t offset, int origin) { loff_t (*fn)(struct file *, loff_t, int); fn = no_llseek; if (file->f_mode & FMODE_LSEEK) { |
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if (file->f_op && file->f_op->llseek) fn = file->f_op->llseek; } return fn(file, offset, origin); } EXPORT_SYMBOL(vfs_llseek); |
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SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, origin) |
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{ off_t retval; struct file * file; int fput_needed; retval = -EBADF; file = fget_light(fd, &fput_needed); if (!file) goto bad; retval = -EINVAL; |
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if (origin <= SEEK_MAX) { |
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loff_t res = vfs_llseek(file, offset, origin); retval = res; if (res != (loff_t)retval) retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */ } fput_light(file, fput_needed); bad: return retval; } #ifdef __ARCH_WANT_SYS_LLSEEK |
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SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high, unsigned long, offset_low, loff_t __user *, result, unsigned int, origin) |
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{ int retval; struct file * file; loff_t offset; int fput_needed; retval = -EBADF; file = fget_light(fd, &fput_needed); if (!file) goto bad; retval = -EINVAL; |
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if (origin > SEEK_MAX) |
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goto out_putf; offset = vfs_llseek(file, ((loff_t) offset_high << 32) | offset_low, origin); retval = (int)offset; if (offset >= 0) { retval = -EFAULT; if (!copy_to_user(result, &offset, sizeof(offset))) retval = 0; } out_putf: fput_light(file, fput_needed); bad: return retval; } #endif |
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|
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/* * rw_verify_area doesn't like huge counts. We limit * them to something that fits in "int" so that others * won't have to do range checks all the time. */ |
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int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count) { struct inode *inode; loff_t pos; |
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int retval = -EINVAL; |
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|
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inode = file->f_path.dentry->d_inode; |
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if (unlikely((ssize_t) count < 0)) |
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return retval; |
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pos = *ppos; |
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if (unlikely(pos < 0)) { if (!unsigned_offsets(file)) return retval; if (count >= -pos) /* both values are in 0..LLONG_MAX */ return -EOVERFLOW; } else if (unlikely((loff_t) (pos + count) < 0)) { if (!unsigned_offsets(file)) |
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return retval; } |
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if (unlikely(inode->i_flock && mandatory_lock(inode))) { |
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retval = locks_mandatory_area( |
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read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE, inode, file, pos, count); if (retval < 0) return retval; } |
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retval = security_file_permission(file, read_write == READ ? MAY_READ : MAY_WRITE); if (retval) return retval; |
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return count > MAX_RW_COUNT ? MAX_RW_COUNT : count; |
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} |
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static void wait_on_retry_sync_kiocb(struct kiocb *iocb) { set_current_state(TASK_UNINTERRUPTIBLE); if (!kiocbIsKicked(iocb)) schedule(); else kiocbClearKicked(iocb); __set_current_state(TASK_RUNNING); } |
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ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) { |
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struct iovec iov = { .iov_base = buf, .iov_len = len }; |
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struct kiocb kiocb; ssize_t ret; init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; |
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kiocb.ki_left = len; |
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kiocb.ki_nbytes = len; |
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for (;;) { ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos); if (ret != -EIOCBRETRY) break; |
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wait_on_retry_sync_kiocb(&kiocb); |
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} |
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|
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if (-EIOCBQUEUED == ret) ret = wait_on_sync_kiocb(&kiocb); *ppos = kiocb.ki_pos; return ret; } EXPORT_SYMBOL(do_sync_read); ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) { ssize_t ret; if (!(file->f_mode & FMODE_READ)) return -EBADF; if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read)) return -EINVAL; if (unlikely(!access_ok(VERIFY_WRITE, buf, count))) return -EFAULT; ret = rw_verify_area(READ, file, pos, count); |
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if (ret >= 0) { count = ret; |
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if (file->f_op->read) ret = file->f_op->read(file, buf, count, pos); else ret = do_sync_read(file, buf, count, pos); if (ret > 0) { |
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fsnotify_access(file); |
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add_rchar(current, ret); |
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} |
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inc_syscr(current); |
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} return ret; } EXPORT_SYMBOL(vfs_read); ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) { |
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struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; |
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struct kiocb kiocb; ssize_t ret; init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; |
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kiocb.ki_left = len; |
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kiocb.ki_nbytes = len; |
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for (;;) { ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos); if (ret != -EIOCBRETRY) break; |
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wait_on_retry_sync_kiocb(&kiocb); |
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} |
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if (-EIOCBQUEUED == ret) ret = wait_on_sync_kiocb(&kiocb); *ppos = kiocb.ki_pos; return ret; } EXPORT_SYMBOL(do_sync_write); ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) { ssize_t ret; if (!(file->f_mode & FMODE_WRITE)) return -EBADF; if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write)) return -EINVAL; if (unlikely(!access_ok(VERIFY_READ, buf, count))) return -EFAULT; ret = rw_verify_area(WRITE, file, pos, count); |
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if (ret >= 0) { count = ret; |
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if (file->f_op->write) ret = file->f_op->write(file, buf, count, pos); else ret = do_sync_write(file, buf, count, pos); if (ret > 0) { |
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fsnotify_modify(file); |
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add_wchar(current, ret); |
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} |
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inc_syscw(current); |
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} return ret; } EXPORT_SYMBOL(vfs_write); static inline loff_t file_pos_read(struct file *file) { return file->f_pos; } static inline void file_pos_write(struct file *file, loff_t pos) { file->f_pos = pos; } |
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SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) |
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{ struct file *file; ssize_t ret = -EBADF; int fput_needed; file = fget_light(fd, &fput_needed); if (file) { loff_t pos = file_pos_read(file); ret = vfs_read(file, buf, count, &pos); file_pos_write(file, pos); fput_light(file, fput_needed); } return ret; } |
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SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, size_t, count) |
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{ struct file *file; ssize_t ret = -EBADF; int fput_needed; file = fget_light(fd, &fput_needed); if (file) { loff_t pos = file_pos_read(file); ret = vfs_write(file, buf, count, &pos); file_pos_write(file, pos); fput_light(file, fput_needed); } return ret; } |
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SYSCALL_DEFINE(pread64)(unsigned int fd, char __user *buf, size_t count, loff_t pos) |
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{ struct file *file; ssize_t ret = -EBADF; int fput_needed; if (pos < 0) return -EINVAL; file = fget_light(fd, &fput_needed); if (file) { ret = -ESPIPE; if (file->f_mode & FMODE_PREAD) ret = vfs_read(file, buf, count, &pos); fput_light(file, fput_needed); } return ret; } |
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#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS asmlinkage long SyS_pread64(long fd, long buf, long count, loff_t pos) { return SYSC_pread64((unsigned int) fd, (char __user *) buf, (size_t) count, pos); } SYSCALL_ALIAS(sys_pread64, SyS_pread64); #endif |
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SYSCALL_DEFINE(pwrite64)(unsigned int fd, const char __user *buf, size_t count, loff_t pos) |
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{ struct file *file; ssize_t ret = -EBADF; int fput_needed; if (pos < 0) return -EINVAL; file = fget_light(fd, &fput_needed); if (file) { ret = -ESPIPE; if (file->f_mode & FMODE_PWRITE) ret = vfs_write(file, buf, count, &pos); fput_light(file, fput_needed); } return ret; } |
6673e0c3f [CVE-2009-0029] S... |
532 533 534 535 536 537 538 539 |
#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS asmlinkage long SyS_pwrite64(long fd, long buf, long count, loff_t pos) { return SYSC_pwrite64((unsigned int) fd, (const char __user *) buf, (size_t) count, pos); } SYSCALL_ALIAS(sys_pwrite64, SyS_pwrite64); #endif |
1da177e4c Linux-2.6.12-rc2 |
540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 |
/* * Reduce an iovec's length in-place. Return the resulting number of segments */ unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to) { unsigned long seg = 0; size_t len = 0; while (seg < nr_segs) { seg++; if (len + iov->iov_len >= to) { iov->iov_len = to - len; break; } len += iov->iov_len; iov++; } return seg; } |
19295529d ext4: export iov_... |
560 |
EXPORT_SYMBOL(iov_shorten); |
1da177e4c Linux-2.6.12-rc2 |
561 |
|
ee0b3e671 [PATCH] Remove re... |
562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 |
ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov, unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn) { struct kiocb kiocb; ssize_t ret; init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; kiocb.ki_left = len; kiocb.ki_nbytes = len; for (;;) { ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos); if (ret != -EIOCBRETRY) break; wait_on_retry_sync_kiocb(&kiocb); } if (ret == -EIOCBQUEUED) ret = wait_on_sync_kiocb(&kiocb); *ppos = kiocb.ki_pos; return ret; } /* Do it by hand, with file-ops */ ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov, unsigned long nr_segs, loff_t *ppos, io_fn_t fn) { struct iovec *vector = iov; ssize_t ret = 0; while (nr_segs > 0) { void __user *base; size_t len; ssize_t nr; base = vector->iov_base; len = vector->iov_len; vector++; nr_segs--; nr = fn(filp, base, len, ppos); if (nr < 0) { if (!ret) ret = nr; break; } ret += nr; if (nr != len) break; } return ret; } |
1da177e4c Linux-2.6.12-rc2 |
617 618 |
/* A write operation does a read from user space and vice versa */ #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) |
eed4e51fb [PATCH] Add vecto... |
619 620 621 |
ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, unsigned long nr_segs, unsigned long fast_segs, struct iovec *fast_pointer, |
fcf634098 Cross Memory Attach |
622 623 |
struct iovec **ret_pointer, int check_access) |
435f49a51 readv/writev: do ... |
624 |
{ |
eed4e51fb [PATCH] Add vecto... |
625 |
unsigned long seg; |
435f49a51 readv/writev: do ... |
626 |
ssize_t ret; |
eed4e51fb [PATCH] Add vecto... |
627 |
struct iovec *iov = fast_pointer; |
435f49a51 readv/writev: do ... |
628 629 630 631 632 |
/* * SuS says "The readv() function *may* fail if the iovcnt argument * was less than or equal to 0, or greater than {IOV_MAX}. Linux has * traditionally returned zero for zero segments, so... */ |
eed4e51fb [PATCH] Add vecto... |
633 634 |
if (nr_segs == 0) { ret = 0; |
435f49a51 readv/writev: do ... |
635 |
goto out; |
eed4e51fb [PATCH] Add vecto... |
636 |
} |
435f49a51 readv/writev: do ... |
637 638 639 640 |
/* * First get the "struct iovec" from user memory and * verify all the pointers */ |
eed4e51fb [PATCH] Add vecto... |
641 642 |
if (nr_segs > UIO_MAXIOV) { ret = -EINVAL; |
435f49a51 readv/writev: do ... |
643 |
goto out; |
eed4e51fb [PATCH] Add vecto... |
644 645 |
} if (nr_segs > fast_segs) { |
435f49a51 readv/writev: do ... |
646 |
iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
eed4e51fb [PATCH] Add vecto... |
647 648 |
if (iov == NULL) { ret = -ENOMEM; |
435f49a51 readv/writev: do ... |
649 |
goto out; |
eed4e51fb [PATCH] Add vecto... |
650 |
} |
435f49a51 readv/writev: do ... |
651 |
} |
eed4e51fb [PATCH] Add vecto... |
652 653 |
if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { ret = -EFAULT; |
435f49a51 readv/writev: do ... |
654 |
goto out; |
eed4e51fb [PATCH] Add vecto... |
655 |
} |
435f49a51 readv/writev: do ... |
656 |
/* |
eed4e51fb [PATCH] Add vecto... |
657 658 659 660 |
* According to the Single Unix Specification we should return EINVAL * if an element length is < 0 when cast to ssize_t or if the * total length would overflow the ssize_t return value of the * system call. |
435f49a51 readv/writev: do ... |
661 662 663 664 |
* * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the * overflow case. */ |
eed4e51fb [PATCH] Add vecto... |
665 |
ret = 0; |
435f49a51 readv/writev: do ... |
666 667 668 |
for (seg = 0; seg < nr_segs; seg++) { void __user *buf = iov[seg].iov_base; ssize_t len = (ssize_t)iov[seg].iov_len; |
eed4e51fb [PATCH] Add vecto... |
669 670 671 |
/* see if we we're about to use an invalid len or if * it's about to overflow ssize_t */ |
435f49a51 readv/writev: do ... |
672 |
if (len < 0) { |
eed4e51fb [PATCH] Add vecto... |
673 |
ret = -EINVAL; |
435f49a51 readv/writev: do ... |
674 |
goto out; |
eed4e51fb [PATCH] Add vecto... |
675 |
} |
fcf634098 Cross Memory Attach |
676 677 |
if (check_access && unlikely(!access_ok(vrfy_dir(type), buf, len))) { |
eed4e51fb [PATCH] Add vecto... |
678 |
ret = -EFAULT; |
435f49a51 readv/writev: do ... |
679 680 681 682 683 |
goto out; } if (len > MAX_RW_COUNT - ret) { len = MAX_RW_COUNT - ret; iov[seg].iov_len = len; |
eed4e51fb [PATCH] Add vecto... |
684 |
} |
eed4e51fb [PATCH] Add vecto... |
685 |
ret += len; |
435f49a51 readv/writev: do ... |
686 |
} |
eed4e51fb [PATCH] Add vecto... |
687 688 689 690 |
out: *ret_pointer = iov; return ret; } |
1da177e4c Linux-2.6.12-rc2 |
691 692 693 694 |
static ssize_t do_readv_writev(int type, struct file *file, const struct iovec __user * uvector, unsigned long nr_segs, loff_t *pos) { |
1da177e4c Linux-2.6.12-rc2 |
695 696 |
size_t tot_len; struct iovec iovstack[UIO_FASTIOV]; |
ee0b3e671 [PATCH] Remove re... |
697 |
struct iovec *iov = iovstack; |
1da177e4c Linux-2.6.12-rc2 |
698 |
ssize_t ret; |
1da177e4c Linux-2.6.12-rc2 |
699 700 |
io_fn_t fn; iov_fn_t fnv; |
eed4e51fb [PATCH] Add vecto... |
701 702 |
if (!file->f_op) { ret = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
703 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
704 |
} |
1da177e4c Linux-2.6.12-rc2 |
705 |
|
eed4e51fb [PATCH] Add vecto... |
706 |
ret = rw_copy_check_uvector(type, uvector, nr_segs, |
fcf634098 Cross Memory Attach |
707 |
ARRAY_SIZE(iovstack), iovstack, &iov, 1); |
eed4e51fb [PATCH] Add vecto... |
708 |
if (ret <= 0) |
1da177e4c Linux-2.6.12-rc2 |
709 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
710 |
|
eed4e51fb [PATCH] Add vecto... |
711 |
tot_len = ret; |
1da177e4c Linux-2.6.12-rc2 |
712 |
ret = rw_verify_area(type, file, pos, tot_len); |
e28cc7157 Relax the rw_veri... |
713 |
if (ret < 0) |
1da177e4c Linux-2.6.12-rc2 |
714 715 716 717 718 |
goto out; fnv = NULL; if (type == READ) { fn = file->f_op->read; |
ee0b3e671 [PATCH] Remove re... |
719 |
fnv = file->f_op->aio_read; |
1da177e4c Linux-2.6.12-rc2 |
720 721 |
} else { fn = (io_fn_t)file->f_op->write; |
ee0b3e671 [PATCH] Remove re... |
722 |
fnv = file->f_op->aio_write; |
1da177e4c Linux-2.6.12-rc2 |
723 |
} |
ee0b3e671 [PATCH] Remove re... |
724 725 726 727 728 |
if (fnv) ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, pos, fnv); else ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
1da177e4c Linux-2.6.12-rc2 |
729 |
|
1da177e4c Linux-2.6.12-rc2 |
730 731 732 |
out: if (iov != iovstack) kfree(iov); |
0eeca2830 [PATCH] inotify |
733 734 |
if ((ret + (type == READ)) > 0) { if (type == READ) |
2a12a9d78 fsnotify: pass a ... |
735 |
fsnotify_access(file); |
0eeca2830 [PATCH] inotify |
736 |
else |
2a12a9d78 fsnotify: pass a ... |
737 |
fsnotify_modify(file); |
0eeca2830 [PATCH] inotify |
738 |
} |
1da177e4c Linux-2.6.12-rc2 |
739 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
740 741 742 743 744 745 746 |
} ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, unsigned long vlen, loff_t *pos) { if (!(file->f_mode & FMODE_READ)) return -EBADF; |
ee0b3e671 [PATCH] Remove re... |
747 |
if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read)) |
1da177e4c Linux-2.6.12-rc2 |
748 749 750 751 752 753 754 755 756 757 758 759 |
return -EINVAL; return do_readv_writev(READ, file, vec, vlen, pos); } EXPORT_SYMBOL(vfs_readv); ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, unsigned long vlen, loff_t *pos) { if (!(file->f_mode & FMODE_WRITE)) return -EBADF; |
ee0b3e671 [PATCH] Remove re... |
760 |
if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write)) |
1da177e4c Linux-2.6.12-rc2 |
761 762 763 764 765 766 |
return -EINVAL; return do_readv_writev(WRITE, file, vec, vlen, pos); } EXPORT_SYMBOL(vfs_writev); |
3cdad4288 [CVE-2009-0029] S... |
767 768 |
SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen) |
1da177e4c Linux-2.6.12-rc2 |
769 770 771 772 773 774 775 776 777 778 779 780 781 782 |
{ struct file *file; ssize_t ret = -EBADF; int fput_needed; file = fget_light(fd, &fput_needed); if (file) { loff_t pos = file_pos_read(file); ret = vfs_readv(file, vec, vlen, &pos); file_pos_write(file, pos); fput_light(file, fput_needed); } if (ret > 0) |
4b98d11b4 [PATCH] ifdef ->r... |
783 784 |
add_rchar(current, ret); inc_syscr(current); |
1da177e4c Linux-2.6.12-rc2 |
785 786 |
return ret; } |
3cdad4288 [CVE-2009-0029] S... |
787 788 |
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, unsigned long, vlen) |
1da177e4c Linux-2.6.12-rc2 |
789 790 791 792 793 794 795 796 797 798 799 800 801 802 |
{ struct file *file; ssize_t ret = -EBADF; int fput_needed; file = fget_light(fd, &fput_needed); if (file) { loff_t pos = file_pos_read(file); ret = vfs_writev(file, vec, vlen, &pos); file_pos_write(file, pos); fput_light(file, fput_needed); } if (ret > 0) |
4b98d11b4 [PATCH] ifdef ->r... |
803 804 |
add_wchar(current, ret); inc_syscw(current); |
1da177e4c Linux-2.6.12-rc2 |
805 806 |
return ret; } |
601cc11d0 Make non-compat p... |
807 808 809 810 811 |
static inline loff_t pos_from_hilo(unsigned long high, unsigned long low) { #define HALF_LONG_BITS (BITS_PER_LONG / 2) return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low; } |
f3554f4bc preadv/pwritev: A... |
812 |
SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, |
601cc11d0 Make non-compat p... |
813 |
unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) |
f3554f4bc preadv/pwritev: A... |
814 |
{ |
601cc11d0 Make non-compat p... |
815 |
loff_t pos = pos_from_hilo(pos_h, pos_l); |
f3554f4bc preadv/pwritev: A... |
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 |
struct file *file; ssize_t ret = -EBADF; int fput_needed; if (pos < 0) return -EINVAL; file = fget_light(fd, &fput_needed); if (file) { ret = -ESPIPE; if (file->f_mode & FMODE_PREAD) ret = vfs_readv(file, vec, vlen, &pos); fput_light(file, fput_needed); } if (ret > 0) add_rchar(current, ret); inc_syscr(current); return ret; } SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, |
601cc11d0 Make non-compat p... |
838 |
unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) |
f3554f4bc preadv/pwritev: A... |
839 |
{ |
601cc11d0 Make non-compat p... |
840 |
loff_t pos = pos_from_hilo(pos_h, pos_l); |
f3554f4bc preadv/pwritev: A... |
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 |
struct file *file; ssize_t ret = -EBADF; int fput_needed; if (pos < 0) return -EINVAL; file = fget_light(fd, &fput_needed); if (file) { ret = -ESPIPE; if (file->f_mode & FMODE_PWRITE) ret = vfs_writev(file, vec, vlen, &pos); fput_light(file, fput_needed); } if (ret > 0) add_wchar(current, ret); inc_syscw(current); return ret; } |
1da177e4c Linux-2.6.12-rc2 |
861 862 863 864 865 866 867 |
static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, size_t count, loff_t max) { struct file * in_file, * out_file; struct inode * in_inode, * out_inode; loff_t pos; ssize_t retval; |
534f2aaa6 sys_sendfile: swi... |
868 |
int fput_needed_in, fput_needed_out, fl; |
1da177e4c Linux-2.6.12-rc2 |
869 870 871 872 873 874 875 876 877 878 |
/* * Get input file, and verify that it is ok.. */ retval = -EBADF; in_file = fget_light(in_fd, &fput_needed_in); if (!in_file) goto out; if (!(in_file->f_mode & FMODE_READ)) goto fput_in; |
1da177e4c Linux-2.6.12-rc2 |
879 880 881 882 883 884 885 |
retval = -ESPIPE; if (!ppos) ppos = &in_file->f_pos; else if (!(in_file->f_mode & FMODE_PREAD)) goto fput_in; retval = rw_verify_area(READ, in_file, ppos, count); |
e28cc7157 Relax the rw_veri... |
886 |
if (retval < 0) |
1da177e4c Linux-2.6.12-rc2 |
887 |
goto fput_in; |
e28cc7157 Relax the rw_veri... |
888 |
count = retval; |
1da177e4c Linux-2.6.12-rc2 |
889 |
|
1da177e4c Linux-2.6.12-rc2 |
890 891 892 893 894 895 896 897 898 899 |
/* * Get output file, and verify that it is ok.. */ retval = -EBADF; out_file = fget_light(out_fd, &fput_needed_out); if (!out_file) goto fput_in; if (!(out_file->f_mode & FMODE_WRITE)) goto fput_out; retval = -EINVAL; |
6818173bd splice: implement... |
900 |
in_inode = in_file->f_path.dentry->d_inode; |
0f7fc9e4d [PATCH] VFS: chan... |
901 |
out_inode = out_file->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
902 |
retval = rw_verify_area(WRITE, out_file, &out_file->f_pos, count); |
e28cc7157 Relax the rw_veri... |
903 |
if (retval < 0) |
1da177e4c Linux-2.6.12-rc2 |
904 |
goto fput_out; |
e28cc7157 Relax the rw_veri... |
905 |
count = retval; |
1da177e4c Linux-2.6.12-rc2 |
906 |
|
1da177e4c Linux-2.6.12-rc2 |
907 908 909 910 |
if (!max) max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); pos = *ppos; |
1da177e4c Linux-2.6.12-rc2 |
911 912 913 914 915 916 |
if (unlikely(pos + count > max)) { retval = -EOVERFLOW; if (pos >= max) goto fput_out; count = max - pos; } |
d96e6e716 Remove remnants o... |
917 |
fl = 0; |
534f2aaa6 sys_sendfile: swi... |
918 |
#if 0 |
d96e6e716 Remove remnants o... |
919 920 921 922 923 924 925 926 |
/* * We need to debate whether we can enable this or not. The * man page documents EAGAIN return for the output at least, * and the application is arguably buggy if it doesn't expect * EAGAIN on a non-blocking file descriptor. */ if (in_file->f_flags & O_NONBLOCK) fl = SPLICE_F_NONBLOCK; |
534f2aaa6 sys_sendfile: swi... |
927 |
#endif |
d96e6e716 Remove remnants o... |
928 |
retval = do_splice_direct(in_file, ppos, out_file, count, fl); |
1da177e4c Linux-2.6.12-rc2 |
929 930 |
if (retval > 0) { |
4b98d11b4 [PATCH] ifdef ->r... |
931 932 |
add_rchar(current, retval); add_wchar(current, retval); |
1da177e4c Linux-2.6.12-rc2 |
933 |
} |
1da177e4c Linux-2.6.12-rc2 |
934 |
|
4b98d11b4 [PATCH] ifdef ->r... |
935 936 |
inc_syscr(current); inc_syscw(current); |
1da177e4c Linux-2.6.12-rc2 |
937 938 939 940 941 942 943 944 945 946 |
if (*ppos > max) retval = -EOVERFLOW; fput_out: fput_light(out_file, fput_needed_out); fput_in: fput_light(in_file, fput_needed_in); out: return retval; } |
002c8976e [CVE-2009-0029] S... |
947 |
SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, size_t, count) |
1da177e4c Linux-2.6.12-rc2 |
948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 |
{ loff_t pos; off_t off; ssize_t ret; if (offset) { if (unlikely(get_user(off, offset))) return -EFAULT; pos = off; ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); if (unlikely(put_user(pos, offset))) return -EFAULT; return ret; } return do_sendfile(out_fd, in_fd, NULL, count, 0); } |
002c8976e [CVE-2009-0029] S... |
965 |
SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count) |
1da177e4c Linux-2.6.12-rc2 |
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 |
{ loff_t pos; ssize_t ret; if (offset) { if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) return -EFAULT; ret = do_sendfile(out_fd, in_fd, &pos, count, 0); if (unlikely(put_user(pos, offset))) return -EFAULT; return ret; } return do_sendfile(out_fd, in_fd, NULL, count, 0); } |