mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
267ed02c21
dev_t is a kernel type and may have different definitions
in kernel and userspace. On 32-bit x86 this currently makes
the stat structure being 4 bytes longer in the user code,
causing stack corruption.
However, this is (potentially) not the only problem, since
dev_t is a different type on user/kernel side, so we don't
know that the major/minor encoding isn't also different.
Decode/encode it instead to address both problems.
Cc: stable@vger.kernel.org
Fixes: 74ce793bcb ("hostfs: Fix ephemeral inodes")
Link: https://patch.msgid.link/20240702092440.acc960585dd5.Id0767e12f562a69c6cd3c3262dc3d765db350cf6@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
412 lines
7.4 KiB
C
412 lines
7.4 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/vfs.h>
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#include <sys/syscall.h>
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#include "hostfs.h"
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#include <utime.h>
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static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p)
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{
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p->ino = buf->st_ino;
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p->mode = buf->st_mode;
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p->nlink = buf->st_nlink;
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p->uid = buf->st_uid;
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p->gid = buf->st_gid;
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p->size = buf->st_size;
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p->atime.tv_sec = buf->st_atime;
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p->atime.tv_nsec = 0;
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p->ctime.tv_sec = buf->st_ctime;
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p->ctime.tv_nsec = 0;
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p->mtime.tv_sec = buf->st_mtime;
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p->mtime.tv_nsec = 0;
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p->blksize = buf->st_blksize;
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p->blocks = buf->st_blocks;
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p->rdev.maj = os_major(buf->st_rdev);
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p->rdev.min = os_minor(buf->st_rdev);
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p->dev.maj = os_major(buf->st_dev);
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p->dev.min = os_minor(buf->st_dev);
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}
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int stat_file(const char *path, struct hostfs_stat *p, int fd)
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{
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struct stat64 buf;
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if (fd >= 0) {
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if (fstat64(fd, &buf) < 0)
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return -errno;
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} else if (lstat64(path, &buf) < 0) {
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return -errno;
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}
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stat64_to_hostfs(&buf, p);
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return 0;
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}
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int access_file(char *path, int r, int w, int x)
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{
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int mode = 0;
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if (r)
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mode = R_OK;
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if (w)
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mode |= W_OK;
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if (x)
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mode |= X_OK;
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if (access(path, mode) != 0)
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return -errno;
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else return 0;
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}
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int open_file(char *path, int r, int w, int append)
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{
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int mode = 0, fd;
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if (r && !w)
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mode = O_RDONLY;
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else if (!r && w)
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mode = O_WRONLY;
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else if (r && w)
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mode = O_RDWR;
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else panic("Impossible mode in open_file");
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if (append)
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mode |= O_APPEND;
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fd = open64(path, mode);
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if (fd < 0)
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return -errno;
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else return fd;
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}
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void *open_dir(char *path, int *err_out)
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{
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DIR *dir;
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dir = opendir(path);
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*err_out = errno;
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return dir;
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}
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void seek_dir(void *stream, unsigned long long pos)
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{
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DIR *dir = stream;
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seekdir(dir, pos);
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}
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char *read_dir(void *stream, unsigned long long *pos_out,
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unsigned long long *ino_out, int *len_out,
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unsigned int *type_out)
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{
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DIR *dir = stream;
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struct dirent *ent;
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ent = readdir(dir);
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if (ent == NULL)
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return NULL;
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*len_out = strlen(ent->d_name);
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*ino_out = ent->d_ino;
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*type_out = ent->d_type;
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*pos_out = ent->d_off;
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return ent->d_name;
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}
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int read_file(int fd, unsigned long long *offset, char *buf, int len)
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{
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int n;
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n = pread64(fd, buf, len, *offset);
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if (n < 0)
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return -errno;
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*offset += n;
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return n;
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}
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int write_file(int fd, unsigned long long *offset, const char *buf, int len)
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{
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int n;
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n = pwrite64(fd, buf, len, *offset);
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if (n < 0)
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return -errno;
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*offset += n;
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return n;
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}
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int lseek_file(int fd, long long offset, int whence)
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{
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int ret;
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ret = lseek64(fd, offset, whence);
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if (ret < 0)
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return -errno;
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return 0;
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}
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int fsync_file(int fd, int datasync)
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{
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int ret;
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if (datasync)
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ret = fdatasync(fd);
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else
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ret = fsync(fd);
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if (ret < 0)
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return -errno;
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return 0;
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}
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int replace_file(int oldfd, int fd)
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{
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return dup2(oldfd, fd);
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}
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void close_file(void *stream)
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{
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close(*((int *) stream));
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}
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void close_dir(void *stream)
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{
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closedir(stream);
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}
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int file_create(char *name, int mode)
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{
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int fd;
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fd = open64(name, O_CREAT | O_RDWR, mode);
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if (fd < 0)
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return -errno;
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return fd;
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}
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int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
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{
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struct hostfs_stat st;
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struct timeval times[2];
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int err, ma;
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if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
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if (fd >= 0) {
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if (fchmod(fd, attrs->ia_mode) != 0)
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return -errno;
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} else if (chmod(file, attrs->ia_mode) != 0) {
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return -errno;
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}
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}
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if (attrs->ia_valid & HOSTFS_ATTR_UID) {
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if (fd >= 0) {
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if (fchown(fd, attrs->ia_uid, -1))
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return -errno;
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} else if (chown(file, attrs->ia_uid, -1)) {
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return -errno;
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}
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}
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if (attrs->ia_valid & HOSTFS_ATTR_GID) {
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if (fd >= 0) {
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if (fchown(fd, -1, attrs->ia_gid))
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return -errno;
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} else if (chown(file, -1, attrs->ia_gid)) {
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return -errno;
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}
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}
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if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
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if (fd >= 0) {
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if (ftruncate(fd, attrs->ia_size))
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return -errno;
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} else if (truncate(file, attrs->ia_size)) {
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return -errno;
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}
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}
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/*
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* Update accessed and/or modified time, in two parts: first set
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* times according to the changes to perform, and then call futimes()
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* or utimes() to apply them.
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*/
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ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
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if (attrs->ia_valid & ma) {
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err = stat_file(file, &st, fd);
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if (err != 0)
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return err;
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times[0].tv_sec = st.atime.tv_sec;
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times[0].tv_usec = st.atime.tv_nsec / 1000;
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times[1].tv_sec = st.mtime.tv_sec;
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times[1].tv_usec = st.mtime.tv_nsec / 1000;
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if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
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times[0].tv_sec = attrs->ia_atime.tv_sec;
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times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
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}
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if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
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times[1].tv_sec = attrs->ia_mtime.tv_sec;
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times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
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}
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if (fd >= 0) {
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if (futimes(fd, times) != 0)
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return -errno;
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} else if (utimes(file, times) != 0) {
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return -errno;
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}
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}
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/* Note: ctime is not handled */
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if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
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err = stat_file(file, &st, fd);
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attrs->ia_atime = st.atime;
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attrs->ia_mtime = st.mtime;
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if (err != 0)
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return err;
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}
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return 0;
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}
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int make_symlink(const char *from, const char *to)
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{
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int err;
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err = symlink(to, from);
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if (err)
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return -errno;
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return 0;
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}
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int unlink_file(const char *file)
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{
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int err;
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err = unlink(file);
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if (err)
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return -errno;
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return 0;
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}
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int do_mkdir(const char *file, int mode)
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{
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int err;
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err = mkdir(file, mode);
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if (err)
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return -errno;
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return 0;
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}
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int hostfs_do_rmdir(const char *file)
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{
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int err;
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err = rmdir(file);
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if (err)
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return -errno;
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return 0;
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}
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int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
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{
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int err;
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err = mknod(file, mode, os_makedev(major, minor));
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if (err)
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return -errno;
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return 0;
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}
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int link_file(const char *to, const char *from)
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{
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int err;
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err = link(to, from);
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if (err)
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return -errno;
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return 0;
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}
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int hostfs_do_readlink(char *file, char *buf, int size)
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{
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int n;
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n = readlink(file, buf, size);
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if (n < 0)
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return -errno;
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if (n < size)
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buf[n] = '\0';
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return n;
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}
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int rename_file(char *from, char *to)
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{
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int err;
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err = rename(from, to);
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if (err < 0)
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return -errno;
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return 0;
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}
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int rename2_file(char *from, char *to, unsigned int flags)
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{
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int err;
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#ifndef SYS_renameat2
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# ifdef __x86_64__
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# define SYS_renameat2 316
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# endif
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# ifdef __i386__
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# define SYS_renameat2 353
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# endif
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#endif
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#ifdef SYS_renameat2
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err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags);
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if (err < 0) {
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if (errno != ENOSYS)
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return -errno;
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else
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return -EINVAL;
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}
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return 0;
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#else
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return -EINVAL;
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#endif
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}
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int do_statfs(char *root, long *bsize_out, long long *blocks_out,
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long long *bfree_out, long long *bavail_out,
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long long *files_out, long long *ffree_out,
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void *fsid_out, int fsid_size, long *namelen_out)
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{
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struct statfs64 buf;
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int err;
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err = statfs64(root, &buf);
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if (err < 0)
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return -errno;
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*bsize_out = buf.f_bsize;
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*blocks_out = buf.f_blocks;
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*bfree_out = buf.f_bfree;
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*bavail_out = buf.f_bavail;
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*files_out = buf.f_files;
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*ffree_out = buf.f_ffree;
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memcpy(fsid_out, &buf.f_fsid,
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sizeof(buf.f_fsid) > fsid_size ? fsid_size :
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sizeof(buf.f_fsid));
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*namelen_out = buf.f_namelen;
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return 0;
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}
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