mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-12-28 16:56:26 +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>
106 lines
3.5 KiB
C
106 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __UM_FS_HOSTFS
|
|
#define __UM_FS_HOSTFS
|
|
|
|
#include <os.h>
|
|
|
|
/*
|
|
* These are exactly the same definitions as in fs.h, but the names are
|
|
* changed so that this file can be included in both kernel and user files.
|
|
*/
|
|
|
|
#define HOSTFS_ATTR_MODE 1
|
|
#define HOSTFS_ATTR_UID 2
|
|
#define HOSTFS_ATTR_GID 4
|
|
#define HOSTFS_ATTR_SIZE 8
|
|
#define HOSTFS_ATTR_ATIME 16
|
|
#define HOSTFS_ATTR_MTIME 32
|
|
#define HOSTFS_ATTR_CTIME 64
|
|
#define HOSTFS_ATTR_ATIME_SET 128
|
|
#define HOSTFS_ATTR_MTIME_SET 256
|
|
|
|
/* This one is unused by hostfs. */
|
|
#define HOSTFS_ATTR_FORCE 512 /* Not a change, but a change it */
|
|
#define HOSTFS_ATTR_ATTR_FLAG 1024
|
|
|
|
/*
|
|
* If you are very careful, you'll notice that these two are missing:
|
|
*
|
|
* #define ATTR_KILL_SUID 2048
|
|
* #define ATTR_KILL_SGID 4096
|
|
*
|
|
* and this is because they were added in 2.5 development.
|
|
* Actually, they are not needed by most ->setattr() methods - they are set by
|
|
* callers of notify_change() to notify that the setuid/setgid bits must be
|
|
* dropped.
|
|
* notify_change() will delete those flags, make sure attr->ia_valid & ATTR_MODE
|
|
* is on, and remove the appropriate bits from attr->ia_mode (attr is a
|
|
* "struct iattr *"). -BlaisorBlade
|
|
*/
|
|
struct hostfs_timespec {
|
|
long long tv_sec;
|
|
long long tv_nsec;
|
|
};
|
|
|
|
struct hostfs_iattr {
|
|
unsigned int ia_valid;
|
|
unsigned short ia_mode;
|
|
uid_t ia_uid;
|
|
gid_t ia_gid;
|
|
loff_t ia_size;
|
|
struct hostfs_timespec ia_atime;
|
|
struct hostfs_timespec ia_mtime;
|
|
struct hostfs_timespec ia_ctime;
|
|
};
|
|
|
|
struct hostfs_stat {
|
|
unsigned long long ino;
|
|
unsigned int mode;
|
|
unsigned int nlink;
|
|
unsigned int uid;
|
|
unsigned int gid;
|
|
unsigned long long size;
|
|
struct hostfs_timespec atime, mtime, ctime;
|
|
unsigned int blksize;
|
|
unsigned long long blocks;
|
|
struct {
|
|
unsigned int maj;
|
|
unsigned int min;
|
|
} rdev, dev;
|
|
};
|
|
|
|
extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
|
|
extern int access_file(char *path, int r, int w, int x);
|
|
extern int open_file(char *path, int r, int w, int append);
|
|
extern void *open_dir(char *path, int *err_out);
|
|
extern void seek_dir(void *stream, unsigned long long pos);
|
|
extern char *read_dir(void *stream, unsigned long long *pos_out,
|
|
unsigned long long *ino_out, int *len_out,
|
|
unsigned int *type_out);
|
|
extern void close_file(void *stream);
|
|
extern int replace_file(int oldfd, int fd);
|
|
extern void close_dir(void *stream);
|
|
extern int read_file(int fd, unsigned long long *offset, char *buf, int len);
|
|
extern int write_file(int fd, unsigned long long *offset, const char *buf,
|
|
int len);
|
|
extern int lseek_file(int fd, long long offset, int whence);
|
|
extern int fsync_file(int fd, int datasync);
|
|
extern int file_create(char *name, int mode);
|
|
extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
|
|
extern int make_symlink(const char *from, const char *to);
|
|
extern int unlink_file(const char *file);
|
|
extern int do_mkdir(const char *file, int mode);
|
|
extern int hostfs_do_rmdir(const char *file);
|
|
extern int do_mknod(const char *file, int mode, unsigned int major,
|
|
unsigned int minor);
|
|
extern int link_file(const char *to, const char *from);
|
|
extern int hostfs_do_readlink(char *file, char *buf, int size);
|
|
extern int rename_file(char *from, char *to);
|
|
extern int rename2_file(char *from, char *to, unsigned int flags);
|
|
extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
|
|
long long *bfree_out, long long *bavail_out,
|
|
long long *files_out, long long *ffree_out,
|
|
void *fsid_out, int fsid_size, long *namelen_out);
|
|
|
|
#endif
|