Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

ANDROID: vfs: Add setattr2 for filesystems with per mount permissions

Browse source 
This allows filesystems to use their mount private data to
influence the permssions they use in setattr2. It has
been separated into a new call to avoid disrupting current
setattr users.

Change-Id: I19959038309284448f1b7f232d579674ef546385
Signed-off-by: Daniel Rosenberg <drosen@google.com>
This commit is contained in:
Daniel Rosenberg 2016-10-26 16:33:11 -07:00 committed by Amit Pundir
parent 5d212327f0
commit 45c410859e
7 changed files with 35 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
fs/attr.c
View file

@ -223,7 +223,7 @@ EXPORT_SYMBOL(setattr_copy);
* the file open for write, as there can be no conflicting delegation in
* that case.
*/
int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)
int notify_change2(struct vfsmount *mnt, struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)
{
struct inode *inode = dentry->d_inode;
umode_t mode = inode->i_mode;
@ -330,7 +330,9 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de
if (error)
return error;
if (inode->i_op->setattr)
if (mnt && inode->i_op->setattr2)
error = inode->i_op->setattr2(mnt, dentry, attr);
else if (inode->i_op->setattr)
error = inode->i_op->setattr(dentry, attr);
else
error = simple_setattr(dentry, attr);
@ -343,4 +345,10 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de
return error;
}
EXPORT_SYMBOL(notify_change2);
int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)
{
return notify_change2(NULL, dentry, attr, delegated_inode);
}
EXPORT_SYMBOL(notify_change);

2
fs/coredump.c
View file

@ -742,7 +742,7 @@ void do_coredump(const siginfo_t *siginfo)
goto close_fail;
if (!(cprm.file->f_mode & FMODE_CAN_WRITE))
goto close_fail;
if (do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file))
if (do_truncate2(cprm.file->f_path.mnt, cprm.file->f_path.dentry, 0, 0, cprm.file))
goto close_fail;
}

6
fs/inode.c
View file

@ -1794,7 +1794,7 @@ int dentry_needs_remove_privs(struct dentry *dentry)
return mask;
}
static int __remove_privs(struct dentry *dentry, int kill)
static int __remove_privs(struct vfsmount *mnt, struct dentry *dentry, int kill)
{
struct iattr newattrs;
@ -1803,7 +1803,7 @@ static int __remove_privs(struct dentry *dentry, int kill)
* Note we call this on write, so notify_change will not
* encounter any conflicting delegations:
*/
return notify_change(dentry, &newattrs, NULL);
return notify_change2(mnt, dentry, &newattrs, NULL);
}
/*
@ -1825,7 +1825,7 @@ int file_remove_privs(struct file *file)
if (kill < 0)
return kill;
if (kill)
error = __remove_privs(dentry, kill);
error = __remove_privs(file->f_path.mnt, dentry, kill);
if (!error)
inode_has_no_xattr(inode);

2
fs/namei.c
View file

@ -3005,7 +3005,7 @@ static int handle_truncate(struct file *filp)
if (!error)
error = security_path_truncate(path);
if (!error) {
error = do_truncate(path->dentry, 0,
error = do_truncate2(path->mnt, path->dentry, 0,
ATTR_MTIME|ATTR_CTIME|ATTR_OPEN,
filp);
}

21
fs/open.c
View file

@ -34,8 +34,8 @@
#include "internal.h"
int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
struct file *filp)
int do_truncate2(struct vfsmount *mnt, struct dentry *dentry, loff_t length,
unsigned int time_attrs, struct file *filp)
{
int ret;
struct iattr newattrs;
@ -60,10 +60,15 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
inode_lock(dentry->d_inode);
/* Note any delegations or leases have already been broken: */
ret = notify_change(dentry, &newattrs, NULL);
ret = notify_change2(mnt, dentry, &newattrs, NULL);
inode_unlock(dentry->d_inode);
return ret;
}
int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
struct file *filp)
{
return do_truncate2(NULL, dentry, length, time_attrs, filp);
}
long vfs_truncate(const struct path *path, loff_t length)
{
@ -106,7 +111,7 @@ long vfs_truncate(const struct path *path, loff_t length)
if (!error)
error = security_path_truncate(path);
if (!error)
error = do_truncate(path->dentry, length, 0, NULL);
error = do_truncate2(mnt, path->dentry, length, 0, NULL);
put_write_and_out:
put_write_access(inode);
@ -155,6 +160,7 @@ long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
{
struct inode *inode;
struct dentry *dentry;
struct vfsmount *mnt;
struct fd f;
int error;
@ -171,6 +177,7 @@ long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
small = 0;
dentry = f.file->f_path.dentry;
mnt = f.file->f_path.mnt;
inode = dentry->d_inode;
error = -EINVAL;
if (!S_ISREG(inode->i_mode) || !(f.file->f_mode & FMODE_WRITE))
@ -191,7 +198,7 @@ long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
if (!error)
error = security_path_truncate(&f.file->f_path);
if (!error)
error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, f.file);
error = do_truncate2(mnt, dentry, length, ATTR_MTIME|ATTR_CTIME, f.file);
sb_end_write(inode->i_sb);
out_putf:
fdput(f);
@ -538,7 +545,7 @@ static int chmod_common(const struct path *path, umode_t mode)
goto out_unlock;
newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
error = notify_change(path->dentry, &newattrs, &delegated_inode);
error = notify_change2(path->mnt, path->dentry, &newattrs, &delegated_inode);
out_unlock:
inode_unlock(inode);
if (delegated_inode) {
@ -629,7 +636,7 @@ static int chown_common(const struct path *path, uid_t user, gid_t group)
inode_lock(inode);
error = security_path_chown(path, uid, gid);
if (!error)
error = notify_change(path->dentry, &newattrs, &delegated_inode);
error = notify_change2(path->mnt, path->dentry, &newattrs, &delegated_inode);
inode_unlock(inode);
if (delegated_inode) {
error = break_deleg_wait(&delegated_inode);

2
fs/utimes.c
View file

@ -88,7 +88,7 @@ static int utimes_common(const struct path *path, struct timespec64 *times)
}
retry_deleg:
inode_lock(inode);
error = notify_change(path->dentry, &newattrs, &delegated_inode);
error = notify_change2(path->mnt, path->dentry, &newattrs, &delegated_inode);
inode_unlock(inode);
if (delegated_inode) {
error = break_deleg_wait(&delegated_inode);

4
include/linux/fs.h
View file

@ -1783,6 +1783,7 @@ struct inode_operations {
int (*rename) (struct inode *, struct dentry *,
struct inode *, struct dentry *, unsigned int);
int (*setattr) (struct dentry *, struct iattr *);
int (*setattr2) (struct vfsmount *, struct dentry *, struct iattr *);
int (*getattr) (const struct path *, struct kstat *, u32, unsigned int);
ssize_t (*listxattr) (struct dentry *, char *, size_t);
int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
@ -2440,6 +2441,8 @@ struct filename {
extern long vfs_truncate(const struct path *, loff_t);
extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
struct file *filp);
extern int do_truncate2(struct vfsmount *, struct dentry *, loff_t start,
unsigned int time_attrs, struct file *filp);
extern int vfs_fallocate(struct file *file, int mode, loff_t offset,
loff_t len);
extern long do_sys_open(int dfd, const char __user *filename, int flags,
@ -2749,6 +2752,7 @@ extern void emergency_remount(void);
extern sector_t bmap(struct inode *, sector_t);
#endif
extern int notify_change(struct dentry *, struct iattr *, struct inode **);
extern int notify_change2(struct vfsmount *, struct dentry *, struct iattr *, struct inode **);
extern int inode_permission(struct inode *, int);
extern int generic_permission(struct inode *, int);
extern int __check_sticky(struct inode *dir, struct inode *inode);