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vfs: splice remove_suid() cleanup

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generic_file_splice_write() duplicates remove_suid() just because it
doesn't hold i_mutex.  But it grabs i_mutex inside splice_from_pipe()
anyway, so this is rather pointless.

Move locking to generic_file_splice_write() and call remove_suid() and
__splice_from_pipe() instead.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Miklos Szeredi 2008-05-07 09:22:39 +02:00 committed by Jens Axboe
parent 07416d29bc
commit 7f3d4ee108
3 changed files with 14 additions and 18 deletions
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29
fs/splice.c
View file

@ -811,24 +811,19 @@ generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
{
struct address_space *mapping = out->f_mapping;
struct inode *inode = mapping->host;
int killsuid, killpriv;
struct splice_desc sd = {
.total_len = len,
.flags = flags,
.pos = *ppos,
.u.file = out,
};
ssize_t ret;
int err = 0;
killpriv = security_inode_need_killpriv(out->f_path.dentry);
killsuid = should_remove_suid(out->f_path.dentry);
if (unlikely(killsuid || killpriv)) {
mutex_lock(&inode->i_mutex);
if (killpriv)
err = security_inode_killpriv(out->f_path.dentry);
if (!err && killsuid)
err = __remove_suid(out->f_path.dentry, killsuid);
mutex_unlock(&inode->i_mutex);
if (err)
return err;
}
ret = splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_file);
inode_double_lock(inode, pipe->inode);
ret = remove_suid(out->f_path.dentry);
if (likely(!ret))
ret = __splice_from_pipe(pipe, &sd, pipe_to_file);
inode_double_unlock(inode, pipe->inode);
if (ret > 0) {
unsigned long nr_pages;
@ -840,6 +835,8 @@ generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
* sync it.
*/
if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) {
int err;
mutex_lock(&inode->i_mutex);
err = generic_osync_inode(inode, mapping,
OSYNC_METADATA|OSYNC_DATA);

1
include/linux/fs.h
View file

@ -1816,7 +1816,6 @@ extern void iget_failed(struct inode *);
extern void clear_inode(struct inode *);
extern void destroy_inode(struct inode *);
extern struct inode *new_inode(struct super_block *);
extern int __remove_suid(struct dentry *, int);
extern int should_remove_suid(struct dentry *);
extern int remove_suid(struct dentry *);

2
mm/filemap.c
View file

@ -1655,7 +1655,7 @@ int should_remove_suid(struct dentry *dentry)
}
EXPORT_SYMBOL(should_remove_suid);
int __remove_suid(struct dentry *dentry, int kill)
static int __remove_suid(struct dentry *dentry, int kill)
{
struct iattr newattrs;