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pass creds to get_empty_filp(), make sure dentry_open() passes the right creds

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... and rename get_empty_filp() to alloc_empty_file().

dentry_open() gets creds as argument, but the only thing that sees those is
security_file_open() - file->f_cred still ends up with current_cred().  For
almost all callers it's the same thing, but there are several broken cases.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-07-10 13:12:05 -04:00
parent c9c554f214
commit 6de37b6dc0
4 changed files with 5 additions and 6 deletions
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5
fs/file_table.c
View File

@ -101,9 +101,8 @@ int proc_nr_files(struct ctl_table *table, int write,
* done, you will imbalance int the mount's writer count
* and a warning at __fput() time.
*/
struct file *get_empty_filp(void)
struct file *alloc_empty_file(const struct cred *cred)
{
const struct cred *cred = current_cred();
static long old_max;
struct file *f;
int error;
@ -161,7 +160,7 @@ struct file *alloc_file(const struct path *path, int flags,
{
struct file *file;
file = get_empty_filp();
file = alloc_empty_file(current_cred());
if (IS_ERR(file))
return file;

2
fs/internal.h
View File

@ -93,7 +93,7 @@ extern void chroot_fs_refs(const struct path *, const struct path *);
/*
* file_table.c
*/
extern struct file *get_empty_filp(void);
extern struct file *alloc_empty_file(const struct cred *);
/*
* super.c

2
fs/namei.c
View File

@ -3513,7 +3513,7 @@ static struct file *path_openat(struct nameidata *nd,
int opened = 0;
int error;
file = get_empty_filp();
file = alloc_empty_file(current_cred());
if (IS_ERR(file))
return file;

2
fs/open.c
View File

@ -921,7 +921,7 @@ struct file *dentry_open(const struct path *path, int flags,
/* We must always pass in a valid mount pointer. */
BUG_ON(!path->mnt);
f = get_empty_filp();
f = alloc_empty_file(cred);
if (!IS_ERR(f)) {
f->f_flags = flags;
error = vfs_open(path, f, cred);