kybaaz/linux-xiaomi-chiron
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

a couple of fixes, one of them for this cycle regression...

Browse source 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
 -----BEGIN PGP SIGNATURE-----
 
 iHUEABYIAB0WIQQqUNBr3gm4hGXdBJlZ7Krx/gZQ6wUCY4A7qAAKCRBZ7Krx/gZQ
 61SoAP9bWYuW44RNEkitOIPCi/bmWy5D9alVEjWinmxzsT94NgEA5rfc4uuSCLp1
 se+Qgcu5iNKpHTXIOAOX7ozCCQJzQgo=
 =GK/t
 -----END PGP SIGNATURE-----

Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs fixes from Al Viro:
 "A couple of fixes, one of them for this cycle regression..."

* tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  vfs: vfs_tmpfile: ensure O_EXCL flag is enforced
  fs: use acquire ordering in __fget_light()
This commit is contained in:
Linus Torvalds 2022-11-25 10:12:43 -08:00
commit b308570957
2 changed files with 12 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

11
fs/file.c
View file

@ -1003,7 +1003,16 @@ static unsigned long __fget_light(unsigned int fd, fmode_t mask)
struct files_struct *files = current->files;
struct file *file;
if (atomic_read(&files->count) == 1) {
/*
* If another thread is concurrently calling close_fd() followed
* by put_files_struct(), we must not observe the old table
* entry combined with the new refcount - otherwise we could
* return a file that is concurrently being freed.
*
* atomic_read_acquire() pairs with atomic_dec_and_test() in
* put_files_struct().
*/
if (atomic_read_acquire(&files->count) == 1) {
file = files_lookup_fd_raw(files, fd);
if (!file || unlikely(file->f_mode & mask))
return 0;

3
fs/namei.c
View file

@ -3591,6 +3591,7 @@ static int vfs_tmpfile(struct user_namespace *mnt_userns,
struct inode *dir = d_inode(parentpath->dentry);
struct inode *inode;
int error;
int open_flag = file->f_flags;
/* we want directory to be writable */
error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
@ -3613,7 +3614,7 @@ static int vfs_tmpfile(struct user_namespace *mnt_userns,
if (error)
return error;
inode = file_inode(file);
if (!(file->f_flags & O_EXCL)) {
if (!(open_flag & O_EXCL)) {
spin_lock(&inode->i_lock);
inode->i_state |= I_LINKABLE;
spin_unlock(&inode->i_lock);