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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse Source 
Pull misc vfs fixes from Al Viro:
 "Assorted fixes all over the place; some of that is -stable fodder,
  some regressions from the last window"

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ecryptfs_lookup_interpose(): lower_dentry->d_parent is not stable either
  ecryptfs_lookup_interpose(): lower_dentry->d_inode is not stable
  ecryptfs: fix unlink and rmdir in face of underlying fs modifications
  audit_get_nd(): don't unlock parent too early
  exportfs_decode_fh(): negative pinned may become positive without the parent locked
  cgroup: don't put ERR_PTR() into fc->root
  autofs: fix a leak in autofs_expire_indirect()
  aio: Fix io_pgetevents() struct __compat_aio_sigset layout
  fs/namespace.c: fix use-after-free of mount in mnt_warn_timestamp_expiry()
This commit is contained in:
Linus Torvalds 2019-11-15 08:44:08 -08:00
commit b4c0800e42
7 changed files with 91 additions and 61 deletions
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10
fs/aio.c
View File

@ -2179,7 +2179,7 @@ SYSCALL_DEFINE5(io_getevents_time32, __u32, ctx_id,
#ifdef CONFIG_COMPAT
struct __compat_aio_sigset {
compat_sigset_t __user *sigmask;
compat_uptr_t sigmask;
compat_size_t sigsetsize;
};
@ -2193,7 +2193,7 @@ COMPAT_SYSCALL_DEFINE6(io_pgetevents,
struct old_timespec32 __user *, timeout,
const struct __compat_aio_sigset __user *, usig)
{
struct __compat_aio_sigset ksig = { NULL, };
struct __compat_aio_sigset ksig = { 0, };
struct timespec64 t;
bool interrupted;
int ret;
@ -2204,7 +2204,7 @@ COMPAT_SYSCALL_DEFINE6(io_pgetevents,
if (usig && copy_from_user(&ksig, usig, sizeof(ksig)))
return -EFAULT;
ret = set_compat_user_sigmask(ksig.sigmask, ksig.sigsetsize);
ret = set_compat_user_sigmask(compat_ptr(ksig.sigmask), ksig.sigsetsize);
if (ret)
return ret;
@ -2228,7 +2228,7 @@ COMPAT_SYSCALL_DEFINE6(io_pgetevents_time64,
struct __kernel_timespec __user *, timeout,
const struct __compat_aio_sigset __user *, usig)
{
struct __compat_aio_sigset ksig = { NULL, };
struct __compat_aio_sigset ksig = { 0, };
struct timespec64 t;
bool interrupted;
int ret;
@ -2239,7 +2239,7 @@ COMPAT_SYSCALL_DEFINE6(io_pgetevents_time64,
if (usig && copy_from_user(&ksig, usig, sizeof(ksig)))
return -EFAULT;
ret = set_compat_user_sigmask(ksig.sigmask, ksig.sigsetsize);
ret = set_compat_user_sigmask(compat_ptr(ksig.sigmask), ksig.sigsetsize);
if (ret)
return ret;

5
fs/autofs/expire.c
View File

@ -459,9 +459,10 @@ static struct dentry *autofs_expire_indirect(struct super_block *sb,
*/
how &= ~AUTOFS_EXP_LEAVES;
found = should_expire(expired, mnt, timeout, how);
if (!found || found != expired)
/* Something has changed, continue */
if (found != expired) { // something has changed, continue
dput(found);
goto next;
}
if (expired != dentry)
dput(dentry);

84
fs/ecryptfs/inode.c
View File

@ -128,13 +128,20 @@ static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
struct inode *inode)
{
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
struct dentry *lower_dir_dentry;
struct inode *lower_dir_inode;
int rc;
dget(lower_dentry);
lower_dir_dentry = lock_parent(lower_dentry);
rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
lower_dir_inode = d_inode(lower_dir_dentry);
inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT);
dget(lower_dentry); // don't even try to make the lower negative
if (lower_dentry->d_parent != lower_dir_dentry)
rc = -EINVAL;
else if (d_unhashed(lower_dentry))
rc = -EINVAL;
else
rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
if (rc) {
printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
goto out_unlock;
@ -142,10 +149,11 @@ static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
fsstack_copy_attr_times(dir, lower_dir_inode);
set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
inode->i_ctime = dir->i_ctime;
d_drop(dentry);
out_unlock:
unlock_dir(lower_dir_dentry);
dput(lower_dentry);
inode_unlock(lower_dir_inode);
if (!rc)
d_drop(dentry);
return rc;
}
@ -311,9 +319,9 @@ static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry,
struct dentry *lower_dentry)
{
struct inode *inode, *lower_inode = d_inode(lower_dentry);
struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent);
struct inode *inode, *lower_inode;
struct ecryptfs_dentry_info *dentry_info;
struct vfsmount *lower_mnt;
int rc = 0;
dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
@ -322,16 +330,23 @@ static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry,
return ERR_PTR(-ENOMEM);
}
lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
fsstack_copy_attr_atime(d_inode(dentry->d_parent),
d_inode(lower_dentry->d_parent));
d_inode(path->dentry));
BUG_ON(!d_count(lower_dentry));
ecryptfs_set_dentry_private(dentry, dentry_info);
dentry_info->lower_path.mnt = lower_mnt;
dentry_info->lower_path.mnt = mntget(path->mnt);
dentry_info->lower_path.dentry = lower_dentry;
if (d_really_is_negative(lower_dentry)) {
/*
* negative dentry can go positive under us here - its parent is not
* locked. That's OK and that could happen just as we return from
* ecryptfs_lookup() anyway. Just need to be careful and fetch
* ->d_inode only once - it's not stable here.
*/
lower_inode = READ_ONCE(lower_dentry->d_inode);
if (!lower_inode) {
/* We want to add because we couldn't find in lower */
d_add(dentry, NULL);
return NULL;
@ -512,22 +527,30 @@ static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
{
struct dentry *lower_dentry;
struct dentry *lower_dir_dentry;
struct inode *lower_dir_inode;
int rc;
lower_dentry = ecryptfs_dentry_to_lower(dentry);
dget(dentry);
lower_dir_dentry = lock_parent(lower_dentry);
dget(lower_dentry);
rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry);
dput(lower_dentry);
if (!rc && d_really_is_positive(dentry))
lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
lower_dir_inode = d_inode(lower_dir_dentry);
inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT);
dget(lower_dentry); // don't even try to make the lower negative
if (lower_dentry->d_parent != lower_dir_dentry)
rc = -EINVAL;
else if (d_unhashed(lower_dentry))
rc = -EINVAL;
else
rc = vfs_rmdir(lower_dir_inode, lower_dentry);
if (!rc) {
clear_nlink(d_inode(dentry));
fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink);
unlock_dir(lower_dir_dentry);
fsstack_copy_attr_times(dir, lower_dir_inode);
set_nlink(dir, lower_dir_inode->i_nlink);
}
dput(lower_dentry);
inode_unlock(lower_dir_inode);
if (!rc)
d_drop(dentry);
dput(dentry);
return rc;
}
@ -565,20 +588,22 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct dentry *lower_new_dentry;
struct dentry *lower_old_dir_dentry;
struct dentry *lower_new_dir_dentry;
struct dentry *trap = NULL;
struct dentry *trap;
struct inode *target_inode;
if (flags)
return -EINVAL;
lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent);
lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent);
lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
dget(lower_old_dentry);
dget(lower_new_dentry);
lower_old_dir_dentry = dget_parent(lower_old_dentry);
lower_new_dir_dentry = dget_parent(lower_new_dentry);
target_inode = d_inode(new_dentry);
trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
dget(lower_new_dentry);
rc = -EINVAL;
if (lower_old_dentry->d_parent != lower_old_dir_dentry)
goto out_lock;
@ -606,11 +631,8 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (new_dir != old_dir)
fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry));
out_lock:
unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
dput(lower_new_dir_dentry);
dput(lower_old_dir_dentry);
dput(lower_new_dentry);
dput(lower_old_dentry);
unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
return rc;
}

31
fs/exportfs/expfs.c
View File

@ -519,26 +519,33 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid,
* inode is actually connected to the parent.
*/
err = exportfs_get_name(mnt, target_dir, nbuf, result);
if (!err) {
inode_lock(target_dir->d_inode);
nresult = lookup_one_len(nbuf, target_dir,
strlen(nbuf));
inode_unlock(target_dir->d_inode);
if (!IS_ERR(nresult)) {
if (nresult->d_inode) {
dput(result);
result = nresult;
} else
dput(nresult);
}
if (err) {
dput(target_dir);
goto err_result;
}
inode_lock(target_dir->d_inode);
nresult = lookup_one_len(nbuf, target_dir, strlen(nbuf));
if (!IS_ERR(nresult)) {
if (unlikely(nresult->d_inode != result->d_inode)) {
dput(nresult);
nresult = ERR_PTR(-ESTALE);
}
}
inode_unlock(target_dir->d_inode);
/*
* At this point we are done with the parent, but it's pinned
* by the child dentry anyway.
*/
dput(target_dir);
if (IS_ERR(nresult)) {
err = PTR_ERR(nresult);
goto err_result;
}
dput(result);
result = nresult;
/*
* And finally make sure the dentry is actually acceptable
* to NFSD.

15
fs/namespace.c
View File

@ -2478,8 +2478,10 @@ static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *
time64_to_tm(sb->s_time_max, 0, &tm);
pr_warn("Mounted %s file system at %s supports timestamps until %04ld (0x%llx)\n",
sb->s_type->name, mntpath,
pr_warn("%s filesystem being %s at %s supports timestamps until %04ld (0x%llx)\n",
sb->s_type->name,
is_mounted(mnt) ? "remounted" : "mounted",
mntpath,
tm.tm_year+1900, (unsigned long long)sb->s_time_max);
free_page((unsigned long)buf);
@ -2764,14 +2766,11 @@ static int do_new_mount_fc(struct fs_context *fc, struct path *mountpoint,
if (IS_ERR(mnt))
return PTR_ERR(mnt);
error = do_add_mount(real_mount(mnt), mountpoint, mnt_flags);
if (error < 0) {
mntput(mnt);
return error;
}
mnt_warn_timestamp_expiry(mountpoint, mnt);
error = do_add_mount(real_mount(mnt), mountpoint, mnt_flags);
if (error < 0)
mntput(mnt);
return error;
}

2
kernel/audit_watch.c
View File

@ -351,12 +351,12 @@ static int audit_get_nd(struct audit_watch *watch, struct path *parent)
struct dentry *d = kern_path_locked(watch->path, parent);
if (IS_ERR(d))
return PTR_ERR(d);
inode_unlock(d_backing_inode(parent->dentry));
if (d_is_positive(d)) {
/* update watch filter fields */
watch->dev = d->d_sb->s_dev;
watch->ino = d_backing_inode(d)->i_ino;
}
inode_unlock(d_backing_inode(parent->dentry));
dput(d);
return 0;
}

5
kernel/cgroup/cgroup.c
View File

@ -2119,11 +2119,12 @@ int cgroup_do_get_tree(struct fs_context *fc)
nsdentry = kernfs_node_dentry(cgrp->kn, sb);
dput(fc->root);
fc->root = nsdentry;
if (IS_ERR(nsdentry)) {
ret = PTR_ERR(nsdentry);
deactivate_locked_super(sb);
ret = PTR_ERR(nsdentry);
nsdentry = NULL;
}
fc->root = nsdentry;
}
if (!ctx->kfc.new_sb_created)