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-rw-r--r--fs/open.c152
1 files changed, 124 insertions, 28 deletions
diff --git a/fs/open.c b/fs/open.c
index 9ff2f621b760..a81319b6177f 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -224,6 +224,21 @@ SYSCALL_DEFINE2(ftruncate64, unsigned int, fd, loff_t, length)
}
#endif /* BITS_PER_LONG == 32 */
+#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_TRUNCATE64)
+COMPAT_SYSCALL_DEFINE3(truncate64, const char __user *, pathname,
+ compat_arg_u64_dual(length))
+{
+ return ksys_truncate(pathname, compat_arg_u64_glue(length));
+}
+#endif
+
+#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_FTRUNCATE64)
+COMPAT_SYSCALL_DEFINE3(ftruncate64, unsigned int, fd,
+ compat_arg_u64_dual(length))
+{
+ return ksys_ftruncate(fd, compat_arg_u64_glue(length));
+}
+#endif
int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
{
@@ -339,6 +354,15 @@ SYSCALL_DEFINE4(fallocate, int, fd, int, mode, loff_t, offset, loff_t, len)
return ksys_fallocate(fd, mode, offset, len);
}
+#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_FALLOCATE)
+COMPAT_SYSCALL_DEFINE6(fallocate, int, fd, int, mode, compat_arg_u64_dual(offset),
+ compat_arg_u64_dual(len))
+{
+ return ksys_fallocate(fd, mode, compat_arg_u64_glue(offset),
+ compat_arg_u64_glue(len));
+}
+#endif
+
/*
* access() needs to use the real uid/gid, not the effective uid/gid.
* We do this by temporarily clearing all FS-related capabilities and
@@ -639,6 +663,42 @@ SYSCALL_DEFINE2(chmod, const char __user *, filename, umode_t, mode)
return do_fchmodat(AT_FDCWD, filename, mode);
}
+/**
+ * setattr_vfsuid - check and set ia_fsuid attribute
+ * @kuid: new inode owner
+ *
+ * Check whether @kuid is valid and if so generate and set vfsuid_t in
+ * ia_vfsuid.
+ *
+ * Return: true if @kuid is valid, false if not.
+ */
+static inline bool setattr_vfsuid(struct iattr *attr, kuid_t kuid)
+{
+ if (!uid_valid(kuid))
+ return false;
+ attr->ia_valid |= ATTR_UID;
+ attr->ia_vfsuid = VFSUIDT_INIT(kuid);
+ return true;
+}
+
+/**
+ * setattr_vfsgid - check and set ia_fsgid attribute
+ * @kgid: new inode owner
+ *
+ * Check whether @kgid is valid and if so generate and set vfsgid_t in
+ * ia_vfsgid.
+ *
+ * Return: true if @kgid is valid, false if not.
+ */
+static inline bool setattr_vfsgid(struct iattr *attr, kgid_t kgid)
+{
+ if (!gid_valid(kgid))
+ return false;
+ attr->ia_valid |= ATTR_GID;
+ attr->ia_vfsgid = VFSGIDT_INIT(kgid);
+ return true;
+}
+
int chown_common(const struct path *path, uid_t user, gid_t group)
{
struct user_namespace *mnt_userns, *fs_userns;
@@ -654,28 +714,24 @@ int chown_common(const struct path *path, uid_t user, gid_t group)
mnt_userns = mnt_user_ns(path->mnt);
fs_userns = i_user_ns(inode);
- uid = mapped_kuid_user(mnt_userns, fs_userns, uid);
- gid = mapped_kgid_user(mnt_userns, fs_userns, gid);
retry_deleg:
+ newattrs.ia_vfsuid = INVALID_VFSUID;
+ newattrs.ia_vfsgid = INVALID_VFSGID;
newattrs.ia_valid = ATTR_CTIME;
- if (user != (uid_t) -1) {
- if (!uid_valid(uid))
- return -EINVAL;
- newattrs.ia_valid |= ATTR_UID;
- newattrs.ia_uid = uid;
- }
- if (group != (gid_t) -1) {
- if (!gid_valid(gid))
- return -EINVAL;
- newattrs.ia_valid |= ATTR_GID;
- newattrs.ia_gid = gid;
- }
+ if ((user != (uid_t)-1) && !setattr_vfsuid(&newattrs, uid))
+ return -EINVAL;
+ if ((group != (gid_t)-1) && !setattr_vfsgid(&newattrs, gid))
+ return -EINVAL;
if (!S_ISDIR(inode->i_mode))
newattrs.ia_valid |=
ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
inode_lock(inode);
- error = security_path_chown(path, uid, gid);
+ /* Continue to send actual fs values, not the mount values. */
+ error = security_path_chown(
+ path,
+ from_vfsuid(mnt_userns, fs_userns, newattrs.ia_vfsuid),
+ from_vfsgid(mnt_userns, fs_userns, newattrs.ia_vfsgid));
if (!error)
error = notify_change(mnt_userns, path->dentry, &newattrs,
&delegated_inode);
@@ -786,7 +842,9 @@ static int do_dentry_open(struct file *f,
return 0;
}
- if (f->f_mode & FMODE_WRITE && !special_file(inode->i_mode)) {
+ if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
+ i_readcount_inc(inode);
+ } else if (f->f_mode & FMODE_WRITE && !special_file(inode->i_mode)) {
error = get_write_access(inode);
if (unlikely(error))
goto cleanup_file;
@@ -826,25 +884,24 @@ static int do_dentry_open(struct file *f,
goto cleanup_all;
}
f->f_mode |= FMODE_OPENED;
- if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
- i_readcount_inc(inode);
if ((f->f_mode & FMODE_READ) &&
likely(f->f_op->read || f->f_op->read_iter))
f->f_mode |= FMODE_CAN_READ;
if ((f->f_mode & FMODE_WRITE) &&
likely(f->f_op->write || f->f_op->write_iter))
f->f_mode |= FMODE_CAN_WRITE;
+ if ((f->f_mode & FMODE_LSEEK) && !f->f_op->llseek)
+ f->f_mode &= ~FMODE_LSEEK;
+ if (f->f_mapping->a_ops && f->f_mapping->a_ops->direct_IO)
+ f->f_mode |= FMODE_CAN_ODIRECT;
- f->f_write_hint = WRITE_LIFE_NOT_SET;
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
+ f->f_iocb_flags = iocb_flags(f);
file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
- /* NB: we're sure to have correct a_ops only after f_op->open */
- if (f->f_flags & O_DIRECT) {
- if (!f->f_mapping->a_ops || !f->f_mapping->a_ops->direct_IO)
- return -EINVAL;
- }
+ if ((f->f_flags & O_DIRECT) && !(f->f_mode & FMODE_CAN_ODIRECT))
+ return -EINVAL;
/*
* XXX: Huge page cache doesn't support writing yet. Drop all page
@@ -880,10 +937,7 @@ cleanup_all:
if (WARN_ON_ONCE(error > 0))
error = -EINVAL;
fops_put(f->f_op);
- if (f->f_mode & FMODE_WRITER) {
- put_write_access(inode);
- __mnt_drop_write(f->f_path.mnt);
- }
+ put_file_access(f);
cleanup_file:
path_put(&f->f_path);
f->f_path.mnt = NULL;
@@ -982,6 +1036,48 @@ struct file *dentry_open(const struct path *path, int flags,
}
EXPORT_SYMBOL(dentry_open);
+/**
+ * dentry_create - Create and open a file
+ * @path: path to create
+ * @flags: O_ flags
+ * @mode: mode bits for new file
+ * @cred: credentials to use
+ *
+ * Caller must hold the parent directory's lock, and have prepared
+ * a negative dentry, placed in @path->dentry, for the new file.
+ *
+ * Caller sets @path->mnt to the vfsmount of the filesystem where
+ * the new file is to be created. The parent directory and the
+ * negative dentry must reside on the same filesystem instance.
+ *
+ * On success, returns a "struct file *". Otherwise a ERR_PTR
+ * is returned.
+ */
+struct file *dentry_create(const struct path *path, int flags, umode_t mode,
+ const struct cred *cred)
+{
+ struct file *f;
+ int error;
+
+ validate_creds(cred);
+ f = alloc_empty_file(flags, cred);
+ if (IS_ERR(f))
+ return f;
+
+ error = vfs_create(mnt_user_ns(path->mnt),
+ d_inode(path->dentry->d_parent),
+ path->dentry, mode, true);
+ if (!error)
+ error = vfs_open(path, f);
+
+ if (unlikely(error)) {
+ fput(f);
+ return ERR_PTR(error);
+ }
+ return f;
+}
+EXPORT_SYMBOL(dentry_create);
+
struct file *open_with_fake_path(const struct path *path, int flags,
struct inode *inode, const struct cred *cred)
{