[PATCH v7 36/49] vfs: make chroot retry once on ESTALE error

Signed-off-by: Jeff Layton <jlayton(a)redhat.com&gt; --- fs/open.c | 37 +++++++++++++++++++++---------------- 1 file changed, 21 insertions(+), 16 deletions(-) diff --git a/fs/open.c b/fs/open.c index 81ba325..a015cb8 100644 --- a/fs/open.c +++ b/fs/open.c @@ -437,27 +437,32 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename) { struct path path; int error; + int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY; + unsigned int try = 0; - error = user_path_dir(filename, &path); - if (error) - goto out; + do { + error = user_path_at(AT_FDCWD, filename, lookup_flags, &path); + if (error) + break; - error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR); - if (error) - goto dput_and_out; + error = inode_permission(path.dentry->d_inode, + MAY_EXEC | MAY_CHDIR); + if (error) + goto dput_and_out; - error = -EPERM; - if (!capable(CAP_SYS_CHROOT)) - goto dput_and_out; - error = security_path_chroot(&path); - if (error) - goto dput_and_out; + error = -EPERM; + if (!capable(CAP_SYS_CHROOT)) + goto dput_and_out; + error = security_path_chroot(&path); + if (error) + goto dput_and_out; - set_fs_root(current->fs, &path); - error = 0; + set_fs_root(current->fs, &path); + error = 0; dput_and_out: - path_put(&path); -out: + path_put(&path); + lookup_flags |= LOOKUP_REVAL; + } while (retry_estale(error, try++)); return error; } -- 1.7.11.4