mariadb/mysql-test/t/symlink-aria-11902.test

#
# MDEV-11902 mi_open race condition
#
source include/have_maria.inc;
set default_storage_engine=Aria;
source symlink-myisam-11902.test;
MDEV-11902 mi_open race condition TOCTOU bug. The path is checked to be valid, symlinks are resolved. Then the resolved path is opened. Between the check and the open, there's a window when one can replace some path component with a symlink, bypassing validity checks. Fix: after we resolved all symlinks in the path, don't allow open() to resolve symlinks, there should be none. Compared to the old MyISAM/Aria code: * fastpath. Opening of not-symlinked files is just one open(), no fn_format() and lstat() anymore. * opening of symlinked tables doesn't do fn_format() and lstat() either. it also doesn't to realpath() (which was lstat-ing every path component), instead if opens every path component with O_PATH. * share->data_file_name stores realpath(path) not readlink(path). So, SHOW CREATE TABLE needs to do lstat/readlink() now (see ::info()), and certain error messages (cannot open file "XXX") show the real file path with all symlinks resolved. 2017-02-15 18:45:19 +01:00			`#`
			`# MDEV-11902 mi_open race condition`
			`#`
			`source include/have_maria.inc;`
			`set default_storage_engine=Aria;`
			`source symlink-myisam-11902.test;`