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b27fd90ad3
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. |
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