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Fix #80258: Windows Deduplication Enabled, randon permission errors #6354

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@cmb69 cmb69 commented Oct 19, 2020

A recent bug fix regarding symlinks claimed:

After resolving reparse points, the path still may be a reparse
point; in that case we have to resolve that reparse point as well.

While that is basically correct, some reparse points may point to
inaccessible system folders (e.g. IO_REPARSE_TAG_DEDUP points to
"\System Volume Information"). Since we don't know details about
arbitrary reparse points, and are mainly interested in nested symlinks,
we take a step back, and only resolve IO_REPARSE_TAG_SYMLINK for now.

A recent bug fix regarding symlinks claimed:

> After resolving reparse points, the path still may be a reparse
> point; in that case we have to resolve that reparse point as well.

While that is basically correct, some reparse points may point to
inaccessible system folders (e.g. `IO_REPARSE_TAG_DEDUP` points to
"\System Volume Information").  Since we don't know details about
arbitrary reparse points, and are mainly interested in nested symlinks,
we take a step back, and only resolve `IO_REPARSE_TAG_SYMLINK` for now.
@cmb69 cmb69 added the Bug label Oct 19, 2020
@php-pulls php-pulls closed this in 848e24f Oct 26, 2020
@cmb69 cmb69 deleted the cmb/80258 branch October 26, 2020 10:24
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