linux-kernel - Unicode conversion issue

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Message-ID: <Z1mzu4Eg6CPURra3@google.com>
Date: Wed, 11 Dec 2024 15:46:03 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	krisman@...e.de
Subject: Unicode conversion issue

Hi Linus/Gabriel,

Once Android applied the below patch [1], some special characters started to be
converted differently resulting in different length, so that f2fs cannot find
the filename correctly which was created when the kernel didn't have [1].

There is one bug report in [2] where describes more details. In order to avoid
this, could you please consider reverting [1] asap? Or, is there any other
way to keep the conversion while addressing CVE? It's very hard for f2fs to
distinguish two valid converted lengths before/after [1].

[1] 5c26d2f1d3f5 ("unicode: Don't special case ignorable code points")
[2] https://bugzilla.kernel.org/show_bug.cgi?id=219586