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From: "stephane+sourceware at chazelas dot org"
 <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug glob/31075] fnmatch("??") matches on 2-byte single characters
 (as well as 2 any-length characters)
Date: Sat, 18 Nov 2023 11:53:33 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31075

--- Comment #1 from Stephane Chazelas <stephane+sourceware at chazelas dot =
org> ---
(In reply to Stephane Chazelas from comment #0)
> Regression introduced in 2.34 by commit
> a79328c745219dcb395070cdcd3be065a8347f24  reproduced on Ubuntu 22.04, Deb=
ian
> sid libc6:amd64 2.37-12, and current git HEAD
> (dae3cf4134d476a4b4ef86fd7012231d6436c15e) built on that sid system.
>=20
> find . -name '??'
[...]

To clarify, "find" is used here to demonstrate the behaviour of the libc's
fnmatch(). Here with GNU find.

$ LD_DEBUG=3Dbindings find =C3=A9 -name '??' |& grep fnmatch
    323895:     binding file /lib/x86_64-linux-gnu/libselinux.so.1 [0] to
/lib/x86_64-linux-gnu/libc.so.6 [0]: normal symbol `fnmatch' [GLIBC_2.2.5]
    323895:     binding file find [0] to /lib/x86_64-linux-gnu/libc.so.6 [0=
]:
normal symbol `fnmatch' [GLIBC_2.2.5]

$ ltrace -e 'fnmatch' find =C3=A9 =C3=A9=C3=A9 $'\U10FFFF\U10FFFF' -name '?=
?'
find->fnmatch("foo", "foo", 0)=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20
                                      =3D 0
find->fnmatch("Foo", "foo", 0)=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20
                                      =3D 1
find->fnmatch("Foo", "foo", 16)=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20
                                      =3D 0
find->fnmatch("??", "\303\251", 0)=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20
                                      =3D 0
=C3=A9
find->fnmatch("??", "\303\251\303\251", 0)=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20
                                      =3D 0
=C3=A9=C3=A9
find->fnmatch("??", "\364\217\277\277\364\217\277\277", 0)=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                                      =3D 0
??
+++ exited (status 0) +++

(here showing ?? matching one 2-byte character, two 2-byte characters and t=
wo
4-byte characters).

--=20
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