Date: Mon, 1 Aug 2016 18:22:16 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: FreeBSD Current <freebsd-current@freebsd.org>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: BSD grep dumps core Message-ID: <54B0B5B7-25CF-4B7D-9874-73D33481CC1C@FreeBSD.org> In-Reply-To: <20160731153738.GA33643@troutmask.apl.washington.edu> References: <20160731153738.GA33643@troutmask.apl.washington.edu>
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--Apple-Mail=_56E280E6-6C8C-4D30-B32E-3A3B0932FE1F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 31 Jul 2016, at 17:37, Steve Kargl <sgk@troutmask.apl.washington.edu> = wrote: >=20 > Script started on Sun Jul 31 08:30:56 2016 > troutmask:sgk[200] cd gcc/gcc7 > troutmask:sgk[201] svn status > ? 7.diff > ? decl.c.diff > ? gcc/fortran/old > ? gcc/fortran/pr38351.diff > ? gcc/fortran/pr41922.diff > ? gcc/fortran/pr69860.diff > ? trans-decl.c.diff > ? typescript > ? z1.diff > troutmask:sgk[202] svn status | grep -v -E ^\? > Segmentation fault (core dumped) > troutmask:sgk[203] svn status | grep -v -E ^"\?" > troutmask:sgk[204] exit > exit >=20 > Script done on Sun Jul 31 08:31:54 2016 >=20 > The core dump happens with both tcsh and sh. >=20 > The following works as expected >=20 > troutmask:sgk[202] svn status | gnugrep -v -E ^\? Yes, '^?' is an invalid extended regular expression, but GNU grep does not complain about it, and simply discards the '?' character. Our BSD grep dies because it also attempts to discard, but then some later logic goes beyond the end of the buffer. Please try this fix: Index: usr.bin/grep/regex/tre-fastmatch.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- usr.bin/grep/regex/tre-fastmatch.c (revision 303551) +++ usr.bin/grep/regex/tre-fastmatch.c (working copy) @@ -621,7 +621,7 @@ tre_compile_fast(fastmatch_t *fg, const tre_char_t case TRE_CHAR('+'): case TRE_CHAR('?'): if ((cflags & REG_EXTENDED) && (i =3D=3D 0)) - continue; + goto badpat; else if ((cflags & REG_EXTENDED) ^ !escaped) STORE_CHAR; else After this, bsdgrep errors out with: % bsdgrep -E '^?' bsdgrep: Invalid preceding regular expression which is much saner IMHO. -Dimitry --Apple-Mail=_56E280E6-6C8C-4D30-B32E-3A3B0932FE1F Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.30 iEYEARECAAYFAlefdzwACgkQsF6jCi4glqN/fACguF9Gh9i4kCUA936CLMlMHnCZ +4oAn1iuihtI/htbER4YTHFqym/hQbJ3 =zfdm -----END PGP SIGNATURE----- --Apple-Mail=_56E280E6-6C8C-4D30-B32E-3A3B0932FE1F--
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