From: Ramsay Jones <ramsay@ramsayjones.plus.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>, git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>,
"Carlo Marcelo Arenas Belón" <carenas@gmail.com>,
"Johannes Schindelin" <Johannes.Schindelin@gmx.de>,
"Todd Zullinger" <tmz@pobox.com>, "Johannes Sixt" <j6t@kdbg.org>
Subject: Re: [PATCH v4 2/2] grep/pcre2: better support invalid UTF-8 haystacks
Date: Sun, 24 Jan 2021 13:53:40 +0000 [thread overview]
Message-ID: <6fe69ede-d24b-1742-f699-c9af05560c0c@ramsayjones.plus.com> (raw)
In-Reply-To: <20210124114855.13036-3-avarab@gmail.com>
On 24/01/2021 11:48, Ævar Arnfjörð Bjarmason wrote:
> Improve the support for invalid UTF-8 haystacks given a non-ASCII
> needle when using the PCREv2 backend.
>
> This is a more complete fix for a bug I started to fix in
> 870eea8166 (grep: do not enter PCRE2_UTF mode on fixed matching,
> 2019-07-26), now that PCREv2 has the PCRE2_MATCH_INVALID_UTF mode we
> can make use of it.
>
> This fixes the sort of case described in 8a5999838e (grep: stess test
> PCRE v2 on invalid UTF-8 data, 2019-07-26), i.e.:
>
> - The subject string is non-ASCII (e.g. "ævar")
> - We're under a is_utf8_locale(), e.g. "en_US.UTF-8", not "C"
> - We are using --ignore-case, or we're a non-fixed pattern
>
> If those conditions were satisfied and we matched found non-valid
> UTF-8 data PCREv2 might bark on it, in practice this only happened
> under the JIT backend (turned on by default on most platforms).
>
> Ultimately this fixes a "regression" in b65abcafc7 ("grep: use PCRE v2
> for optimized fixed-string search", 2019-07-01), I'm putting that in
> scare-quotes because before then we wouldn't properly support these
> complex case-folding, locale etc. cases either, it just broke in
> different ways.
>
> There was a bug related to this the PCRE2_NO_START_OPTIMIZE flag fixed
> in PCREv2 10.36. It can be worked around by setting the
> PCRE2_NO_START_OPTIMIZE flag. Let's do that in those cases, and add
> tests for the bug.
>
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
> ---
> Makefile | 1 +
> grep.c | 8 +++++-
> grep.h | 4 +++
> t/helper/test-pcre2-config.c | 12 +++++++++
> t/helper/test-tool.c | 1 +
> t/helper/test-tool.h | 1 +
> t/t7812-grep-icase-non-ascii.sh | 46 ++++++++++++++++++++++++++++++++-
> 7 files changed, 71 insertions(+), 2 deletions(-)
> create mode 100644 t/helper/test-pcre2-config.c
>
> diff --git a/Makefile b/Makefile
> index 4edfda3e00..42a7ed96e2 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -722,6 +722,7 @@ TEST_BUILTINS_OBJS += test-online-cpus.o
> TEST_BUILTINS_OBJS += test-parse-options.o
> TEST_BUILTINS_OBJS += test-parse-pathspec-file.o
> TEST_BUILTINS_OBJS += test-path-utils.o
> +TEST_BUILTINS_OBJS += test-pcre2-config.o
> TEST_BUILTINS_OBJS += test-pkt-line.o
> TEST_BUILTINS_OBJS += test-prio-queue.o
> TEST_BUILTINS_OBJS += test-proc-receive.o
> diff --git a/grep.c b/grep.c
> index efeb6dc58d..e329f19877 100644
> --- a/grep.c
> +++ b/grep.c
> @@ -492,7 +492,13 @@ static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt
> }
> if (!opt->ignore_locale && is_utf8_locale() && has_non_ascii(p->pattern) &&
> !(!opt->ignore_case && (p->fixed || p->is_fixed)))
> - options |= PCRE2_UTF;
> + options |= (PCRE2_UTF | PCRE2_MATCH_INVALID_UTF);
> +
> + if (PCRE2_MATCH_INVALID_UTF &&
> + options & (PCRE2_UTF | PCRE2_CASELESS) &&
> + !(PCRE2_MAJOR >= 10 && PCRE2_MAJOR >= 36))
^^^^^^^^^^^^^^^^^^
I assume that this should be s/_MAJOR/_MINOR/. ;-)
> + /* Work around https://bugs.exim.org/show_bug.cgi?id=2642 fixed in 10.36 */
> + options |= PCRE2_NO_START_OPTIMIZE;
>
> p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
> p->patternlen, options, &error, &erroffset,
ATB,
Ramsay Jones
next prev parent reply other threads:[~2021-01-24 14:03 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-21 19:40 [PATCH] grep: use custom JIT stack with pcre2 Carlo Marcelo Arenas Belón
2019-07-24 15:14 ` [PATCH 0/3] grep: PCRE JIT fixes Ævar Arnfjörð Bjarmason
2019-07-24 16:18 ` Junio C Hamano
2019-07-24 20:03 ` Ævar Arnfjörð Bjarmason
2019-07-26 15:08 ` [PATCH v2 0/8] grep: PCRE JIT fixes + ab/no-kwset fix Ævar Arnfjörð Bjarmason
2019-07-26 20:27 ` Junio C Hamano
2019-07-29 9:20 ` Ævar Arnfjörð Bjarmason
2019-07-29 16:12 ` Junio C Hamano
2019-07-26 15:08 ` [PATCH v2 1/8] grep: remove overly paranoid BUG(...) code Ævar Arnfjörð Bjarmason
2019-07-26 15:08 ` [PATCH v2 2/8] grep: stop "using" a custom JIT stack with PCRE v2 Ævar Arnfjörð Bjarmason
2019-07-29 0:33 ` Carlo Arenas
2019-07-26 15:08 ` [PATCH v2 3/8] grep: stop using a custom JIT stack with PCRE v1 Ævar Arnfjörð Bjarmason
2019-07-29 1:26 ` Carlo Arenas
2019-07-26 15:08 ` [PATCH v2 4/8] grep: consistently use "p->fixed" in compile_regexp() Ævar Arnfjörð Bjarmason
2019-07-29 1:48 ` Carlo Arenas
2019-07-29 9:05 ` Ævar Arnfjörð Bjarmason
2019-07-29 9:13 ` Ævar Arnfjörð Bjarmason
2019-07-29 16:23 ` Junio C Hamano
2019-07-26 15:08 ` [PATCH v2 5/8] grep: create a "is_fixed" member in "grep_pat" Ævar Arnfjörð Bjarmason
2019-07-26 15:08 ` [PATCH v2 6/8] grep: stess test PCRE v2 on invalid UTF-8 data Ævar Arnfjörð Bjarmason
2019-07-26 20:34 ` Junio C Hamano
2019-07-26 21:55 ` Ævar Arnfjörð Bjarmason
2019-07-29 3:06 ` Carlo Arenas
2019-11-26 21:50 ` [PATCH] t7812: add missing redirects Andreas Schwab
2019-11-26 22:27 ` Johannes Schindelin
2019-11-26 23:11 ` Andreas Schwab
2019-11-27 11:58 ` Jeff King
2019-11-30 0:46 ` [PATCH] t7812: expect failure for grep -i with invalid UTF-8 data Todd Zullinger
2019-11-30 8:00 ` Andreas Schwab
2019-12-01 16:33 ` Junio C Hamano
2019-12-01 17:09 ` Andreas Schwab
2019-12-01 18:32 ` Todd Zullinger
2019-12-02 6:13 ` Junio C Hamano
2019-07-26 15:08 ` [PATCH v2 7/8] grep: do not enter PCRE2_UTF mode on fixed matching Ævar Arnfjörð Bjarmason
2019-07-26 20:36 ` Junio C Hamano
2019-07-26 15:08 ` [PATCH v2 8/8] grep: optimistically use PCRE2_MATCH_INVALID_UTF Ævar Arnfjörð Bjarmason
2019-07-26 21:07 ` Junio C Hamano
2019-07-26 21:53 ` Ævar Arnfjörð Bjarmason
2019-07-26 21:57 ` Ævar Arnfjörð Bjarmason
2021-01-24 2:12 ` [PATCH v3 0/4] grep: better support invalid UTF-8 haystacks Ævar Arnfjörð Bjarmason
2021-01-24 11:48 ` [PATCH v4 0/2] " Ævar Arnfjörð Bjarmason
2021-01-24 17:28 ` [PATCH v5 " Ævar Arnfjörð Bjarmason
2021-01-24 17:28 ` [PATCH v5 1/2] grep/pcre2 tests: don't rely on invalid UTF-8 data test Ævar Arnfjörð Bjarmason
2021-01-24 17:28 ` [PATCH v5 2/2] grep/pcre2: better support invalid UTF-8 haystacks Ævar Arnfjörð Bjarmason
2021-01-24 11:48 ` [PATCH v4 1/2] grep/pcre2 tests: don't rely on invalid UTF-8 data test Ævar Arnfjörð Bjarmason
2021-01-24 11:48 ` [PATCH v4 2/2] grep/pcre2: better support invalid UTF-8 haystacks Ævar Arnfjörð Bjarmason
2021-01-24 13:53 ` Ramsay Jones [this message]
2021-01-24 14:24 ` Ramsay Jones
2021-01-24 14:49 ` Ævar Arnfjörð Bjarmason
2021-01-24 16:10 ` Ramsay Jones
2021-01-24 17:29 ` Ævar Arnfjörð Bjarmason
2021-01-24 2:12 ` [PATCH v3 1/4] grep/pcre2 tests: don't rely on invalid UTF-8 data test Ævar Arnfjörð Bjarmason
2021-01-24 2:12 ` [PATCH v3 2/4] grep/pcre2: simplify boolean spaghetti Ævar Arnfjörð Bjarmason
2021-01-24 5:33 ` Junio C Hamano
2021-01-24 10:45 ` Johannes Sixt
2021-01-24 2:12 ` [PATCH v3 3/4] grep/pcre2: further " Ævar Arnfjörð Bjarmason
2021-01-24 2:12 ` [PATCH v3 4/4] grep/pcre2: better support invalid UTF-8 haystacks Ævar Arnfjörð Bjarmason
2019-07-24 15:14 ` [PATCH 1/3] grep: remove overly paranoid BUG(...) code Ævar Arnfjörð Bjarmason
2019-07-24 15:14 ` [PATCH 2/3] grep: stop "using" a custom JIT stack with PCRE v2 Ævar Arnfjörð Bjarmason
2019-07-24 16:24 ` Junio C Hamano
2019-07-24 20:06 ` Ævar Arnfjörð Bjarmason
2019-07-25 5:11 ` Carlo Arenas
2019-07-24 15:14 ` [PATCH 3/3] grep: stop using a custom JIT stack with PCRE v1 Ævar Arnfjörð Bjarmason
2019-07-26 13:15 ` Carlo Arenas
2019-07-26 13:50 ` Ævar Arnfjörð Bjarmason
2019-07-26 14:12 ` Carlo Arenas
2019-07-26 14:43 ` Ævar Arnfjörð Bjarmason
2019-07-26 20:26 ` [RFC PATCH 0/2] PCRE1 cleanup Carlo Marcelo Arenas Belón
2019-07-26 20:26 ` [RFC PATCH 1/2] grep: make sure NO_LIBPCRE1_JIT disable JIT in PCRE1 Carlo Marcelo Arenas Belón
2019-07-26 20:26 ` [RFC PATCH 2/2] grep: refactor and simplify PCRE1 support Carlo Marcelo Arenas Belón
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