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From: Eduard Stefes <eduard.stefes@HIDDEN>
To:
Subject: gzip: add special eof handling for s390x
Date: Mon, 17 Feb 2025 11:44:09 +0100
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Cc: 75924 <at> debbugs.gnu.org, Andreas Hasenack <andreas.hasenack@HIDDEN>,
Eduard Stefes <eduard.stefes@HIDDEN>, Ilya Leoshkevich <iii@HIDDEN>
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due to hardware limitations we cannot rely on the OESC error code
before the hardware parsed the initial huffman tree. For this case
we have to add a branch to the EOF handling. we return an errorcode 2
(invalid data) if we where still in the initial phase (bytes_out == 0).
Otherwise we continue with the default EOF handling.
---
dfltcc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/dfltcc.c b/dfltcc.c
index 9f86581..e45b3ce 100644
--- a/dfltcc.c
+++ b/dfltcc.c
@@ -18,6 +18,7 @@
#include <config.h>
#include <stdlib.h>
+#include <errno.h>
#ifdef HAVE_SYS_SDT_H
# include <sys/sdt.h>
@@ -438,6 +439,8 @@ dfltcc_inflate ()
{
/* Premature EOF. */
flush_outbuf ();
+ if (bytes_out == 0)
+ return 2;
errno = 0;
read_error ();
}
--
2.48.1
bug-gzip@HIDDEN:bug#75924; Package gzip.
Full text available.Received: (at 75924) by debbugs.gnu.org; 17 Feb 2025 10:41:04 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Feb 17 05:41:04 2025 Received: from localhost ([127.0.0.1]:43491 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tjyYh-0001bj-Rv for submit <at> debbugs.gnu.org; Mon, 17 Feb 2025 05:41:04 -0500 Received: from mail.cs.ucla.edu ([131.179.128.66]:52686) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <eggert@HIDDEN>) id 1tjyYf-0001aa-6P for 75924 <at> debbugs.gnu.org; Mon, 17 Feb 2025 05:41:02 -0500 Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id ABC4F3C00D406; Mon, 17 Feb 2025 02:40:54 -0800 (PST) Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10032) with ESMTP id jRC92r7vvEVU; Mon, 17 Feb 2025 02:40:54 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 70C9D3C00D409; Mon, 17 Feb 2025 02:40:54 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.cs.ucla.edu 70C9D3C00D409 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=9D0B346E-2AEB-11ED-9476-E14B719DCE6C; t=1739788854; bh=9mZP1/aR535qOO6Vvm9gOMhabwXAdOIhg0ewtDD1sqQ=; h=Message-ID:Date:MIME-Version:To:From; b=jRGfE/leV//xuVFke6xoHRPAK0/F5RSKfxlpqBh6kIT5iy38Tr/d2cyn73o6cqo48 Y7p4igLBVQxsD7qr44kl5wOFFD354btMsh2uiYHSaTYjHeCYgegEL1fwWN2kKAtWdQ 6kEtmIJV9+SQ/o7k9K9D1EJoAZ6ypfI9iJZ5QwQK7ssLwl+nl0ebAGcMBkLstdYlMn 2NYO469jbDeKENKeNDaC9mnZVJb9NITKbj03czmCMU1WZ/fGSn76jRWg9+yxu7nuid d7WxSuOdaetKI/S4Qmw7WClbTGiFG/+byzg5gjI+P6Lr0CySQ2SquS+yQLaS4UNU/l C3aJ/gJDEtzKg== X-Virus-Scanned: amavis at mail.cs.ucla.edu Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10026) with ESMTP id iNehUmn1CeBS; Mon, 17 Feb 2025 02:40:54 -0800 (PST) Received: from [192.168.254.12] (unknown [47.147.225.25]) by mail.cs.ucla.edu (Postfix) with ESMTPSA id 533B13C00D406; Mon, 17 Feb 2025 02:40:54 -0800 (PST) Message-ID: <a1d503de-b309-4d48-af8b-a47986c55065@HIDDEN> Date: Mon, 17 Feb 2025 02:40:54 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: bug#75924: maint: fix s390 buffer flushes To: Eduard Stefes <Eduard.Stefes@HIDDEN> References: <5a8f263c4687100fceef43bf6a06a0b840af5180.camel@HIDDEN> <20250129141836.69050-1-eduard.stefes@HIDDEN> <45df1f77-1deb-46ae-9dbf-446bf192d9e9@HIDDEN> <e62470ce0f929063641b4a3f0a669a79cf930fc4.camel@HIDDEN> <9464ac85325d5c3f934dbaf537852f2c0e17f6da.camel@HIDDEN> <03871716-00d0-47d1-9dce-76d3e8800293@HIDDEN> <8f15011256c22f6cb9a5df70bdde5d2388332388.camel@HIDDEN> Content-Language: en-US From: Paul Eggert <eggert@HIDDEN> Organization: UCLA Computer Science Department In-Reply-To: <8f15011256c22f6cb9a5df70bdde5d2388332388.camel@HIDDEN> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 75924 Cc: "75924 <at> debbugs.gnu.org" <75924 <at> debbugs.gnu.org>, "iii@HIDDEN" <iii@HIDDEN>, "andreas.hasenack@HIDDEN" <andreas.hasenack@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) On 2025-02-17 02:38, Eduard Stefes wrote: > I came up with an ugly hack: Thanks, it sounds much nicer than the hack I was thinking of, which was to redo the entire run in software....
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From: Eduard Stefes <Eduard.Stefes@HIDDEN>
To: "eggert@HIDDEN" <eggert@HIDDEN>
Thread-Topic: [EXTERNAL] Re: bug#75924: maint: fix s390 buffer flushes
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Subject: RE: bug#75924: maint: fix s390 buffer flushes
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Cc: "75924 <at> debbugs.gnu.org" <75924 <at> debbugs.gnu.org>,
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Hi,
On Thu, 2025-02-06 at 10:20 -0800, Paul Eggert wrote:
> On 2025-02-05 07:46, Eduard Stefes wrote:
>=20
> > We think that the only
> > possibility for a problem here, is if faulty hardware updates
> > param->cf
> > incorrect.
>=20
> I'd rather not worry about hardware going bad, unless the hardware=20
> failure is a known real-world problem. So how about if we make the=20
> following further patch?
>=20
> =C2=A0=C2=A0 diff --git a/dfltcc.c b/dfltcc.c
> =C2=A0=C2=A0 index 9f86581..a360ce2 100644
> =C2=A0=C2=A0 --- a/dfltcc.c
> =C2=A0=C2=A0 +++ b/dfltcc.c
> =C2=A0=C2=A0 @@ -372,7 +372,7 @@ dfltcc_deflate (int pack_level)
> /* Read the input data.=C2=A0 */
> if (inptr =3D=3D insize)
> =C2=A0=C2=A0 {
> =C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (=
fill_inbuf (1) =3D=3D EOF && !param->cf)
> =C2=A0=C2=A0 +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (=
fill_inbuf (1) =3D=3D EOF)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 break;
> =C2=A0=C2=A0=C2=A0=C2=A0 inptr =3D 0;
> =C2=A0=C2=A0 }
>=20
>=20
We really need to check the cf(continuation flag) before we can return.
here a cite [1] from he spec:=20
> ... when one, indicates the operation is partially complete ...
if we do not wait for the hardware to lower the flag, we risk to
corrupt and overwrite parts of the output buffer.
>=20
> > I read rfc1952 and there is no explicit statement saying that
> > incomplete gz files *are corrupt or invalid*.
>=20
> My reading is that the RFC does not specify any behavior for
> incomplete=20
> gz files. However, gzip goes beyond what the RFC requires, and is=20
> supposed to complain "unexpected end of file" for incomplete files,=20
> versus "invalid compressed data--format violated" for files that are
> not=20
> prefixes of valid compressed files. We should maintain that behavior
> as=20
> it is valuable information to give to the user.
>=20
> I installed the patch to dfltcc.c that you suggested in=20
> <
> https://debbugs.gnu.org/c=20
> gi_bugreport.cgi-3Fbug-3D75924-
> 235&d=3DDwICaQ&c=3DBSDicqBQBDjDI9RkVyTcHQ&r=3D9u0E1SPaj7JeThb7S74vZ9s-
> VX1c_JTZ3i5rEh89cLU&m=3DmYHcCIO2Z8sEAayQMo8pBmY3pxQ16wbf8KMW2NPiDknJMFz
> 4qEFFyhpCJvbRLyu9&s=3DVxHLexQ8YkPuK0dODBtBIOdJSZNN3UOOaFzlPLnFd7s&e=3D=C2=
=A0>,
> superseding the=20
> incorrect patch I installed a couple of days ago. However, I'm
> worried=20
> about the patch to test/hufts that you also suggested, as it would
> mean=20
> gzip's diagnostics would differ on s390. As I understand it,
> test/hufts=20
> checks for invalid data not unexpected EOF, so for these tests gzip=20
> should say "invalid compressed data" rather than "unexpected end of=20
> file", which means that there's still a bug in the s390 port that=20
> relates to which diagnostic to give in this case.
>=20
> Am I understanding this correctly?
this is a tricky one. the hardware will not start emitting proper OESCs
(Operation-Ending-Supplemental Code) before a complete huffman tree was
built up. Until then we have to rely on the CC (Condition Code).
However DFLTCC_CC_OP2_TOO_SHORT and DFLTCC_CC_OP2_CORRUPT are
overloaded[1].=20
I came up with an ugly hack:=20
in case of an EOF we could check if bytes_out =3D=3D 0 and then return
2(invalid data). If we already wrote some bytes we continue with the
EOF error code. This new *if-branch* would only be hit in this special
case, where parsing of the initial huffman tree failed on the hardware.
It would *not* affect the situation when we have corrupt data *after*
the initial huffman tree was parsed by the hardware, because that is
covered here[2].
This makes hufts pass and does not affect any other test case. I will
do more exhaustive tests just to be sure that nothing else is affected.
[1] dfltcc.c:42
[2] dfltcc.c:457-464
--=20
Eduard Stefes <eduard.stefes@HIDDEN>
bug-gzip@HIDDEN:bug#75924; Package gzip.
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Subject: Re: bug#75924: maint: fix s390 buffer flushes
To: Eduard Stefes <Eduard.Stefes@HIDDEN>
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On 2025-02-05 07:46, Eduard Stefes wrote:
> We think that the only
> possibility for a problem here, is if faulty hardware updates param->cf
> incorrect.
I'd rather not worry about hardware going bad, unless the hardware
failure is a known real-world problem. So how about if we make the
following further patch?
diff --git a/dfltcc.c b/dfltcc.c
index 9f86581..a360ce2 100644
--- a/dfltcc.c
+++ b/dfltcc.c
@@ -372,7 +372,7 @@ dfltcc_deflate (int pack_level)
/* Read the input data. */
if (inptr == insize)
{
- if (fill_inbuf (1) == EOF && !param->cf)
+ if (fill_inbuf (1) == EOF)
break;
inptr = 0;
}
> I read rfc1952 and there is no explicit statement saying that
> incomplete gz files *are corrupt or invalid*.
My reading is that the RFC does not specify any behavior for incomplete
gz files. However, gzip goes beyond what the RFC requires, and is
supposed to complain "unexpected end of file" for incomplete files,
versus "invalid compressed data--format violated" for files that are not
prefixes of valid compressed files. We should maintain that behavior as
it is valuable information to give to the user.
I installed the patch to dfltcc.c that you suggested in
<https://debbugs.gnu.org/cgi/bugreport.cgi?bug=75924#5>, superseding the
incorrect patch I installed a couple of days ago. However, I'm worried
about the patch to test/hufts that you also suggested, as it would mean
gzip's diagnostics would differ on s390. As I understand it, test/hufts
checks for invalid data not unexpected EOF, so for these tests gzip
should say "invalid compressed data" rather than "unexpected end of
file", which means that there's still a bug in the s390 port that
relates to which diagnostic to give in this case.
Am I understanding this correctly?
bug-gzip@HIDDEN:bug#75924; Package gzip.
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bug-gzip@HIDDEN:bug#75924; Package gzip.
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<CANYNYEE1wQRfetjaHDV36wsP6SRjUua9EnihB53Cw4VaSX9eRA@HIDDEN> Subject: Re: bug#75924: maint: fix s390 buffer flushes To: Paul Eggert <eggert@HIDDEN> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 75924 X-Mailman-Approved-At: Wed, 29 Jan 2025 23:58:41 -0500 Cc: 75924 <at> debbugs.gnu.org, Eduard Stefes <eduard.stefes@HIDDEN>, Ilya Leoshkevich <iii@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) Hi, the s390x build of gzip 1.12 with this patch applied failed[1] due to a test failure: FAIL: hufts =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + initial_cwd_=3D/<<PKGBUILDDIR>>/builddir/tests + testdir_prefix_ + printf gt + pfx_=3Dgt + mktempd_ /<<PKGBUILDDIR>>/builddir/tests gt-hufts.XXXX + destdir_=3D/<<PKGBUILDDIR>>/builddir/tests + template_=3Dgt-hufts.XXXX + MAX_TRIES_=3D4 + destdir_slash_=3D/<<PKGBUILDDIR>>/builddir/tests/ + unset TMPDIR + d=3D/<<PKGBUILDDIR>>/builddir/tests/gt-hufts.whyU + : + test -d /<<PKGBUILDDIR>>/builddir/tests/gt-hufts.whyU + ls -dgo /<<PKGBUILDDIR>>/builddir/tests/gt-hufts.whyU + perms=3Ddrwx------ 2 4096 Jan 29 19:11 /<<PKGBUILDDIR>>/builddir/tests/gt-hufts.whyU + : + echo /<<PKGBUILDDIR>>/builddir/tests/gt-hufts.whyU + return + test_dir_=3D/<<PKGBUILDDIR>>/builddir/tests/gt-hufts.whyU + cd /<<PKGBUILDDIR>>/builddir/tests/gt-hufts.whyU + srcdir=3D../../../tests + builddir=3D.. + export srcdir builddir + gl_init_sh_nl_=3D + IFS=3D + expr 1 + 128 + eval trap 'Exit 129' 1 + trap Exit 129 1 + expr 2 + 128 + eval trap 'Exit 130' 2 + trap Exit 130 2 + expr 3 + 128 + eval trap 'Exit 131' 3 + trap Exit 131 3 + expr 13 + 128 + eval trap 'Exit 141' 13 + trap Exit 141 13 + expr 15 + 128 + eval trap 'Exit 143' 15 + trap Exit 143 15 + saved_IFS=3D + IFS=3D: + new_PATH=3D + sep_=3D + test -d /<<PKGBUILDDIR>>/builddir/. + new_PATH=3D/<<PKGBUILDDIR>>/builddir + sep_=3D: + test -d /usr/local/sbin/. + new_PATH=3D/<<PKGBUILDDIR>>/builddir:/usr/local/sbin + sep_=3D: + test -d /usr/local/bin/. + new_PATH=3D/<<PKGBUILDDIR>>/builddir:/usr/local/sbin:/usr/local/bin + sep_=3D: + test -d /usr/sbin/. + new_PATH=3D/<<PKGBUILDDIR>>/builddir:/usr/local/sbin:/usr/local/bin:/usr/= sbin + sep_=3D: + test -d /usr/bin/. + new_PATH=3D/<<PKGBUILDDIR>>/builddir:/usr/local/sbin:/usr/local/bin:/usr/= sbin:/usr/bin + sep_=3D: + test -d /sbin/. + new_PATH=3D/<<PKGBUILDDIR>>/builddir:/usr/local/sbin:/usr/local/bin:/usr/= sbin:/usr/bin:/sbin + sep_=3D: + test -d /bin/. + new_PATH=3D/<<PKGBUILDDIR>>/builddir:/usr/local/sbin:/usr/local/bin:/usr/= sbin:/usr/bin:/sbin:/bin + sep_=3D: + test -d /usr/games/. + new_PATH=3D/<<PKGBUILDDIR>>/builddir:/usr/local/sbin:/usr/local/bin:/usr/= sbin:/usr/bin:/sbin:/bin:/usr/games + sep_=3D: + IFS=3D + PATH=3D/<<PKGBUILDDIR>>/builddir:/usr/local/sbin:/usr/local/bin:/usr/sbin= :/usr/bin:/sbin:/bin:/usr/games + export PATH + trap remove_tmp_ 0 + path_prepend_ .. + test 1 !=3D 0 + path_dir_=3D.. + abs_path_dir_=3D/<<PKGBUILDDIR>>/builddir/tests/.. + PATH=3D/<<PKGBUILDDIR>>/builddir/tests/..:/<<PKGBUILDDIR>>/builddir:/usr/= local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games + create_exe_shims_ /<<PKGBUILDDIR>>/builddir/tests/.. + return 0 + shift + test 0 !=3D 0 + export PATH + printf \n...: invalid compressed data--format violated\n + fail=3D0 + returns_ 1 gzip -dc /<<PKGBUILDDIR>>/builddir/../tests/hufts-segv.gz + compare /dev/null out + compare_dev_null_ /dev/null out + test 2 =3D 2 + test x/dev/null =3D x/dev/null + test -s out + return 0 + return 0 + clean_stderr=3D s/.*hufts-segv.gz: /...: / /^+/d /Operation-Ending-Supplemental Code/d + sed s/.*hufts-segv.gz: /...: / /^+/d /Operation-Ending-Supplemental Code/d err-raw + compare exp err + compare_dev_null_ exp err + test 2 =3D 2 + test xexp =3D x/dev/null + test xerr =3D x/dev/null + return 2 + compare_ exp err + diff -u exp err + printf \037\213\010\000\060\060\060\060\060\060\144\000\000\000 + printf \ngzip: stdin: invalid compressed data--format violated\n + returns_ 1 gzip -d + sed s/.*hufts-segv.gz: /...: / /^+/d /Operation-Ending-Supplemental Code/d err33501-raw + compare exp33501 err33501 + compare_dev_null_ exp33501 err33501 + test 2 =3D 2 + test xexp33501 =3D x/dev/null + test xerr33501 =3D x/dev/null + return 2 + compare_ exp33501 err33501 + diff -u exp33501 err33501 --- exp33501 2025-01-29 19:11:54.875303836 +0000 +++ err33501 2025-01-29 19:11:54.875303836 +0000 @@ -1,2 +1,2 @@ -gzip: stdin: invalid compressed data--format violated +gzip: stdin: unexpected end of file + fail=3D1 + Exit 1 + set +e + exit 1 + exit 1 + remove_tmp_ + __st=3D1 + cleanup_ + : + test =3D yes + cd /<<PKGBUILDDIR>>/builddir/tests + chmod -R u+rwx /<<PKGBUILDDIR>>/builddir/tests/gt-hufts.whyU + rm -rf /<<PKGBUILDDIR>>/builddir/tests/gt-hufts.whyU + exit 1 FAIL hufts (exit status: 1) =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=3D=3D=3D=3D=3D=3D=3D=3D= =3D Testsuite summary for gzip 1.12 =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=3D=3D=3D=3D=3D=3D=3D=3D= =3D # TOTAL: 26 # PASS: 25 # SKIP: 0 # XFAIL: 0 # FAIL: 1 # XPASS: 0 # ERROR: 0 1. https://launchpadlibrarian.net/773464868/buildlog_ubuntu-plucky-s390x.gz= ip_1.12-1.1ubuntu3~ppa1_BUILDING.txt.gz On Wed, Jan 29, 2025 at 3:59=E2=80=AFPM Paul Eggert <eggert@HIDDEN> wr= ote: > > Thanks for the bug report. I installed the attached, a bit simpler than > the patch you suggested; can you please give it a try? > > Also, is there a related bug near dfltcc.c line 375? That is, when > (inptr =3D=3D insize && fill_inbuf (1) =3D=3D EOF && param->cf), won't in= size > then be zero, so that gzip will go into an infinite loop attempting to > read past EOF?
bug-gzip@HIDDEN:bug#75924; Package gzip.
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bug-gzip@HIDDEN:bug#75924; Package gzip.
Full text available.Paul Eggert <eggert@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at 75924) by debbugs.gnu.org; 29 Jan 2025 18:59:11 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Jan 29 13:59:11 2025 Received: from localhost ([127.0.0.1]:43041 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tdDHK-00054R-Vz for submit <at> debbugs.gnu.org; Wed, 29 Jan 2025 13:59:11 -0500 Received: from mail.cs.ucla.edu ([131.179.128.66]:44638) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <eggert@HIDDEN>) id 1tdDHI-00053u-7a for 75924 <at> debbugs.gnu.org; Wed, 29 Jan 2025 13:59:09 -0500 Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 6990A3C01409D; Wed, 29 Jan 2025 10:59:01 -0800 (PST) Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10032) with ESMTP id 5fYUfPa14gy5; Wed, 29 Jan 2025 10:59:00 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id C7DCE3C00E40A; Wed, 29 Jan 2025 10:59:00 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.cs.ucla.edu C7DCE3C00E40A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=9D0B346E-2AEB-11ED-9476-E14B719DCE6C; t=1738177140; bh=30Dl/QGs+9KAOCzXlbldg6eJWBmdcIeDeFyansz3W68=; h=Message-ID:Date:MIME-Version:To:From; b=Kse4k9sgeTD6Hp1htFjIUwSjeAh2nKTRqvYkk+oximREIy8mJwtc5lqtyIE9GmoeO d5qJA7QgjHhCqEHBTvKHOnXBf7vM4hgFN94aRWYrP+1wmZKz1nRZ4NCJj04xpcuH3x w3+MtfK7WcN6qbbBbn3kBdAAg2YUiqTgdZ8ge/edt1MXPo2ae+a5oFl7OHaiTcXdGd XnXVLYTsb8Sm2Z0MdyIoMrQZYTUfxxgYQirVIwGk/I+oNL8NvI/fvg+M6py7CxRn/A esNRvasAWDrhN3KW01AOh18hWE9JQ+uoMKMSVwd/PXHqTQw/Jznqbb5xHVD7TT2b4S z3qIgWH3oRIew== X-Virus-Scanned: amavis at mail.cs.ucla.edu Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10026) with ESMTP id NAa-8441Z6Cw; Wed, 29 Jan 2025 10:59:00 -0800 (PST) Received: from [192.168.254.12] (unknown [47.154.28.214]) by mail.cs.ucla.edu (Postfix) with ESMTPSA id A7FFB3C01409D; Wed, 29 Jan 2025 10:59:00 -0800 (PST) Content-Type: multipart/mixed; boundary="------------5LqlOc0V6pAowN6PHGzA9t0E" Message-ID: <45df1f77-1deb-46ae-9dbf-446bf192d9e9@HIDDEN> Date: Wed, 29 Jan 2025 10:58:59 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: bug#75924: maint: fix s390 buffer flushes To: Eduard Stefes <eduard.stefes@HIDDEN> References: <5a8f263c4687100fceef43bf6a06a0b840af5180.camel@HIDDEN> <20250129141836.69050-1-eduard.stefes@HIDDEN> Content-Language: en-US From: Paul Eggert <eggert@HIDDEN> Organization: UCLA Computer Science Department In-Reply-To: <20250129141836.69050-1-eduard.stefes@HIDDEN> X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 75924 Cc: 75924 <at> debbugs.gnu.org, Ilya Leoshkevich <iii@HIDDEN>, Andreas Hasenack <andreas.hasenack@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) This is a multi-part message in MIME format. --------------5LqlOc0V6pAowN6PHGzA9t0E Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Thanks for the bug report. I installed the attached, a bit simpler than the patch you suggested; can you please give it a try? Also, is there a related bug near dfltcc.c line 375? That is, when (inptr == insize && fill_inbuf (1) == EOF && param->cf), won't insize then be zero, so that gzip will go into an infinite loop attempting to read past EOF? --------------5LqlOc0V6pAowN6PHGzA9t0E Content-Type: text/x-patch; charset=UTF-8; name="0001-gzip-fix-problem-with-s390-buffer-flushes.patch" Content-Disposition: attachment; filename="0001-gzip-fix-problem-with-s390-buffer-flushes.patch" Content-Transfer-Encoding: base64 RnJvbSA1MTA4ODk3MGQ0NWJhZWRiYTQ3Mzk2MzIzMDVkMWRiYzVhY2JiM2JmIE1vbiBTZXAg MTcgMDA6MDA6MDAgMjAwMQpGcm9tOiBQYXVsIEVnZ2VydCA8ZWdnZXJ0QGNzLnVjbGEuZWR1 PgpEYXRlOiBXZWQsIDI5IEphbiAyMDI1IDEwOjUyOjQ5IC0wODAwClN1YmplY3Q6IFtQQVRD SF0gZ3ppcDogZml4IHByb2JsZW0gd2l0aCBzMzkwIGJ1ZmZlciBmbHVzaGVzCgpQcm9ibGVt IHJlcG9ydGVkIGJ5IEVkdWFyZCBTdGVmZXMgPGh0dHBzOi8vYnVncy5nbnUub3JnLzc0NjUx Pi4KKiBkZmx0Y2MuYyAoZGZsdGNjX2RlZmxhdGUpOiBGbHVzaCBvdXRwdXQgYnVmZmVyIGlm IHByZW1hdHVyZSBFT0YuCi0tLQogTkVXUyAgICAgfCA0ICsrKysKIGRmbHRjYy5jIHwgNiAr LS0tLS0KIDIgZmlsZXMgY2hhbmdlZCwgNSBpbnNlcnRpb25zKCspLCA1IGRlbGV0aW9ucygt KQoKZGlmZiAtLWdpdCBhL05FV1MgYi9ORVdTCmluZGV4IDhiODczMWIuLjQxNzY4OWMgMTAw NjQ0Ci0tLSBhL05FV1MKKysrIGIvTkVXUwpAQCAtNCw2ICs0LDEwIEBAIEdOVSBnemlwIE5F V1MgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAtKi0gb3V0bGluZSAtKi0K IAogKiogQnVnIGZpeGVzCiAKKyAgJ2d6aXAgLWQnIG5vIGxvbmdlciBvbWl0cyB0aGUgbGFz dCBwYXJ0aWFsIG91dHB1dCBidWZmZXIgd2hlbiB0aGUKKyAgaW5wdXQgZW5kcyB1bmV4cGVj dGVkbHkgb24gYW4gSUJNIFogcGxhdGZvcm0uCisgIFtidWcgaW50cm9kdWNlZCBpbiBnemlw LTEuMTFdCisKICAgJ2d6aXAgLWwnIG5vIGxvbmdlciBtaXNyZXBvcnRzIGxlbmd0aHMgb2Yg bXVsdGltZW1iZXIgaW5wdXRzLgogICBbYnVnIGludHJvZHVjZWQgaW4gZ3ppcC0xLjEyXQog CmRpZmYgLS1naXQgYS9kZmx0Y2MuYyBiL2RmbHRjYy5jCmluZGV4IGZjZGMwNWEuLmM5N2Ux OWUgMTAwNjQ0Ci0tLSBhL2RmbHRjYy5jCisrKyBiL2RmbHRjYy5jCkBAIC00MzQsMTEgKzQz NCw3IEBAIGRmbHRjY19pbmZsYXRlICgpCiAgICAgICAgIGZsdXNoX291dGJ1ZiAoKTsKICAg ICAgIGlmIChpbnB0ciA9PSBpbnNpemUpCiAgICAgICAgIHsKLSAgICAgICAgICBpZiAoZmls bF9pbmJ1ZiAoMSkgPT0gRU9GKQotICAgICAgICAgICAgewotICAgICAgICAgICAgICAvKiBQ cmVtYXR1cmUgRU9GLiAgKi8KLSAgICAgICAgICAgICAgcmV0dXJuIDI7Ci0gICAgICAgICAg ICB9CisgICAgICAgICAgZmlsbF9pbmJ1ZiAoMCk7CiAgICAgICAgICAgaW5wdHIgPSAwOwog ICAgICAgICB9CiAKLS0gCjIuNDUuMgoK --------------5LqlOc0V6pAowN6PHGzA9t0E--
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From: Eduard Stefes <eduard.stefes@HIDDEN>
To: bug-gzip <bug-gzip@HIDDEN>
Subject: maint: fix s390 buffer flushes
Date: Wed, 29 Jan 2025 15:18:36 +0100
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Cc: Andreas Hasenack <andreas.hasenack@HIDDEN>,
Eduard Stefes <eduard.stefes@HIDDEN>, Ilya Leoshkevich <iii@HIDDEN>
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Problem reported by Nick Rosbrook in:
https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/2083700
align the behavior of dfltcc_inflate to do the same as gzip_inflate
when it hits a premature EOF
---
dfltcc.c | 6 +++++-
tests/hufts | 6 ++++--
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/dfltcc.c b/dfltcc.c
index 811c1f8..5d421bb 100644
--- a/dfltcc.c
+++ b/dfltcc.c
@@ -18,6 +18,7 @@
#include <config.h>
#include <stdlib.h>
+#include <errno.h>
#ifdef HAVE_SYS_SDT_H
# include <sys/sdt.h>
@@ -437,7 +438,10 @@ dfltcc_inflate ()
if (fill_inbuf (1) == EOF)
{
/* Premature EOF. */
- return 2;
+ flush_outbuf ();
+ errno = 0;
+ read_error ();
+ __builtin_unreachable ();
}
inptr = 0;
}
diff --git a/tests/hufts b/tests/hufts
index c464ef6..6dbb8ac 100755
--- a/tests/hufts
+++ b/tests/hufts
@@ -40,10 +40,12 @@ compare exp err || fail=1
printf '\037\213\010\000\060\060\060\060\060\060\144\000\000\000' > bug33501 \
|| framework_failure_
-printf '\ngzip: stdin: invalid compressed data--format violated\n' >exp33501 \
+printf '\ngzip: stdin: invalid compressed data--format violated\n' > exp33501.1 \
+ || framework_failure_
+printf '\ngzip: stdin: unexpected end of file\n' > exp33501.2 \
|| framework_failure_
returns_ 1 gzip -d <bug33501 >out33501 2> err33501-raw || fail=1
sed "$clean_stderr" err33501-raw > err33501 || framework_failure_
-compare exp33501 err33501 || fail=1
+compare exp33501.1 err33501 || compare exp33501.2 err33501 || fail=1
Exit $fail
--
2.48.1
Eduard Stefes <eduard.stefes@HIDDEN>:bug-gzip@HIDDEN.
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