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[147.11.105.124]) by smtp.gmail.com with ESMTPSA id lt5sm1589764pjb.43.2021.12.01.23.38.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Dec 2021 23:38:49 -0800 (PST) From: pgowda To: openembedded-core@lists.openembedded.org Cc: anuj.mittal@intel.com, richard.purdie@linuxfoundation.org, rwmacleod@gmail.com, umesh.kalappa0@gmail.com, pgowda Subject: [hardknott][PATCH] glibc: Backport fix for CVE-2021-43396 Date: Wed, 1 Dec 2021 23:38:45 -0800 Message-Id: <20211202073845.150820-1-pgowda.cve@gmail.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 List-Id: X-Webhook-Received: from li982-79.members.linode.com [45.33.32.79] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Thu, 02 Dec 2021 07:38:51 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/159074 Backport the fix for CVE-2021-43396. It is disputed that this is a security issue. (From OE-Core rev: e8de9b01c6b305b2498c5f942397a49ae2af0cde) Signed-off-by: pgowda --- .../glibc/glibc/0031-CVE-2021-43396.patch | 188 ++++++++++++++++++ meta/recipes-core/glibc/glibc_2.33.bb | 1 + 2 files changed, 189 insertions(+) create mode 100644 meta/recipes-core/glibc/glibc/0031-CVE-2021-43396.patch diff --git a/meta/recipes-core/glibc/glibc/0031-CVE-2021-43396.patch b/meta/recipes-core/glibc/glibc/0031-CVE-2021-43396.patch new file mode 100644 index 0000000000..179b0c559d --- /dev/null +++ b/meta/recipes-core/glibc/glibc/0031-CVE-2021-43396.patch @@ -0,0 +1,188 @@ +From ff012870b2c02a62598c04daa1e54632e020fd7d Mon Sep 17 00:00:00 2001 +From: Nikita Popov +Date: Tue, 2 Nov 2021 13:21:42 +0500 +Subject: [PATCH] gconv: Do not emit spurious NUL character in ISO-2022-JP-3 + (bug 28524) + +Bugfix 27256 has introduced another issue: +In conversion from ISO-2022-JP-3 encoding, it is possible +to force iconv to emit extra NUL character on internal state reset. +To do this, it is sufficient to feed iconv with escape sequence +which switches active character set. +The simplified check 'data->__statep->__count != ASCII_set' +introduced by the aforementioned bugfix picks that case and +behaves as if '\0' character has been queued thus emitting it. + +To eliminate this issue, these steps are taken: +* Restore original condition +'(data->__statep->__count & ~7) != ASCII_set'. +It is necessary since bits 0-2 may contain +number of buffered input characters. +* Check that queued character is not NUL. +Similar step is taken for main conversion loop. + +Bundled test case follows following logic: +* Try to convert ISO-2022-JP-3 escape sequence +switching active character set +* Reset internal state by providing NULL as input buffer +* Ensure that nothing has been converted. + +Signed-off-by: Nikita Popov + +CVE: CVE-2021-43396 +Upstream-Status: Backport [ff012870b2c02a62598c04daa1e54632e020fd7d] +--- + iconvdata/Makefile | 5 +++- + iconvdata/bug-iconv15.c | 60 +++++++++++++++++++++++++++++++++++++++ + iconvdata/iso-2022-jp-3.c | 28 ++++++++++++------ + 3 files changed, 84 insertions(+), 9 deletions(-) + create mode 100644 iconvdata/bug-iconv15.c + +diff --git a/iconvdata/Makefile b/iconvdata/Makefile +index c216f959df..d5507a048c 100644 +--- a/iconvdata/Makefile ++++ b/iconvdata/Makefile +@@ -1,4 +1,5 @@ + # Copyright (C) 1997-2021 Free Software Foundation, Inc. ++# Copyright (C) The GNU Toolchain Authors. + # This file is part of the GNU C Library. + + # The GNU C Library is free software; you can redistribute it and/or +@@ -74,7 +75,7 @@ ifeq (yes,$(build-shared)) + tests = bug-iconv1 bug-iconv2 tst-loading tst-e2big tst-iconv4 bug-iconv4 \ + tst-iconv6 bug-iconv5 bug-iconv6 tst-iconv7 bug-iconv8 bug-iconv9 \ + bug-iconv10 bug-iconv11 bug-iconv12 tst-iconv-big5-hkscs-to-2ucs4 \ +- bug-iconv13 bug-iconv14 ++ bug-iconv13 bug-iconv14 bug-iconv15 + ifeq ($(have-thread-library),yes) + tests += bug-iconv3 + endif +@@ -327,6 +328,8 @@ $(objpfx)bug-iconv12.out: $(addprefix $(objpfx), $(gconv-modules)) \ + $(addprefix $(objpfx),$(modules.so)) + $(objpfx)bug-iconv14.out: $(addprefix $(objpfx), $(gconv-modules)) \ + $(addprefix $(objpfx),$(modules.so)) ++$(objpfx)bug-iconv15.out: $(addprefix $(objpfx), $(gconv-modules)) \ ++ $(addprefix $(objpfx),$(modules.so)) + + $(objpfx)iconv-test.out: run-iconv-test.sh \ + $(addprefix $(objpfx), $(gconv-modules)) \ +diff --git a/iconvdata/bug-iconv15.c b/iconvdata/bug-iconv15.c +new file mode 100644 +index 0000000000..cc04bd0313 +--- /dev/null ++++ b/iconvdata/bug-iconv15.c +@@ -0,0 +1,60 @@ ++/* Bug 28524: Conversion from ISO-2022-JP-3 with iconv ++ may emit spurious NUL character on state reset. ++ Copyright (C) The GNU Toolchain Authors. ++ This file is part of the GNU C Library. ++ ++ The GNU C Library is free software; you can redistribute it and/or ++ modify it under the terms of the GNU Lesser General Public ++ License as published by the Free Software Foundation; either ++ version 2.1 of the License, or (at your option) any later version. ++ ++ The GNU C Library is distributed in the hope that it will be useful, ++ but WITHOUT ANY WARRANTY; without even the implied warranty of ++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ++ Lesser General Public License for more details. ++ ++ You should have received a copy of the GNU Lesser General Public ++ License along with the GNU C Library; if not, see ++ . */ ++ ++#include ++#include ++#include ++ ++static int ++do_test (void) ++{ ++ char in[] = "\x1b(I"; ++ char *inbuf = in; ++ size_t inleft = sizeof (in) - 1; ++ char out[1]; ++ char *outbuf = out; ++ size_t outleft = sizeof (out); ++ iconv_t cd; ++ ++ cd = iconv_open ("UTF8", "ISO-2022-JP-3"); ++ TEST_VERIFY_EXIT (cd != (iconv_t) -1); ++ ++ /* First call to iconv should alter internal state. ++ Now, JISX0201_Kana_set is selected and ++ state value != ASCII_set. */ ++ TEST_VERIFY (iconv (cd, &inbuf, &inleft, &outbuf, &outleft) != (size_t) -1); ++ ++ /* No bytes should have been added to ++ the output buffer at this point. */ ++ TEST_VERIFY (outbuf == out); ++ TEST_VERIFY (outleft == sizeof (out)); ++ ++ /* Second call shall emit spurious NUL character in unpatched glibc. */ ++ TEST_VERIFY (iconv (cd, NULL, NULL, &outbuf, &outleft) != (size_t) -1); ++ ++ /* No characters are expected to be produced. */ ++ TEST_VERIFY (outbuf == out); ++ TEST_VERIFY (outleft == sizeof (out)); ++ ++ TEST_VERIFY_EXIT (iconv_close (cd) != -1); ++ ++ return 0; ++} ++ ++#include +diff --git a/iconvdata/iso-2022-jp-3.c b/iconvdata/iso-2022-jp-3.c +index 70b28ace7f..d724126545 100644 +--- a/iconvdata/iso-2022-jp-3.c ++++ b/iconvdata/iso-2022-jp-3.c +@@ -1,5 +1,6 @@ + /* Conversion module for ISO-2022-JP-3. + Copyright (C) 1998-2021 Free Software Foundation, Inc. ++ Copyright (C) The GNU Toolchain Authors. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or +@@ -79,20 +80,31 @@ enum + the output state to the initial state. This has to be done during the + flushing. */ + #define EMIT_SHIFT_TO_INIT \ +- if (data->__statep->__count != ASCII_set) \ ++ if ((data->__statep->__count & ~7) != ASCII_set) \ + { \ + if (FROM_DIRECTION) \ + { \ +- if (__glibc_likely (outbuf + 4 <= outend)) \ ++ uint32_t ch = data->__statep->__count >> 6; \ ++ \ ++ if (__glibc_unlikely (ch != 0)) \ + { \ +- /* Write out the last character. */ \ +- *((uint32_t *) outbuf) = data->__statep->__count >> 6; \ +- outbuf += sizeof (uint32_t); \ +- data->__statep->__count = ASCII_set; \ ++ if (__glibc_likely (outbuf + 4 <= outend)) \ ++ { \ ++ /* Write out the last character. */ \ ++ put32u (outbuf, ch); \ ++ outbuf += 4; \ ++ data->__statep->__count &= 7; \ ++ data->__statep->__count |= ASCII_set; \ ++ } \ ++ else \ ++ /* We don't have enough room in the output buffer. */ \ ++ status = __GCONV_FULL_OUTPUT; \ + } \ + else \ +- /* We don't have enough room in the output buffer. */ \ +- status = __GCONV_FULL_OUTPUT; \ ++ { \ ++ data->__statep->__count &= 7; \ ++ data->__statep->__count |= ASCII_set; \ ++ } \ + } \ + else \ + { \ +-- +2.27.0 + diff --git a/meta/recipes-core/glibc/glibc_2.33.bb b/meta/recipes-core/glibc/glibc_2.33.bb index ad5e2b8eb1..38b8a8b065 100644 --- a/meta/recipes-core/glibc/glibc_2.33.bb +++ b/meta/recipes-core/glibc/glibc_2.33.bb @@ -56,6 +56,7 @@ SRC_URI = "${GLIBC_GIT_URI};branch=${SRCBRANCH};name=glibc \ file://0028-readlib-Add-OECORE_KNOWN_INTERPRETER_NAMES-to-known-.patch \ file://0029-wordsize.h-Unify-the-header-between-arm-and-aarch64.patch \ file://0030-powerpc-Do-not-ask-compiler-for-finding-arch.patch \ + file://0031-CVE-2021-43396.patch \ " S = "${WORKDIR}/git" B = "${WORKDIR}/build-${TARGET_SYS}"