diff --git a/SOURCES/glibc-RHEL-32475.patch b/SOURCES/glibc-RHEL-32475.patch new file mode 100644 index 0000000..21f8672 --- /dev/null +++ b/SOURCES/glibc-RHEL-32475.patch @@ -0,0 +1,203 @@ +Author: Charles Fol +Date: Thu Mar 28 12:25:38 2024 -0300 + + iconv: ISO-2022-CN-EXT: fix out-of-bound writes when writing escape sequence (CVE-2024-2961) + + ISO-2022-CN-EXT uses escape sequences to indicate character set changes + (as specified by RFC 1922). While the SOdesignation has the expected + bounds checks, neither SS2designation nor SS3designation have its; + allowing a write overflow of 1, 2, or 3 bytes with fixed values: + '$+I', '$+J', '$+K', '$+L', '$+M', or '$*H'. + + Checked on aarch64-linux-gnu. + + Co-authored-by: Adhemerval Zanella + Reviewed-by: Carlos O'Donell + Tested-by: Carlos O'Donell + +diff --git a/iconvdata/Makefile b/iconvdata/Makefile +index 646e2ccd11478646..c959758a90ed954f 100644 +--- a/iconvdata/Makefile ++++ b/iconvdata/Makefile +@@ -75,7 +75,7 @@ ifeq (yes,$(build-shared)) + tests = bug-iconv1 bug-iconv2 tst-loading tst-e2big tst-iconv4 bug-iconv4 \ + tst-iconv6 bug-iconv5 bug-iconv6 tst-iconv7 bug-iconv8 bug-iconv9 \ + bug-iconv10 bug-iconv11 bug-iconv12 bug-iconv13 bug-iconv14 \ +- bug-iconv15 ++ bug-iconv15 tst-iconv-iso-2022-cn-ext + ifeq ($(have-thread-library),yes) + tests += bug-iconv3 + endif +@@ -325,6 +325,8 @@ $(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)tst-iconv-iso-2022-cn-ext.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/iso-2022-cn-ext.c b/iconvdata/iso-2022-cn-ext.c +index c21a7187b4d7808e..bd9493c12d95070b 100644 +--- a/iconvdata/iso-2022-cn-ext.c ++++ b/iconvdata/iso-2022-cn-ext.c +@@ -575,6 +575,12 @@ DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized"); + { \ + const char *escseq; \ + \ ++ if (outptr + 4 > outend) \ ++ { \ ++ result = __GCONV_FULL_OUTPUT; \ ++ break; \ ++ } \ ++ \ + assert (used == CNS11643_2_set); /* XXX */ \ + escseq = "*H"; \ + *outptr++ = ESC; \ +@@ -588,6 +594,12 @@ DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized"); + { \ + const char *escseq; \ + \ ++ if (outptr + 4 > outend) \ ++ { \ ++ result = __GCONV_FULL_OUTPUT; \ ++ break; \ ++ } \ ++ \ + assert ((used >> 5) >= 3 && (used >> 5) <= 7); \ + escseq = "+I+J+K+L+M" + ((used >> 5) - 3) * 2; \ + *outptr++ = ESC; \ +diff --git a/iconvdata/tst-iconv-iso-2022-cn-ext.c b/iconvdata/tst-iconv-iso-2022-cn-ext.c +new file mode 100644 +index 0000000000000000..96a8765fd5369681 +--- /dev/null ++++ b/iconvdata/tst-iconv-iso-2022-cn-ext.c +@@ -0,0 +1,128 @@ ++/* Verify ISO-2022-CN-EXT does not write out of the bounds. ++ Copyright (C) 2024 Free Software Foundation, Inc. ++ 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 ++#include ++#include ++ ++#include ++#include ++#include ++ ++/* The test sets up a two memory page buffer with the second page marked ++ PROT_NONE to trigger a fault if the conversion writes beyond the exact ++ expected amount. Then we carry out various conversions and precisely ++ place the start of the output buffer in order to trigger a SIGSEGV if the ++ process writes anywhere between 1 and page sized bytes more (only one ++ PROT_NONE page is setup as a canary) than expected. These tests exercise ++ all three of the cases in ISO-2022-CN-EXT where the converter must switch ++ character sets and may run out of buffer space while doing the ++ operation. */ ++ ++static int ++do_test (void) ++{ ++ iconv_t cd = iconv_open ("ISO-2022-CN-EXT", "UTF-8"); ++ TEST_VERIFY_EXIT (cd != (iconv_t) -1); ++ ++ char *ntf; ++ size_t ntfsize; ++ char *outbufbase; ++ { ++ int pgz = getpagesize (); ++ TEST_VERIFY_EXIT (pgz > 0); ++ ntfsize = 2 * pgz; ++ ++ ntf = xmmap (NULL, ntfsize, PROT_READ | PROT_WRITE, MAP_PRIVATE ++ | MAP_ANONYMOUS, -1); ++ xmprotect (ntf + pgz, pgz, PROT_NONE); ++ ++ outbufbase = ntf + pgz; ++ } ++ ++ /* Check if SOdesignation escape sequence does not trigger an OOB write. */ ++ { ++ char inbuf[] = "\xe4\xba\xa4\xe6\x8d\xa2"; ++ ++ for (int i = 0; i < 9; i++) ++ { ++ char *inp = inbuf; ++ size_t inleft = sizeof (inbuf) - 1; ++ ++ char *outp = outbufbase - i; ++ size_t outleft = i; ++ ++ TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft) ++ == (size_t) -1); ++ TEST_COMPARE (errno, E2BIG); ++ ++ TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0); ++ } ++ } ++ ++ /* Same as before for SS2designation. */ ++ { ++ char inbuf[] = "㴽 \xe3\xb4\xbd"; ++ ++ for (int i = 0; i < 14; i++) ++ { ++ char *inp = inbuf; ++ size_t inleft = sizeof (inbuf) - 1; ++ ++ char *outp = outbufbase - i; ++ size_t outleft = i; ++ ++ TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft) ++ == (size_t) -1); ++ TEST_COMPARE (errno, E2BIG); ++ ++ TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0); ++ } ++ } ++ ++ /* Same as before for SS3designation. */ ++ { ++ char inbuf[] = "劄 \xe5\x8a\x84"; ++ ++ for (int i = 0; i < 14; i++) ++ { ++ char *inp = inbuf; ++ size_t inleft = sizeof (inbuf) - 1; ++ ++ char *outp = outbufbase - i; ++ size_t outleft = i; ++ ++ TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft) ++ == (size_t) -1); ++ TEST_COMPARE (errno, E2BIG); ++ ++ TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0); ++ } ++ } ++ ++ TEST_VERIFY_EXIT (iconv_close (cd) != -1); ++ ++ xmunmap (ntf, ntfsize); ++ ++ return 0; ++} ++ ++#include diff --git a/SPECS/glibc.spec b/SPECS/glibc.spec index f0d6d3f..638e919 100644 --- a/SPECS/glibc.spec +++ b/SPECS/glibc.spec @@ -132,7 +132,7 @@ end \ Summary: The GNU libc libraries Name: glibc Version: %{glibcversion} -Release: %{glibcrelease}.12 +Release: %{glibcrelease}.13 # In general, GPLv2+ is used by programs, LGPLv2+ is used for # libraries. @@ -1061,6 +1061,7 @@ Patch873: glibc-RHEL-21519.patch Patch874: glibc-RHEL-22441.patch Patch875: glibc-RHEL-22846.patch Patch876: glibc-RHEL-22847.patch +Patch877: glibc-RHEL-32475.patch ############################################################################## # Continued list of core "glibc" package information: @@ -2891,6 +2892,9 @@ fi %files -f compat-libpthread-nonshared.filelist -n compat-libpthread-nonshared %changelog +* Tue Apr 16 2024 Florian Weimer - 2.28-236.13 +- CVE-2024-2961: Out of bounds write in iconv conversion to ISO-2022-CN-EXT (RHEL-32475) + * Mon Jan 29 2024 Florian Weimer - 2.28-236.12 - Re-enable output buffering for wide stdio streams (RHEL-22847)