forked from rpms/glibc
1bea1361dc
Upstream commit: 31da30f23cddd36db29d5b6a1c7619361b271fb4 - iconv: ISO-2022-CN-EXT: fix out-of-bound writes when writing escape sequence (CVE-2024-2961) - x86_64: Exclude SSE, AVX and FMA4 variants in libm multiarch - Apply the Makefile sorting fix - powerpc: Fix ld.so address determination for PCREL mode (bug 31640) - x86-64: Simplify minimum ISA check ifdef conditional with if - x86-64: Don't use SSE resolvers for ISA level 3 or above - AArch64: Check kernel version for SVE ifuncs - aarch64: fix check for SVE support in assembler - aarch64/fpu: Sync libmvec routines from 2.39 and before with AOR - i386: Use generic memrchr in libc (bug 31316)
208 lines
6.8 KiB
Diff
208 lines
6.8 KiB
Diff
commit 31da30f23cddd36db29d5b6a1c7619361b271fb4
|
|
Author: Charles Fol <folcharles@gmail.com>
|
|
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 <adhemerval.zanella@linaro.org>
|
|
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
|
|
Tested-by: Carlos O'Donell <carlos@redhat.com>
|
|
|
|
(cherry picked from commit f9dc609e06b1136bb0408be9605ce7973a767ada)
|
|
|
|
diff --git a/iconvdata/Makefile b/iconvdata/Makefile
|
|
index ea019ce5c0e67e98..7196a8744bb66e8c 100644
|
|
--- a/iconvdata/Makefile
|
|
+++ b/iconvdata/Makefile
|
|
@@ -75,7 +75,8 @@ ifeq (yes,$(build-shared))
|
|
tests = bug-iconv1 bug-iconv2 tst-loading tst-e2big tst-iconv4 bug-iconv4 \
|
|
tst-iconv6 bug-iconv5 bug-iconv6 tst-iconv7 bug-iconv8 bug-iconv9 \
|
|
bug-iconv10 bug-iconv11 bug-iconv12 tst-iconv-big5-hkscs-to-2ucs4 \
|
|
- bug-iconv13 bug-iconv14 bug-iconv15
|
|
+ bug-iconv13 bug-iconv14 bug-iconv15 \
|
|
+ tst-iconv-iso-2022-cn-ext
|
|
ifeq ($(have-thread-library),yes)
|
|
tests += bug-iconv3
|
|
endif
|
|
@@ -330,6 +331,8 @@ $(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 b34c8a36f4564c11..cce29b19692263d6 100644
|
|
--- a/iconvdata/iso-2022-cn-ext.c
|
|
+++ b/iconvdata/iso-2022-cn-ext.c
|
|
@@ -574,6 +574,12 @@ 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; \
|
|
@@ -587,6 +593,12 @@ 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
|
|
+ <https://www.gnu.org/licenses/>. */
|
|
+
|
|
+#include <stdio.h>
|
|
+#include <string.h>
|
|
+
|
|
+#include <errno.h>
|
|
+#include <iconv.h>
|
|
+#include <sys/mman.h>
|
|
+
|
|
+#include <support/xunistd.h>
|
|
+#include <support/check.h>
|
|
+#include <support/support.h>
|
|
+
|
|
+/* 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 <support/test-driver.c>
|