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Resolves: CVE-2018-17942 - fix heap-based buffer overflow in vasnprintf()

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This commit is contained in:
Kamil Dudka 2018-10-11 14:39:02 +02:00
parent 7c7259b187
commit 71b79ae180
2 changed files with 76 additions and 1 deletions
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69
coreutils-8.30-CVE-2018-17942.patch Normal file
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@ -0,0 +1,69 @@
From 6d059cebfdefbdf56910a858f8b603d37f10ef6d Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Sun, 23 Sep 2018 14:13:52 +0200
Subject: [PATCH] vasnprintf: Fix heap memory overrun bug.
Reported by Ben Pfaff <blp@cs.stanford.edu> in
<https://lists.gnu.org/archive/html/bug-gnulib/2018-09/msg00107.html>.
* lib/vasnprintf.c (convert_to_decimal): Allocate one more byte of
memory.
* tests/test-vasnprintf.c (test_function): Add another test.
Upstream-commit: 278b4175c9d7dd47c1a3071554aac02add3b3c35
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
gnulib-tests/test-vasnprintf.c | 21 ++++++++++++++++++++-
lib/vasnprintf.c | 4 +++-
2 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/gnulib-tests/test-vasnprintf.c b/gnulib-tests/test-vasnprintf.c
index 19731bc..93d81d7 100644
--- a/gnulib-tests/test-vasnprintf.c
+++ b/gnulib-tests/test-vasnprintf.c
@@ -53,7 +53,26 @@ test_function (char * (*my_asnprintf) (char *, size_t *, const char *, ...))
ASSERT (result != NULL);
ASSERT (strcmp (result, "12345") == 0);
ASSERT (length == 5);
- if (size < 6)
+ if (size < 5 + 1)
+ ASSERT (result != buf);
+ ASSERT (memcmp (buf + size, &"DEADBEEF"[size], 8 - size) == 0);
+ if (result != buf)
+ free (result);
+ }
+
+ /* Note: This test assumes IEEE 754 representation of 'double' floats. */
+ for (size = 0; size <= 8; size++)
+ {
+ size_t length;
+ char *result;
+
+ memcpy (buf, "DEADBEEF", 8);
+ length = size;
+ result = my_asnprintf (buf, &length, "%2.0f", 1.6314159265358979e+125);
+ ASSERT (result != NULL);
+ ASSERT (strcmp (result, "163141592653589790215729350939528493057529598899734151772468186268423257777068536614838678161083520756952076273094236944990208") == 0);
+ ASSERT (length == 126);
+ if (size < 126 + 1)
ASSERT (result != buf);
ASSERT (memcmp (buf + size, &"DEADBEEF"[size], 8 - size) == 0);
if (result != buf)
diff --git a/lib/vasnprintf.c b/lib/vasnprintf.c
index 3b441d0..48ef7a6 100644
--- a/lib/vasnprintf.c
+++ b/lib/vasnprintf.c
@@ -860,7 +860,9 @@ convert_to_decimal (mpn_t a, size_t extra_zeroes)
size_t a_len = a.nlimbs;
/* 0.03345 is slightly larger than log(2)/(9*log(10)). */
size_t c_len = 9 * ((size_t)(a_len * (GMP_LIMB_BITS * 0.03345f)) + 1);
- char *c_ptr = (char *) malloc (xsum (c_len, extra_zeroes));
+ /* We need extra_zeroes bytes for zeroes, followed by c_len bytes for the
+ digits of a, followed by 1 byte for the terminating NUL. */
+ char *c_ptr = (char *) malloc (xsum (xsum (extra_zeroes, c_len), 1));
if (c_ptr != NULL)
{
char *d_ptr = c_ptr;
--
2.17.1

8
coreutils.spec
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@ -1,7 +1,7 @@
Summary: A set of basic GNU tools commonly used in shell scripts
Name: coreutils
Version: 8.30
Release: 4%{?dist}
Release: 5%{?dist}
License: GPLv3+
Group: System Environment/Base
Url: https://www.gnu.org/software/coreutils/
@ -17,6 +17,9 @@ Source106: coreutils-colorls.csh
# rename gnulib's renameat2 to renameatu to avoid clash with glibc (#1598518)
Patch1: coreutils-8.30-renameatu.patch
# fix heap-based buffer overflow in vasnprintf() (CVE-2018-17942)
Patch2: coreutils-8.30-CVE-2018-17942.patch
# disable the test-lock gnulib test prone to deadlock
Patch100: coreutils-8.26-test-lock.patch
@ -252,6 +255,9 @@ fi
%license COPYING
%changelog
* Thu Oct 11 2018 Kamil Dudka <kdudka@redhat.com> - 8.30-5
- fix heap-based buffer overflow in vasnprintf() (CVE-2018-17942)
* Thu Jul 12 2018 Fedora Release Engineering <releng@fedoraproject.org> - 8.30-4
- Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild