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package/gmp: fix CVE-2021-43618

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GNU Multiple Precision Arithmetic Library (GMP) through 6.2.1 has an
mpz/inp_raw.c integer overflow and resultant buffer overflow via crafted
input, leading to a segmentation fault on 32-bit platforms.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
This commit is contained in:
Fabrice Fontaine 2021-11-22 23:44:07 +01:00 committed by Arnout Vandecappelle (Essensium/Mind)
parent 0fcf166db0
commit 9d0536d82d
2 changed files with 30 additions and 0 deletions
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27
package/gmp/0001-mpz-inp_raw.c-Avoid-bit-size-overflows.patch Normal file
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@ -0,0 +1,27 @@
# HG changeset patch
# User Marco Bodrato <bodrato@mail.dm.unipi.it>
# Date 1634836009 -7200
# Node ID 561a9c25298e17bb01896801ff353546c6923dbd
# Parent e1fd9db13b475209a864577237ea4b9105b3e96e
mpz/inp_raw.c: Avoid bit size overflows
[Retrieved from: https://gmplib.org/repo/gmp-6.2/rev/561a9c25298e]
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
diff -r e1fd9db13b47 -r 561a9c25298e mpz/inp_raw.c
--- a/mpz/inp_raw.c Tue Dec 22 23:49:51 2020 +0100
+++ b/mpz/inp_raw.c Thu Oct 21 19:06:49 2021 +0200
@@ -88,8 +88,11 @@
abs_csize = ABS (csize);
+ if (UNLIKELY (abs_csize > ~(mp_bitcnt_t) 0 / 8))
+ return 0; /* Bit size overflows */
+
/* round up to a multiple of limbs */
- abs_xsize = BITS_TO_LIMBS (abs_csize*8);
+ abs_xsize = BITS_TO_LIMBS ((mp_bitcnt_t) abs_csize * 8);
if (abs_xsize != 0)
{

3
package/gmp/gmp.mk
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@ -14,6 +14,9 @@ GMP_CPE_ID_VENDOR = gmplib
GMP_DEPENDENCIES = host-m4
HOST_GMP_DEPENDENCIES = host-m4
# 0001-mpz-inp_raw.c-Avoid-bit-size-overflows.patch
GMP_IGNORE_CVES += CVE-2021-43618
# GMP doesn't support assembly for coldfire or mips r6 ISA yet
# Disable for ARM v7m since it has different asm constraints
ifeq ($(BR2_m68k_cf)$(BR2_MIPS_CPU_MIPS32R6)$(BR2_MIPS_CPU_MIPS64R6)$(BR2_ARM_CPU_ARMV7M),y)