fix CVE-2021-20266

CVE-2021-20266.patch

@@ -0,0 +1,102 @@
+From 8f4b3c3cab8922a2022b9e47c71f1ecf906077ef Mon Sep 17 00:00:00 2001
+From: Demi Marie Obenour <athena@invisiblethingslab.com>
+Date: Mon, 8 Feb 2021 16:05:01 -0500
+Subject: [PATCH] hdrblobInit() needs bounds checks too
+
+Users can pass untrusted data to hdrblobInit() and it must be robust
+against this.
+---
+ lib/header.c | 48 +++++++++++++++++++++++++++++++-----------------
+ 1 file changed, 31 insertions(+), 17 deletions(-)
+
+diff --git a/lib/header.c b/lib/header.c
+index ea39e679f4..ebba9c2b09 100644
+--- a/lib/header.c
++++ b/lib/header.c
+@@ -11,6 +11,7 @@
+ #include "system.h"
+ #include <netdb.h>
+ #include <errno.h>
++#include <inttypes.h>
+ #include <rpm/rpmtypes.h>
+ #include <rpm/rpmstring.h>
+ #include "lib/header_internal.h"
+@@ -1912,6 +1913,25 @@ hdrblob hdrblobFree(hdrblob blob)
+     return NULL;
+ }
+ 
++static rpmRC hdrblobVerifyLengths(rpmTagVal regionTag, uint32_t il, uint32_t dl,
++				  char **emsg) {
++    uint32_t il_max = HEADER_TAGS_MAX;
++    uint32_t dl_max = HEADER_DATA_MAX;
++    if (regionTag == RPMTAG_HEADERSIGNATURES) {
++	il_max = 32;
++	dl_max = 64 * 1024 * 1024;
++    }
++    if (hdrchkRange(il_max, il)) {
++	rasprintf(emsg, _("hdr tags: BAD, no. of tags(%" PRIu32 ") out of range"), il);
++	return RPMRC_FAIL;
++    }
++    if (hdrchkRange(dl_max, dl)) {
++	rasprintf(emsg, _("hdr data: BAD, no. of bytes(%" PRIu32 ") out of range"), dl);
++	return RPMRC_FAIL;
++    }
++    return RPMRC_OK;
++}
++
+ rpmRC hdrblobRead(FD_t fd, int magic, int exact_size, rpmTagVal regionTag, hdrblob blob, char **emsg)
+ {
+     int32_t block[4];
+@@ -1924,13 +1944,6 @@ rpmRC hdrblobRead(FD_t fd, int magic, int exact_size, rpmTagVal regionTag, hdrbl
+     size_t nb;
+     rpmRC rc = RPMRC_FAIL;		/* assume failure */
+     int xx;
+-    int32_t il_max = HEADER_TAGS_MAX;
+-    int32_t dl_max = HEADER_DATA_MAX;
+-
+-    if (regionTag == RPMTAG_HEADERSIGNATURES) {
+-	il_max = 32;
+-	dl_max = 64 * 1024 * 1024;
+-    }
+ 
+     memset(block, 0, sizeof(block));
+     if ((xx = Freadall(fd, bs, blen)) != blen) {
+@@ -1943,15 +1956,9 @@ rpmRC hdrblobRead(FD_t fd, int magic, int exact_size, rpmTagVal regionTag, hdrbl
+ 	goto exit;
+     }
+     il = ntohl(block[2]);
+-    if (hdrchkRange(il_max, il)) {
+-	rasprintf(emsg, _("hdr tags: BAD, no. of tags(%d) out of range"), il);
+-	goto exit;
+-    }
+     dl = ntohl(block[3]);
+-    if (hdrchkRange(dl_max, dl)) {
+-	rasprintf(emsg, _("hdr data: BAD, no. of bytes(%d) out of range"), dl);
++    if (hdrblobVerifyLengths(regionTag, il, dl, emsg))
+ 	goto exit;
+-    }
+ 
+     nb = (il * sizeof(struct entryInfo_s)) + dl;
+     uc = sizeof(il) + sizeof(dl) + nb;
+@@ -1995,11 +2002,18 @@ rpmRC hdrblobInit(const void *uh, size_t uc,
+ 		struct hdrblob_s *blob, char **emsg)
+ {
+     rpmRC rc = RPMRC_FAIL;
+-
+     memset(blob, 0, sizeof(*blob));
++    if (uc && uc < 8) {
++	rasprintf(emsg, _("hdr length: BAD"));
++	goto exit;
++    }
++
+     blob->ei = (int32_t *) uh; /* discards const */
+-    blob->il = ntohl(blob->ei[0]);
+-    blob->dl = ntohl(blob->ei[1]);
++    blob->il = ntohl((uint32_t)(blob->ei[0]));
++    blob->dl = ntohl((uint32_t)(blob->ei[1]));
++    if (hdrblobVerifyLengths(regionTag, blob->il, blob->dl, emsg) != RPMRC_OK)
++	goto exit;
++
+     blob->pe = (entryInfo) &(blob->ei[2]);
+     blob->pvlen = sizeof(blob->il) + sizeof(blob->dl) +
+ 		  (blob->il * sizeof(*blob->pe)) + blob->dl;

rpm.spec

@@ -1,6 +1,6 @@
 Name:          rpm
 Version:       4.15.1
-Release:       23
+Release:       24
 Summary:       RPM Package Manager
 License:       GPLv2+
 URL:           http://www.rpm.org/
@@ -50,6 +50,7 @@ Patch39: backport-Fix-logic-error-in-grabArgs.patch
 Patch40: backport-Use-libelf-for-determining-file-colors.patch
 Patch41: backport-CVE-2021-20271.patch
 Patch42: backport-optimize-signature-header-merge-a-bit.patch
+Patch43: CVE-2021-20266.patch
 
 BuildRequires: gcc autoconf automake libtool make gawk popt-devel openssl-devel readline-devel libdb-devel 
 BuildRequires: zlib-devel libzstd-devel xz-devel bzip2-devel libarchive-devel ima-evm-utils-devel
@@ -298,6 +299,12 @@ make check || (cat tests/rpmtests.log; exit 0)
 %{_mandir}/man1/gendiff.1*
 
 %changelog
+* Wed Jun 2 2021 guoxiaoqi<guoxiaoqi2@huawei.com> - 4.15.1-23
+- Type:cve
+- ID:NA
+- SUG:NA
+- DESC:fix CVE-2021-20266
+
 * Sat May 22 2021 liudabo<liudabo1@huawei.com> - 4.15.1-22
 - Type:bugfix
 - ID:NA