bsdiff: Add patches for CVEs

Add two patches from Debian fixing CVEs in the bsdiff application. CVE-2014-9862: Heap vulnerability in bspatch CVE-2020-14315: Memory Corruption Vulnerability in bspatch Copied the patches from this location: https://salsa.debian.org/debian/bsdiff/-/blob/debian/latest/debian/patches/20-CVE-2014-9862.patch https://salsa.debian.org/debian/bsdiff/-/blob/debian/latest/debian/patches/33-CVE-2020-14315.patch Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2024-11-08 07:49:21 +01:00 · 2023-10-07 21:07:20 +02:00 · 2023-10-07 21:07:20 +02:00 · cac723e8b8
commit cac723e8b8
parent f4ee08677c
4 changed files with 433 additions and 13 deletions
--- a/package/utils/bsdiff/Makefile
+++ b/package/utils/bsdiff/Makefile
@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk

 PKG_NAME:=bsdiff
 PKG_VERSION:=4.3
-PKG_RELEASE:=1
+PKG_RELEASE:=2

 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://www.daemonology.net/bsdiff/
--- a/package/utils/bsdiff/patches/001-musl.patch
+++ b/package/utils/bsdiff/patches/001-musl.patch
@ -1,6 +1,6 @@
--- a/bsdiff.c	2005-08-17 00:13:52.000000000 +0200
-+++ b/bsdiff.c	2016-02-21 01:39:31.157915765 +0100
-@@ -101,7 +101,7 @@
+--- a/bsdiff.c
+++ b/bsdiff.c
+@@ -101,7 +101,7 @@ static void split(off_t *I,off_t *V,off_
 	if(start+len>kk) split(I,V,kk,start+len-kk,h);
 }
 
@ -9,7 +9,7 @@
 {
 	off_t buckets[256];
 	off_t i,h,len;
-@@ -139,7 +139,7 @@
+@@ -139,7 +139,7 @@ static void qsufsort(off_t *I,off_t *V,u
 	for(i=0;i<oldsize+1;i++) I[V[i]]=i;
 }
 
@ -18,7 +18,7 @@
 {
 	off_t i;
 
-@@ -149,8 +149,8 @@
+@@ -149,8 +149,8 @@ static off_t matchlen(u_char *old,off_t
 	return i;
 }
 
@ -29,7 +29,7 @@
 {
 	off_t x,y;
 
-@@ -175,7 +175,7 @@
+@@ -175,7 +175,7 @@ static off_t search(off_t *I,u_char *old
 	};
 }
 
@ -38,7 +38,7 @@
 {
 	off_t y;
 
-@@ -196,7 +196,7 @@
+@@ -196,7 +196,7 @@ static void offtout(off_t x,u_char *buf)
 int main(int argc,char *argv[])
 {
 	int fd;
@ -47,7 +47,7 @@
 	off_t oldsize,newsize;
 	off_t *I,*V;
 	off_t scan,pos,len;
-@@ -206,9 +206,9 @@
+@@ -206,9 +206,9 @@ int main(int argc,char *argv[])
 	off_t overlap,Ss,lens;
 	off_t i;
 	off_t dblen,eblen;
@ -60,9 +60,9 @@
 	FILE * pf;
 	BZFILE * pfbz2;
 	int bz2err;
--- a/bspatch.c	2005-08-17 00:14:00.000000000 +0200
-+++ b/bspatch.c	2016-02-21 01:39:29.753859970 +0100
-@@ -36,7 +36,7 @@
+--- a/bspatch.c
+++ b/bspatch.c
+@@ -36,7 +36,7 @@ __FBSDID("$FreeBSD: src/usr.bin/bsdiff/b
 #include <unistd.h>
 #include <fcntl.h>
 
@ -71,7 +71,7 @@
 {
 	off_t y;
 
-@@ -62,8 +62,8 @@
+@@ -62,8 +62,8 @@ int main(int argc,char * argv[])
 	int fd;
 	ssize_t oldsize,newsize;
 	ssize_t bzctrllen,bzdatalen;
--- a/package/utils/bsdiff/patches/020-CVE-2014-9862.patch
+++ b/package/utils/bsdiff/patches/020-CVE-2014-9862.patch
@ -0,0 +1,37 @@
+From: The FreeBSD Project
+Bug: https://security-tracker.debian.org/tracker/CVE-2014-9862
+Subject: CVE-2014-9862 - check for a negative value on numbers of bytes
+  The implementation of bspatch does not check for a negative value on numbers
+  of bytes read from the diff and extra streams, allowing an attacker who
+  can control the patch file to write at arbitrary locations in the heap.
+  .
+  bspatch's main loop reads three numbers from the "control" stream in
+  the patch: X, Y and Z. The first two are the number of bytes to read
+  from "diff" and "extra" (and thus only non-negative), while the
+  third one could be positive or negative and moves the oldpos pointer
+  on the source image. These 3 values are 64bits signed ints (encoded
+  somehow on the file) that are later passed the function that reads
+  from the streams, but those values are not verified to be
+  non-negative.
+  .
+  Official report https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9862
+  The patch was downloaded from a link pointed by
+  https://security.freebsd.org/advisories/FreeBSD-SA-16:25.bsp
+
+---
+ bspatch.c |    4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/bspatch.c
+++ b/bspatch.c
+@@ -152,6 +152,10 @@ int main(int argc,char * argv[])
+ 		};
+ 
+ 		/* Sanity-check */
+		if ((ctrl[0] < 0) || (ctrl[1] < 0))
+			errx(1,"Corrupt patch\n");
+
+		/* Sanity-check */
+ 		if(newpos+ctrl[0]>newsize)
+ 			errx(1,"Corrupt patch\n");
+ 
--- a/package/utils/bsdiff/patches/033-CVE-2020-14315.patch
+++ b/package/utils/bsdiff/patches/033-CVE-2020-14315.patch
@ -0,0 +1,383 @@
+Description: patch for CVE-2020-14315
+ A memory corruption vulnerability is present in bspatch as shipped in
+ Colin Percival’s bsdiff tools version 4.3. Insufficient checks when
+ handling external inputs allows an attacker to bypass the sanity checks
+ in place and write out of a dynamically allocated buffer boundaries.
+Source: https://svnweb.freebsd.org/base/head/usr.bin/bsdiff/bspatch/bspatch.c?revision=352742&view=co
+Author: tony mancill <tmancill@debian.org>
+Comment: The patch was created by comparing the Debian sources to the
+ "Confirmed Patched Version" [1] documented in the
+ X41 D-SEC GmbH Security Advisory: X41-2020-006 [2].
+ References to FreeBSD capsicum have been dropped.  Definitions for
+ TYPE_MINIMUM and TYPE_MAXIMUM have been borrowed from the Debian
+ coreutils package sources but originate in gnulib [3] and are used to
+ define OFF_MIN and OFF_MAX (limits of off_t). Whitespace changes from
+ the confirmed patched version are also included and keep the difference
+ between the Debian sources and the confirmed patched version minimal.
+ .
+ [1] https://svnweb.freebsd.org/base/head/usr.bin/bsdiff/bspatch/bspatch.c?revision=352742&view=co
+ [2] https://www.openwall.com/lists/oss-security/2020/07/09/2
+ [3] https://www.gnu.org/software/gnulib/
+Last-Update: 2021-04-03
+Forwarded: not-needed
+Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964796
+
+--- a/bspatch.c
+++ b/bspatch.c
+@@ -1,4 +1,6 @@
+ /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+  * Copyright 2003-2005 Colin Percival
+  * All rights reserved
+  *
+@@ -25,55 +27,147 @@
+  */
+ 
+ #if 0
+-__FBSDID("$FreeBSD: src/usr.bin/bsdiff/bspatch/bspatch.c,v 1.1 2005/08/06 01:59:06 cperciva Exp $");
+__FBSDID("$FreeBSD$");
+ #endif
+ 
+ #include <bzlib.h>
+-#include <stdlib.h>
+#include <err.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <limits.h>
+#include <stdint.h>
+ #include <stdio.h>
+#include <stdlib.h>
+ #include <string.h>
+-#include <err.h>
+ #include <unistd.h>
+-#include <fcntl.h>
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+#define HEADER_SIZE 32
+
+/* TYPE_MINIMUM and TYPE_MAXIMUM taken from coreutils */
+#ifndef TYPE_MINIMUM
+#define TYPE_MINIMUM(t) \
+  ((t) ((t) 0 < (t) -1 ? (t) 0 : ~ TYPE_MAXIMUM (t)))
+#endif
+#ifndef TYPE_MAXIMUM
+#define TYPE_MAXIMUM(t) \
+  ((t) ((t) 0 < (t) -1 \
+        ? (t) -1 \
+        : ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1)))
+#endif
+
+#ifndef OFF_MAX
+#define OFF_MAX TYPE_MAXIMUM(off_t)
+#endif
+
+#ifndef OFF_MIN
+#define OFF_MIN TYPE_MINIMUM(off_t)
+#endif
+
+static char *newfile;
+static int dirfd = -1;
+
+static void
+exit_cleanup(void)
+{
+
+	if (dirfd != -1 && newfile != NULL)
+		if (unlinkat(dirfd, newfile, 0))
+			warn("unlinkat");
+}
+
+static inline off_t
+add_off_t(off_t a, off_t b)
+{
+	off_t result;
+
+#if __GNUC__ >= 5 || \
+    (defined(__has_builtin) && __has_builtin(__builtin_add_overflow))
+	if (__builtin_add_overflow(a, b, &result))
+		errx(1, "Corrupt patch");
+#else
+	if ((b > 0 && a > OFF_MAX - b) || (b < 0 && a < OFF_MIN - b))
+		errx(1, "Corrupt patch");
+	result = a + b;
+#endif
+	return result;
+}
+ 
+ static off_t offtin(unsigned char *buf)
+ {
+ 	off_t y;
+ 
+-	y=buf[7]&0x7F;
+-	y=y*256;y+=buf[6];
+-	y=y*256;y+=buf[5];
+-	y=y*256;y+=buf[4];
+-	y=y*256;y+=buf[3];
+-	y=y*256;y+=buf[2];
+-	y=y*256;y+=buf[1];
+-	y=y*256;y+=buf[0];
+	y = buf[7] & 0x7F;
+	y = y * 256; y += buf[6];
+	y = y * 256; y += buf[5];
+	y = y * 256; y += buf[4];
+	y = y * 256; y += buf[3];
+	y = y * 256; y += buf[2];
+	y = y * 256; y += buf[1];
+	y = y * 256; y += buf[0];
+ 
+-	if(buf[7]&0x80) y=-y;
+	if (buf[7] & 0x80)
+		y = -y;
+ 
+-	return y;
+	return (y);
+ }
+ 
+-int main(int argc,char * argv[])
+static void
+usage(void)
+ {
+-	FILE * f, * cpf, * dpf, * epf;
+-	BZFILE * cpfbz2, * dpfbz2, * epfbz2;
+
+	fprintf(stderr, "usage: bspatch oldfile newfile patchfile\n");
+	exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+	FILE *f, *cpf, *dpf, *epf;
+	BZFILE *cpfbz2, *dpfbz2, *epfbz2;
+	char *directory, *namebuf;
+ 	int cbz2err, dbz2err, ebz2err;
+-	int fd;
+-	ssize_t oldsize,newsize;
+-	ssize_t bzctrllen,bzdatalen;
+-	unsigned char header[32],buf[8];
+	int newfd, oldfd;
+	off_t oldsize, newsize;
+	off_t bzctrllen, bzdatalen;
+	unsigned char header[HEADER_SIZE], buf[8];
+ 	unsigned char *old, *new;
+-	off_t oldpos,newpos;
+	off_t oldpos, newpos;
+ 	off_t ctrl[3];
+-	off_t lenread;
+-	off_t i;
+	off_t i, lenread, offset;
+ 
+-	if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]);
+	if (argc != 4)
+		usage();
+ 
+ 	/* Open patch file */
+-	if ((f = fopen(argv[3], "r")) == NULL)
+	if ((f = fopen(argv[3], "rb")) == NULL)
+		err(1, "fopen(%s)", argv[3]);
+	/* Open patch file for control block */
+	if ((cpf = fopen(argv[3], "rb")) == NULL)
+		err(1, "fopen(%s)", argv[3]);
+	/* open patch file for diff block */
+	if ((dpf = fopen(argv[3], "rb")) == NULL)
+ 		err(1, "fopen(%s)", argv[3]);
+	/* open patch file for extra block */
+	if ((epf = fopen(argv[3], "rb")) == NULL)
+		err(1, "fopen(%s)", argv[3]);
+	/* open oldfile */
+	if ((oldfd = open(argv[1], O_RDONLY | O_BINARY, 0)) < 0)
+		err(1, "open(%s)", argv[1]);
+	/* open directory where we'll write newfile */
+	if ((namebuf = strdup(argv[2])) == NULL ||
+	    (directory = dirname(namebuf)) == NULL ||
+	    (dirfd = open(directory, O_DIRECTORY)) < 0)
+		err(1, "open %s", argv[2]);
+	free(namebuf);
+	if ((newfile = basename(argv[2])) == NULL)
+		err(1, "basename");
+	/* open newfile */
+	if ((newfd = openat(dirfd, newfile,
+	    O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0666)) < 0)
+		err(1, "open(%s)", argv[2]);
+	atexit(exit_cleanup);
+ 
+ 	/*
+ 	File format:
+@@ -90,104 +184,104 @@ int main(int argc,char * argv[])
+ 	*/
+ 
+ 	/* Read header */
+-	if (fread(header, 1, 32, f) < 32) {
+	if (fread(header, 1, HEADER_SIZE, f) < HEADER_SIZE) {
+ 		if (feof(f))
+-			errx(1, "Corrupt patch\n");
+			errx(1, "Corrupt patch");
+ 		err(1, "fread(%s)", argv[3]);
+ 	}
+ 
+ 	/* Check for appropriate magic */
+ 	if (memcmp(header, "BSDIFF40", 8) != 0)
+-		errx(1, "Corrupt patch\n");
+		errx(1, "Corrupt patch");
+ 
+ 	/* Read lengths from header */
+-	bzctrllen=offtin(header+8);
+-	bzdatalen=offtin(header+16);
+-	newsize=offtin(header+24);
+-	if((bzctrllen<0) || (bzdatalen<0) || (newsize<0))
+-		errx(1,"Corrupt patch\n");
+	bzctrllen = offtin(header + 8);
+	bzdatalen = offtin(header + 16);
+	newsize = offtin(header + 24);
+	if (bzctrllen < 0 || bzctrllen > OFF_MAX - HEADER_SIZE ||
+	    bzdatalen < 0 || bzctrllen + HEADER_SIZE > OFF_MAX - bzdatalen ||
+	    newsize < 0 || newsize > SSIZE_MAX)
+		errx(1, "Corrupt patch");
+ 
+ 	/* Close patch file and re-open it via libbzip2 at the right places */
+ 	if (fclose(f))
+ 		err(1, "fclose(%s)", argv[3]);
+-	if ((cpf = fopen(argv[3], "r")) == NULL)
+-		err(1, "fopen(%s)", argv[3]);
+-	if (fseeko(cpf, 32, SEEK_SET))
+-		err(1, "fseeko(%s, %lld)", argv[3],
+-		    (long long)32);
+	offset = HEADER_SIZE;
+	if (fseeko(cpf, offset, SEEK_SET))
+		err(1, "fseeko(%s, %jd)", argv[3], (intmax_t)offset);
+ 	if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL)
+ 		errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err);
+-	if ((dpf = fopen(argv[3], "r")) == NULL)
+-		err(1, "fopen(%s)", argv[3]);
+-	if (fseeko(dpf, 32 + bzctrllen, SEEK_SET))
+-		err(1, "fseeko(%s, %lld)", argv[3],
+-		    (long long)(32 + bzctrllen));
+	offset = add_off_t(offset, bzctrllen);
+	if (fseeko(dpf, offset, SEEK_SET))
+		err(1, "fseeko(%s, %jd)", argv[3], (intmax_t)offset);
+ 	if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL)
+ 		errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err);
+-	if ((epf = fopen(argv[3], "r")) == NULL)
+-		err(1, "fopen(%s)", argv[3]);
+-	if (fseeko(epf, 32 + bzctrllen + bzdatalen, SEEK_SET))
+-		err(1, "fseeko(%s, %lld)", argv[3],
+-		    (long long)(32 + bzctrllen + bzdatalen));
+	offset = add_off_t(offset, bzdatalen);
+	if (fseeko(epf, offset, SEEK_SET))
+		err(1, "fseeko(%s, %jd)", argv[3], (intmax_t)offset);
+ 	if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL)
+ 		errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err);
+ 
+-	if(((fd=open(argv[1],O_RDONLY,0))<0) ||
+-		((oldsize=lseek(fd,0,SEEK_END))==-1) ||
+-		((old=malloc(oldsize+1))==NULL) ||
+-		(lseek(fd,0,SEEK_SET)!=0) ||
+-		(read(fd,old,oldsize)!=oldsize) ||
+-		(close(fd)==-1)) err(1,"%s",argv[1]);
+-	if((new=malloc(newsize+1))==NULL) err(1,NULL);
+-
+-	oldpos=0;newpos=0;
+-	while(newpos<newsize) {
+	if ((oldsize = lseek(oldfd, 0, SEEK_END)) == -1 ||
+	    oldsize > SSIZE_MAX ||
+	    (old = malloc(oldsize)) == NULL ||
+	    lseek(oldfd, 0, SEEK_SET) != 0 ||
+	    read(oldfd, old, oldsize) != oldsize ||
+	    close(oldfd) == -1)
+		err(1, "%s", argv[1]);
+	if ((new = malloc(newsize)) == NULL)
+		err(1, NULL);
+
+	oldpos = 0;
+	newpos = 0;
+	while (newpos < newsize) {
+ 		/* Read control data */
+-		for(i=0;i<=2;i++) {
+		for (i = 0; i <= 2; i++) {
+ 			lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8);
+ 			if ((lenread < 8) || ((cbz2err != BZ_OK) &&
+ 			    (cbz2err != BZ_STREAM_END)))
+-				errx(1, "Corrupt patch\n");
+-			ctrl[i]=offtin(buf);
+-		};
+				errx(1, "Corrupt patch");
+			ctrl[i] = offtin(buf);
+		}
+ 
+ 		/* Sanity-check */
+-		if ((ctrl[0] < 0) || (ctrl[1] < 0))
+-			errx(1,"Corrupt patch\n");
+		if (ctrl[0] < 0 || ctrl[0] > INT_MAX ||
+		    ctrl[1] < 0 || ctrl[1] > INT_MAX)
+			errx(1, "Corrupt patch");
+ 
+ 		/* Sanity-check */
+-		if(newpos+ctrl[0]>newsize)
+-			errx(1,"Corrupt patch\n");
+		if (add_off_t(newpos, ctrl[0]) > newsize)
+			errx(1, "Corrupt patch");
+ 
+ 		/* Read diff string */
+ 		lenread = BZ2_bzRead(&dbz2err, dpfbz2, new + newpos, ctrl[0]);
+ 		if ((lenread < ctrl[0]) ||
+ 		    ((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END)))
+-			errx(1, "Corrupt patch\n");
+			errx(1, "Corrupt patch");
+ 
+ 		/* Add old data to diff string */
+-		for(i=0;i<ctrl[0];i++)
+-			if((oldpos+i>=0) && (oldpos+i<oldsize))
+-				new[newpos+i]+=old[oldpos+i];
+		for (i = 0; i < ctrl[0]; i++)
+			if (add_off_t(oldpos, i) < oldsize)
+				new[newpos + i] += old[oldpos + i];
+ 
+ 		/* Adjust pointers */
+-		newpos+=ctrl[0];
+-		oldpos+=ctrl[0];
+		newpos = add_off_t(newpos, ctrl[0]);
+		oldpos = add_off_t(oldpos, ctrl[0]);
+ 
+ 		/* Sanity-check */
+-		if(newpos+ctrl[1]>newsize)
+-			errx(1,"Corrupt patch\n");
+		if (add_off_t(newpos, ctrl[1]) > newsize)
+			errx(1, "Corrupt patch");
+ 
+ 		/* Read extra string */
+ 		lenread = BZ2_bzRead(&ebz2err, epfbz2, new + newpos, ctrl[1]);
+ 		if ((lenread < ctrl[1]) ||
+ 		    ((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END)))
+-			errx(1, "Corrupt patch\n");
+			errx(1, "Corrupt patch");
+ 
+ 		/* Adjust pointers */
+-		newpos+=ctrl[1];
+-		oldpos+=ctrl[2];
+-	};
+		newpos = add_off_t(newpos, ctrl[1]);
+		oldpos = add_off_t(oldpos, ctrl[2]);
+	}
+ 
+ 	/* Clean up the bzip2 reads */
+ 	BZ2_bzReadClose(&cbz2err, cpfbz2);
+@@ -197,12 +291,13 @@ int main(int argc,char * argv[])
+ 		err(1, "fclose(%s)", argv[3]);
+ 
+ 	/* Write the new file */
+-	if(((fd=open(argv[2],O_CREAT|O_TRUNC|O_WRONLY,0666))<0) ||
+-		(write(fd,new,newsize)!=newsize) || (close(fd)==-1))
+-		err(1,"%s",argv[2]);
+	if (write(newfd, new, newsize) != newsize || close(newfd) == -1)
+		err(1, "%s", argv[2]);
+	/* Disable atexit cleanup */
+	newfile = NULL;
+ 
+ 	free(new);
+ 	free(old);
+ 
+-	return 0;
+	return (0);
+ }