mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 22:47:56 +00:00
cac723e8b8
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>
384 lines
11 KiB
Diff
384 lines
11 KiB
Diff
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);
|
||
}
|