svn commit: r267827 - in head/contrib/file: . Magdir
Xin LI
delphij at FreeBSD.org
Tue Jun 24 19:04:34 UTC 2014
Author: delphij
Date: Tue Jun 24 19:04:32 2014
New Revision: 267827
URL: http://svnweb.freebsd.org/changeset/base/267827
Log:
Fix multiple vulnerabilities in file(1) and libmagic(3).
Security: FreeBSD-SA-14:16.file
Approved by: so
Modified:
head/contrib/file/Magdir/commands
head/contrib/file/ascmagic.c
head/contrib/file/file.h
head/contrib/file/funcs.c
head/contrib/file/softmagic.c
Modified: head/contrib/file/Magdir/commands
==============================================================================
--- head/contrib/file/Magdir/commands Tue Jun 24 18:56:45 2014 (r267826)
+++ head/contrib/file/Magdir/commands Tue Jun 24 19:04:32 2014 (r267827)
@@ -49,7 +49,8 @@
!:mime text/x-awk
0 string/wt #!\ /usr/bin/awk awk script text executable
!:mime text/x-awk
-0 regex =^\\s*BEGIN\\s*[{] awk script text
+0 regex =^\\s{0,100}BEGIN\\s{0,100}[{] awk script text
+!:strength - 12
# AT&T Bell Labs' Plan 9 shell
0 string/wt #!\ /bin/rc Plan 9 rc shell script text executable
Modified: head/contrib/file/ascmagic.c
==============================================================================
--- head/contrib/file/ascmagic.c Tue Jun 24 18:56:45 2014 (r267826)
+++ head/contrib/file/ascmagic.c Tue Jun 24 19:04:32 2014 (r267827)
@@ -147,7 +147,7 @@ file_ascmagic_with_encoding(struct magic
== NULL)
goto done;
if ((rv = file_softmagic(ms, utf8_buf,
- (size_t)(utf8_end - utf8_buf), TEXTTEST, text)) == 0)
+ (size_t)(utf8_end - utf8_buf), 0, TEXTTEST, text)) == 0)
rv = -1;
}
Modified: head/contrib/file/file.h
==============================================================================
--- head/contrib/file/file.h Tue Jun 24 18:56:45 2014 (r267826)
+++ head/contrib/file/file.h Tue Jun 24 19:04:32 2014 (r267827)
@@ -414,7 +414,7 @@ protected int file_encoding(struct magic
unichar **, size_t *, const char **, const char **, const char **);
protected int file_is_tar(struct magic_set *, const unsigned char *, size_t);
protected int file_softmagic(struct magic_set *, const unsigned char *, size_t,
- int, int);
+ size_t, int, int);
protected struct mlist *file_apprentice(struct magic_set *, const char *, int);
protected uint64_t file_signextend(struct magic_set *, struct magic *,
uint64_t);
Modified: head/contrib/file/funcs.c
==============================================================================
--- head/contrib/file/funcs.c Tue Jun 24 18:56:45 2014 (r267826)
+++ head/contrib/file/funcs.c Tue Jun 24 19:04:32 2014 (r267827)
@@ -228,7 +228,7 @@ file_buffer(struct magic_set *ms, int fd
/* try soft magic tests */
if ((ms->flags & MAGIC_NO_CHECK_SOFT) == 0)
- if ((m = file_softmagic(ms, ubuf, nb, BINTEST,
+ if ((m = file_softmagic(ms, ubuf, nb, 0, BINTEST,
looks_text)) != 0) {
if ((ms->flags & MAGIC_DEBUG) != 0)
(void)fprintf(stderr, "softmagic %d\n", m);
Modified: head/contrib/file/softmagic.c
==============================================================================
--- head/contrib/file/softmagic.c Tue Jun 24 18:56:45 2014 (r267826)
+++ head/contrib/file/softmagic.c Tue Jun 24 19:04:32 2014 (r267827)
@@ -43,9 +43,9 @@ FILE_RCSID("@(#)$File: softmagic.c,v 1.1
private int match(struct magic_set *, struct magic *, uint32_t,
- const unsigned char *, size_t, int, int);
+ const unsigned char *, size_t, int, int, int);
private int mget(struct magic_set *, const unsigned char *,
- struct magic *, size_t, unsigned int, int);
+ struct magic *, size_t, unsigned int, int, int);
private int magiccheck(struct magic_set *, struct magic *);
private int32_t mprint(struct magic_set *, struct magic *);
private int32_t moffset(struct magic_set *, struct magic *);
@@ -60,6 +60,7 @@ private void cvt_16(union VALUETYPE *, c
private void cvt_32(union VALUETYPE *, const struct magic *);
private void cvt_64(union VALUETYPE *, const struct magic *);
+#define OFFSET_OOB(n, o, i) ((n) < (o) || (i) > ((n) - (o)))
/*
* softmagic - lookup one file in parsed, in-memory copy of database
* Passed the name and FILE * of one file to be typed.
@@ -67,13 +68,13 @@ private void cvt_64(union VALUETYPE *, c
/*ARGSUSED1*/ /* nbytes passed for regularity, maybe need later */
protected int
file_softmagic(struct magic_set *ms, const unsigned char *buf, size_t nbytes,
- int mode, int text)
+ size_t level, int mode, int text)
{
struct mlist *ml;
int rv;
for (ml = ms->mlist->next; ml != ms->mlist; ml = ml->next)
if ((rv = match(ms, ml->magic, ml->nmagic, buf, nbytes, mode,
- text)) != 0)
+ text, level)) != 0)
return rv;
return 0;
@@ -108,7 +109,8 @@ file_softmagic(struct magic_set *ms, con
*/
private int
match(struct magic_set *ms, struct magic *magic, uint32_t nmagic,
- const unsigned char *s, size_t nbytes, int mode, int text)
+ const unsigned char *s, size_t nbytes, int mode, int text,
+ int recursion_level)
{
uint32_t magindex = 0;
unsigned int cont_level = 0;
@@ -140,7 +142,7 @@ match(struct magic_set *ms, struct magic
ms->line = m->lineno;
/* if main entry matches, print it... */
- switch (mget(ms, s, m, nbytes, cont_level, text)) {
+ switch (mget(ms, s, m, nbytes, cont_level, text, recursion_level + 1)) {
case -1:
return -1;
case 0:
@@ -223,7 +225,7 @@ match(struct magic_set *ms, struct magic
continue;
}
#endif
- switch (mget(ms, s, m, nbytes, cont_level, text)) {
+ switch (mget(ms, s, m, nbytes, cont_level, text, recursion_level + 1)) {
case -1:
return -1;
case 0:
@@ -1018,12 +1020,18 @@ mcopy(struct magic_set *ms, union VALUET
private int
mget(struct magic_set *ms, const unsigned char *s,
- struct magic *m, size_t nbytes, unsigned int cont_level, int text)
+ struct magic *m, size_t nbytes, unsigned int cont_level, int text,
+ int recursion_level)
{
uint32_t offset = ms->offset;
uint32_t count = m->str_range;
union VALUETYPE *p = &ms->ms_value;
+ if (recursion_level >= 20) {
+ file_error(ms, 0, "recursion nesting exceeded");
+ return -1;
+ }
+
if (mcopy(ms, p, m->type, m->flag & INDIR, s, offset, nbytes, count) == -1)
return -1;
@@ -1073,7 +1081,7 @@ mget(struct magic_set *ms, const unsigne
}
switch (m->in_type) {
case FILE_BYTE:
- if (nbytes < (offset + 1))
+ if (OFFSET_OOB(nbytes, offset, 1))
return 0;
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
@@ -1108,7 +1116,7 @@ mget(struct magic_set *ms, const unsigne
offset = ~offset;
break;
case FILE_BESHORT:
- if (nbytes < (offset + 2))
+ if (OFFSET_OOB(nbytes, offset, 2))
return 0;
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
@@ -1160,7 +1168,7 @@ mget(struct magic_set *ms, const unsigne
offset = ~offset;
break;
case FILE_LESHORT:
- if (nbytes < (offset + 2))
+ if (OFFSET_OOB(nbytes, offset, 2))
return 0;
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
@@ -1212,7 +1220,7 @@ mget(struct magic_set *ms, const unsigne
offset = ~offset;
break;
case FILE_SHORT:
- if (nbytes < (offset + 2))
+ if (OFFSET_OOB(nbytes, offset, 2))
return 0;
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
@@ -1249,7 +1257,7 @@ mget(struct magic_set *ms, const unsigne
break;
case FILE_BELONG:
case FILE_BEID3:
- if (nbytes < (offset + 4))
+ if (OFFSET_OOB(nbytes, offset, 4))
return 0;
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
@@ -1320,7 +1328,7 @@ mget(struct magic_set *ms, const unsigne
break;
case FILE_LELONG:
case FILE_LEID3:
- if (nbytes < (offset + 4))
+ if (OFFSET_OOB(nbytes, offset, 4))
return 0;
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
@@ -1390,7 +1398,7 @@ mget(struct magic_set *ms, const unsigne
offset = ~offset;
break;
case FILE_MELONG:
- if (nbytes < (offset + 4))
+ if (OFFSET_OOB(nbytes, offset, 4))
return 0;
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
@@ -1460,7 +1468,7 @@ mget(struct magic_set *ms, const unsigne
offset = ~offset;
break;
case FILE_LONG:
- if (nbytes < (offset + 4))
+ if (OFFSET_OOB(nbytes, offset, 4))
return 0;
if (off) {
switch (m->in_op & FILE_OPS_MASK) {
@@ -1527,14 +1535,14 @@ mget(struct magic_set *ms, const unsigne
/* Verify we have enough data to match magic type */
switch (m->type) {
case FILE_BYTE:
- if (nbytes < (offset + 1)) /* should alway be true */
+ if (OFFSET_OOB(nbytes, offset, 1))
return 0;
break;
case FILE_SHORT:
case FILE_BESHORT:
case FILE_LESHORT:
- if (nbytes < (offset + 2))
+ if (OFFSET_OOB(nbytes, offset, 2))
return 0;
break;
@@ -1553,21 +1561,21 @@ mget(struct magic_set *ms, const unsigne
case FILE_FLOAT:
case FILE_BEFLOAT:
case FILE_LEFLOAT:
- if (nbytes < (offset + 4))
+ if (OFFSET_OOB(nbytes, offset, 4))
return 0;
break;
case FILE_DOUBLE:
case FILE_BEDOUBLE:
case FILE_LEDOUBLE:
- if (nbytes < (offset + 8))
+ if (OFFSET_OOB(nbytes, offset, 8))
return 0;
break;
case FILE_STRING:
case FILE_PSTRING:
case FILE_SEARCH:
- if (nbytes < (offset + m->vallen))
+ if (OFFSET_OOB(nbytes, offset, m->vallen))
return 0;
break;
@@ -1577,13 +1585,15 @@ mget(struct magic_set *ms, const unsigne
break;
case FILE_INDIRECT:
+ if (offset == 0)
+ return 0;
if ((ms->flags & (MAGIC_MIME|MAGIC_APPLE)) == 0 &&
file_printf(ms, "%s", m->desc) == -1)
return -1;
if (nbytes < offset)
return 0;
return file_softmagic(ms, s + offset, nbytes - offset,
- BINTEST, text);
+ recursion_level, BINTEST, text);
case FILE_DEFAULT: /* nothing to check */
default:
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