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Fix multiple vulnerabilities in file(1) and libmagic(3).

Browse Source 
Security:	FreeBSD-SA-14:16.file
Approved by:	so
This commit is contained in:
Xin LI 2014-06-24 19:04:32 +00:00
parent 38b72f8cdf
commit d627d450b3
5 changed files with 37 additions and 26 deletions
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3
contrib/file/Magdir/commands
View File

@ -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

2
contrib/file/ascmagic.c
View File

@ -147,7 +147,7 @@ file_ascmagic_with_encoding(struct magic_set *ms, const unsigned char *buf,
== 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;
}

2
contrib/file/file.h
View File

@ -414,7 +414,7 @@ protected int file_encoding(struct magic_set *, const unsigned char *, size_t,
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);

2
contrib/file/funcs.c
View File

@ -228,7 +228,7 @@ file_buffer(struct magic_set *ms, int fd, const char *inname __attribute__ ((unu
/* 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);

54
contrib/file/softmagic.c
View File

@ -43,9 +43,9 @@ FILE_RCSID("@(#)$File: softmagic.c,v 1.147 2011/11/05 15:44:22 rrt Exp $")
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 *, const struct magic *);
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 *, const struct magic *);
/*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, const unsigned char *buf, size_t nbytes,
*/
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 *magic, uint32_t nmagic,
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 *magic, uint32_t nmagic,
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 VALUETYPE *p, int type, int indir,
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 unsigned char *s,
}
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 unsigned char *s,
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 unsigned char *s,
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 unsigned char *s,
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 unsigned char *s,
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 unsigned char *s,
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 unsigned char *s,
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 unsigned char *s,
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 unsigned char *s,
/* 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 unsigned char *s,
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 unsigned char *s,
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: