svn commit: r275666 - head/contrib/file/src
Xin LI
delphij at FreeBSD.org
Wed Dec 10 08:19:57 UTC 2014
Author: delphij
Date: Wed Dec 10 08:19:55 2014
New Revision: 275666
URL: https://svnweb.freebsd.org/changeset/base/275666
Log:
Fix multiple vulnerabilities in file(1) and libmagic(3).
Security: FreeBSD-SA-14:28.file
Security: CVE-2014-3710, CVE-2014-8116, CVE-2014-8117
Modified:
head/contrib/file/src/elfclass.h
head/contrib/file/src/file.h
head/contrib/file/src/funcs.c
head/contrib/file/src/readelf.c
head/contrib/file/src/softmagic.c
Modified: head/contrib/file/src/elfclass.h
==============================================================================
--- head/contrib/file/src/elfclass.h Wed Dec 10 08:18:22 2014 (r275665)
+++ head/contrib/file/src/elfclass.h Wed Dec 10 08:19:55 2014 (r275666)
@@ -35,10 +35,12 @@
switch (type) {
#ifdef ELFCORE
case ET_CORE:
+ phnum = elf_getu16(swap, elfhdr.e_phnum);
+ if (phnum > MAX_PHNUM)
+ return toomany(ms, "program", phnum);
flags |= FLAGS_IS_CORE;
if (dophn_core(ms, clazz, swap, fd,
- (off_t)elf_getu(swap, elfhdr.e_phoff),
- elf_getu16(swap, elfhdr.e_phnum),
+ (off_t)elf_getu(swap, elfhdr.e_phoff), phnum,
(size_t)elf_getu16(swap, elfhdr.e_phentsize),
fsize, &flags) == -1)
return -1;
@@ -46,18 +48,24 @@
#endif
case ET_EXEC:
case ET_DYN:
+ phnum = elf_getu16(swap, elfhdr.e_phnum);
+ if (phnum > MAX_PHNUM)
+ return toomany(ms, "program", phnum);
+ shnum = elf_getu16(swap, elfhdr.e_shnum);
+ if (shnum > MAX_SHNUM)
+ return toomany(ms, "section", shnum);
if (dophn_exec(ms, clazz, swap, fd,
- (off_t)elf_getu(swap, elfhdr.e_phoff),
- elf_getu16(swap, elfhdr.e_phnum),
+ (off_t)elf_getu(swap, elfhdr.e_phoff), phnum,
(size_t)elf_getu16(swap, elfhdr.e_phentsize),
- fsize, &flags, elf_getu16(swap, elfhdr.e_shnum))
- == -1)
+ fsize, &flags, shnum) == -1)
return -1;
/*FALLTHROUGH*/
case ET_REL:
+ shnum = elf_getu16(swap, elfhdr.e_shnum);
+ if (shnum > MAX_SHNUM)
+ return toomany(ms, "section", shnum);
if (doshn(ms, clazz, swap, fd,
- (off_t)elf_getu(swap, elfhdr.e_shoff),
- elf_getu16(swap, elfhdr.e_shnum),
+ (off_t)elf_getu(swap, elfhdr.e_shoff), shnum,
(size_t)elf_getu16(swap, elfhdr.e_shentsize),
fsize, &flags, elf_getu16(swap, elfhdr.e_machine),
(int)elf_getu16(swap, elfhdr.e_shstrndx)) == -1)
Modified: head/contrib/file/src/file.h
==============================================================================
--- head/contrib/file/src/file.h Wed Dec 10 08:18:22 2014 (r275665)
+++ head/contrib/file/src/file.h Wed Dec 10 08:19:55 2014 (r275666)
@@ -482,6 +482,14 @@ protected int file_regexec(file_regex_t
protected void file_regfree(file_regex_t *);
protected void file_regerror(file_regex_t *, int, struct magic_set *);
+typedef struct {
+ char *buf;
+ uint32_t offset;
+} file_pushbuf_t;
+
+protected file_pushbuf_t *file_push_buffer(struct magic_set *);
+protected char *file_pop_buffer(struct magic_set *, file_pushbuf_t *);
+
#ifndef COMPILE_ONLY
extern const char *file_names[];
extern const size_t file_nnames;
Modified: head/contrib/file/src/funcs.c
==============================================================================
--- head/contrib/file/src/funcs.c Wed Dec 10 08:18:22 2014 (r275665)
+++ head/contrib/file/src/funcs.c Wed Dec 10 08:19:55 2014 (r275666)
@@ -491,3 +491,43 @@ file_regerror(file_regex_t *rx, int rc,
file_magerror(ms, "regex error %d for `%s', (%s)", rc, rx->pat,
errmsg);
}
+
+protected file_pushbuf_t *
+file_push_buffer(struct magic_set *ms)
+{
+ file_pushbuf_t *pb;
+
+ if (ms->event_flags & EVENT_HAD_ERR)
+ return NULL;
+
+ if ((pb = (CAST(file_pushbuf_t *, malloc(sizeof(*pb))))) == NULL)
+ return NULL;
+
+ pb->buf = ms->o.buf;
+ pb->offset = ms->offset;
+
+ ms->o.buf = NULL;
+ ms->offset = 0;
+
+ return pb;
+}
+
+protected char *
+file_pop_buffer(struct magic_set *ms, file_pushbuf_t *pb)
+{
+ char *rbuf;
+
+ if (ms->event_flags & EVENT_HAD_ERR) {
+ free(pb->buf);
+ free(pb);
+ return NULL;
+ }
+
+ rbuf = ms->o.buf;
+
+ ms->o.buf = pb->buf;
+ ms->offset = pb->offset;
+
+ free(pb);
+ return rbuf;
+}
Modified: head/contrib/file/src/readelf.c
==============================================================================
--- head/contrib/file/src/readelf.c Wed Dec 10 08:18:22 2014 (r275665)
+++ head/contrib/file/src/readelf.c Wed Dec 10 08:19:55 2014 (r275666)
@@ -60,6 +60,18 @@ private uint16_t getu16(int, uint16_t);
private uint32_t getu32(int, uint32_t);
private uint64_t getu64(int, uint64_t);
+#define MAX_PHNUM 256
+#define MAX_SHNUM 1024
+
+private int
+toomany(struct magic_set *ms, const char *name, uint16_t num)
+{
+ if (file_printf(ms, ", too many %s header sections (%u)", name, num
+ ) == -1)
+ return -1;
+ return 0;
+}
+
private uint16_t
getu16(int swap, uint16_t value)
{
@@ -477,6 +489,13 @@ donote(struct magic_set *ms, void *vbuf,
uint32_t namesz, descsz;
unsigned char *nbuf = CAST(unsigned char *, vbuf);
+ if (xnh_sizeof + offset > size) {
+ /*
+ * We're out of note headers.
+ */
+ return xnh_sizeof + offset;
+ }
+
(void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
offset += xnh_sizeof;
@@ -492,13 +511,13 @@ donote(struct magic_set *ms, void *vbuf,
if (namesz & 0x80000000) {
(void)file_printf(ms, ", bad note name size 0x%lx",
(unsigned long)namesz);
- return offset;
+ return 0;
}
if (descsz & 0x80000000) {
(void)file_printf(ms, ", bad note description size 0x%lx",
(unsigned long)descsz);
- return offset;
+ return 0;
}
@@ -900,6 +919,7 @@ doshn(struct magic_set *ms, int clazz, i
Elf32_Shdr sh32;
Elf64_Shdr sh64;
int stripped = 1;
+ size_t nbadcap = 0;
void *nbuf;
off_t noff, coff, name_off;
uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */
@@ -988,6 +1008,8 @@ doshn(struct magic_set *ms, int clazz, i
goto skip;
}
+ if (nbadcap > 5)
+ break;
if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) {
file_badseek(ms);
return -1;
@@ -1053,6 +1075,8 @@ doshn(struct magic_set *ms, int clazz, i
(unsigned long long)xcap_tag,
(unsigned long long)xcap_val) == -1)
return -1;
+ if (nbadcap++ > 2)
+ coff = xsh_size;
break;
}
}
@@ -1233,7 +1257,7 @@ file_tryelf(struct magic_set *ms, int fd
int flags = 0;
Elf32_Ehdr elf32hdr;
Elf64_Ehdr elf64hdr;
- uint16_t type;
+ uint16_t type, phnum, shnum;
if (ms->flags & (MAGIC_MIME|MAGIC_APPLE))
return 0;
Modified: head/contrib/file/src/softmagic.c
==============================================================================
--- head/contrib/file/src/softmagic.c Wed Dec 10 08:18:22 2014 (r275665)
+++ head/contrib/file/src/softmagic.c Wed Dec 10 08:19:55 2014 (r275666)
@@ -67,6 +67,9 @@ private void cvt_32(union VALUETYPE *, c
private void cvt_64(union VALUETYPE *, const struct magic *);
#define OFFSET_OOB(n, o, i) ((n) < (o) || (i) > ((n) - (o)))
+
+#define MAX_RECURSION_LEVEL 10
+
/*
* softmagic - lookup one file in parsed, in-memory copy of database
* Passed the name and FILE * of one file to be typed.
@@ -1193,14 +1196,15 @@ mget(struct magic_set *ms, const unsigne
int flip, int recursion_level, int *printed_something,
int *need_separator, int *returnval)
{
- uint32_t soffset, offset = ms->offset;
+ uint32_t offset = ms->offset;
uint32_t lhs;
+ file_pushbuf_t *pb;
int rv, oneed_separator, in_type;
- char *sbuf, *rbuf;
+ char *rbuf;
union VALUETYPE *p = &ms->ms_value;
struct mlist ml;
- if (recursion_level >= 20) {
+ if (recursion_level >= MAX_RECURSION_LEVEL) {
file_error(ms, 0, "recursion nesting exceeded");
return -1;
}
@@ -1644,19 +1648,23 @@ mget(struct magic_set *ms, const unsigne
case FILE_INDIRECT:
if (offset == 0)
return 0;
+
if (nbytes < offset)
return 0;
- sbuf = ms->o.buf;
- soffset = ms->offset;
- ms->o.buf = NULL;
- ms->offset = 0;
+
+ if ((pb = file_push_buffer(ms)) == NULL)
+ return -1;
+
rv = file_softmagic(ms, s + offset, nbytes - offset,
recursion_level, BINTEST, text);
+
if ((ms->flags & MAGIC_DEBUG) != 0)
fprintf(stderr, "indirect @offs=%u[%d]\n", offset, rv);
- rbuf = ms->o.buf;
- ms->o.buf = sbuf;
- ms->offset = soffset;
+
+ rbuf = file_pop_buffer(ms, pb);
+ if (rbuf == NULL && ms->event_flags & EVENT_HAD_ERR)
+ return -1;
+
if (rv == 1) {
if ((ms->flags & (MAGIC_MIME|MAGIC_APPLE)) == 0 &&
file_printf(ms, F(ms, m, "%u"), offset) == -1) {
@@ -1674,13 +1682,13 @@ mget(struct magic_set *ms, const unsigne
case FILE_USE:
if (nbytes < offset)
return 0;
- sbuf = m->value.s;
- if (*sbuf == '^') {
- sbuf++;
+ rbuf = m->value.s;
+ if (*rbuf == '^') {
+ rbuf++;
flip = !flip;
}
- if (file_magicfind(ms, sbuf, &ml) == -1) {
- file_error(ms, 0, "cannot find entry `%s'", sbuf);
+ if (file_magicfind(ms, rbuf, &ml) == -1) {
+ file_error(ms, 0, "cannot find entry `%s'", rbuf);
return -1;
}
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