u-boot/lib/lzo/lzo1x_decompress.c
Kees Cook ff9d2efdbf lzo: correctly bounds-check output buffer
This checks the size of the output buffer and fails if it was going to
overflow the buffer during lzo decompression.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
2013-09-03 13:30:23 -06:00

337 lines
6.6 KiB
C

/*
* LZO1X Decompressor from MiniLZO
*
* Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <markus@oberhumer.com>
*
* The full LZO package can be found at:
* http://www.oberhumer.com/opensource/lzo/
*
* Changed for kernel use by:
* Nitin Gupta <nitingupta910@gmail.com>
* Richard Purdie <rpurdie@openedhand.com>
*/
#include <common.h>
#include <linux/lzo.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include "lzodefs.h"
#define HAVE_IP(x, ip_end, ip) ((size_t)(ip_end - ip) < (x))
#define HAVE_OP(x, op_end, op) ((size_t)(op_end - op) < (x))
#define HAVE_LB(m_pos, out, op) (m_pos < out || m_pos >= op)
#define COPY4(dst, src) \
put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
static const unsigned char lzop_magic[] = {
0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a
};
#define HEADER_HAS_FILTER 0x00000800L
static inline const unsigned char *parse_header(const unsigned char *src)
{
u16 version;
int i;
/* read magic: 9 first bytes */
for (i = 0; i < ARRAY_SIZE(lzop_magic); i++) {
if (*src++ != lzop_magic[i])
return NULL;
}
/* get version (2bytes), skip library version (2),
* 'need to be extracted' version (2) and
* method (1) */
version = get_unaligned_be16(src);
src += 7;
if (version >= 0x0940)
src++;
if (get_unaligned_be32(src) & HEADER_HAS_FILTER)
src += 4; /* filter info */
/* skip flags, mode and mtime_low */
src += 12;
if (version >= 0x0940)
src += 4; /* skip mtime_high */
i = *src++;
/* don't care about the file name, and skip checksum */
src += i + 4;
return src;
}
int lzop_decompress(const unsigned char *src, size_t src_len,
unsigned char *dst, size_t *dst_len)
{
unsigned char *start = dst;
const unsigned char *send = src + src_len;
u32 slen, dlen;
size_t tmp, remaining;
int r;
src = parse_header(src);
if (!src)
return LZO_E_ERROR;
remaining = *dst_len;
while (src < send) {
/* read uncompressed block size */
dlen = get_unaligned_be32(src);
src += 4;
/* exit if last block */
if (dlen == 0) {
*dst_len = dst - start;
return LZO_E_OK;
}
/* read compressed block size, and skip block checksum info */
slen = get_unaligned_be32(src);
src += 8;
if (slen <= 0 || slen > dlen)
return LZO_E_ERROR;
/* abort if buffer ran out of room */
if (dlen > remaining)
return LZO_E_OUTPUT_OVERRUN;
/* decompress */
tmp = dlen;
r = lzo1x_decompress_safe((u8 *) src, slen, dst, &tmp);
if (r != LZO_E_OK)
return r;
if (dlen != tmp)
return LZO_E_ERROR;
src += slen;
dst += dlen;
remaining -= dlen;
}
return LZO_E_INPUT_OVERRUN;
}
int lzo1x_decompress_safe(const unsigned char *in, size_t in_len,
unsigned char *out, size_t *out_len)
{
const unsigned char * const ip_end = in + in_len;
unsigned char * const op_end = out + *out_len;
const unsigned char *ip = in, *m_pos;
unsigned char *op = out;
size_t t;
*out_len = 0;
if (*ip > 17) {
t = *ip++ - 17;
if (t < 4)
goto match_next;
if (HAVE_OP(t, op_end, op))
goto output_overrun;
if (HAVE_IP(t + 1, ip_end, ip))
goto input_overrun;
do {
*op++ = *ip++;
} while (--t > 0);
goto first_literal_run;
}
while ((ip < ip_end)) {
t = *ip++;
if (t >= 16)
goto match;
if (t == 0) {
if (HAVE_IP(1, ip_end, ip))
goto input_overrun;
while (*ip == 0) {
t += 255;
ip++;
if (HAVE_IP(1, ip_end, ip))
goto input_overrun;
}
t += 15 + *ip++;
}
if (HAVE_OP(t + 3, op_end, op))
goto output_overrun;
if (HAVE_IP(t + 4, ip_end, ip))
goto input_overrun;
COPY4(op, ip);
op += 4;
ip += 4;
if (--t > 0) {
if (t >= 4) {
do {
COPY4(op, ip);
op += 4;
ip += 4;
t -= 4;
} while (t >= 4);
if (t > 0) {
do {
*op++ = *ip++;
} while (--t > 0);
}
} else {
do {
*op++ = *ip++;
} while (--t > 0);
}
}
first_literal_run:
t = *ip++;
if (t >= 16)
goto match;
m_pos = op - (1 + M2_MAX_OFFSET);
m_pos -= t >> 2;
m_pos -= *ip++ << 2;
if (HAVE_LB(m_pos, out, op))
goto lookbehind_overrun;
if (HAVE_OP(3, op_end, op))
goto output_overrun;
*op++ = *m_pos++;
*op++ = *m_pos++;
*op++ = *m_pos;
goto match_done;
do {
match:
if (t >= 64) {
m_pos = op - 1;
m_pos -= (t >> 2) & 7;
m_pos -= *ip++ << 3;
t = (t >> 5) - 1;
if (HAVE_LB(m_pos, out, op))
goto lookbehind_overrun;
if (HAVE_OP(t + 3 - 1, op_end, op))
goto output_overrun;
goto copy_match;
} else if (t >= 32) {
t &= 31;
if (t == 0) {
if (HAVE_IP(1, ip_end, ip))
goto input_overrun;
while (*ip == 0) {
t += 255;
ip++;
if (HAVE_IP(1, ip_end, ip))
goto input_overrun;
}
t += 31 + *ip++;
}
m_pos = op - 1;
m_pos -= get_unaligned_le16(ip) >> 2;
ip += 2;
} else if (t >= 16) {
m_pos = op;
m_pos -= (t & 8) << 11;
t &= 7;
if (t == 0) {
if (HAVE_IP(1, ip_end, ip))
goto input_overrun;
while (*ip == 0) {
t += 255;
ip++;
if (HAVE_IP(1, ip_end, ip))
goto input_overrun;
}
t += 7 + *ip++;
}
m_pos -= get_unaligned_le16(ip) >> 2;
ip += 2;
if (m_pos == op)
goto eof_found;
m_pos -= 0x4000;
} else {
m_pos = op - 1;
m_pos -= t >> 2;
m_pos -= *ip++ << 2;
if (HAVE_LB(m_pos, out, op))
goto lookbehind_overrun;
if (HAVE_OP(2, op_end, op))
goto output_overrun;
*op++ = *m_pos++;
*op++ = *m_pos;
goto match_done;
}
if (HAVE_LB(m_pos, out, op))
goto lookbehind_overrun;
if (HAVE_OP(t + 3 - 1, op_end, op))
goto output_overrun;
if (t >= 2 * 4 - (3 - 1) && (op - m_pos) >= 4) {
COPY4(op, m_pos);
op += 4;
m_pos += 4;
t -= 4 - (3 - 1);
do {
COPY4(op, m_pos);
op += 4;
m_pos += 4;
t -= 4;
} while (t >= 4);
if (t > 0)
do {
*op++ = *m_pos++;
} while (--t > 0);
} else {
copy_match:
*op++ = *m_pos++;
*op++ = *m_pos++;
do {
*op++ = *m_pos++;
} while (--t > 0);
}
match_done:
t = ip[-2] & 3;
if (t == 0)
break;
match_next:
if (HAVE_OP(t, op_end, op))
goto output_overrun;
if (HAVE_IP(t + 1, ip_end, ip))
goto input_overrun;
*op++ = *ip++;
if (t > 1) {
*op++ = *ip++;
if (t > 2)
*op++ = *ip++;
}
t = *ip++;
} while (ip < ip_end);
}
*out_len = op - out;
return LZO_E_EOF_NOT_FOUND;
eof_found:
*out_len = op - out;
return (ip == ip_end ? LZO_E_OK :
(ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
input_overrun:
*out_len = op - out;
return LZO_E_INPUT_OVERRUN;
output_overrun:
*out_len = op - out;
return LZO_E_OUTPUT_OVERRUN;
lookbehind_overrun:
*out_len = op - out;
return LZO_E_LOOKBEHIND_OVERRUN;
}