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igzip: Implement limited window size for inflate

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Change-Id: Ib7fce6a51db99fc7e11f06f5916c2b755bfc5c67
Signed-off-by: Roy Oursler <roy.j.oursler@intel.com>
This commit is contained in:
Roy Oursler 2018-06-11 15:55:17 -07:00
parent 03bef684a4
commit 11542000f0
5 changed files with 72 additions and 24 deletions
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11
igzip/igzip_decode_block_stateless.asm
View File

@ -405,7 +405,7 @@ stack_size equ 4 * 8 + 8 * 8
mov rcx, %%next_sym
shr rcx, SMALL_SHORT_CODE_LEN_OFFSET
jz invalid_symbol
jz invalid_dist_symbol_ %+ %%next_sym
;; Check if symbol or hint was looked up
and %%next_sym, SMALL_FLAG_BIT | SMALL_SHORT_SYM_MASK
@ -427,7 +427,7 @@ stack_size equ 4 * 8 + 8 * 8
;; Save length associated with symbol
mov rcx, %%next_sym
shr rcx, SMALL_LONG_CODE_LEN_OFFSET
jz invalid_symbol
jz invalid_dist_symbol_ %+ %%next_sym
and %%next_sym, SMALL_SHORT_SYM_MASK
%%end:
@ -741,6 +741,13 @@ invalid_look_back_distance:
mov rax, INVALID_LOOKBACK
jmp end
invalid_dist_symbol_ %+ next_sym:
cmp read_in_length, next_sym
jl end_of_input
jmp invalid_symbol
invalid_dist_symbol_ %+ next_sym3:
cmp read_in_length, next_sym3
jl end_of_input
invalid_symbol:
mov rax, INVALID_SYMBOL
jmp end

72
igzip/igzip_inflate.c
View File

@ -662,6 +662,7 @@ static void inline make_inflate_huff_code_dist(struct inflate_huff_code_small *r
uint32_t last_length;
uint32_t copy_size;
uint16_t *short_code_lookup = result->short_code_lookup;
uint32_t sym;
count_total[0] = 0;
count_total[1] = 0;
@ -701,8 +702,14 @@ static void inline make_inflate_huff_code_dist(struct inflate_huff_code_small *r
for (k = count_total[last_length]; k < count_total[last_length + 1]; k++) {
i = code_list[k];
if (i >= max_symbol)
if (i >= max_symbol) {
/* If the symbol is invalid, set code to be the
* length of the symbol and the code_length to 0
* to determine if there was enough input */
short_code_lookup[huff_code_table[i].code] =
huff_code_table[i].length;
continue;
}
/* Set lookup table to return the current symbol concatenated
* with the code length when the first DECODE_LENGTH bits of the
@ -746,19 +753,27 @@ static void inline make_inflate_huff_code_dist(struct inflate_huff_code_small *r
2 * (1 << (max_length - ISAL_DECODE_SHORT_BITS)));
for (j = 0; j < temp_code_length; j++) {
code_length = huff_code_table[temp_code_list[j]].length;
long_bits =
huff_code_table[temp_code_list[j]].code >> ISAL_DECODE_SHORT_BITS;
sym = temp_code_list[j];
code_length = huff_code_table[sym].length;
long_bits = huff_code_table[sym].code >> ISAL_DECODE_SHORT_BITS;
min_increment = 1 << (code_length - ISAL_DECODE_SHORT_BITS);
for (; long_bits < (1 << (max_length - ISAL_DECODE_SHORT_BITS));
long_bits += min_increment) {
if (sym >= max_symbol) {
/* If the symbol is invalid, set code to be the
* length of the symbol and the code_length to 0
* to determine if there was enough input */
result->long_code_lookup[long_code_lookup_length +
long_bits] = code_length;
continue;
}
result->long_code_lookup[long_code_lookup_length + long_bits] =
temp_code_list[j] |
rfc_lookup_table.dist_extra_bit_count[temp_code_list[j]] <<
sym |
rfc_lookup_table.dist_extra_bit_count[sym] <<
DIST_SYM_EXTRA_OFFSET |
(code_length << SMALL_LONG_CODE_LEN_OFFSET);
}
huff_code_table[temp_code_list[j]].code = 0xFFFF;
huff_code_table[sym].code = 0xFFFF;
}
result->short_code_lookup[first_bits] = long_code_lookup_length |
(max_length << SMALL_SHORT_CODE_LEN_OFFSET) | SMALL_FLAG_BIT;
@ -905,7 +920,7 @@ static int inline setup_static_header(struct inflate_state *state)
int i;
struct huff_code lit_code[LIT_LEN_ELEMS];
struct huff_code dist_code[DIST_LEN + 2];
uint32_t multisym = SINGLE_SYM_FLAG;
uint32_t multisym = SINGLE_SYM_FLAG, max_dist = DIST_LEN;
/* These tables are based on the static huffman tree described in RFC
* 1951 */
uint16_t lit_count[MAX_LIT_LEN_COUNT] = {
@ -943,8 +958,12 @@ static int inline setup_static_header(struct inflate_state *state)
make_inflate_huff_code_lit_len(&state->lit_huff_code, lit_code, LIT_LEN_ELEMS,
lit_count, code_list, multisym);
if (state->hist_bits && state->hist_bits < 15)
max_dist = 2 * state->hist_bits;
make_inflate_huff_code_dist(&state->dist_huff_code, dist_code, DIST_LEN + 2,
dist_count, DIST_LEN);
dist_count, max_dist);
state->block_state = ISAL_BLOCK_CODED;
@ -1037,8 +1056,10 @@ static uint16_t inline decode_next_dist(struct inflate_state *state,
state->read_in >>= bit_count;
state->read_in_length -= bit_count;
if (bit_count == 0)
if (bit_count == 0) {
state->read_in_length -= next_sym;
next_sym = INVALID_SYMBOL;
}
return next_sym & DIST_SYM_MASK;
@ -1054,8 +1075,13 @@ static uint16_t inline decode_next_dist(struct inflate_state *state,
bit_count = next_sym >> SMALL_LONG_CODE_LEN_OFFSET;
state->read_in >>= bit_count;
state->read_in_length -= bit_count;
return next_sym & DIST_SYM_MASK;
if (bit_count == 0) {
state->read_in_length -= next_sym;
next_sym = INVALID_SYMBOL;
}
return next_sym & DIST_SYM_MASK;
}
}
@ -1123,7 +1149,7 @@ static int inline setup_dynamic_header(struct inflate_state *state)
lit_expand_count[MAX_LIT_LEN_COUNT], dist_count[16];
uint16_t *count;
uint16_t symbol;
uint32_t multisym = DEFAULT_SYM_FLAG, length;
uint32_t multisym = DEFAULT_SYM_FLAG, length, max_dist = DIST_LEN;
struct huff_code *code;
uint64_t flag = 0;
@ -1314,8 +1340,11 @@ static int inline setup_dynamic_header(struct inflate_state *state)
if (set_codes(&lit_and_dist_huff[LIT_LEN], DIST_LEN, dist_count))
return ISAL_INVALID_BLOCK;
if (state->hist_bits && state->hist_bits < 15)
max_dist = 2 * state->hist_bits;
make_inflate_huff_code_dist(&state->dist_huff_code, &lit_and_dist_huff[LIT_LEN],
DIST_LEN, dist_count, DIST_LEN);
DIST_LEN, dist_count, max_dist);
if (set_and_expand_lit_len_huffcode
(lit_and_dist_huff, LIT_LEN, lit_count, lit_expand_count, code_list))
@ -1513,6 +1542,7 @@ int decode_huffman_code_block_stateless_base(struct inflate_state *state, uint8_
uint8_t *next_in_tmp, *next_out_tmp;
uint32_t avail_in_tmp, avail_out_tmp, total_out_tmp;
uint32_t next_lits, sym_count;
struct rfc1951_tables *rfc = &rfc_lookup_table;
state->copy_overflow_length = 0;
state->copy_overflow_distance = 0;
@ -1590,13 +1620,15 @@ int decode_huffman_code_block_stateless_base(struct inflate_state *state, uint8_
repeat_length = next_lit - 254;
next_dist = decode_next_dist(state, &state->dist_huff_code);
if (next_dist >= DIST_LEN)
return ISAL_INVALID_SYMBOL;
if (state->read_in_length >= 0) {
if (next_dist >= DIST_LEN)
return ISAL_INVALID_SYMBOL;
look_back_dist = rfc_lookup_table.dist_start[next_dist] +
inflate_in_read_bits(state,
rfc_lookup_table.dist_extra_bit_count
[next_dist]);
look_back_dist = rfc->dist_start[next_dist] +
inflate_in_read_bits(state,
rfc->dist_extra_bit_count
[next_dist]);
}
if (state->read_in_length < 0) {
state->read_in = read_in_tmp;
@ -1663,6 +1695,7 @@ void isal_inflate_init(struct inflate_state *state)
state->bfinal = 0;
state->crc_flag = 0;
state->crc = 0;
state->hist_bits = 0;
state->type0_block_len = 0;
state->write_overflow_lits = 0;
state->write_overflow_len = 0;
@ -1724,6 +1757,7 @@ int isal_inflate_stateless(struct inflate_state *state)
state->bfinal = 0;
state->crc = 0;
state->total_out = 0;
state->hist_bits = 0;
while (state->block_state != ISAL_BLOCK_FINISH) {
if (state->block_state == ISAL_BLOCK_NEW_HDR) {

1
igzip/inflate_data_structs.asm
View File

@ -118,6 +118,7 @@ FIELD _dict_length, 4, 4
FIELD _bfinal, 4, 4
FIELD _crc_flag, 4, 4
FIELD _crc, 4, 4
FIELD _hist_bits, 4, 4
FIELD _type0_block_len, 4, 4
FIELD _write_overflow_lits, 4, 4
FIELD _write_overflow_len, 4, 4

5
include/igzip_lib.h
View File

@ -472,6 +472,7 @@ struct inflate_state {
uint32_t bfinal; //!< Flag identifying final block
uint32_t crc_flag; //!< Flag identifying whether to track of crc
uint32_t crc; //!< Contains crc of output if crc_flag is set
uint32_t hist_bits; //!< Log base 2 of maximum lookback distance
int32_t type0_block_len; //!< Length left to read of type 0 block when outbuffer overflow occured
int32_t write_overflow_lits;
int32_t write_overflow_len;
@ -731,7 +732,9 @@ int isal_inflate_set_dict(struct inflate_state *state, uint8_t *dict, uint32_t d
* state of the decompression on exit can be read from state->block-state. If
* the crc_flag is set to ISAL_GZIP_NO_HDR the gzip crc of the output is stored
* in state->crc. Alternatively, if the crc_flag is set to ISAL_ZLIB_NO_HDR the
* adler32 of the output is stored in state->crc.
* adler32 of the output is stored in state->crc. The element state->hist_bits
* has values from 0 to 15, where values of 1 to 15 are the log base 2 size of the
* matching window and 0 is the default with maximum history size.
*
* If a dictionary is required, a call to isal_inflate_set_dict will set the
* dictionary.

7
tests/fuzz/igzip_checked_inflate_fuzz_test.c
View File

@ -52,10 +52,13 @@ int LLVMFuzzerTestOneInput(const uint8_t * data, size_t size)
} else if (zret < 0) {
if (zret != Z_BUF_ERROR)
/* If zlib errors, assert isal errors, excluding a few
* cases where zlib is overzealous */
* cases where zlib is overzealous and when zlib notices
* an error faster than isal */
assert(iret < 0 || strcmp(zstate.msg, z_msg_invalid_code_set) == 0
|| strcmp(zstate.msg, z_msg_invalid_dist_set) == 0
|| strcmp(zstate.msg, z_msg_invalid_lit_len_set) == 0);
|| strcmp(zstate.msg, z_msg_invalid_lit_len_set) == 0
|| (iret == ISAL_END_INPUT && zstate.avail_in < 3));
} else
/* If zlib did not finish or error, assert isal did not finish
* or that isal found an invalid header since isal notices the