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Enhance wasm loader checks for opcode br_table (#3352)

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Fix the integer overflow issue when checking target branch depth in opcode
br_table, and fix is_32bit_type not check VALUE_TYPE_ANY issue, which may
cause wasm_loader_push_frame_offset push extra unneeded offset.
This commit is contained in:
Wenyong Huang 2024-04-25 20:07:57 +08:00 committed by GitHub
parent a36c7d5aa9
commit e44465d259
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 34 additions and 27 deletions
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29
core/iwasm/interpreter/wasm_loader.c
View File

@ -293,7 +293,10 @@ type2str(uint8 type)
static bool
is_32bit_type(uint8 type)
{
if (type == VALUE_TYPE_I32 || type == VALUE_TYPE_F32
if (type == VALUE_TYPE_I32
|| type == VALUE_TYPE_F32
/* the operand stack is in polymorphic state */
|| type == VALUE_TYPE_ANY
#if WASM_ENABLE_GC != 0
|| (sizeof(uintptr_t) == 4 && wasm_is_type_reftype(type))
#elif WASM_ENABLE_REF_TYPES != 0
@ -11533,16 +11536,17 @@ re_scan:
#endif
POP_I32();
/* Get the default depth and check it */
/* Get each depth and check it */
p_org = p;
for (i = 0; i <= count; i++) {
read_leb_uint32(p, p_end, depth);
}
if (loader_ctx->csp_num < depth + 1) {
set_error_buf(error_buf, error_buf_size,
"unknown label, "
"unexpected end of section or function");
goto fail;
bh_assert(loader_ctx->csp_num > 0);
if (loader_ctx->csp_num - 1 < depth) {
set_error_buf(error_buf, error_buf_size,
"unknown label, "
"unexpected end of section or function");
goto fail;
}
}
p = p_org;
@ -11558,12 +11562,6 @@ re_scan:
for (i = 0; i <= count; i++) {
p_org = p;
read_leb_uint32(p, p_end, depth);
if (loader_ctx->csp_num < depth + 1) {
set_error_buf(error_buf, error_buf_size,
"unknown label, "
"unexpected end of section or function");
goto fail;
}
p = p_org;
/* Get the target block's arity and check it */
@ -11965,8 +11963,7 @@ re_scan:
loader_ctx->reftype_map_num--;
}
#endif
if (is_32bit_type(*(loader_ctx->frame_ref - 1))
|| *(loader_ctx->frame_ref - 1) == VALUE_TYPE_ANY) {
if (is_32bit_type(*(loader_ctx->frame_ref - 1))) {
loader_ctx->frame_ref--;
loader_ctx->stack_cell_num--;
#if WASM_ENABLE_FAST_INTERP != 0

32
core/iwasm/interpreter/wasm_mini_loader.c
View File

@ -67,7 +67,10 @@ set_error_buf(char *error_buf, uint32 error_buf_size, const char *string)
static bool
is_32bit_type(uint8 type)
{
if (type == VALUE_TYPE_I32 || type == VALUE_TYPE_F32
if (type == VALUE_TYPE_I32
|| type == VALUE_TYPE_F32
/* the operand stack is in polymorphic state */
|| type == VALUE_TYPE_ANY
#if WASM_ENABLE_REF_TYPES != 0
|| type == VALUE_TYPE_FUNCREF || type == VALUE_TYPE_EXTERNREF
#endif
@ -4237,7 +4240,7 @@ wasm_loader_pop_frame_ref(WASMLoaderContext *ctx, uint8 type, char *error_buf,
ctx->frame_ref--;
ctx->stack_cell_num--;
if (is_32bit_type(type) || *ctx->frame_ref == VALUE_TYPE_ANY)
if (is_32bit_type(type))
return true;
ctx->frame_ref--;
@ -6351,13 +6354,11 @@ re_scan:
case WASM_OP_BR_TABLE:
{
uint8 *ret_types = NULL;
uint32 ret_count = 0;
uint32 ret_count = 0, depth = 0;
#if WASM_ENABLE_FAST_INTERP == 0
uint8 *p_depth_begin, *p_depth;
uint32 depth, j;
BrTableCache *br_table_cache = NULL;
p_org = p - 1;
uint8 *p_depth_begin, *p_depth, *p_opcode = p - 1;
uint32 j;
#endif
read_leb_uint32(p, p_end, count);
@ -6366,6 +6367,16 @@ re_scan:
#endif
POP_I32();
/* Get each depth and check it */
p_org = p;
for (i = 0; i <= count; i++) {
read_leb_uint32(p, p_end, depth);
bh_assert(loader_ctx->csp_num > 0);
bh_assert(loader_ctx->csp_num - 1 >= depth);
(void)depth;
}
p = p_org;
#if WASM_ENABLE_FAST_INTERP == 0
p_depth_begin = p_depth = p;
#endif
@ -6391,8 +6402,8 @@ re_scan:
error_buf, error_buf_size))) {
goto fail;
}
*p_org = EXT_OP_BR_TABLE_CACHE;
br_table_cache->br_table_op_addr = p_org;
*p_opcode = EXT_OP_BR_TABLE_CACHE;
br_table_cache->br_table_op_addr = p_opcode;
br_table_cache->br_count = count;
/* Copy previous depths which are one byte */
for (j = 0; j < i; j++) {
@ -6623,8 +6634,7 @@ re_scan:
&& !cur_block->is_stack_polymorphic));
if (available_stack_cell > 0) {
if (is_32bit_type(*(loader_ctx->frame_ref - 1))
|| *(loader_ctx->frame_ref - 1) == VALUE_TYPE_ANY) {
if (is_32bit_type(*(loader_ctx->frame_ref - 1))) {
loader_ctx->frame_ref--;
loader_ctx->stack_cell_num--;
#if WASM_ENABLE_FAST_INTERP != 0