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Fix data races in atomic wait/notify and interp goto table (#1971)

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Add shared memory lock when accessing the address to atomic wait/notify
inside linear memory to resolve its data race issue.

And statically initialize the goto table of interpreter labels to resolve the
data race issue of accessing the table.
This commit is contained in:
Enrico Loparco 2023-02-22 04:43:49 +01:00 committed by GitHub
parent 0fa0813a5a
commit bc60064de5
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 37 additions and 19 deletions
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36
core/iwasm/common/wasm_shared_memory.c
View File

@ -157,13 +157,13 @@ int32
shared_memory_inc_reference(WASMModuleCommon *module)
{
WASMSharedMemNode *node = search_module(module);
uint32 ref_count = -1;
if (node) {
os_mutex_lock(&node->lock);
node->ref_count++;
ref_count = ++node->ref_count;
os_mutex_unlock(&node->lock);
return node->ref_count;
}
return -1;
return ref_count;
}
int32
@ -385,7 +385,8 @@ wasm_runtime_atomic_wait(WASMModuleInstanceCommon *module, void *address,
WASMModuleInstance *module_inst = (WASMModuleInstance *)module;
AtomicWaitInfo *wait_info;
AtomicWaitNode *wait_node;
bool check_ret, is_timeout;
WASMSharedMemNode *node;
bool check_ret, is_timeout, no_wait;
bh_assert(module->module_type == Wasm_Module_Bytecode
|| module->module_type == Wasm_Module_AoT);
@ -417,8 +418,13 @@ wasm_runtime_atomic_wait(WASMModuleInstanceCommon *module, void *address,
os_mutex_lock(&wait_info->wait_list_lock);
if ((!wait64 && *(uint32 *)address != (uint32)expect)
|| (wait64 && *(uint64 *)address != expect)) {
node = search_module((WASMModuleCommon *)module_inst->module);
os_mutex_lock(&node->shared_mem_lock);
no_wait = (!wait64 && *(uint32 *)address != (uint32)expect)
|| (wait64 && *(uint64 *)address != expect);
os_mutex_unlock(&node->shared_mem_lock);
if (no_wait) {
os_mutex_unlock(&wait_info->wait_list_lock);
return 1;
}
@ -476,7 +482,9 @@ wasm_runtime_atomic_wait(WASMModuleInstanceCommon *module, void *address,
wasm_runtime_free(wait_node);
os_mutex_unlock(&wait_info->wait_list_lock);
os_mutex_lock(&node->shared_mem_lock);
release_wait_info(wait_map, wait_info, address);
os_mutex_unlock(&node->shared_mem_lock);
(void)check_ret;
return is_timeout ? 2 : 0;
@ -489,17 +497,29 @@ wasm_runtime_atomic_notify(WASMModuleInstanceCommon *module, void *address,
WASMModuleInstance *module_inst = (WASMModuleInstance *)module;
uint32 notify_result;
AtomicWaitInfo *wait_info;
WASMSharedMemNode *node;
bool out_of_bounds;
bh_assert(module->module_type == Wasm_Module_Bytecode
|| module->module_type == Wasm_Module_AoT);
if ((uint8 *)address < module_inst->memories[0]->memory_data
|| (uint8 *)address + 4 > module_inst->memories[0]->memory_data_end) {
node = search_module((WASMModuleCommon *)module_inst->module);
if (node)
os_mutex_lock(&node->shared_mem_lock);
out_of_bounds =
((uint8 *)address < module_inst->memories[0]->memory_data
|| (uint8 *)address + 4 > module_inst->memories[0]->memory_data_end);
if (out_of_bounds) {
if (node)
os_mutex_unlock(&node->shared_mem_lock);
wasm_runtime_set_exception(module, "out of bounds memory access");
return -1;
}
wait_info = acquire_wait_info(address, false);
if (node)
os_mutex_unlock(&node->shared_mem_lock);
/* Nobody wait on this address */
if (!wait_info)

20
core/iwasm/interpreter/wasm_opcode.h
View File

@ -675,12 +675,14 @@ typedef enum WASMAtomicEXTOpcode {
} WASMAtomicEXTOpcode;
#if WASM_ENABLE_DEBUG_INTERP != 0
#define DEF_DEBUG_BREAK_HANDLE(_name) \
_name[DEBUG_OP_BREAK] = HANDLE_OPCODE(DEBUG_OP_BREAK); /* 0xd7 */
#define DEF_DEBUG_BREAK_HANDLE() \
[DEBUG_OP_BREAK] = HANDLE_OPCODE(DEBUG_OP_BREAK), /* 0xd7 */
#else
#define DEF_DEBUG_BREAK_HANDLE(_name)
#define DEF_DEBUG_BREAK_HANDLE()
#endif
#define SET_GOTO_TABLE_ELEM(opcode) [opcode] = HANDLE_OPCODE(opcode)
/*
* Macro used to generate computed goto tables for the C interpreter.
*/
@ -903,14 +905,10 @@ typedef enum WASMAtomicEXTOpcode {
HANDLE_OPCODE(EXT_OP_LOOP), /* 0xd4 */ \
HANDLE_OPCODE(EXT_OP_IF), /* 0xd5 */ \
HANDLE_OPCODE(EXT_OP_BR_TABLE_CACHE), /* 0xd6 */ \
}; \
do { \
_name[WASM_OP_MISC_PREFIX] = \
HANDLE_OPCODE(WASM_OP_MISC_PREFIX); /* 0xfc */ \
_name[WASM_OP_ATOMIC_PREFIX] = \
HANDLE_OPCODE(WASM_OP_ATOMIC_PREFIX); /* 0xfe */ \
DEF_DEBUG_BREAK_HANDLE(_name) \
} while (0)
SET_GOTO_TABLE_ELEM(WASM_OP_MISC_PREFIX), /* 0xfc */ \
SET_GOTO_TABLE_ELEM(WASM_OP_ATOMIC_PREFIX), /* 0xfe */ \
DEF_DEBUG_BREAK_HANDLE() \
};
#ifdef __cplusplus
}