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fix(scanner): serialize buffer size check

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During the check that we dont overflow the serialization buffer we
erroneously checked with size(uint32_t) == 1 which could cause us to
crash with some input strings.

Signed-off-by: Michael Hoffmann <mhoffm@posteo.de>
This commit is contained in:
Michael Hoffmann
2024-06-17 06:54:01 +02:00
committed by GitHub
parent e936d3fef8
commit e2d416afeb
2 changed files with 16 additions and 10 deletions
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11
dialects/terraform/src/scanner.c
View File

@@ -100,7 +100,7 @@ typedef struct {
String string_new() { return (String){.cap = 16, .len = 0, .data = calloc(1, sizeof(char) * 17)}; }
typedef struct {
enum ContextType type;
ContextType type;
// valid if type == HEREDOC_TEMPLATE
String heredoc_identifier;
@@ -131,13 +131,14 @@ static unsigned serialize(Scanner *scanner, char *buf) {
size += sizeof(uint32_t);
for (int i = 0; i < scanner->context_stack.len; i++) {
Context *context = &scanner->context_stack.data[i];
if (size + 2 + context->heredoc_identifier.len >= TREE_SITTER_SERIALIZATION_BUFFER_SIZE) {
if (size + sizeof(ContextType) + sizeof(uint32_t) + context->heredoc_identifier.len >= TREE_SITTER_SERIALIZATION_BUFFER_SIZE) {
return 0;
}
if (context->heredoc_identifier.len > CHAR_MAX) {
return 0;
}
buf[size++] = context->type;
memcpy(&buf[size], &(context->type), sizeof(ContextType));
size += sizeof(ContextType);
memcpy(&buf[size], &(context->heredoc_identifier.len), sizeof(uint32_t));
size += sizeof(uint32_t);
memcpy(&buf[size], context->heredoc_identifier.data, context->heredoc_identifier.len);
@@ -160,7 +161,9 @@ static void deserialize(Scanner *scanner, const char *buffer, unsigned length) {
for (uint32_t j = 0; j < context_stack_size; j++) {
Context ctx;
ctx.heredoc_identifier = string_new();
ctx.type = (enum ContextType)buffer[size++];
memcpy(&(ctx.type), &buffer[size], sizeof(ContextType));
size += sizeof(ContextType);
uint32_t heredoc_identifier_size;
memcpy(&heredoc_identifier_size, &buffer[size], sizeof(uint32_t));

15
src/scanner.c
View File

@@ -84,12 +84,12 @@ enum TokenType {
HEREDOC_IDENTIFIER,
};
enum ContextType {
typedef enum ContextType {
TEMPLATE_INTERPOLATION,
TEMPLATE_DIRECTIVE,
QUOTED_TEMPLATE,
HEREDOC_TEMPLATE,
};
} ContextType;
typedef struct {
uint32_t cap;
@@ -100,7 +100,7 @@ typedef struct {
String string_new() { return (String){.cap = 16, .len = 0, .data = calloc(1, sizeof(char) * 17)}; }
typedef struct {
enum ContextType type;
ContextType type;
// valid if type == HEREDOC_TEMPLATE
String heredoc_identifier;
@@ -131,13 +131,14 @@ static unsigned serialize(Scanner *scanner, char *buf) {
size += sizeof(uint32_t);
for (int i = 0; i < scanner->context_stack.len; i++) {
Context *context = &scanner->context_stack.data[i];
if (size + 2 + context->heredoc_identifier.len >= TREE_SITTER_SERIALIZATION_BUFFER_SIZE) {
if (size + sizeof(ContextType) + sizeof(uint32_t) + context->heredoc_identifier.len >= TREE_SITTER_SERIALIZATION_BUFFER_SIZE) {
return 0;
}
if (context->heredoc_identifier.len > CHAR_MAX) {
return 0;
}
buf[size++] = context->type;
memcpy(&buf[size], &(context->type), sizeof(ContextType));
size += sizeof(ContextType);
memcpy(&buf[size], &(context->heredoc_identifier.len), sizeof(uint32_t));
size += sizeof(uint32_t);
memcpy(&buf[size], context->heredoc_identifier.data, context->heredoc_identifier.len);
@@ -160,7 +161,9 @@ static void deserialize(Scanner *scanner, const char *buffer, unsigned length) {
for (uint32_t j = 0; j < context_stack_size; j++) {
Context ctx;
ctx.heredoc_identifier = string_new();
ctx.type = (enum ContextType)buffer[size++];
memcpy(&(ctx.type), &buffer[size], sizeof(ContextType));
size += sizeof(ContextType);
uint32_t heredoc_identifier_size;
memcpy(&heredoc_identifier_size, &buffer[size], sizeof(uint32_t));