Fix marshalls size checks.
Yesterday, when playing around with my network code, I realized there is a security issue in decode_variant, at least when decoding PoolArrays. Basically, the size of the PoolArray is encoded in a uint32_t, when decoding it, that value is cast to int when comparing if the packet is actually that size causing numbers with MSB=1 to be interpreted as negative thus always passing the check. That same value though, is used as uint32_t again to resize the output vector. For this reason, sending a malformed packet with declared type PoolByteArray and size of 2^31(+x) causes the engine to try to allocate 2+GB of pool memory, causing the engine to crash.
This commit is contained in:
Fabio Alessandrelli
Hein-Pieter van Braam
parent
1a325e3580
commit
5262d1bbcc
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@ -32,8 +32,13 @@
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#include "os/keyboard.h"
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#include "print_string.h"
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#include "reference.h"
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#include <limits.h>
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#include <stdio.h>
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#define _S(a) ((int32_t)a)
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#define ERR_FAIL_ADD_OF(a, b, err) ERR_FAIL_COND_V(_S(b) < 0 || _S(a) < 0 || _S(a) > INT_MAX - _S(b), err)
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#define ERR_FAIL_MUL_OF(a, b, err) ERR_FAIL_COND_V(_S(a) < 0 || _S(b) <= 0 || _S(a) > INT_MAX / _S(b), err)
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void EncodedObjectAsID::_bind_methods() {
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ClassDB::bind_method(D_METHOD("set_object_id", "id"), &EncodedObjectAsID::set_object_id);
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ClassDB::bind_method(D_METHOD("get_object_id"), &EncodedObjectAsID::get_object_id);
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@ -60,23 +65,31 @@ EncodedObjectAsID::EncodedObjectAsID() {
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static Error _decode_string(const uint8_t *&buf, int &len, int *r_len, String &r_string) {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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uint32_t strlen = decode_uint32(buf);
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buf += 4;
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len -= 4;
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ERR_FAIL_COND_V((int)strlen > len, ERR_FILE_EOF);
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int32_t strlen = decode_uint32(buf);
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int32_t pad = 0;
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String str;
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str.parse_utf8((const char *)buf, strlen);
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r_string = str;
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//handle padding
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// Handle padding
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if (strlen % 4) {
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strlen += 4 - strlen % 4;
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pad = 4 - strlen % 4;
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}
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buf += 4;
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len -= 4;
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// Ensure buffer is big enough
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ERR_FAIL_ADD_OF(strlen, pad, ERR_FILE_EOF);
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ERR_FAIL_COND_V(strlen < 0 || strlen + pad > len, ERR_FILE_EOF);
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String str;
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ERR_FAIL_COND_V(str.parse_utf8((const char *)buf, strlen), ERR_INVALID_DATA);
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r_string = str;
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// Add padding
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strlen += pad;
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// Update buffer pos, left data count, and return size
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buf += strlen;
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len -= strlen;
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if (r_len) {
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(*r_len) += 4 + strlen;
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}
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@ -119,14 +132,15 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} break;
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case Variant::INT: {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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if (type & ENCODE_FLAG_64) {
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ERR_FAIL_COND_V(len < 8, ERR_INVALID_DATA);
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int64_t val = decode_uint64(buf);
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r_variant = val;
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if (r_len)
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(*r_len) += 8;
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} else {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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int32_t val = decode_uint32(buf);
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r_variant = val;
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if (r_len)
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@ -136,14 +150,14 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} break;
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case Variant::REAL: {
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ERR_FAIL_COND_V(len < (int)4, ERR_INVALID_DATA);
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if (type & ENCODE_FLAG_64) {
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ERR_FAIL_COND_V(len < 8, ERR_INVALID_DATA);
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double val = decode_double(buf);
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r_variant = val;
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if (r_len)
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(*r_len) += 8;
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} else {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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float val = decode_float(buf);
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r_variant = val;
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if (r_len)
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@ -164,7 +178,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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// math types
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case Variant::VECTOR2: {
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ERR_FAIL_COND_V(len < (int)4 * 2, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(len < 4 * 2, ERR_INVALID_DATA);
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Vector2 val;
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val.x = decode_float(&buf[0]);
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val.y = decode_float(&buf[4]);
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@ -176,7 +190,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} break; // 5
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case Variant::RECT2: {
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ERR_FAIL_COND_V(len < (int)4 * 4, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(len < 4 * 4, ERR_INVALID_DATA);
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Rect2 val;
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val.position.x = decode_float(&buf[0]);
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val.position.y = decode_float(&buf[4]);
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@ -190,7 +204,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} break;
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case Variant::VECTOR3: {
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ERR_FAIL_COND_V(len < (int)4 * 3, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(len < 4 * 3, ERR_INVALID_DATA);
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Vector3 val;
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val.x = decode_float(&buf[0]);
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val.y = decode_float(&buf[4]);
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@ -203,7 +217,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} break;
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case Variant::TRANSFORM2D: {
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ERR_FAIL_COND_V(len < (int)4 * 6, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(len < 4 * 6, ERR_INVALID_DATA);
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Transform2D val;
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for (int i = 0; i < 3; i++) {
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for (int j = 0; j < 2; j++) {
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@ -220,7 +234,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} break;
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case Variant::PLANE: {
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ERR_FAIL_COND_V(len < (int)4 * 4, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(len < 4 * 4, ERR_INVALID_DATA);
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Plane val;
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val.normal.x = decode_float(&buf[0]);
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val.normal.y = decode_float(&buf[4]);
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@ -234,7 +248,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} break;
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case Variant::QUAT: {
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ERR_FAIL_COND_V(len < (int)4 * 4, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(len < 4 * 4, ERR_INVALID_DATA);
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Quat val;
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val.x = decode_float(&buf[0]);
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val.y = decode_float(&buf[4]);
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@ -248,7 +262,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} break;
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case Variant::AABB: {
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ERR_FAIL_COND_V(len < (int)4 * 6, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(len < 4 * 6, ERR_INVALID_DATA);
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AABB val;
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val.position.x = decode_float(&buf[0]);
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val.position.y = decode_float(&buf[4]);
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@ -264,7 +278,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} break;
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case Variant::BASIS: {
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ERR_FAIL_COND_V(len < (int)4 * 9, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(len < 4 * 9, ERR_INVALID_DATA);
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Basis val;
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for (int i = 0; i < 3; i++) {
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for (int j = 0; j < 3; j++) {
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@ -281,7 +295,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} break;
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case Variant::TRANSFORM: {
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ERR_FAIL_COND_V(len < (int)4 * 12, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(len < 4 * 12, ERR_INVALID_DATA);
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Transform val;
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for (int i = 0; i < 3; i++) {
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for (int j = 0; j < 3; j++) {
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@ -303,7 +317,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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// misc types
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case Variant::COLOR: {
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ERR_FAIL_COND_V(len < (int)4 * 4, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(len < 4 * 4, ERR_INVALID_DATA);
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Color val;
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val.r = decode_float(&buf[0]);
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val.g = decode_float(&buf[4]);
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@ -318,7 +332,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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case Variant::NODE_PATH: {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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uint32_t strlen = decode_uint32(buf);
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int32_t strlen = decode_uint32(buf);
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if (strlen & 0x80000000) {
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//new format
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@ -343,31 +357,15 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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for (uint32_t i = 0; i < total; i++) {
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ERR_FAIL_COND_V((int)len < 4, ERR_INVALID_DATA);
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strlen = decode_uint32(buf);
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int pad = 0;
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if (strlen % 4)
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pad += 4 - strlen % 4;
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buf += 4;
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len -= 4;
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ERR_FAIL_COND_V((int)strlen + pad > len, ERR_INVALID_DATA);
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String str;
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str.parse_utf8((const char *)buf, strlen);
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Error err = _decode_string(buf, len, r_len, str);
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if (err)
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return err;
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if (i < namecount)
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names.push_back(str);
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else
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subnames.push_back(str);
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buf += strlen + pad;
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len -= strlen + pad;
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if (r_len)
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(*r_len) += 4 + strlen + pad;
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}
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r_variant = NodePath(names, subnames, flags & 1);
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@ -375,17 +373,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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} else {
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//old format, just a string
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buf += 4;
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len -= 4;
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ERR_FAIL_COND_V((int)strlen > len, ERR_INVALID_DATA);
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String str;
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str.parse_utf8((const char *)buf, strlen);
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r_variant = NodePath(str);
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if (r_len)
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(*r_len) += 4 + strlen;
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ERR_FAIL_V(ERR_INVALID_DATA);
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}
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} break;
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@ -402,6 +390,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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if (type & ENCODE_FLAG_OBJECT_AS_ID) {
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//this _is_ allowed
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ERR_FAIL_COND_V(len < 8, ERR_INVALID_DATA);
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ObjectID val = decode_uint64(buf);
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if (r_len)
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(*r_len) += 8;
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@ -475,7 +464,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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case Variant::DICTIONARY: {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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uint32_t count = decode_uint32(buf);
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int32_t count = decode_uint32(buf);
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// bool shared = count&0x80000000;
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count &= 0x7FFFFFFF;
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@ -488,7 +477,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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Dictionary d;
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for (uint32_t i = 0; i < count; i++) {
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for (int i = 0; i < count; i++) {
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Variant key, value;
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@ -520,7 +509,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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case Variant::ARRAY: {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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uint32_t count = decode_uint32(buf);
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int32_t count = decode_uint32(buf);
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// bool shared = count&0x80000000;
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count &= 0x7FFFFFFF;
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@ -533,7 +522,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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Array varr;
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for (uint32_t i = 0; i < count; i++) {
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for (int i = 0; i < count; i++) {
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int used = 0;
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Variant v;
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@ -555,17 +544,17 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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case Variant::POOL_BYTE_ARRAY: {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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uint32_t count = decode_uint32(buf);
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int32_t count = decode_uint32(buf);
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buf += 4;
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len -= 4;
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ERR_FAIL_COND_V((int)count > len, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(count < 0 || count > len, ERR_INVALID_DATA);
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PoolVector<uint8_t> data;
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if (count) {
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data.resize(count);
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PoolVector<uint8_t>::Write w = data.write();
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for (uint32_t i = 0; i < count; i++) {
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for (int32_t i = 0; i < count; i++) {
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w[i] = buf[i];
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}
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@ -585,10 +574,11 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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case Variant::POOL_INT_ARRAY: {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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uint32_t count = decode_uint32(buf);
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int32_t count = decode_uint32(buf);
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buf += 4;
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len -= 4;
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ERR_FAIL_COND_V((int)count * 4 > len, ERR_INVALID_DATA);
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ERR_FAIL_MUL_OF(count, 4, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(count < 0 || count * 4 > len, ERR_INVALID_DATA);
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PoolVector<int> data;
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@ -596,7 +586,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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//const int*rbuf=(const int*)buf;
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data.resize(count);
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PoolVector<int>::Write w = data.write();
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for (uint32_t i = 0; i < count; i++) {
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for (int32_t i = 0; i < count; i++) {
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w[i] = decode_uint32(&buf[i * 4]);
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}
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@ -612,10 +602,11 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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case Variant::POOL_REAL_ARRAY: {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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uint32_t count = decode_uint32(buf);
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int32_t count = decode_uint32(buf);
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buf += 4;
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len -= 4;
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ERR_FAIL_COND_V((int)count * 4 > len, ERR_INVALID_DATA);
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ERR_FAIL_MUL_OF(count, 4, ERR_INVALID_DATA);
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ERR_FAIL_COND_V(count < 0 || count * 4 > len, ERR_INVALID_DATA);
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PoolVector<float> data;
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@ -623,7 +614,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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//const float*rbuf=(const float*)buf;
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data.resize(count);
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PoolVector<float>::Write w = data.write();
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for (uint32_t i = 0; i < count; i++) {
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for (int32_t i = 0; i < count; i++) {
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w[i] = decode_float(&buf[i * 4]);
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}
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@ -640,7 +631,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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case Variant::POOL_STRING_ARRAY: {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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uint32_t count = decode_uint32(buf);
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int32_t count = decode_uint32(buf);
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PoolVector<String> strings;
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buf += 4;
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@ -650,35 +641,14 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
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(*r_len) += 4;
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//printf("string count: %i\n",count);
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for (int i = 0; i < (int)count; i++) {
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for (int32_t i = 0; i < count; i++) {
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ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
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uint32_t strlen = decode_uint32(buf);
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buf += 4;
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len -= 4;
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ERR_FAIL_COND_V((int)strlen > len, ERR_INVALID_DATA);
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//printf("loaded string: %s\n",(const char*)buf);
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String str;
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str.parse_utf8((const char *)buf, strlen);
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Error err = _decode_string(buf, len, r_len, str);
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if (err)
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return err;
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strings.push_back(str);
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buf += strlen;
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len -= strlen;
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if (r_len)
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(*r_len) += 4 + strlen;
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if (strlen % 4) {
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int pad = 4 - (strlen % 4);
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buf += pad;
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len -= pad;
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if (r_len) {
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(*r_len) += pad;
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}
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||||
}
|
||||
}
|
||||
|
||||
r_variant = strings;
|
||||
|
|
@ -687,11 +657,12 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
|
|||
case Variant::POOL_VECTOR2_ARRAY: {
|
||||
|
||||
ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
|
||||
uint32_t count = decode_uint32(buf);
|
||||
int32_t count = decode_uint32(buf);
|
||||
buf += 4;
|
||||
len -= 4;
|
||||
|
||||
ERR_FAIL_COND_V((int)count * 4 * 2 > len, ERR_INVALID_DATA);
|
||||
ERR_FAIL_MUL_OF(count, 4 * 2, ERR_INVALID_DATA);
|
||||
ERR_FAIL_COND_V(count < 0 || count * 4 * 2 > len, ERR_INVALID_DATA);
|
||||
PoolVector<Vector2> varray;
|
||||
|
||||
if (r_len) {
|
||||
|
|
@ -702,7 +673,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
|
|||
varray.resize(count);
|
||||
PoolVector<Vector2>::Write w = varray.write();
|
||||
|
||||
for (int i = 0; i < (int)count; i++) {
|
||||
for (int32_t i = 0; i < count; i++) {
|
||||
|
||||
w[i].x = decode_float(buf + i * 4 * 2 + 4 * 0);
|
||||
w[i].y = decode_float(buf + i * 4 * 2 + 4 * 1);
|
||||
|
|
@ -722,11 +693,13 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
|
|||
case Variant::POOL_VECTOR3_ARRAY: {
|
||||
|
||||
ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
|
||||
uint32_t count = decode_uint32(buf);
|
||||
int32_t count = decode_uint32(buf);
|
||||
buf += 4;
|
||||
len -= 4;
|
||||
|
||||
ERR_FAIL_COND_V((int)count * 4 * 3 > len, ERR_INVALID_DATA);
|
||||
ERR_FAIL_MUL_OF(count, 4 * 3, ERR_INVALID_DATA);
|
||||
ERR_FAIL_COND_V(count < 0 || count * 4 * 3 > len, ERR_INVALID_DATA);
|
||||
|
||||
PoolVector<Vector3> varray;
|
||||
|
||||
if (r_len) {
|
||||
|
|
@ -737,7 +710,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
|
|||
varray.resize(count);
|
||||
PoolVector<Vector3>::Write w = varray.write();
|
||||
|
||||
for (int i = 0; i < (int)count; i++) {
|
||||
for (int32_t i = 0; i < count; i++) {
|
||||
|
||||
w[i].x = decode_float(buf + i * 4 * 3 + 4 * 0);
|
||||
w[i].y = decode_float(buf + i * 4 * 3 + 4 * 1);
|
||||
|
|
@ -758,11 +731,13 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
|
|||
case Variant::POOL_COLOR_ARRAY: {
|
||||
|
||||
ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
|
||||
uint32_t count = decode_uint32(buf);
|
||||
int32_t count = decode_uint32(buf);
|
||||
buf += 4;
|
||||
len -= 4;
|
||||
|
||||
ERR_FAIL_COND_V((int)count * 4 * 4 > len, ERR_INVALID_DATA);
|
||||
ERR_FAIL_MUL_OF(count, 4 * 4, ERR_INVALID_DATA);
|
||||
ERR_FAIL_COND_V(count < 0 || count * 4 * 4 > len, ERR_INVALID_DATA);
|
||||
|
||||
PoolVector<Color> carray;
|
||||
|
||||
if (r_len) {
|
||||
|
|
@ -773,7 +748,7 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
|
|||
carray.resize(count);
|
||||
PoolVector<Color>::Write w = carray.write();
|
||||
|
||||
for (int i = 0; i < (int)count; i++) {
|
||||
for (int32_t i = 0; i < count; i++) {
|
||||
|
||||
w[i].r = decode_float(buf + i * 4 * 4 + 4 * 0);
|
||||
w[i].g = decode_float(buf + i * 4 * 4 + 4 * 1);
|
||||
|
|
@ -1321,7 +1296,7 @@ Error encode_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len, bo
|
|||
while (r_len % 4) {
|
||||
r_len++; //pad
|
||||
if (buf)
|
||||
buf++;
|
||||
*(buf++) = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue