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-rw-r--r--src/util/asmap.cpp110
-rw-r--r--src/util/asmap.h5
-rw-r--r--src/util/translation.h14
3 files changed, 115 insertions, 14 deletions
diff --git a/src/util/asmap.cpp b/src/util/asmap.cpp
index 5354cdb962..b4090482b9 100644
--- a/src/util/asmap.cpp
+++ b/src/util/asmap.cpp
@@ -2,12 +2,15 @@
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#include <map>
#include <vector>
#include <assert.h>
#include <crypto/common.h>
namespace {
+constexpr uint32_t INVALID = 0xFFFFFFFF;
+
uint32_t DecodeBits(std::vector<bool>::const_iterator& bitpos, const std::vector<bool>::const_iterator& endpos, uint8_t minval, const std::vector<uint8_t> &bit_sizes)
{
uint32_t val = minval;
@@ -25,7 +28,7 @@ uint32_t DecodeBits(std::vector<bool>::const_iterator& bitpos, const std::vector
val += (1 << *bit_sizes_it);
} else {
for (int b = 0; b < *bit_sizes_it; b++) {
- if (bitpos == endpos) break;
+ if (bitpos == endpos) return INVALID; // Reached EOF in mantissa
bit = *bitpos;
bitpos++;
val += bit << (*bit_sizes_it - 1 - b);
@@ -33,13 +36,21 @@ uint32_t DecodeBits(std::vector<bool>::const_iterator& bitpos, const std::vector
return val;
}
}
- return -1;
+ return INVALID; // Reached EOF in exponent
}
+enum class Instruction : uint32_t
+{
+ RETURN = 0,
+ JUMP = 1,
+ MATCH = 2,
+ DEFAULT = 3,
+};
+
const std::vector<uint8_t> TYPE_BIT_SIZES{0, 0, 1};
-uint32_t DecodeType(std::vector<bool>::const_iterator& bitpos, const std::vector<bool>::const_iterator& endpos)
+Instruction DecodeType(std::vector<bool>::const_iterator& bitpos, const std::vector<bool>::const_iterator& endpos)
{
- return DecodeBits(bitpos, endpos, 0, TYPE_BIT_SIZES);
+ return Instruction(DecodeBits(bitpos, endpos, 0, TYPE_BIT_SIZES));
}
const std::vector<uint8_t> ASN_BIT_SIZES{15, 16, 17, 18, 19, 20, 21, 22, 23, 24};
@@ -70,34 +81,105 @@ uint32_t Interpret(const std::vector<bool> &asmap, const std::vector<bool> &ip)
const std::vector<bool>::const_iterator endpos = asmap.end();
uint8_t bits = ip.size();
uint32_t default_asn = 0;
- uint32_t opcode, jump, match, matchlen;
+ uint32_t jump, match, matchlen;
+ Instruction opcode;
while (pos != endpos) {
opcode = DecodeType(pos, endpos);
- if (opcode == 0) {
- return DecodeASN(pos, endpos);
- } else if (opcode == 1) {
+ if (opcode == Instruction::RETURN) {
+ default_asn = DecodeASN(pos, endpos);
+ if (default_asn == INVALID) break; // ASN straddles EOF
+ return default_asn;
+ } else if (opcode == Instruction::JUMP) {
jump = DecodeJump(pos, endpos);
- if (bits == 0) break;
+ if (jump == INVALID) break; // Jump offset straddles EOF
+ if (bits == 0) break; // No input bits left
+ if (jump >= endpos - pos) break; // Jumping past EOF
if (ip[ip.size() - bits]) {
- if (jump >= endpos - pos) break;
pos += jump;
}
bits--;
- } else if (opcode == 2) {
+ } else if (opcode == Instruction::MATCH) {
match = DecodeMatch(pos, endpos);
+ if (match == INVALID) break; // Match bits straddle EOF
matchlen = CountBits(match) - 1;
+ if (bits < matchlen) break; // Not enough input bits
for (uint32_t bit = 0; bit < matchlen; bit++) {
- if (bits == 0) break;
if ((ip[ip.size() - bits]) != ((match >> (matchlen - 1 - bit)) & 1)) {
return default_asn;
}
bits--;
}
- } else if (opcode == 3) {
+ } else if (opcode == Instruction::DEFAULT) {
default_asn = DecodeASN(pos, endpos);
+ if (default_asn == INVALID) break; // ASN straddles EOF
} else {
- break;
+ break; // Instruction straddles EOF
}
}
+ assert(false); // Reached EOF without RETURN, or aborted (see any of the breaks above) - should have been caught by SanityCheckASMap below
return 0; // 0 is not a valid ASN
}
+
+bool SanityCheckASMap(const std::vector<bool>& asmap, int bits)
+{
+ const std::vector<bool>::const_iterator begin = asmap.begin(), endpos = asmap.end();
+ std::vector<bool>::const_iterator pos = begin;
+ std::vector<std::pair<uint32_t, int>> jumps; // All future positions we may jump to (bit offset in asmap -> bits to consume left)
+ jumps.reserve(bits);
+ Instruction prevopcode = Instruction::JUMP;
+ bool had_incomplete_match = false;
+ while (pos != endpos) {
+ uint32_t offset = pos - begin;
+ if (!jumps.empty() && offset >= jumps.back().first) return false; // There was a jump into the middle of the previous instruction
+ Instruction opcode = DecodeType(pos, endpos);
+ if (opcode == Instruction::RETURN) {
+ if (prevopcode == Instruction::DEFAULT) return false; // There should not be any RETURN immediately after a DEFAULT (could be combined into just RETURN)
+ uint32_t asn = DecodeASN(pos, endpos);
+ if (asn == INVALID) return false; // ASN straddles EOF
+ if (jumps.empty()) {
+ // Nothing to execute anymore
+ if (endpos - pos > 7) return false; // Excessive padding
+ while (pos != endpos) {
+ if (*pos) return false; // Nonzero padding bit
+ ++pos;
+ }
+ return true; // Sanely reached EOF
+ } else {
+ // Continue by pretending we jumped to the next instruction
+ offset = pos - begin;
+ if (offset != jumps.back().first) return false; // Unreachable code
+ bits = jumps.back().second; // Restore the number of bits we would have had left after this jump
+ jumps.pop_back();
+ prevopcode = Instruction::JUMP;
+ }
+ } else if (opcode == Instruction::JUMP) {
+ uint32_t jump = DecodeJump(pos, endpos);
+ if (jump == INVALID) return false; // Jump offset straddles EOF
+ if (jump > endpos - pos) return false; // Jump out of range
+ if (bits == 0) return false; // Consuming bits past the end of the input
+ --bits;
+ uint32_t jump_offset = pos - begin + jump;
+ if (!jumps.empty() && jump_offset >= jumps.back().first) return false; // Intersecting jumps
+ jumps.emplace_back(jump_offset, bits);
+ prevopcode = Instruction::JUMP;
+ } else if (opcode == Instruction::MATCH) {
+ uint32_t match = DecodeMatch(pos, endpos);
+ if (match == INVALID) return false; // Match bits straddle EOF
+ int matchlen = CountBits(match) - 1;
+ if (prevopcode != Instruction::MATCH) had_incomplete_match = false;
+ if (matchlen < 8 && had_incomplete_match) return false; // Within a sequence of matches only at most one should be incomplete
+ had_incomplete_match = (matchlen < 8);
+ if (bits < matchlen) return false; // Consuming bits past the end of the input
+ bits -= matchlen;
+ prevopcode = Instruction::MATCH;
+ } else if (opcode == Instruction::DEFAULT) {
+ if (prevopcode == Instruction::DEFAULT) return false; // There should not be two successive DEFAULTs (they could be combined into one)
+ uint32_t asn = DecodeASN(pos, endpos);
+ if (asn == INVALID) return false; // ASN straddles EOF
+ prevopcode = Instruction::DEFAULT;
+ } else {
+ return false; // Instruction straddles EOF
+ }
+ }
+ return false; // Reached EOF without RETURN instruction
+}
diff --git a/src/util/asmap.h b/src/util/asmap.h
index a0e14013c5..b31e639bb5 100644
--- a/src/util/asmap.h
+++ b/src/util/asmap.h
@@ -5,6 +5,11 @@
#ifndef BITCOIN_UTIL_ASMAP_H
#define BITCOIN_UTIL_ASMAP_H
+#include <stdint.h>
+#include <vector>
+
uint32_t Interpret(const std::vector<bool> &asmap, const std::vector<bool> &ip);
+bool SanityCheckASMap(const std::vector<bool>& asmap, int bits);
+
#endif // BITCOIN_UTIL_ASMAP_H
diff --git a/src/util/translation.h b/src/util/translation.h
index fc45da440a..b2d964c977 100644
--- a/src/util/translation.h
+++ b/src/util/translation.h
@@ -18,6 +18,20 @@ struct bilingual_str {
std::string translated;
};
+inline bilingual_str operator+(const bilingual_str& lhs, const bilingual_str& rhs)
+{
+ return bilingual_str{
+ lhs.original + rhs.original,
+ lhs.translated + rhs.translated};
+}
+
+/** Mark a bilingual_str as untranslated */
+inline static bilingual_str Untranslated(std::string original) { return {original, original}; }
+/** Unary operator to return the original */
+inline static std::string OpOriginal(const bilingual_str& b) { return b.original; }
+/** Unary operator to return the translation */
+inline static std::string OpTranslated(const bilingual_str& b) { return b.translated; }
+
namespace tinyformat {
template <typename... Args>
bilingual_str format(const bilingual_str& fmt, const Args&... args)
generated by cgit v1.2.3 (git 2.26.2) at 2024-10-30 07:35:35 +0000