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This commit is contained in:
Daniel Kirchner 2022-06-14 17:30:14 +02:00
parent 91ff02b988
commit 187f0f070d
2 changed files with 25 additions and 25 deletions
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2
docs/bugs.json
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@ -3,7 +3,7 @@
"uid": "SOL-2022-5",
"name": "DirtyBytesArrayToStorage",
"summary": "Copying ``bytes`` arrays from memory or calldata to storage may result in dirty storage values.",
"description": "Copying ``bytes`` arrays from memory or calldata to storage is done in chunks of 32 bytes. Thereby, dirty values in calldata or memory can be written to storage, which may then become observable after a ``.push()`` on the bytes array in storage.",
"description": "Copying ``bytes`` arrays from memory or calldata to storage is done in chunks of 32 bytes even if the length is not a multiple of 32. Thereby, extra bytes past the end of the array may be copied from calldata or memory to storage. These dirty bytes may then become observable after a ``.push()`` without arguments to the bytes array in storage, i.e. such a push will not result in a zero value at the end of the array as expected. This bug only affects the legacy code generation pipeline, the new code generation pipeline via IR is not affected.",
"link": "https://blog.soliditylang.org/2022/06/15/dirty-bytes-array-to-storage-bug/",
"introduced": "0.0.1",
"fixed": "0.8.15",

26
test/libsolidity/semanticTests/byte_array_to_storage_cleanup.sol
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@ -1,27 +1,27 @@
contract C {
event ev0(uint[] i0, uint);
bytes public s2;
event ev(uint[], uint);
bytes public s;
function h() external returns (bytes memory) {
uint[] memory x = new uint[](2);
emit ev0(x, 0x21);
emit ev(x, 0x21);
bytes memory m = new bytes(63);
s2 = m;
s2.push();
return s2;
s = m;
s.push();
return s;
}
function g() external returns (bytes memory) {
bytes memory m = new bytes(63);
assembly {
mstore8(add(m, add(32, 63)), 0x42)
}
s2 = m;
s2.push();
return s2;
s = m;
s.push();
return s;
}
function f(bytes calldata c) external returns (bytes memory) {
s2 = c;
s2.push();
return s2;
s = c;
s.push();
return s;
}
}
// ====
@ -32,6 +32,6 @@ contract C {
// gas legacy: 731840
// gas legacyOptimized: 494859
// h() -> 0x20, 0x40, 0x00, 0
// ~ emit ev0(uint256[],uint256): 0x40, 0x21, 0x02, 0x00, 0x00
// ~ emit ev(uint256[],uint256): 0x40, 0x21, 0x02, 0x00, 0x00
// g() -> 0x20, 0x40, 0, 0x00
// f(bytes): 0x20, 33, 0, -1 -> 0x20, 0x22, 0, 0xff00000000000000000000000000000000000000000000000000000000000000