CS5.3 - Prevent nested operations originating from outside contracts #231
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kevincheng96
commented
Oct 16, 2024
| oldCallback := tload(callbackSlot) | ||
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| // Prevent nested operations coming from an outside caller (i.e. not the Quark wallet itself) | ||
| if and(iszero(eq(oldActiveScript, 0)), iszero(eq(caller(), address()))) { |
Collaborator
Author
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We check against the activeScript here, but we really could also check against submissionToken since that is guaranteed to be non-zero during a nested operation. activeScript should also be non-zero during a nested operation since the zero address has empty code and will revert from the check above (L437).
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Embrace the YUL.
and(iszero(eq(oldActiveScript, 0)), iszero(eq(caller(), address())))
if ( ( oldActiveScript == 0 ) == FALSE ) AND ( ( msg.sender == address[this] ) == FALSE )
if oldActiveScript != 0 and msg.sender != address[this]
DeMorgan's Law:
unless (oldActiveScript == 0 or msg.sender == address[this]) {
revert()
}
My work through of the logic there.
Collaborator
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Correct, that logic checks out
kevincheng96
changed the title
hayesgm
approved these changes
Oct 16, 2024
| oldCallback := tload(callbackSlot) | ||
|
|
||
| // Prevent nested operations coming from an outside caller (i.e. not the Quark wallet itself) | ||
| if and(iszero(eq(oldActiveScript, 0)), iszero(eq(caller(), address()))) { |
Contributor
There was a problem hiding this comment.
Embrace the YUL.
and(iszero(eq(oldActiveScript, 0)), iszero(eq(caller(), address())))
if ( ( oldActiveScript == 0 ) == FALSE ) AND ( ( msg.sender == address[this] ) == FALSE )
if oldActiveScript != 0 and msg.sender != address[this]
DeMorgan's Law:
unless (oldActiveScript == 0 or msg.sender == address[this]) {
revert()
}
My work through of the logic there.
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This disallows contracts that are not the wallet itself from executing a nested Quark operation within the context of a parent Quark operation. This offers some protection for scripts that are making external calls. We still allow for nesting of Quark operations, with the caveat that the nested call must come from the Quark wallet itself.