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Overflow if co_exceptiontable is absurdly large #126858

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federicovalenso opened this issue Nov 15, 2024 · 3 comments
Closed

Overflow if co_exceptiontable is absurdly large #126858

federicovalenso opened this issue Nov 15, 2024 · 3 comments
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@picnixz
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3.12 bugs and security fixes 3.13 bugs and security fixes 3.14 new features, bugs and security fixes interpreter-core (Objects, Python, Grammar, and Parser dirs) type-bug An unexpected behavior, bug, or error

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@federicovalenso
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federicovalenso commented Nov 15, 2024 •
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Bug report

Bug description:

f.__code__ = f.__code__.replace(co_linetable=bytes(bytearray(2**31+1)))

It can lead to overflow in assemble.c

CPython versions tested on:

3.11

Operating systems tested on:

Linux
@federicovalenso federicovalenso added the type-bug An unexpected behavior, bug, or error label Nov 15, 2024
@picnixz picnixz self-assigned this Nov 15, 2024
@picnixz picnixz added interpreter-core (Objects, Python, Grammar, and Parser dirs) 3.12 bugs and security fixes 3.13 bugs and security fixes 3.14 new features, bugs and security fixes labels Nov 15, 2024
@picnixz picnixz changed the title Overflow if co_exceptiontable is absurdly large Overflow if a_except_table is absurdly large Nov 15, 2024
@picnixz picnixz changed the title Overflow if a_except_table is absurdly large Overflow if co_exceptiontable is absurdly large Nov 15, 2024
@picnixz
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picnixz commented Nov 15, 2024 •
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Actually, how is co_exceptiontable related to a_except_table? Namely, can you write me a complete PoC please?

@picnixz picnixz added the pending The issue will be closed if no feedback is provided label Nov 15, 2024
@ZeroIntensity
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This one doesn't seem like it's worth fixing, there's plenty of ways to crash the interpreter by messing with code objects.

@skirpichev skirpichev mentioned this issue Nov 20, 2024
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@github-actions github-actions bot mentioned this issue Dec 1, 2024
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@picnixz
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picnixz commented Dec 2, 2024

I think I'll close this one unless you can find me a simple reproducer.

@picnixz picnixz closed this as not planned Won't fix, can't repro, duplicate, stale Dec 2, 2024
@picnixz picnixz removed the pending The issue will be closed if no feedback is provided label Dec 2, 2024
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3.12 bugs and security fixes 3.13 bugs and security fixes 3.14 new features, bugs and security fixes interpreter-core (Objects, Python, Grammar, and Parser dirs) type-bug An unexpected behavior, bug, or error
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@picnixz @federicovalenso @ZeroIntensity