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Fuzzer manages to open it and do bad things with it.
Prevent it from doing so.
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This ability was never used but we maintain a bunch of code for it.
syzkaller also recently learned to spoof this error code
with some ptrace magic (probably intercepted control flow again
and exploited executor binary).
Drop all of it.
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Add bulk of checks for strict parsing mode.
Probably not complete, but we can extend then in future as needed.
Turns out we can't easily use it for serialized programs
as they omit default args and during deserialization it looks like missing args.
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Over time we relaxed parsing to handle all kinds of invalid programs
(excessive/missing args, wrong types, etc).
This is useful when reading old programs from corpus.
But this is harmful for e.g. reading test inputs as they can become arbitrary outdated.
For runtests which creates additional problem of executing not
what is actually written in the test (or at least what author meant).
Add strict parsing mode that does not tolerate any errors.
For now it just checks excessive syscall arguments.
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FAN_OPEN_PERM and FAN_ACCESS_PERM require the program to reply to open requests.
If that does not happen, the program will hang in an unkillable state forever.
See the following bug for details:
https://groups.google.com/d/msg/syzkaller-bugs/pD-vbqJu6U0/kGH30p3lBgAJ
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