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linux(4): Prevent an endless loop.

Description

linux(4): Prevent an endless loop.

In the futex_atomic_op() the encoded_op is a user-supplied parameter.
If the user specifies an incorrect value for this parameter paired with a valid
*uaddr parameter the caller will go into the endless loop. To prevent this check
futex_atomic_op() result and break the loop in case of ENOSYS.

MFC after: 2 weeks

Details

Provenance
dchaginAuthored on Jul 20 2021, 11:40 AM
Parents
R10:80b8d6b144c2: linux(4): Eliminate bogus comment.
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