On Tue, Jun 02, 2020 at 09:00:51PM +0300, Dmitry V. Levin wrote:
> If both the tracer and the tracee are compat processes, and gprs[2]
> is assigned a value by __poke_user_compat, then the higher 32 bits
> of gprs[2] are cleared, IS_ERR_VALUE() always returns false, and
> syscall_get_error() always
If both the tracer and the tracee are compat processes, and gprs[2]
is assigned a value by __poke_user_compat, then the higher 32 bits
of gprs[2] are cleared, IS_ERR_VALUE() always returns false, and
syscall_get_error() always returns 0.
Fix the implementation by sign-extending the value for compa
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