[LTP] [LTP PATCH 0/2] ltp: fix af_alg02 to specify control data

[Petr Vorel]

Hi Eric,

> It isn't clearly defined what happens if you read from an AF_ALG request
> socket without previously sending the control data to begin an
> encryption or decryption operation.  On some kernels the read will
> return 0, while on others it will block.

> Testing this corner case isn't the purpose of af_alg02; it just wants to
> try to encrypt a zero-length message.  So, change it to explicitly send
> a zero-length message with control data.

> This fixes the test failure reported at
> https://lkml.kernel.org/r/CA+G9fYtebf78TH-XpqArunHc1L6s9mHdLEbpY1EY9tSyDjp=sg@mail.gmail.com

> Fixing the test in this way was also previously suggested at
> https://lkml.kernel.org/r/20200702033221.GA19367@gondor.apana.org.au

> Note, this patch doesn't change the fact that the read() still blocks on
> pre-4.14 kernels (which is a kernel bug), and thus the timeout logic in
> the test is still needed.

Thanks for the fix, merged!

Kind regards,
Petr