sshd blocks SIGALRM

[Damien Miller]

Loic Domaigne wrote:
> After some non trivial investigations, we found out that SIGALRM was blocked
> in the signal set of the remote shell we were using, and hence in our
> command since the signal mask is inherited accross fork()/exec(). 

I don't think it makes any sense to inherit a custom SIGALRM handler
across exec(). That sounds like an OS bug.

Anyway, try the attached patch.

-d
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