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uefisign: fix handling of errors from child proc

Authored by vangyzen on Apr 6 2021, 2:53 PM.



Close the unused pipe file descriptors so the parent will notice if
the child exits prematurely. Previously, the parent would block
forever on a read from the pipe.

$ uefisign -c foo.cert -k foo.key -o loader.efi loader.efi.unsigned
uefisign: section points inside the headers
load: 0.06  cmd: uefisign 4502 [piperd] 7.25r 0.00u 0.00s 0% 5968k
... _sleep+0x1be pipe_read+0x3d6 kern_readv+0x8c sys_read+0x83 ...

Sponsored by: Dell EMC Isilon
MFC after: 1 week

Test Plan

It exits immediately in the above error case.

Diff Detail

rG FreeBSD src repository
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.