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uefisign: fix handling of errors from child proc

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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 ...

Reviewed by:	trasz
MFC after:	1 week
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D29605
This commit is contained in:
Eric van Gyzen 2021-04-06 09:36:52 -05:00
parent 9857e00a52
commit 9e6158d274
1 changed files with 5 additions and 1 deletions
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6
usr.sbin/uefisign/uefisign.c
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@ -410,8 +410,12 @@ main(int argc, char **argv)
if (pid < 0)
err(1, "fork");
if (pid == 0)
if (pid == 0) {
close(pipefds[0]);
exit(child(inpath, outpath, pipefds[1], Vflag, vflag));
}
close(pipefds[1]);
if (!Vflag) {
certfp = checked_fopen(certpath, "r");