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capsicum_helpers: Squash errors from closed fds

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Squash EBADF from closed stdin, stdout, or stderr in caph_limit_stdio().
Any program used during special shell scripts may commonly be forked
from a parent process with closed standard stream.  Do the common sense
thing for this common use.

Reported by:	Iblis Lin <iblis AT hs.ntnu.edu.tw>
Reviewed by:	oshogbo@ (earlier version)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D8657
This commit is contained in:
cem 2016-12-01 17:28:45 +00:00
parent 93bd5b27d2
commit db70589489
1 changed files with 4 additions and 4 deletions
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8
lib/libcapsicum/capsicum_helpers.h
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@ -94,12 +94,12 @@ caph_limit_stdout(void)
static __inline int
caph_limit_stdio(void)
{
const int iebadf = CAPH_IGNORE_EBADF;
if (caph_limit_stdin() == -1 || caph_limit_stdout() == -1 ||
caph_limit_stderr() == -1) {
if (caph_limit_stream(STDIN_FILENO, CAPH_READ | iebadf) == -1 ||
caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | iebadf) == -1 ||
caph_limit_stream(STDERR_FILENO, CAPH_WRITE | iebadf) == -1)
return (-1);
}
return (0);
}