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Avoid possible SEGVs in select() (in unit tests)

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Per the POSIX definition of select():

http://pubs.opengroup.org/onlinepubs/009696699/functions/pselect.html

"Upon successful completion, the select() function may modify the object
pointed to by the timout argument."

If "struct timeval" pointer is a "static const", it could potentially
be allocated in a RO text segment.  The kernel would then try to copy
back the modified value (with the time remaining) into a read-only
address and SEGV.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
Closes: #614
This commit is contained in:
Philip Prindeville 2018-03-28 08:25:28 -06:00 committed by Azat Khuzhin
parent 4ba4873967
commit 33baa4e59f
1 changed files with 4 additions and 1 deletions
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5
evutil_time.c
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@ -141,7 +141,10 @@ evutil_usleep_(const struct timeval *tv)
sleep(tv->tv_sec);
usleep(tv->tv_usec);
#else
select(0, NULL, NULL, NULL, tv);
{
struct timeval tv2 = *tv;
select(0, NULL, NULL, NULL, &tv2);
}
#endif
}