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Avoid overflowing FDSET when using select(2).

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There is a problem in the rand_unix.c code when the random seed fd is greater
than or equal to FD_SETSIZE and the FDSET overruns its limit and walks the
stack.

Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from https://github.com/openssl/openssl/pull/9686)
This commit is contained in:
Pauli 2019-08-24 16:13:24 +10:00
parent f42c225d7f
commit e1f8584d47
1 changed files with 1 additions and 1 deletions
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2
crypto/rand/rand_unix.c
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@ -390,7 +390,7 @@ static int wait_random_seeded(void)
}
/* Open /dev/random and wait for it to be readable */
if ((fd = open(DEVRANDOM_WAIT, O_RDONLY)) != -1) {
if (DEVRANDM_WAIT_USE_SELECT) {
if (DEVRANDM_WAIT_USE_SELECT && fd < FD_SETSIZE) {
FD_ZERO(&fds);
FD_SET(fd, &fds);
while ((r = select(fd + 1, &fds, NULL, NULL, NULL)) < 0