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syscall_random(): don't fail if the getentropy() function is a dummy

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Several embedded toolchains may provide dummy implemented getentropy()
function which always returns -1 and sets errno to the ENOSYS.

As a result the function SSL_CTX_new() fails to create a new context.

Fixes #13002

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/13114)
This commit is contained in:
Yury Is 2020-10-13 02:24:52 +03:00 committed by Dr. Matthias St. Pierre
parent 58608c7c7a
commit 8e596a93bc
1 changed files with 9 additions and 2 deletions
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11
providers/implementations/rands/seeding/rand_unix.c
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@ -376,12 +376,19 @@ static ssize_t syscall_random(void *buf, size_t buflen)
* - OpenBSD since 5.6
* - Linux since 3.17 with glibc 2.25
* - FreeBSD since 12.0 (1200061)
*
* Note: Sometimes getentropy() can be provided but not implemented
* internally. So we need to check errno for ENOSYS
*/
# if defined(__GNUC__) && __GNUC__>=2 && defined(__ELF__) && !defined(__hpux)
extern int getentropy(void *buffer, size_t length) __attribute__((weak));
if (getentropy != NULL)
return getentropy(buf, buflen) == 0 ? (ssize_t)buflen : -1;
if (getentropy != NULL) {
if (getentropy(buf, buflen) == 0)
return (ssize_t)buflen;
if (errno != ENOSYS)
return -1;
}
# elif !defined(FIPS_MODULE)
union {
void *p;