diff options
Diffstat (limited to 'contrib/unbound/compat/getentropy_linux.c')
| -rw-r--r-- | contrib/unbound/compat/getentropy_linux.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/contrib/unbound/compat/getentropy_linux.c b/contrib/unbound/compat/getentropy_linux.c index d4adab2..76f0f9d 100644 --- a/contrib/unbound/compat/getentropy_linux.c +++ b/contrib/unbound/compat/getentropy_linux.c @@ -77,6 +77,9 @@ int getentropy(void *buf, size_t len); extern int main(int, char *argv[]); #endif static int gotdata(char *buf, size_t len); +#ifdef SYS_getrandom +static int getentropy_getrandom(void *buf, size_t len); +#endif static int getentropy_urandom(void *buf, size_t len); #ifdef SYS__sysctl static int getentropy_sysctl(void *buf, size_t len); @@ -94,11 +97,15 @@ getentropy(void *buf, size_t len) } #ifdef SYS_getrandom - /* try to use getrandom syscall introduced with kernel 3.17 */ - ret = syscall(SYS_getrandom, buf, len, 0); + /* + * Try descriptor-less getrandom() + */ + ret = getentropy_getrandom(buf, len); if (ret != -1) return (ret); -#endif /* SYS_getrandom */ + if (errno != ENOSYS) + return (-1); +#endif /* * Try to get entropy with /dev/urandom @@ -185,6 +192,25 @@ gotdata(char *buf, size_t len) return 0; } +#ifdef SYS_getrandom +static int +getentropy_getrandom(void *buf, size_t len) +{ + int pre_errno = errno; + int ret; + if (len > 256) + return (-1); + do { + ret = syscall(SYS_getrandom, buf, len, 0); + } while (ret == -1 && errno == EINTR); + + if (ret != (int)len) + return (-1); + errno = pre_errno; + return (0); +} +#endif + static int getentropy_urandom(void *buf, size_t len) { @@ -258,7 +284,7 @@ getentropy_sysctl(void *buf, size_t len) struct __sysctl_args args = { .name = mib, .nlen = 3, - .oldval = buf + i, + .oldval = (char *)buf + i, .oldlenp = &chunk, }; if (syscall(SYS__sysctl, &args) != 0) |
