diff options
Diffstat (limited to 'external/unbound/compat/getentropy_linux.c')
| -rw-r--r-- | external/unbound/compat/getentropy_linux.c | 49 |
1 files changed, 42 insertions, 7 deletions
diff --git a/external/unbound/compat/getentropy_linux.c b/external/unbound/compat/getentropy_linux.c index 32d58a7cd..76f0f9df5 100644 --- a/external/unbound/compat/getentropy_linux.c +++ b/external/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); @@ -93,6 +96,17 @@ getentropy(void *buf, size_t len) return -1; } +#ifdef SYS_getrandom + /* + * Try descriptor-less getrandom() + */ + ret = getentropy_getrandom(buf, len); + if (ret != -1) + return (ret); + if (errno != ENOSYS) + return (-1); +#endif + /* * Try to get entropy with /dev/urandom * @@ -178,6 +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) { @@ -251,7 +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) @@ -474,22 +507,24 @@ getentropy_fallback(void *buf, size_t len) HD(cnt); } -#ifdef AT_RANDOM +#ifdef HAVE_GETAUXVAL +# ifdef AT_RANDOM /* Not as random as you think but we take what we are given */ p = (char *) getauxval(AT_RANDOM); if (p) HR(p, 16); -#endif -#ifdef AT_SYSINFO_EHDR +# endif +# ifdef AT_SYSINFO_EHDR p = (char *) getauxval(AT_SYSINFO_EHDR); if (p) HR(p, pgs); -#endif -#ifdef AT_BASE +# endif +# ifdef AT_BASE p = (char *) getauxval(AT_BASE); if (p) HD(p); -#endif +# endif +#endif /* HAVE_GETAUXVAL */ SHA512_Final(results, &ctx); memcpy((char*)buf + i, results, min(sizeof(results), len - i)); |