Thread: Avoid a NULL dereference after failed initialisation.

[openssl.git] / crypto / info.c

diff --git a/crypto/info.c b/crypto/info.c
index 5a929ddd037debc6b3188184d1ec6e649bea9abc..613ddc7d8c3bee544aab6ddb33a878f19c316e51 100644 (file)
--- a/crypto/info.c
+++ b/crypto/info.c
@@ -7,13 +7,121 @@
  * https://www.openssl.org/source/license.html
  */
 
-#include <stddef.h>
 #include <openssl/crypto.h>
-#include "internal/dso_conf.h"
+#include "crypto/dso_conf.h"
+#include "internal/thread_once.h"
+#include "internal/cryptlib.h"
 #include "e_os.h"
+#include "buildinf.h"
+
+#if defined(__arm__) || defined(__arm) || defined(__aarch64__)
+# include "arm_arch.h"
+#endif
+
+/* extern declaration to avoid warning */
+extern char ossl_cpu_info_str[];
+
+static char *seed_sources = NULL;
+
+char ossl_cpu_info_str[128] = "";
+#define CPUINFO_PREFIX "CPUINFO: "
+
+static CRYPTO_ONCE init_info = CRYPTO_ONCE_STATIC_INIT;
+
+DEFINE_RUN_ONCE_STATIC(init_info_strings)
+{
+#if defined(OPENSSL_CPUID_OBJ)
+# if defined(__i386)   || defined(__i386__)   || defined(_M_IX86) || \
+     defined(__x86_64) || defined(__x86_64__) || \
+     defined(_M_AMD64) || defined(_M_X64)
+    const char *env;
+
+    BIO_snprintf(ossl_cpu_info_str, sizeof(ossl_cpu_info_str),
+                 CPUINFO_PREFIX "OPENSSL_ia32cap=0x%llx:0x%llx",
+                 (long long)OPENSSL_ia32cap_P[0] |
+                 (long long)OPENSSL_ia32cap_P[1] << 32,
+                 (long long)OPENSSL_ia32cap_P[2] |
+                 (long long)OPENSSL_ia32cap_P[3] << 32);
+    if ((env = getenv("OPENSSL_ia32cap")) != NULL)
+        BIO_snprintf(ossl_cpu_info_str + strlen(ossl_cpu_info_str),
+                     sizeof(ossl_cpu_info_str) - strlen(ossl_cpu_info_str),
+                     " env:%s", env);
+# elif defined(__arm__) || defined(__arm) || defined(__aarch64__)
+    const char *env;
+
+    BIO_snprintf(ossl_cpu_info_str, sizeof(ossl_cpu_info_str),
+                 CPUINFO_PREFIX "OPENSSL_armcap=0x%x", OPENSSL_armcap_P);
+    if ((env = getenv("OPENSSL_armcap")) != NULL)
+        BIO_snprintf(ossl_cpu_info_str + strlen(ossl_cpu_info_str),
+                     sizeof(ossl_cpu_info_str) - strlen(ossl_cpu_info_str),
+                     " env:%s", env);
+# endif
+#endif
+
+    {
+        static char seeds[512] = "";
+
+#define add_seeds_string(str)                                           \
+        do {                                                            \
+            if (seeds[0] != '\0')                                       \
+                OPENSSL_strlcat(seeds, " ", sizeof(seeds));             \
+            OPENSSL_strlcat(seeds, str, sizeof(seeds));                 \
+        } while (0)
+#define add_seeds_stringlist(label, strlist)                            \
+        do {                                                            \
+            add_seeds_string(label "(");                                \
+            {                                                           \
+                const char *dev[] = strlist;                            \
+                int first = 1;                                          \
+                                                                        \
+                for (; *dev != NULL; dev++) {                           \
+                    if (!first)                                         \
+                        OPENSSL_strlcat(seeds, " ", sizeof(seeds));     \
+                    first = 0;                                          \
+                    OPENSSL_strlcat(seeds, *dev, sizeof(seeds));        \
+                }                                                       \
+            }                                                           \
+            OPENSSL_strlcat(seeds, ")", sizeof(seeds));                 \
+        } while (0)
+
+#ifdef OPENSSL_RAND_SEED_NONE
+        add_seeds_string("none");
+#endif
+#ifdef OPENSSL_RAND_SEED_RTDSC
+        add_seeds_string("stdsc");
+#endif
+#ifdef OPENSSL_RAND_SEED_RDCPU
+        add_seeds_string("rdrand ( rdseed rdrand )");
+#endif
+#ifdef OPENSSL_RAND_SEED_LIBRANDOM
+        add_seeds_string("C-library-random");
+#endif
+#ifdef OPENSSL_RAND_SEED_GETRANDOM
+        add_seeds_string("getrandom-syscall");
+#endif
+#ifdef OPENSSL_RAND_SEED_DEVRANDOM
+        add_seeds_stringlist("random-device", { DEVRANDOM, NULL });
+#endif
+#ifdef OPENSSL_RAND_SEED_EGD
+        add_seeds_stringlist("EGD", { DEVRANDOM_EGD, NULL });
+#endif
+#ifdef OPENSSL_RAND_SEED_OS
+        add_seeds_string("os-specific");
+#endif
+        seed_sources = seeds;
+    }
+    return 1;
+}
 
 const char *OPENSSL_info(int t)
 {
+    /*
+     * We don't care about the result.  Worst case scenario, the strings
+     * won't be initialised, i.e. remain NULL, which means that the info
+     * isn't available anyway...
+     */
+    (void)RUN_ONCE(&init_info, init_info_strings);
+
     switch (t) {
     case OPENSSL_INFO_CONFIG_DIR:
         return OPENSSLDIR;
@@ -36,6 +144,17 @@ const char *OPENSSL_info(int t)
             static const char list_sep[] = { LIST_SEPARATOR_CHAR, '\0' };
             return list_sep;
         }
+    case OPENSSL_INFO_SEED_SOURCE:
+        return seed_sources;
+    case OPENSSL_INFO_CPU_SETTINGS:
+        /*
+         * If successfully initialized, ossl_cpu_info_str will start
+         * with CPUINFO_PREFIX, if failed it will be an empty string.
+         * Strip away the CPUINFO_PREFIX which we don't need here.
+         */
+        if (ossl_cpu_info_str[0] != '\0')
+            return ossl_cpu_info_str + strlen(CPUINFO_PREFIX);
+        break;
     default:
         break;
     }