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Revision 63ef0db60f7b9fc0c2bcabdc7e2bd133784ddd60 authored by Adam Langley on 13 December 2014, 20:13:10 UTC, committed by Matt Caswell on 16 December 2014, 14:46:57 UTC
Don't set client_version to the ServerHello version.
The client_version needs to be preserved for the RSA key exchange.

This change also means that renegotiation will, like TLS, repeat the old
client_version rather than advertise only the final version. (Either way,
version change on renego is not allowed.) This is necessary in TLS to work
around an SChannel bug, but it's not strictly necessary in DTLS.

(From BoringSSL)

Reviewed-by: Emilia Käsper <emilia@openssl.org>
(cherry picked from commit ec1af3c4195c1dfecdd9dc7458850ab1b8b951e0)
1 parent f74f5c8
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  • 47a4c1a
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  • crypto
  • /
  • armcap.c
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armcap.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <signal.h>
#include <crypto.h>

#include "arm_arch.h"

unsigned int OPENSSL_armcap_P;

static sigset_t all_masked;

static sigjmp_buf ill_jmp;
static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }

/*
 * Following subroutines could have been inlined, but it's not all
 * ARM compilers support inline assembler...
 */
void _armv7_neon_probe(void);
void _armv8_aes_probe(void);
void _armv8_sha1_probe(void);
void _armv8_sha256_probe(void);
void _armv8_pmull_probe(void);
unsigned long _armv7_tick(void);

unsigned long OPENSSL_rdtsc(void)
	{
	if (OPENSSL_armcap_P & ARMV7_TICK)
		return _armv7_tick();
	else
		return 0;
	}

/*
 * Use a weak reference to getauxval() so we can use it if it is available but
 * don't break the build if it is not.
 */
#if defined(__GNUC__) && __GNUC__>=2
void OPENSSL_cpuid_setup(void) __attribute__((constructor));
extern unsigned long getauxval(unsigned long type) __attribute__((weak));
#else
static unsigned long (*getauxval)(unsigned long) = NULL;
#endif

/*
 * ARM puts the the feature bits for Crypto Extensions in AT_HWCAP2, whereas
 * AArch64 used AT_HWCAP.
 */
#if defined(__arm__) || defined (__arm)
# define HWCAP			16	/* AT_HWCAP */
# define HWCAP_NEON		(1 << 12)

# define HWCAP_CE		26	/* AT_HWCAP2 */
# define HWCAP_CE_AES		(1 << 0)
# define HWCAP_CE_PMULL		(1 << 1)
# define HWCAP_CE_SHA1		(1 << 2)
# define HWCAP_CE_SHA256	(1 << 3)
#elif defined(__aarch64__)
# define HWCAP			16	/* AT_HWCAP */
# define HWCAP_NEON		(1 << 1)

# define HWCAP_CE		HWCAP
# define HWCAP_CE_AES		(1 << 3)
# define HWCAP_CE_PMULL		(1 << 4)
# define HWCAP_CE_SHA1		(1 << 5)
# define HWCAP_CE_SHA256	(1 << 6)
#endif

void OPENSSL_cpuid_setup(void)
	{
	char *e;
	struct sigaction	ill_oact,ill_act;
	sigset_t		oset;
	static int trigger=0;

	if (trigger) return;
	trigger=1;
 
	if ((e=getenv("OPENSSL_armcap")))
		{
		OPENSSL_armcap_P=(unsigned int)strtoul(e,NULL,0);
		return;
		}

	sigfillset(&all_masked);
	sigdelset(&all_masked,SIGILL);
	sigdelset(&all_masked,SIGTRAP);
	sigdelset(&all_masked,SIGFPE);
	sigdelset(&all_masked,SIGBUS);
	sigdelset(&all_masked,SIGSEGV);

	OPENSSL_armcap_P = 0;

	memset(&ill_act,0,sizeof(ill_act));
	ill_act.sa_handler = ill_handler;
	ill_act.sa_mask    = all_masked;

	sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
	sigaction(SIGILL,&ill_act,&ill_oact);

	if (getauxval != NULL)
		{
		if (getauxval(HWCAP) & HWCAP_NEON)
			{
			unsigned long hwcap = getauxval(HWCAP_CE);

			OPENSSL_armcap_P |= ARMV7_NEON;

			if (hwcap & HWCAP_CE_AES)
				OPENSSL_armcap_P |= ARMV8_AES;

			if (hwcap & HWCAP_CE_PMULL)
				OPENSSL_armcap_P |= ARMV8_PMULL;

			if (hwcap & HWCAP_CE_SHA1)
				OPENSSL_armcap_P |= ARMV8_SHA1;

			if (hwcap & HWCAP_CE_SHA256)
				OPENSSL_armcap_P |= ARMV8_SHA256;
			}
		}
	else if (sigsetjmp(ill_jmp,1) == 0)
		{
		_armv7_neon_probe();
		OPENSSL_armcap_P |= ARMV7_NEON;
		if (sigsetjmp(ill_jmp,1) == 0)
			{
			_armv8_pmull_probe();
			OPENSSL_armcap_P |= ARMV8_PMULL|ARMV8_AES;
			}
		else if (sigsetjmp(ill_jmp,1) == 0)
			{
			_armv8_aes_probe();
			OPENSSL_armcap_P |= ARMV8_AES;
			}
		if (sigsetjmp(ill_jmp,1) == 0)
			{
			_armv8_sha1_probe();
			OPENSSL_armcap_P |= ARMV8_SHA1;
			}
		if (sigsetjmp(ill_jmp,1) == 0)
			{
			_armv8_sha256_probe();
			OPENSSL_armcap_P |= ARMV8_SHA256;
			}
		}
	if (sigsetjmp(ill_jmp,1) == 0)
		{
		_armv7_tick();
		OPENSSL_armcap_P |= ARMV7_TICK;
		}

	sigaction (SIGILL,&ill_oact,NULL);
	sigprocmask(SIG_SETMASK,&oset,NULL);
	}
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