diff options
| author | Andy Polyakov <appro@openssl.org> | 2017-08-31 01:09:48 +0200 |
|---|---|---|
| committer | Andy Polyakov <appro@openssl.org> | 2017-09-01 08:48:32 +0200 |
| commit | 6e5a853bda24e8aece325ecf5aa68b8ea832e414 (patch) | |
| tree | 270c82691b064492838700aff24933c2c44f7aed /crypto/cryptlib.c | |
| parent | 89bc9cf682e833d44fe135c901fe75f600d871ef (diff) | |
| download | openssl-6e5a853bda24e8aece325ecf5aa68b8ea832e414.tar.gz | |
crypto/cryptlib.c: mask more capability bits upon FXSR bit flip.
OPENSSL_ia32cap.pod discusses possibility to disable operations on
XMM register bank. This formally means that this flag has to be checked
in combination with other flags. But it customarily isn't. But instead
of chasing all the cases we can flip more bits together with FXSR one.
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4303)
Diffstat (limited to 'crypto/cryptlib.c')
| -rw-r--r-- | crypto/cryptlib.c | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/crypto/cryptlib.c b/crypto/cryptlib.c index 6e45b0d8ba..eb24b27808 100644 --- a/crypto/cryptlib.c +++ b/crypto/cryptlib.c @@ -42,12 +42,24 @@ void OPENSSL_cpuid_setup(void) if (!sscanf(env + off, "%lli", (long long *)&vec)) vec = strtoul(env + off, NULL, 0); # endif - if (off) - vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P) & ~vec; - else if (env[0] == ':') + if (off) { + IA32CAP mask = vec; + vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P) & ~mask; + if (mask & (1<<24)) { + /* + * User disables FXSR bit, mask even other capabilities + * that operate exclusively on XMM, so we don't have to + * double-check all the time. We mask PCLMULQDQ, AMD XOP, + * AES-NI and AVX. Formally speaking we don't have to + * do it in x86_64 case, but we can safely assume that + * x86_64 users won't actually flip this flag. + */ + vec &= ~((IA32CAP)(1<<1|1<<11|1<<25|1<<28) << 32); + } + } else if (env[0] == ':') { vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P); + } - OPENSSL_ia32cap_P[2] = 0; if ((env = strchr(env, ':'))) { unsigned int vecx; env++; @@ -57,9 +69,12 @@ void OPENSSL_cpuid_setup(void) OPENSSL_ia32cap_P[2] &= ~vecx; else OPENSSL_ia32cap_P[2] = vecx; + } else { + OPENSSL_ia32cap_P[2] = 0; } - } else + } else { vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P); + } /* * |(1<<10) sets a reserved bit to signal that variable |