mirror of
https://github.com/DrKLO/Telegram.git
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201 lines
6.6 KiB
C
201 lines
6.6 KiB
C
/* Copyright (c) 2018, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#ifndef OPENSSL_HEADER_CRYPTO_CPU_ARM_LINUX_H
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#define OPENSSL_HEADER_CRYPTO_CPU_ARM_LINUX_H
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#include <openssl/base.h>
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#include <string.h>
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#include "internal.h"
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#if defined(__cplusplus)
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extern "C" {
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#endif
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// The cpuinfo parser lives in a header file so it may be accessible from
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// cross-platform fuzzers without adding code to those platforms normally.
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#define HWCAP_NEON (1 << 12)
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// See /usr/include/asm/hwcap.h on an ARM installation for the source of
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// these values.
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#define HWCAP2_AES (1 << 0)
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#define HWCAP2_PMULL (1 << 1)
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#define HWCAP2_SHA1 (1 << 2)
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#define HWCAP2_SHA2 (1 << 3)
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typedef struct {
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const char *data;
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size_t len;
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} STRING_PIECE;
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static int STRING_PIECE_equals(const STRING_PIECE *a, const char *b) {
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size_t b_len = strlen(b);
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return a->len == b_len && OPENSSL_memcmp(a->data, b, b_len) == 0;
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}
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// STRING_PIECE_split finds the first occurence of |sep| in |in| and, if found,
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// sets |*out_left| and |*out_right| to |in| split before and after it. It
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// returns one if |sep| was found and zero otherwise.
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static int STRING_PIECE_split(STRING_PIECE *out_left, STRING_PIECE *out_right,
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const STRING_PIECE *in, char sep) {
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const char *p = (const char *)OPENSSL_memchr(in->data, sep, in->len);
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if (p == NULL) {
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return 0;
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}
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// |out_left| or |out_right| may alias |in|, so make a copy.
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STRING_PIECE in_copy = *in;
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out_left->data = in_copy.data;
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out_left->len = p - in_copy.data;
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out_right->data = in_copy.data + out_left->len + 1;
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out_right->len = in_copy.len - out_left->len - 1;
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return 1;
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}
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// STRING_PIECE_get_delimited reads a |sep|-delimited entry from |s|, writing it
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// to |out| and updating |s| to point beyond it. It returns one on success and
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// zero if |s| is empty. If |s| is has no copies of |sep| and is non-empty, it
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// reads the entire string to |out|.
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static int STRING_PIECE_get_delimited(STRING_PIECE *s, STRING_PIECE *out, char sep) {
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if (s->len == 0) {
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return 0;
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}
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if (!STRING_PIECE_split(out, s, s, sep)) {
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// |s| had no instances of |sep|. Return the entire string.
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*out = *s;
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s->data += s->len;
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s->len = 0;
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}
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return 1;
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}
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// STRING_PIECE_trim removes leading and trailing whitespace from |s|.
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static void STRING_PIECE_trim(STRING_PIECE *s) {
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while (s->len != 0 && (s->data[0] == ' ' || s->data[0] == '\t')) {
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s->data++;
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s->len--;
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}
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while (s->len != 0 &&
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(s->data[s->len - 1] == ' ' || s->data[s->len - 1] == '\t')) {
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s->len--;
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}
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}
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// extract_cpuinfo_field extracts a /proc/cpuinfo field named |field| from
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// |in|. If found, it sets |*out| to the value and returns one. Otherwise, it
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// returns zero.
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static int extract_cpuinfo_field(STRING_PIECE *out, const STRING_PIECE *in,
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const char *field) {
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// Process |in| one line at a time.
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STRING_PIECE remaining = *in, line;
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while (STRING_PIECE_get_delimited(&remaining, &line, '\n')) {
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STRING_PIECE key, value;
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if (!STRING_PIECE_split(&key, &value, &line, ':')) {
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continue;
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}
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STRING_PIECE_trim(&key);
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if (STRING_PIECE_equals(&key, field)) {
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STRING_PIECE_trim(&value);
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*out = value;
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return 1;
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}
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}
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return 0;
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}
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static int cpuinfo_field_equals(const STRING_PIECE *cpuinfo, const char *field,
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const char *value) {
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STRING_PIECE extracted;
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return extract_cpuinfo_field(&extracted, cpuinfo, field) &&
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STRING_PIECE_equals(&extracted, value);
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}
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// has_list_item treats |list| as a space-separated list of items and returns
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// one if |item| is contained in |list| and zero otherwise.
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static int has_list_item(const STRING_PIECE *list, const char *item) {
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STRING_PIECE remaining = *list, feature;
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while (STRING_PIECE_get_delimited(&remaining, &feature, ' ')) {
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if (STRING_PIECE_equals(&feature, item)) {
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return 1;
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}
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}
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return 0;
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}
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// crypto_get_arm_hwcap_from_cpuinfo returns an equivalent ARM |AT_HWCAP| value
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// from |cpuinfo|.
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static unsigned long crypto_get_arm_hwcap_from_cpuinfo(
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const STRING_PIECE *cpuinfo) {
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if (cpuinfo_field_equals(cpuinfo, "CPU architecture", "8")) {
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// This is a 32-bit ARM binary running on a 64-bit kernel. NEON is always
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// available on ARMv8. Linux omits required features, so reading the
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// "Features" line does not work. (For simplicity, use strict equality. We
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// assume everything running on future ARM architectures will have a
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// working |getauxval|.)
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return HWCAP_NEON;
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}
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STRING_PIECE features;
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if (extract_cpuinfo_field(&features, cpuinfo, "Features") &&
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has_list_item(&features, "neon")) {
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return HWCAP_NEON;
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}
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return 0;
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}
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// crypto_get_arm_hwcap2_from_cpuinfo returns an equivalent ARM |AT_HWCAP2|
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// value from |cpuinfo|.
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static unsigned long crypto_get_arm_hwcap2_from_cpuinfo(
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const STRING_PIECE *cpuinfo) {
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STRING_PIECE features;
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if (!extract_cpuinfo_field(&features, cpuinfo, "Features")) {
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return 0;
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}
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unsigned long ret = 0;
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if (has_list_item(&features, "aes")) {
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ret |= HWCAP2_AES;
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}
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if (has_list_item(&features, "pmull")) {
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ret |= HWCAP2_PMULL;
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}
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if (has_list_item(&features, "sha1")) {
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ret |= HWCAP2_SHA1;
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}
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if (has_list_item(&features, "sha2")) {
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ret |= HWCAP2_SHA2;
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}
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return ret;
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}
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// crypto_cpuinfo_has_broken_neon returns one if |cpuinfo| matches a CPU known
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// to have broken NEON unit and zero otherwise. See https://crbug.com/341598.
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static int crypto_cpuinfo_has_broken_neon(const STRING_PIECE *cpuinfo) {
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return cpuinfo_field_equals(cpuinfo, "CPU implementer", "0x51") &&
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cpuinfo_field_equals(cpuinfo, "CPU architecture", "7") &&
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cpuinfo_field_equals(cpuinfo, "CPU variant", "0x1") &&
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cpuinfo_field_equals(cpuinfo, "CPU part", "0x04d") &&
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cpuinfo_field_equals(cpuinfo, "CPU revision", "0");
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}
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#if defined(__cplusplus)
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} // extern C
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#endif
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#endif // OPENSSL_HEADER_CRYPTO_CPU_ARM_LINUX_H
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