OpenSSL中的内存泄漏? [英] Memory leak in OpenSSL?
本文介绍了OpenSSL中的内存泄漏?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用以下代码检查签名.为简单起见，公钥，消息和签名在main中初始化.
I use the following code to check a signature. For simplicity public key, message and signature are initialized in main.
#include <openssl/sha.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/evp.h>
int main(){
const unsigned char key[] = "-----BEGIN PUBLIC KEY-----\n"
"MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALulMfYFyX1kSm7oUxZyCWWhrBBcWrRA\n"
"V7LSz1PzMPxoxG3KS8H7PRKFkIk42yM8/vhobmcCmj7UM5572wWch50CAwEAAQ==\n"
"-----END PUBLIC KEY-----\n";
unsigned int key_len = sizeof(key);
const unsigned char data[] = {0x6d,0x65,0x73,0x65,0x0a};
unsigned int data_len = sizeof(data);
const unsigned char sig[] = {0xa9,0x29,0x81,0x07,0x8c,0xeb,0xf0,0x1b,0x2a,0x31,0xe5,0x60,0x94,0x8a,0x47,0x94,0x3a,0x8f,0x6b,
0x4e,0x85,0xb9,0xe7,0xe5,0x4a,0x6c,0x56,0x46,0xd1,0x80,0x15,0x57,0xce,0xcb,0x0a,0x3a,0x67,0x15,0xed,
0x68,0x03,0x58,0x99,0xa4,0x73,0x61,0xe3,0x30,0x85,0xff,0x89,0x7e,0x32,0xef,0x16,0xec,0x23,0x7f,0x14,
0xde,0xbf,0x53,0xe0,0x3a};
unsigned int sig_len = sizeof(sig);
EVP_PKEY* evp_pubkey = EVP_PKEY_new();
RSA* rsa_pubkey = NULL;
EVP_MD_CTX ctx;
BIO* bufio = BIO_new_mem_buf((void*)key, key_len);
if(bufio == NULL){
fprintf(stderr, "BIO not created.\n");
EVP_PKEY_free(evp_pubkey);
BIO_free(bufio);
return 3;
}
evp_pubkey = PEM_read_bio_PUBKEY(bufio, NULL, NULL, NULL);
if(evp_pubkey == NULL){
fprintf(stderr, "evp_pubkey not created.\n");
EVP_PKEY_free(evp_pubkey);
BIO_free(bufio);
return 4;
}
EVP_MD_CTX_init(&ctx);
if (!EVP_VerifyInit(&ctx, EVP_sha256())) {
fprintf(stderr, "EVP_SignInit: failed.\n");
EVP_PKEY_free(evp_pubkey);
BIO_free(bufio);
return 5;
}
if (!EVP_VerifyUpdate(&ctx, data, data_len)) {
fprintf(stderr, "EVP_SignUpdate: failed.\n");
EVP_PKEY_free(evp_pubkey);
BIO_free(bufio);
return 6;
}
if (!EVP_VerifyFinal(&ctx, sig, sig_len, evp_pubkey)) {
fprintf(stderr, "EVP_VerifyFinal: failed.\n");
EVP_PKEY_free(evp_pubkey);
BIO_free(bufio);
return 7;
}
EVP_PKEY_free(evp_pubkey);
BIO_free(bufio);
return 0;
}
使用gcc evp.c -lssl -lcrypto编译并在其上运行valgrind --tool=memcheck --leak-check=full ./a.out后，我遇到了一些内存泄漏:
After compiling with gcc evp.c -lssl -lcrypto and running valgrind --tool=memcheck --leak-check=full ./a.out on it I get some memory leaks:
==7492== 56 bytes in 1 blocks are definitely lost in loss record 9 of 12
==7492== at 0x4C2BBCF: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7492== by 0x4E9AD77: CRYPTO_malloc (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==7492== by 0x4F5D459: EVP_PKEY_new (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==7492== by 0x400C4C: main (in a.out)
==7492==
==7492== 120 bytes in 1 blocks are definitely lost in loss record 10 of 12
==7492== at 0x4C2BBCF: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7492== by 0x4E9AD77: CRYPTO_malloc (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==7492== by 0x4F55678: EVP_DigestInit_ex (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==7492== by 0x400D6A: main (in a.out)
我做错什么了吗?
推荐答案
-
@ iharob 在您使用了
EVP_MD_CTX_init()，但没有释放使用EVP_MD_CTX_cleanup(&ctx)或-根据您的openssl版本-EVP_MD_CTX_free(&ctx)分配的数据.You used
EVP_MD_CTX_init()but did not free the data it allocated usingEVP_MD_CTX_cleanup(&ctx)or - depending on your openssl version -EVP_MD_CTX_free(&ctx).如果您使用调试信息进行编译(在gcc/clang中使用-g)，则 valgrind 会向您显示造成泄漏的源代码行.
And if you compile with debug info (using -g in gcc/clang) valgrind would show you the source code lines responsible for the leaks.
您也可以使用
EVP_MD_CTX_create()代替静态的EVP_MD_CTX.You could also use
EVP_MD_CTX_create()instead of using a staticEVP_MD_CTX.这是更新的代码:
#include <openssl/sha.h> #include <openssl/rsa.h> #include <openssl/pem.h> #include <openssl/evp.h> int main() { const unsigned char key[] = "-----BEGIN PUBLIC KEY-----\n" "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALulMfYFyX1kSm7oUxZyCWWhrBBcWrRA\n" "V7LSz1PzMPxoxG3KS8H7PRKFkIk42yM8/vhobmcCmj7UM5572wWch50CAwEAAQ==\n" "-----END PUBLIC KEY-----\n"; unsigned int key_len = sizeof(key) - 1; const unsigned char data[] = { 0x6d,0x65,0x73,0x65,0x0a }; unsigned int data_len = sizeof(data); const unsigned char sig[] = { 0xa9,0x29,0x81,0x07,0x8c,0xeb,0xf0,0x1b,0x2a,0x31,0xe5,0x60, 0x94,0x8a,0x47,0x94,0x3a,0x8f,0x6b,0x4e,0x85,0xb8,0xe7,0xe5, 0x4a,0x6c,0x56,0x46,0xd1,0x80,0x15,0x57,0xce,0xcb,0x0a,0x3a, 0x67,0x15,0xed,0x68,0x03,0x58,0x99,0xa4,0x73,0x61,0xe3,0x30, 0x85,0xff,0x89,0x7e,0x32,0xef,0x16,0xec,0x23,0x7f,0x14,0xde, 0xbf,0x53,0xe0,0x3a }; unsigned int sig_len = sizeof(sig); int ret = 0; EVP_PKEY* evp_pubkey = NULL; RSA* rsa_pubkey = NULL; EVP_MD_CTX* evp_ctx; BIO* bufio = NULL; if (!(bufio = BIO_new_mem_buf((void*)key, key_len))) { fprintf(stderr, "BIO not created.\n"); ret = 1; goto out; } if (!(evp_pubkey = PEM_read_bio_PUBKEY(bufio, NULL, NULL, NULL))) { fprintf(stderr, "evp_pubkey not created.\n"); ret = 2; goto out; } if (!(evp_ctx = EVP_MD_CTX_create())) { fprintf(stderr, "ctx not created.\n"); ret = 3; goto out; } if (!EVP_VerifyInit(evp_ctx, EVP_sha256())) { fprintf(stderr, "EVP_SignInit: failed.\n"); ret = 4; goto out; } if (!EVP_VerifyUpdate(evp_ctx, data, data_len)) { fprintf(stderr, "EVP_SignUpdate: failed.\n"); ret = 5; goto out; } if (!EVP_VerifyFinal(evp_ctx, sig, sig_len, evp_pubkey)) { fprintf(stderr, "EVP_VerifyFinal: failed.\n"); ret = 6; goto out; } out: if (evp_ctx) EVP_MD_CTX_destroy(evp_ctx); if (evp_pubkey) EVP_PKEY_free(evp_pubkey); if (bufio) BIO_free(bufio); return 0; }这篇关于OpenSSL中的内存泄漏?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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