Question

我有一个使用OpenSSL的第三方库，我也使用Qt网络类来访问在https上运行的服务。

令人费解的是，当我使用专有库链接我的应用程序时，在调用QSslSocket期间，在属于OpenSSL的代码中会出现段错误。我需要做的就是将segfault与它链接起来，而不需要调用库中的任何函数。当我没有链接到库时，一切正常。

段错误看起来像这样

Program received signal SIGSEGV, Segmentation fault.
__strcmp_ssse3 () at ../sysdeps/x86_64/multiarch/../strcmp.S:209
209     ../sysdeps/x86_64/multiarch/../strcmp.S: No such file or directory.
(gdb) bt
#0  __strcmp_ssse3 () at ../sysdeps/x86_64/multiarch/../strcmp.S:209
#1  0x00007ffff72a4a5a in getrn () from /usr/lib64/libs63lib-5.16-dynr.so.10.0
#2  0x00007ffff72a4d90 in lh_insert () from /usr/lib64/libs63lib-5.16-dynr.so.10.0
#3  0x00007ffff72391fc in OBJ_NAME_add () from /usr/lib64/libs63lib-5.16-dynr.so.10.0
#4  0x00007ffff41ddba8 in SSL_library_init () from /lib/x86_64-linux-gnu/libssl.so.1.0.0
#5  0x00007ffff6b14b12 in ?? () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#6  0x00007ffff6b16de9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#7  0x00007ffff6b050b9 in QSslCertificate::QSslCertificate(QByteArray const&, QSsl::EncodingFormat) () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#8  0x00007ffff6b0f429 in ?? () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#9  0x00007ffff6b1760e in ?? () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#10 0x00007ffff6b1230f in QSslSocket::QSslSocket(QObject*) () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#11 0x0000000000404438 in main (argc=1, argv=0x7fffffffdb98) at s63seg.cpp:49

以下是来自strace的最后一行。

close(4)                                = 0
mprotect(0x7fbab8e95000, 110592, PROT_READ) = 0
munmap(0x7fbabc672000, 215488)          = 0
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=215488, ...}) = 0
mmap(NULL, 215488, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fbabc672000
close(4)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libssl.so.1.0.0", O_RDONLY|O_CLOEXEC) = 4
read(4, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20.\1\0\0\0\0\0"..., 832) = 832
fstat(4, {st_mode=S_IFREG|0644, st_size=382984, ...}) = 0
mmap(NULL, 2478288, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0x7fbab8887000
mprotect(0x7fbab88db000, 2097152, PROT_NONE) = 0
mmap(0x7fbab8adb000, 36864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x54000) = 0x7fbab8adb000
mmap(0x7fbab8ae4000, 208, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fbab8ae4000
close(4)                                = 0
mprotect(0x7fbab8adb000, 12288, PROT_READ) = 0
munmap(0x7fbabc672000, 215488)          = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0} ---

知道可能导致它的原因或我如何阻止它？当其他任何方法失败时，我可以将使用专有库的代码放在一个单独的可执行文件中，并使用system（）或类似的东西调用它，但这不是一个非常好的解决方案。

Answer 1

OpenSSL的两种用途是冲突的。您只能拥有CRYPTO_set_locking_callback()，CRYPTO_set_id和其他回调函数的一个实现。同一进程中的两个OpenSSL用户必须在这些方面进行合作。

链接第三方库会导致openssl中的段错误

1 个答案: