All,
My program building with SSL library run ok under debug mode,But dump under
release build when produce PRNG.Using the Purify integration, it report that DUMP when
calling RAND_screen().
When I use the Purify to check the memory leak of my SSL project,which in
debug build,once I call RAND_screen() to generate PRNG(same like s_server.c).The
purify report errors like below:
--------------------------------------------------------------------------
[W] PAR: UnmapViewOfFile(0x3120001) arg #1 (lpBaseAddress) not identical to value
returned by MapViewOfFile (3120000) {1 occurrence}
Call location
UnmapViewOfFile [KERNEL32.dll]
DllUnregisterServer [rsaenh.dll]
DllUnregisterServer [rsaenh.dll]
CPReleaseContext [rsaenh.dll]
DllUnregisterServer [rsaenh.dll]
RtlCharToInteger [ntdll.dll]
RtlCharToInteger [ntdll.dll]
LdrLoadDll [ntdll.dll]
LoadLibraryExA [KERNEL32.dll]
LoadLibraryA [KERNEL32.dll]
CryptAcquireContextA [advapi32.dll]
RAND_poll [LIBEAY32.dll]
app_RAND_load_file [app_rand.c:133]
#ifdef WINDOWS
BIO_printf(bio_e,"Loading 'screen' into random state -");
BIO_flush(bio_e);
=> RAND_screen();
BIO_printf(bio_e," done\n");
#endif
InitSSL [gextern.cpp:1130]
if(WinSocket_init() <0) {
return -2;
}
=> if (!app_RAND_load_file(NULL, bio_err, 1) && !RAND_status()){
fprintf(stderr,"warning, not much extra random data,
consider using the -rand option\n");
goto err;
}
main [main.cpp:120]
--------------------------------------------------------------------------
I see the problem is RAND_screen().So my first question is whether SSL only using
in debug build,and the purify tool is right? Can anyone help me about it ?
Another,I have read lot of problem about memory leak in openssl-users forum. I
think I had comply some experienced
conduct ,such as noticing session cache mode,call some free function like
ERR_remove_state(0),SSL_CTX_flush_sessions(ctx,time(NULL)) when end the SSL session.
When debug in Solaris ,the memory states show that, after successed
handshaking and data packet delivering continued dozens times, the heap occupancy
grows 8k regular when create a new handshake. And the test application act as SSL
client, session cache mode is OFF, a new handshake used a new SSL_CTX freed it when
end. My application code have been checked with Boundschecker tool. I am bewildered
with what happened.
#top
PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND
2275 root 5 48 0 2944K 2064K sleep 6:46 0.12% pa
#memlook
PID IMAGE RSS HEAP STACK
2275 3014656 2113536 262696 40960
Thanks.
Stevens.Wang
[EMAIL PROTECTED]
2002-03-14
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