I'm getting a crash in sha1_block_data_order_ssse3() but currently
I don't know how to debug this further as I'm not very familiar
with the internals... Any suggestions for tracking this down are
appreciated, e.g., is it something in the application or in OpenSSL?
The problem is 100% reproducible in this application (SMTP server)
but it doesn't happen in others (e.g., sendmail 8) using the same
OpenSSL setup. I found some other instances of this crash online
but seemingly without conclusion what's actually wrong.
Here's some information:
$ openssl version -a
OpenSSL 1.0.1e 11 Feb 2013
built on: Fri Dec 13 06:33:28 PST 2013
platform: debug-BSD-x86_64
options: bn(64,64) rc4(16x,int) des(idx,cisc,16,int) idea(int) blowfish(idx)
compiler: gcc -DOPENSSL_THREADS -pthread -D_THREAD_SAFE -D_REENTRANT
-DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -DTERMIOS -g -Wall -DOPENSSL_IA32_SSE2
-DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM
-DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM
-DWHIRLPOOL_ASM -DGHASH_ASM
OPENSSLDIR: "/home/ca/FreeBSD"
Note: this only happens (so far) on *BSD x86_64 (it doesn't crash
on Linux x86_64 which should use the same asm code and of course
the application works fine on other platforms or when OpenSSL is
configured with no-asm).
Here's a gdb session (some parts omitted, it's rather long):
Breakpoint 2, SSL_accept (s=0x800c49800) at ssl_lib.c:936
936 if (s->handshake_func == 0)
(gdb) n
940 return(s->method->ssl_accept(s));
(gdb) step
ssl23_accept (s=0x800c49800) at s23_srvr.c:150
150 unsigned long Time=(unsigned long)time(NULL);
(gdb) n
151 void (*cb)(const SSL *ssl,int type,int val)=NULL;
(gdb) n
152 int ret= -1;
(gdb) n
155 RAND_add(&Time,sizeof(Time),0);
(gdb) step
RAND_add (buf=0x8007362a0, num=8, entropy=0) at rand_lib.c:155
155 const RAND_METHOD *meth = RAND_get_rand_method();
(gdb) step
RAND_get_rand_method () at rand_lib.c:94
94 if (!default_RAND_meth)
(gdb) n
113 return default_RAND_meth;
(gdb) n
RAND_add (buf=0x8007362a0, num=8, entropy=0) at rand_lib.c:156
156 if (meth && meth->add)
(gdb) n
157 meth->add(buf,num,entropy);
(gdb) step
ssleay_rand_add (buf=0x8007362a0, num=8, add=0) at md_rand.c:217
217 if (crypto_lock_rand)
262 EVP_MD_CTX_init(&m);
(gdb) step
EVP_MD_CTX_init (ctx=0x8007361a8) at digest.c:126
126 memset(ctx,'\0',sizeof *ctx);
ssleay_rand_add (buf=0x8007362a0, num=8, add=0) at md_rand.c:263
263 for (i=0; i<num; i+=MD_DIGEST_LENGTH)
(gdb) n
ssleay_rand_add (buf=0x8007362a0, num=8, add=0) at md_rand.c:270
270 k=(st_idx+j)-STATE_SIZE;
(gdb) n
271 if (k > 0)
(gdb)
277 MD_Update(&m,&(state[st_idx]),j);
(gdb)
280 MD_Update(&m,buf,j);
(gdb)
288 MD_Update(&m,(unsigned char *)&(md_c[0]),sizeof(md_c));
(gdb)
289 MD_Final(&m,local_md);
(gdb)
Program received signal SIGBUS, Bus error.
sha1_block_data_order_ssse3 () at sha1-x86_64.s:1328
1328 movdqa %xmm0,0(%rsp)
Current language: auto; currently asm
(gdb) where
#0 sha1_block_data_order_ssse3 () at sha1-x86_64.s:1328
#1 0x0000000000000070 in ?? ()
#2 0x0000000000724150 in ?? ()
#3 0x0000000000000000 in ?? ()
(gdb) i all
rax 0x67452301 1732584193
rbx 0xefcdab89 4023233417
rcx 0x98badcfe 2562383102
rdx 0x10325476 271733878
rsi 0xefcdab89 4023233417
rdi 0x800c39240 34372555328
rbp 0xc3d2e1f0 0xc3d2e1f0
rsp 0x800736048 0x800736048
r8 0x800c39240 34372555328
r9 0x800c3929c 34372555420
r10 0x800c3929c 34372555420
r11 0x45ed00 4582656
r12 0x800c06b20 34372348704
r13 0x800c06ac0 34372348608
r14 0x0 0
r15 0x800736328 34367300392
rip 0x45def1 0x45def1 <sha1_block_data_order_ssse3+129>
eflags 0x10206 66054
cs 0x43 67
ss 0x3b 59
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
st0 0 (raw 0x00000000000000000000)
st1 0 (raw 0x00000000000000000000)
st2 0 (raw 0x00000000000000000000)
st3 0 (raw 0x00000000000000000000)
st4 0 (raw 0x00000000000000000000)
st5 0 (raw 0x00000000000000000000)
st6 0 (raw 0x00000000000000000000)
st7 0 (raw 0x00000000000000000000)
fctrl 0x37f 895
fstat 0x0 0
ftag 0xffff 65535
fiseg 0x0 0
fioff 0x0 0
foseg 0x0 0
fooff 0x0 0
fop 0x0 0
xmm0 {f = {0x0, 0x26800000, 0x0, 0x6668c0}} {f = {2.82784731e+29,
-7.11626672e+13, -4.77179622e-28, 6711488.5}}
xmm1 {f = {0xe, 0x0, 0x0, 0x0}} {f = {14.9026852,
-1.12924267e-34, -3.71112094e-26, -0.00837085675}}
xmm2 {f = {0x80000000, 0x0, 0x80000000, 0x0}} {f = {1.83627225e+16,
-4.79289421e-38, 1.83627225e+16, -1.5553831e-05}}
xmm3 {f = {0x0, 0x0, 0x0, 0x0}} {f = {0, -0, 0,
5.82940161e-43}}
xmm4 {f = {0x0, 0x0, 0x0, 0x0}} {f = {1.28569695e-39,
8.03560591e-41, 1.937155e-41, 2.65677221e-39}}
xmm5 {f = {0x0, 0x0, 0x0, 0x0}} {f = {0, 1.27995723e-39,
5.14278778e-39, 4.38371001e-40}}
xmm6 {f = {0x0, 0x0, 0x0, 0x0}} {f = {9.25571649e-41,
1.56368425e-36, 4.12387433e-34, 1.08664755e-31}}
xmm7 {f = {0x0, 0x0, 0x0, 0x0}} {f = {2.05711511e-38,
1.36246568e-39, 8.03560591e-41, 7.59106472e-38}}
xmm8 {f = {0x0, 0x0, 0x0, 0x0}} {f = {0, 0, 0, 0}}
xmm9 {f = {0x80000000, 0x80000000, 0x80000000, 0x80000000}} {f = {
1.83627225e+16, 1.83627225e+16, 1.83627225e+16, 1.83627225e+16}}
xmm10 {f = {0xffc74f8b, 0xa8000000, 0x0, 0x55ca2a00}} {f = {
-3715189.5, -9.29393745e+14, 1.67237707e-37, -2.85565491e+09}}
xmm11 {f = {0x0, 0x0, 0x0, 0x0}} {f = {0, 0, 0, 0}}
xmm12 {f = {0x0, 0x0, 0x0, 0x0}} {f = {0, 0, 0, 0}}
xmm13 {f = {0x0, 0x0, 0x0, 0x0}} {f = {0, 0, 0, 0}}
xmm14 {f = {0x0, 0x0, 0x0, 0x0}} {f = {0, 0, 0, 0}}
xmm15 {f = {0x0, 0x0, 0x0, 0x0}} {f = {0, 0, 0, 0}}
mxcsr 0x1fa0 8096
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