Hello Takahiro,
on the 32bit Wandboard (with i.mx6 CPU) running the lib_asn1_pkcs7 unit test results in a crash due to an unaligned access occurring when br_i32_decode() is called by rsa_gen_key_prop().
Please, check the alignment assumptions for src when calling br_i32_decode(). If src is only 1 byte aligned, you should neither call be32_to_cpup() nor be16_to_cpup() which assume 32bit and 16bit alignment.
----Running lib tests---- Running 14 lib tests Test: lib_asn1_pkcs7 data abort pc : [<8efb3a8e>] lr : [<8efb3bbd>] reloc pc : [<17845a8e>] lr : [<17845bbd>] sp : 8e561330 ip : 00000001 fp : 8efd9d66 r10: 8e58f040 r9 : 8e56dec0 r8 : 8e588748 r7 : 00000001 r6 : 8e58f350 r5 : 8e58f350 r4 : 8e58f350 r3 : 000000fc r2 : 00000100 r1 : 8e58ee49 r0 : 8e58f350 Flags: nzCv IRQs off FIQs off Mode SVC_32 (T) Code: ea43 4302 e7a2 3b04 (58c8) ba00 Resetting CPU ...
resetting ...
br_i32_decode():
return be16_to_cpup(src); 17845a84: b29b uxth r3, r3 w = ((uint32_t)buf[0] << 16) 17845a86: ea43 4302 orr.w r3, r3, r2, lsl #16 17845a8a: e7a2 b.n 178459d2 <br_i32_decode+0x24> u -= 4; 17845a8c: 3b04 subs r3, #4 return __arch__swab32p(x); 17845a8e: 58c8 ldr r0, [r1, r3] <<<<<<<<<<<<<< 17845a90: ba00 rev r0, r0 x[v ++] = br_dec32be(buf + u); 17845a92: f845 0f04 str.w r0, [r5, #4]! if (u < 4) { 17845a96: e78f b.n 178459b8 <br_i32_decode+0xa> return y ^ (-ctl & (x ^ y));
rsa_gen_key_prop():
/* n0 inverse */ br_i32_decode(n, &rsa_key.n[i], rsa_key.n_sz - i); 17845bac: 9910 ldr r1, [sp, #64] ; 0x40 (*prop)->exp_len = sizeof(uint64_t); 17845bae: 615a str r2, [r3, #20] br_i32_decode(n, &rsa_key.n[i], rsa_key.n_sz - i); 17845bb0: 9a18 ldr r2, [sp, #96] ; 0x60 17845bb2: 4439 add r1, r7 17845bb4: 1bd2 subs r2, r2, r7 17845bb6: 4630 mov r0, r6 17845bb8: f7ff fef9 bl 178459ae <br_i32_decode> <<<<<< (*prop)->n0inv = br_i32_ninv32(n[1]); 17845bbc: 6873 ldr r3, [r6, #4] 17845bbe: 682a ldr r2, [r5, #0] y = 2 - x; 17845bc0: f1c3 0102 rsb r1, r3, #2
Best regards
Heinrich