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本帖最后由 lanyang123 于 2011-09-16 15:29 编辑
内核版本2.6.18
使用内核中的AES加密算法对数据进行加解密，编写函数如下，
int mycipher_test(char *alg,int encflag,char *code,char *key)，其中第一个参数alg是AES加密算法的标志，第二个参数encflag是判断加密还
是解密，第三个参数code是要加解密的数据，第四个参数key是密钥。
该函数以模块的方式编译进内核。
具体代码如下- int mycipher_test(char *alg,int encflag,char *code,char *key)
- {
- int ret,keylen,codelen;
- struct scatterlist sg;
- char *result;
- struct crypto_tfm *tfm;
- keylen = 16;
- codelen = strlen(code);
-
- /*限制传入的数据是16字节，因为AES加密算法要求加密数据的长度为16字节整数倍*/
- if(codelen!=16){
- return -1;
- }
-
- /* Allocate transform for AES ECB mode */
- tfm = crypto_alloc_tfm(alg,0);
- if(IS_ERR(tfm)) {
-
- printk("<1>failed to load transform for aes ECB mode !\n");
- return -1;
- }
- /*设置加密密钥*/
- ret = crypto_cipher_setkey(tfm,key,keylen);
- if(ret) {
- printk("<1>failed to setkey \n");
- goto failed1;
- }
- sg_init_one(&sg,code,16);//?
- switch(encflag){
-
- case 0:/*加密*/
- ret = crypto_cipher_encrypt(tfm,&sg,&sg,16);//可能出错处
- if(ret) {
- printk("<1>encrypt failed \n");
- goto failed1;
- }
- crypto_free_tfm(tfm);
- return 0;
- break;
- case 1:/*解密*/
- ret = crypto_cipher_decrypt(tfm,&sg,&sg,16);//可能出错处
- if(ret) {
- printk("<1>dencrypt failed \n");
- goto failed1;
- }
- crypto_free_tfm(tfm);
- return 0;
- break;
- default:
- printk("error\n");
- return -1;
- }
- failed1:
- crypto_free_tfm(tfm);
- return -1;
- }
BUG: unable to handle kernel paging request at virtual address 0000120c
printing eip:
c101b0d2
*pde = 16cc1067
Oops: 0000 [#1]
SMP
Modules linked in: autofs4 hidp rfcomm l2cap bluetooth sunrpc ip_conntrack_netbios_ns ipt_REJECT xt_state ip_conntrack nfnetlink iptable_filter ip_tables ip6t_REJECT xt_tcpudp ip6table_filter ip6_tables x_tables acpiphp video sbs i2c_ec button battery asus_acpi ac aes ipv6 lp snd_ens1371 sg gameport snd_rawmidi snd_ac97_codec snd_ac97_bus snd_seq_dummy floppy i2c_piix4 snd_seq_oss pcspkr snd_seq_midi_event i2c_core snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm pcnet32 snd_timer snd soundcore mii snd_page_alloc parport_pc parport serio_raw ide_cd cdrom dm_snapshot dm_zero dm_mirror dm_mod mptspi mptscsih mptbase scsi_transport_spi sd_mod scsi_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd
CPU: 0
EIP: 0060:[<c101b0d2>] Not tainted VLI
EFLAGS: 00010212 (2.6.18.1 #82)
EIP is at kmap_atomic+0x1b/0x7f
eax: 00000001 ebx: 00000007 ecx: c1cc2840 edx: 00000000
esi: 00000010 edi: d718fdac ebp: 00000010 esp: d718fd10
ds: 007b es: 007b ss: 0068
Process firefox-bin (pid: 4309, ti=d718f000 task=c0a03870 task.ti=d718f000)
Stack: d718fd4c c10c1f9e d404d000 c10c2553 d718fd7c d672a800 00000010 00000003
d404d000 d718fd9c c1cc2840 c1350761 00000010 00000010 0000084e d718fd9c
c1cc2840 00000000 00000010 00000010 0000084e c10c21e7 0000084e d718fdac
Call Trace:
[<c10c1f9e>] scatterwalk_map+0x2c/0x34
[<c10c2553>] crypt+0xbd/0x1f1
[<c10c21e7>] ecb_process+0x0/0x4b
[<c10c273c>] ecb_decrypt+0x33/0x38
[<e0a5b42e>] aes_decrypt+0x0/0xf62 [aes]
[<c10c21e7>] ecb_process+0x0/0x4b
[<c10c213e>] setkey+0x24/0x27
[<c10c32ae>] mycipher_test+0x10e/0x150
[<c118e7ce>] sock_recvmsg+0x162/0x19b
[<c103334d>] autoremove_wake_function+0x0/0x2d
[<c11eae0b>] schedule+0x907/0x9b4
[<c1057bef>] find_extend_vma+0x12/0x49
[<c1036067>] get_futex_key+0x40/0xd0
[<c118fdfe>] sys_recvfrom+0xcf/0x137
[<c1037092>] do_futex+0x20d/0xabc
[<c10d31d1>] vsnprintf+0x419/0x457
[<c1026b6d>] current_fs_time+0x4a/0x55
[<c107b5fe>] touch_atime+0x60/0x92
[<c107028f>] pipe_readv+0x315/0x321
[<c118fe7f>] sys_recv+0x19/0x1d
[<c11902aa>] sys_socketcall+0x117/0x19e
[<c1003d0b>] syscall_call+0x7/0xb
Code: 01 00 00 c1 e8 0c c1 e0 05 03 05 10 06 38 c1 c3 53 89 c1 89 e0 89 d3 25 00 f0 ff ff ff 40 14 8b 01 c1 e8 1e 8b 14 85 ac e6 2b c1 <8b> 82 0c 12 00 00 05 80 37 00 00 39 c2 74 08 5b 89 c8 e9 b0 8c
EIP: [<c101b0d2>] kmap_atomic+0x1b/0x7f SS:ESP 0068:d718fd10
这个错误困扰很久了，请各位大侠赐教。 |
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发表于 2011-09-16 15:22
发表于 2011-09-16 15:34
