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fix: bound PEM base64 decoding output

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This commit is contained in:
wangtsiao
2026-06-12 18:47:07 -10:00
parent 23375d1fa3
commit c5674af7f5
5 changed files with 241 additions and 12 deletions
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69
tests/base64test.c
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@@ -61,9 +61,78 @@ static int test_base64(void)
return 1;
}
struct base64_one_byte_buffer {
uint8_t data[1];
uint8_t canary[8];
};
static int test_base64_decode_update_ex_padding(void)
{
const uint8_t in[] = "AA==";
struct base64_one_byte_buffer buf;
uint8_t original_canary[sizeof(buf.canary)];
BASE64_CTX ctx;
int len = 0;
int ret;
memset(&buf, 0xff, sizeof(buf));
memset(buf.canary, 0xcc, sizeof(buf.canary));
memcpy(original_canary, buf.canary, sizeof(original_canary));
base64_decode_init(&ctx);
ret = base64_decode_update_ex(&ctx, in, sizeof(in) - 1,
buf.data, &len, sizeof(buf.data));
if (ret != 0 || len != 1 || buf.data[0] != 0) {
error_print();
return -1;
}
if (memcmp(buf.canary, original_canary, sizeof(original_canary)) != 0) {
error_print();
return -1;
}
printf("%s() ok\n", __FUNCTION__);
return 1;
}
struct base64_two_byte_buffer {
uint8_t data[2];
uint8_t canary[8];
};
static int test_base64_decode_update_ex_maxout(void)
{
const uint8_t in[] = "AAAA";
struct base64_two_byte_buffer buf;
uint8_t original_canary[sizeof(buf.canary)];
BASE64_CTX ctx;
int len = 0;
int ret;
memset(&buf, 0xcc, sizeof(buf));
memcpy(original_canary, buf.canary, sizeof(original_canary));
base64_decode_init(&ctx);
ret = base64_decode_update_ex(&ctx, in, sizeof(in) - 1,
buf.data, &len, sizeof(buf.data));
if (ret != -1 || len != 0) {
error_print();
return -1;
}
if (memcmp(buf.canary, original_canary, sizeof(original_canary)) != 0) {
error_print();
return -1;
}
printf("%s() ok\n", __FUNCTION__);
return 1;
}
int main(void)
{
if (test_base64() != 1) goto err;
if (test_base64_decode_update_ex_padding() != 1) goto err;
if (test_base64_decode_update_ex_maxout() != 1) goto err;
printf("%s all tests passed\n", __FILE__);
return 0;
err: