（2-8）考察下面的代码：01 enum { BLOCK_HEADER_SIZE = 16 };02 void *AllocateBlock(size_t length) {03 struct memBlock *mBlock;04 if (length + BLOCK_HEADER_SIZE > (unsigned long long)SIZE_MAX) {05 return NULL;06 }07 mBlock = (struct memBlock *)malloc(08 length + BLOCK_HEADER_SIZE09 );10 if (!mBlock) return NULL;11 /* fill in block header and return data portion */12 return mBlock;13 }这段程序最根本的漏洞是什么（） A: 非异常整数逻辑错误； B: 有符号整数溢出； C: 转换错误； D: 无符号整数回环。

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2022-06-09

（2-8）考察下面的代码：01 enum { BLOCK_HEADER_SIZE = 16 };02 void AllocateBlock(size_t length) {03 struct memBlock mBlock;04 if (length + BLOCK_HEADER_SIZE > (unsigned long long)SIZE_MAX) {05 return NULL;06 }07 mBlock = (struct memBlock )malloc(08 length + BLOCK_HEADER_SIZE09 );10 if (!mBlock) return NULL;11 / fill in block header and return data portion */12 return mBlock;13 }这段程序最根本的漏洞是什么（） A: 非异常整数逻辑错误； B: 有符号整数溢出； C: 转换错误； D: 无符号整数回环。

（2-8）考察下面的代码：01 enum { BLOCK_HEADER_SIZE = 16 };02 void *AllocateBlock(size_t length) {03 struct memBlock *mBlock;04 if (length + BLOCK_HEADER_SIZE > (unsigned long long)SIZE_MAX) {05 return NULL;06 }07 mBlock = (struct memBlock *)malloc(08 length + BLOCK_HEADER_SIZE09 );10 if (!mBlock) return NULL;11 /* fill in block header and return data portion */12 return mBlock;13 }这段程序最根本的漏洞是什么（）
A: 非异常整数逻辑错误；
B: 有符号整数溢出；
C: 转换错误；
D: 无符号整数回环。

答案：

D

举一反三

内容

0
HDFS默认Block Size的大小是（）
1
在Java中，获取文件大小的方法，是（) A: length() B: length C: size() D: size
2
Identify two situations in which the block header grows in a data block. （） A: when row directories need more row entries B: when there is row migration in the data block C: when there is an increase in the PCTFREE value for the data block D: when more transaction slots are required than are initially configured
3
Identify two situations in which the block header grows in a data block. （） A: Awhen row directories need more row entries B: Bwhen there is row migration in the data block C: Cwhen there is an increase in the PCTFREE value for the data block D: Dwhen more transaction slots are required than are initially configured
4
HDFS的Block Size 是不可以修改的。