Code A (below) first checks the status of a file and then opens it and uses it. It contains a vulnerability.Explain what the vulnerability is and why Code B (below) resolves the vulnerability. Code B:1. struct stat lstat_info, fstat_info;2. int fd;3. if (lstat("some_file", &lstat_info) == -1) {4. err (1, "lstat");5. }6. if ((fd = open("some_file", O_EXCL | O_RDWR, 0600))7. err(2, "some_file");8. }9. if (fstat (fd, &fstat_info) == -1)10. {11.12.}13. if (lstat_info.st_mode == fstat_info.st_mode &&14.lstat_info.st_ino == fstat_info.st_ino)15. //process the file-err (3, "fstat");== -1){ Code A:1. struct stat lstat_info;2. int fd;3. if (1stat ("some_file", &lstat_info) == -1) {4. err (1, "lstat");5. }6. if ((fd = open("some_file", O_EXCL | O_RDWR, 0600))7. err (2, "some_file");8. }9. //process the file== -1) {

The question seeks an explanation of a specific security concern within a code snippet (Code A) and…

Answered: Code A (below) first checks the status…

Code A (below) first checks the status of a file and then opens it and uses it. It contains a vulnerability. Explain what the vulnerability is and why Code B (below) resolves the vulnerability.

Programming with Microsoft Visual Basic 2017

8th Edition

ISBN:9781337102124

Author:Diane Zak

Publisher:Diane Zak

Chapter5: The Repetition Structure

Section: Chapter Questions

Problem 1MQ6: Write an Add method that adds the contents of the decPrice variable to the lstPrices control.

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Concept explainers

Parallel and Distributed Storage

A parallel storage file system is a sort of clustered file system. A clustered file system is a storage system shared by multiple devices simultaneously.

Question

Code A (below) first checks the status of a file and then opens it and uses it. It contains a vulnerability.
Explain what the vulnerability is and why Code B (below) resolves the vulnerability.

Code B:
1. struct stat lstat_info, fstat_info;
2. int fd;
3. if (lstat("some_file", &lstat_info) == -1) {
4. err (1, "lstat");
5. }
6. if ((fd = open("some_file", O_EXCL | O_RDWR, 0600))
7. err(2, "some_file");
8. }
9. if (fstat (fd, &fstat_info) == -1)
10. {
11.
12.
}
13. if (lstat_info.st_mode == fstat_info.st_mode &&
14.
lstat_info.st_ino == fstat_info.st_ino)
15. //process the file
-
err (3, "fstat");
== -1)
{

Code A:
1. struct stat lstat_info;
2. int fd;
3. if (1stat ("some_file", &lstat_info) == -1) {
4. err (1, "lstat");
5. }
6. if ((fd = open("some_file", O_EXCL | O_RDWR, 0600))
7. err (2, "some_file");
8. }
9. //process the file
== -1) {

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