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Device files in UNIX can be a major security hazard when an attacker is able to access them in an unauthorized way. For instance, if attackers can read or write to the {{/dev/kmem}} device, they may be able to alter their priority, UID, or other attributes of their process or simply crash the system. Similarly, access to disk devices, tape devices, network devices, and terminals being used by others all can lead to problems \[[Garfinkel 96|AA. C References#Garfinkel 96]\]. |
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struct stat s;
if (stat(filename, &s) == 0) {
if (S_ISREG (s.st_mode)) {
/* operate on file */
}
}
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