SEI CERT C Coding Standard

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This compliant solution eliminates the race condition by:

  1. calling lstat() on the filenamefile name.
  2. calling open() to open the file.
  3. calling fstat() on the file descriptor returned by open().
  4. comparing the file information returned by the calls to lstat() and fstat() to ensure that the files are the same.

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Wiki Markup
\[[Dowd 06|AA. C References#Dowd 06]\] Chapter 9, "UNIX 1: Privileges and Files"
\[[ISO/IEC 9899-:1999|AA. C References#ISO/IEC 9899-1999]\] Section 7.19, "Input/output <stdio.h>"
\[[MITRE 07|AA. C References#MITRE 07]\] [CWE ID 365|http://cwe.mitre.org/data/definitions/365.html], "Race Condition in Switch"
\[[Open Group 04|AA. C References#Open Group 04]\] [lstat()|http://www.opengroup.org/onlinepubs/000095399/functions/lstat.html], [fstat()|http://www.opengroup.org/onlinepubs/009695399/functions/fstat.html], [open()|http://www.opengroup.org/onlinepubs/009695399/functions/open.html]
\[[Seacord 05|AA. C References#Seacord 05]\] Chapter 7, "File I/O"

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