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Diffstat (limited to 'manual/filesys.texi')
| -rw-r--r-- | manual/filesys.texi | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/manual/filesys.texi b/manual/filesys.texi index c3ab7c5..4ae13dc 100644 --- a/manual/filesys.texi +++ b/manual/filesys.texi @@ -2345,6 +2345,13 @@ It is possible for @code{tmpnam} to fail if you call it too many times without removing previously created files. This is because the fixed length of a temporary file name gives room for only a finite number of different names. If @code{tmpnam} fails, it returns a null pointer. + +@strong{Warning:} Since between the time the pathname is constructed and +the file is created another process might have created a file with this +name using @code{tmpnam} is a possible security hole. The +implementation generates names which hardly can be predicted but opening +the file in any case should use the @code{O_EXCL} flag. Using +@code{tmpfile} is a safe way to avoid this problem. @end deftypefun @comment stdio.h @@ -2445,6 +2452,13 @@ The @code{mktemp} function generates a unique file name by modifying name, it makes @var{template} an empty string and returns that. If @var{template} does not end with @samp{XXXXXX}, @code{mktemp} returns a null pointer. + +@strong{Warning:} Since between the time the pathname is constructed and +the file is created another process might have created a file with this +name using @code{mktemp} is a possible security hole. The +implementation generates names which hardly can be predicted but opening +the file in any case should use the @code{O_EXCL} flag. Using +@code{mkstemp} is a safe way to avoid this problem. @end deftypefun @comment unistd.h |