diff options
Diffstat (limited to 'manual/filesys.texi')
| -rw-r--r-- | manual/filesys.texi | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/manual/filesys.texi b/manual/filesys.texi index 942eb7fb12..c550d72f1b 100644 --- a/manual/filesys.texi +++ b/manual/filesys.texi @@ -2870,7 +2870,7 @@ file is created another process might have created a file with the same name using @code{tmpnam}, leading to a possible security hole. The implementation generates names which can hardly be predicted, but when opening the file you should use the @code{O_EXCL} flag. Using -@code{tmpfile} is a safe way to avoid this problem. +@code{tmpfile} or @code{mkstemp} is a safe way to avoid this problem. @end deftypefun @comment stdio.h @@ -2881,6 +2881,9 @@ that if @var{result} is a null pointer it returns a null pointer. This guarantees reentrancy because the non-reentrant situation of @code{tmpnam} cannot happen here. + +@strong{Warning}: This function has the same security problems as +@code{tmpnam}. @end deftypefun @comment stdio.h @@ -2937,6 +2940,13 @@ The directory @file{/tmp}. @end itemize This function is defined for SVID compatibility. + +@strong{Warning:} Between the time the pathname is constructed and the +file is created another process might have created a file with the same +name using @code{tempnam}, leading to a possible security hole. The +implementation generates names which can hardly be predicted, but when +opening the file you should use the @code{O_EXCL} flag. Using +@code{tmpfile} or @code{mkstemp} is a safe way to avoid this problem. @end deftypefun @cindex TMPDIR environment variable |