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* libc/include/stdio.h (_mkstemp_r, _mktemp_r): Move declarations 

to stdlib.h.
	* libc/include/stdlib.h (mktemp, _mktemp_r): Warn when using.
	* libc/stdio/mktemp.c: Explain the security risk when using
	mktemp.
This commit is contained in:
Corinna Vinschen 2009-03-14 12:14:08 +00:00
parent c7cf32ee27
commit 71675a3908
4 changed files with 18 additions and 3 deletions
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8
newlib/ChangeLog
View File

@ -1,3 +1,11 @@
2009-03-14 Corinna Vinschen <corinna@vinschen.de>
* libc/include/stdio.h (_mkstemp_r, _mktemp_r): Move declarations
to stdlib.h.
* libc/include/stdlib.h (mktemp, _mktemp_r): Warn when using.
* libc/stdio/mktemp.c: Explain the security risk when using
mktemp.
2009-03-12 Craig Howland <howland@LGSInnovations.com>
* libc/time/time.tex (wcsftime.def): Include.

2
newlib/libc/include/stdio.h
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@ -411,8 +411,6 @@ int _EXFUN(_iprintf_r, (struct _reent *, const char *, ...)
_ATTRIBUTE ((__format__ (__printf__, 2, 3))));
int _EXFUN(_iscanf_r, (struct _reent *, const char *, ...)
_ATTRIBUTE ((__format__ (__scanf__, 2, 3))));
int _EXFUN(_mkstemp_r, (struct _reent *, char *));
char * _EXFUN(_mktemp_r, (struct _reent *, char *));
FILE * _EXFUN(_open_memstream_r, (struct _reent *, char **, size_t *));
void _EXFUN(_perror_r, (struct _reent *, const char *));
int _EXFUN(_printf_r, (struct _reent *, const char *, ...)

4
newlib/libc/include/stdlib.h
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@ -98,7 +98,9 @@ size_t _EXFUN(_wcstombs_r,(struct _reent *, char *, const wchar_t *, size_t, _mb
#ifndef __STRICT_ANSI__
#ifndef _REENT_ONLY
int _EXFUN(mkstemp,(char *));
char * _EXFUN(mktemp,(char *));
int _EXFUN(_mkstemp_r, (struct _reent *, char *));
char * _EXFUN(mktemp,(char *) _ATTRIBUTE ((warning ("the use of `mktemp' is dangerous; use `mkstemp' instead"))));
char * _EXFUN(_mktemp_r, (struct _reent *, char *) _ATTRIBUTE ((warning ("the use of `mktemp' is dangerous; use `mkstemp' instead"))));
#endif
#endif
_VOID _EXFUN(qsort,(_PTR __base, size_t __nmemb, size_t __size, int(*_compar)(const _PTR, const _PTR)));

7
newlib/libc/stdio/mktemp.c
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@ -85,6 +85,13 @@ unless it could not generate an unused filename, or the pattern you
provided is not suitable for a filename; in that case, it returns
<<-1>>.
NOTES
Never use <<mktemp>>. The generated filenames are easy to guess and
there's a race between the test if the file exists and the creation
of the file. In combination this makes <<mktemp>> prone to attacks
and using it is a security risk. Whenever possible use <<mkstemp>>
instead. It doesn't suffer the race condition.
PORTABILITY
ANSI C does not require either <<mktemp>> or <<mkstemp>>; the System
V Interface Definition requires <<mktemp>> as of Issue 2.