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printf: use sprintf() to work around glibc complaining about %n in a writable format string

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Don't use snprintf(), but use sprintf instead and do our own
length calculations, because glibc may complain about us passing
%n in a format string if the string is in writable memory, and
here the format string is always in writable memory since we
construct it on the fly. This happens if glibc has been compiled
with _FORTIFY_SOURCE=2, which seems to be the case on some
distros/systems). On the upside, we now use the sprintf code path
on all systems which should be better from a maintenance point
of view.

https://bugzilla.gnome.org/show_bug.cgi?id=697970
This commit is contained in:
Tim-Philipp Müller 2013-04-14 11:23:10 +01:00
parent 637e8b5e1c
commit 91c42b9380
1 changed files with 4 additions and 11 deletions
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15
gst/printf/gst-printf.h
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@ -36,18 +36,11 @@
#define realloc g_realloc
#define free g_free
/* If GLib is using the system printf, we can assume C99 behaviour */
#ifdef GLIB_USING_SYSTEM_PRINTF
#define HAVE_C99_SNPRINTF
#endif
/* Ensure only C99 snprintf gets used */
/* Don't use snprintf(); we have to use sprintf instead and do our own
* length calculations, because glibc doesn't allow passing %n in a format
* string if the string is in writable memory (if glibc has been compiled
* with _FORTIFY_SOURCE=2 which seems to be the case on some distros/systems) */
#undef HAVE_SNPRINTF
#ifdef HAVE_C99_SNPRINTF
#define HAVE_SNPRINTF 1
#else
#undef HAVE_SNPRINTF
#endif
/* based on glib's config.h.win32.in */
#ifdef G_OS_WIN32