40 lines
1.6 KiB
C
40 lines
1.6 KiB
C
$NetBSD: patch-lib_vasnprintf.c,v 1.2 2017/08/18 21:41:19 adam Exp $
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Avoid CVS crashing on systems using _FORTIFY_SOURCE by default.
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http://git.savannah.gnu.org/cgit/gnulib.git/commit/lib/vasnprintf.c?id=913c09becd9df89dbd9b9f386e7f35c240d5efe8
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Fix crash on macOS 10.13 (Darwin 7).
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http://git.savannah.gnu.org/cgit/gnulib.git/commit/lib/vasnprintf.c?id=7df04f9b8a0adb1575ca0555775ec10860143cbf
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--- lib/vasnprintf.c.orig 2005-05-23 17:44:33.000000000 +0000
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+++ lib/vasnprintf.c
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@@ -558,9 +558,29 @@ VASNPRINTF (CHAR_T *resultbuf, size_t *l
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}
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*p = dp->conversion;
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#if USE_SNPRINTF
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+# if !(__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3) \
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+ || (defined __APPLE__ && defined __MACH__))
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p[1] = '%';
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p[2] = 'n';
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p[3] = '\0';
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+# else
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+ /* On glibc2 systems from glibc >= 2.3 - probably also older
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+ ones - we know that snprintf's returns value conforms to
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+ ISO C 99: the gl_SNPRINTF_DIRECTIVE_N test passes.
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+ Therefore we can avoid using %n in this situation.
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+ On glibc2 systems from 2004-10-18 or newer, the use of %n
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+ in format strings in writable memory may crash the program
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+ (if compiled with _FORTIFY_SOURCE=2), so we should avoid it
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+ in this situation. */
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+ /* On Mac OS X 10.3 or newer, we know that snprintf's return
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+ value conforms to ISO C 99: the tests gl_SNPRINTF_RETVAL_C99
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+ and gl_SNPRINTF_TRUNCATION_C99 pass.
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+ Therefore we can avoid using %n in this situation.
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+ On Mac OS X 10.13 or newer, the use of %n in format strings
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+ in writable memory by default crashes the program, so we
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+ should avoid it in this situation. */
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+ p[1] = '\0';
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+# endif
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#else
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p[1] = '\0';
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#endif
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