malloc: Simplify implementation of __malloc_assert

It is prudent not to run too much code after detecting heap
corruption, and __fxprintf is really complex.  The line number
and file name do not carry much information, so it is not included
in the error message.  (__libc_message only supports %s formatting.)
The function name and assertion should provide some context.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
(cherry picked from commit ac8047cdf326504f652f7db97ec96c0e0cee052f)

diff --git a/malloc/malloc.c b/malloc/malloc.c
index 7882c70f0a0312d10d1dff9ab5258bdba4d6b948..d31e985ecce968fe53dfcf0c499c96d628891d8b 100644 (file)
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -294,19 +294,14 @@
 # define __assert_fail(assertion, file, line, function)                        \
         __malloc_assert(assertion, file, line, function)
 
-extern const char *__progname;
-
-static void
+_Noreturn static void
 __malloc_assert (const char *assertion, const char *file, unsigned int line,
                 const char *function)
 {
-  (void) __fxprintf (NULL, "%s%s%s:%u: %s%sAssertion `%s' failed.\n",
-                    __progname, __progname[0] ? ": " : "",
-                    file, line,
-                    function ? function : "", function ? ": " : "",
-                    assertion);
-  fflush (stderr);
-  abort ();
+  __libc_message (do_abort, "\
+Fatal glibc error: malloc assertion failure in %s: %s\n",
+                 function, assertion);
+  __builtin_unreachable ();
 }
 #endif
 #endif