user/sven/linux.git/lib/test_printf.c, branch v4.4.2Linux Kernel
https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=v4.4.22015-11-07T01:50:42Ztest_printf: test printf family at runtime2015-11-07T01:50:42ZRasmus Villemoeslinux@rasmusvillemoes.dk2015-11-07T00:30:29Zurn:sha1:707cc7280f452a162c52bc240eae62568b9753c2
This adds a simple module for testing the kernel's printf facilities.
Previously, some %p extensions have caused a wrong return value in case
the entire output didn't fit and/or been unusable in kasprintf(). This
should help catch such issues. Also, it should help ensure that changes
to the formatting algorithms don't break anything.
I'm not sure if we have a struct dentry or struct file lying around at
boot time or if we can fake one, but most %p extensions should be
testable, as should the ordinary number and string formatting.
The nature of vararg functions means we can't use a more conventional
table-driven approach.
For now, this is mostly a skeleton; contributions are very
welcome. Some tests are/will be slightly annoying to write, since the
expected output depends on stuff like CONFIG_*, sizeof(long), runtime
values etc.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Martin Kletzander <mkletzan@redhat.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>