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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2015-11-06 16:30:29 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-06 17:50:42 -0800
commit707cc7280f452a162c52bc240eae62568b9753c2 (patch)
treed0d32718d956868c4111a1926ca6067d14e2e51f /lib/Kconfig.debug
parent80c9eb46fa7236c1236ec695bfa2403c10cb8645 (diff)
downloadop-kernel-dev-707cc7280f452a162c52bc240eae62568b9753c2.zip
op-kernel-dev-707cc7280f452a162c52bc240eae62568b9753c2.tar.gz
test_printf: test printf family at runtime
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>
Diffstat (limited to 'lib/Kconfig.debug')
-rw-r--r--lib/Kconfig.debug3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1d1521c..16bf3bc 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1686,6 +1686,9 @@ config TEST_STRING_HELPERS
config TEST_KSTRTOX
tristate "Test kstrto*() family of functions at runtime"
+config TEST_PRINTF
+ tristate "Test printf() family of functions at runtime"
+
config TEST_RHASHTABLE
tristate "Perform selftest on resizable hash table"
default n
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