[PATCH 0/3][v4] add support for never printing hashed addresses

Timur Tabi
2021-02-14T16:14:42Z

Although hashing addresses printed via printk does make the
kernel more secure, it interferes with debugging, especially
with some functions like print_hex_dump() which always uses
hashed addresses.

To avoid having to choose between %p and %px, it's easier to
add a kernel command line that treats all %p as %px. This
encourages developers to use %p more without making debugging
more difficult.

Patches #1 and #2 upgrade the kselftest framework so that
it can report on tests that were skipped outright. This
is needed for the test_printf module which will now skip
%p hashing tests if hashing is disabled.

Patch #2 upgrades the printf library to check the command
line. It also updates test_printf().

Timur Tabi (3):
[v4] lib: use KSTM_MODULE_GLOBALS macro in kselftest drivers
[v4] kselftest: add support for skipped tests
[v4] lib/vsprintf: debug_never_hash_pointers prints all addresses as
unhashed

.../admin-guide/kernel-parameters.txt | 15 ++++++++
lib/test_bitmap.c | 3 +-
lib/test_printf.c | 12 +++++-
lib/vsprintf.c | 38 ++++++++++++++++++-
tools/testing/selftests/kselftest_module.h | 18 ++++++---
5 files changed, 74 insertions(+), 12 deletions(-)

--
2.25.1