vsprintf: Add command line option debug_boot_weak_hash

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Currently printing [hashed] pointers requires enough entropy to be
available.  Early in the boot sequence this may not be the case
resulting in a dummy string '(____ptrval____)' being printed.  This
makes debugging the early boot sequence difficult.  We can relax the
requirement to use cryptographically secure hashing during debugging.
This enables debugging while keeping development/production kernel
behaviour the same.

If new command line option debug_boot_weak_hash is enabled use
cryptographically insecure hashing and hash pointer value immediately.

Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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Tobin C. Harding 2018-06-22 09:15:34 +10:00 • committed by Theodore Ts'o

parent 1c4facb846

commit 3672476eda

2 changed files with 25 additions and 0 deletions

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lib/vsprintf.c

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