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Date: Wed, 30 May 2018 14:27:44 +1000 From: "Tobin C. Harding" <me@...in.cc> To: Randy Dunlap <rdunlap@...radead.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Steven Rostedt <rostedt@...dmis.org>, Kees Cook <keescook@...omium.org>, Anna-Maria Gleixner <anna-maria@...utronix.de>, Theodore Ts'o <tytso@....edu>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org Subject: Re: [PATCH v6 4/4] vsprintf: Add command line option debug_boot_weak_hash On Mon, May 28, 2018 at 10:40:43AM -0700, Randy Dunlap wrote: > On 05/27/2018 06:46 PM, Tobin C. Harding wrote: > > 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. > > > > Cc: Anna-Maria Gleixner <anna-maria@...utronix.de> > > Cc: Steven Rostedt <rostedt@...dmis.org> > > Cc: Randy Dunlap <rdunlap@...radead.org> > > Signed-off-by: Tobin C. Harding <me@...in.cc> > > --- > > Documentation/admin-guide/kernel-parameters.txt | 9 +++++++++ > > lib/vsprintf.c | 20 ++++++++++++++++++++ > > 2 files changed, 29 insertions(+) > > > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > > index f2040d46f095..8a86d895343e 100644 > > --- a/Documentation/admin-guide/kernel-parameters.txt > > +++ b/Documentation/admin-guide/kernel-parameters.txt > > @@ -753,6 +753,15 @@ > > > > debug [KNL] Enable kernel debugging (events log level). > > > > Hi, > This is much more readable than the previous version. Thanks. Thanks for following up with this one Randy. Tobin
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