linux-kernel - [PATCH 4/5] KVM: use %px to print token identifier

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Message-Id: <1511826058-2563-5-git-send-email-me@tobin.cc>
Date:   Tue, 28 Nov 2017 10:40:57 +1100
From:   "Tobin C. Harding" <me@...in.cc>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Tobin C. Harding" <me@...in.cc>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Theodore Ts'o <tytso@....edu>,
        Kees Cook <keescook@...omium.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tycho Andersen <tycho@...ho.ws>,
        "Roberts, William C" <william.c.roberts@...el.com>,
        Tejun Heo <tj@...nel.org>,
        Jordan Glover <Golden_Miller83@...tonmail.ch>,
        Greg KH <gregkh@...uxfoundation.org>,
        Petr Mladek <pmladek@...e.com>, Joe Perches <joe@...ches.com>,
        Ian Campbell <ijc@...lion.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <wilal.deacon@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Chris Fries <cfries@...gle.com>,
        Dave Weinstein <olorin@...gle.com>,
        Daniel Micay <danielmicay@...il.com>,
        Djalal Harouni <tixxdz@...il.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Subject: [PATCH 4/5] KVM: use %px to print token identifier

Currently token address is printed using %p. This exposes the address of
the token in dmesg and potentially leaks sensitive information to
userspace. In this instance the address is being used as a unique
identifier for the token, we can use the newly defined printk specifier
%px for exactly this purpose.

Use the new %px specifier to print a unique identifier for the token.

Signed-off-by: Tobin C. Harding <me@...in.cc>
---
 virt/kvm/eventfd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index f2ac53ab8243..9c700fdf571c 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -416,7 +416,7 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
 		irqfd->consumer.start = kvm_arch_irq_bypass_start;
 		ret = irq_bypass_register_consumer(&irqfd->consumer);
 		if (ret)
-			pr_info("irq bypass consumer (token %p) registration fails: %d\n",
+			pr_info("irq bypass consumer (token %px) registration fails: %d\n",
 				irqfd->consumer.token, ret);
 	}
 #endif
-- 
2.7.4