linux-kernel - [PATCH] KVM: remove printing of token address

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Message-Id: <1507530614-10504-1-git-send-email-me@tobin.cc>
Date:   Mon,  9 Oct 2017 17:30:14 +1100
From:   "Tobin C. Harding" <me@...in.cc>
To:     Paolo Bonzini <pbonzini@...hat.com>, rkrcmar@...hat.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Tobin C. Harding" <me@...in.cc>
Subject: [PATCH] KVM: remove printing of token address

KVM currently prints the address of the consumer token. It is not
immediately clear what benefit it is to see this address. Printing
this address leaks kernel pointers into dmesg and is a security risk.

Remove the consumer token address from error message output.

Signed-off-by: Tobin C. Harding <me@...in.cc>
---
 virt/kvm/eventfd.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index f2ac53ab8243..b54503ed60bd 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -416,8 +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",
-				irqfd->consumer.token, ret);
+			pr_info("irq bypass consumer registration fails: %d\n", ret);
 	}
 #endif
 
-- 
2.7.4