linux-kernel - [PATCH v3] x86/realmode: don't leak kernel addresses

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Message-Id: <20190326203046.20787-1-mcroce@redhat.com>
Date:   Tue, 26 Mar 2019 21:30:46 +0100
From:   Matteo Croce <mcroce@...hat.com>
To:     x86@...nel.org
Cc:     "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v3] x86/realmode: don't leak kernel addresses

Since commit ad67b74d2469d9b8 ("printk: hash addresses printed with %p"),
at boot "____ptrval____" is printed instead of the trampoline addresses:

    Base memory trampoline at [(____ptrval____)] 99000 size 24576

Remove the print as we don't want to leak kernel addresses.

Fixes: ad67b74d2469d9b8 ("printk: hash addresses printed with %p")
Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
 arch/x86/realmode/init.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index d10105825d57..47d097946872 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -20,8 +20,6 @@ void __init set_real_mode_mem(phys_addr_t mem, size_t size)
 	void *base = __va(mem);
 
 	real_mode_header = (struct real_mode_header *) base;
-	printk(KERN_DEBUG "Base memory trampoline at [%p] %llx size %zu\n",
-	       base, (unsigned long long)mem, size);
 }
 
 void __init reserve_real_mode(void)
-- 
2.20.1