linux-kernel - [tip:x86/urgent] x86/realmode: Don't leak the trampoline kernel address

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Message-ID: <tip-b929a500d68479163c48739d809cbf4c1335db6f@git.kernel.org>
Date:   Wed, 27 Mar 2019 06:28:02 -0700
From:   tip-bot for Matteo Croce <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, bp@...e.de, x86@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        mingo@...nel.org, mcroce@...hat.com
Subject: [tip:x86/urgent] x86/realmode: Don't leak the trampoline kernel
 address

Commit-ID:  b929a500d68479163c48739d809cbf4c1335db6f
Gitweb:     https://git.kernel.org/tip/b929a500d68479163c48739d809cbf4c1335db6f
Author:     Matteo Croce <mcroce@...hat.com>
AuthorDate: Tue, 26 Mar 2019 21:30:46 +0100
Committer:  Borislav Petkov <bp@...e.de>
CommitDate: Wed, 27 Mar 2019 14:22:08 +0100

x86/realmode: Don't leak the trampoline kernel address

Since commit

  ad67b74d2469 ("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 and this
statement is not needed anymore.

Fixes: ad67b74d2469d9b8 ("printk: hash addresses printed with %p")
Signed-off-by: Matteo Croce <mcroce@...hat.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: x86-ml <x86@...nel.org>
Link: https://lkml.kernel.org/r/20190326203046.20787-1-mcroce@redhat.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)