linux-kernel - [PATCH] ARM: VDSO: Don't leak kernel addresses

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Message-Id: <20190502125545.7020-1-geert+renesas@glider.be>
Date:   Thu,  2 May 2019 14:55:45 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Russell King <linux@...linux.org.uk>
Cc:     Matteo Croce <mcroce@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] ARM: VDSO: Don't leak kernel addresses

Since commit ad67b74d2469d9b8 ("printk: hash addresses printed with
%p"), an obfuscated kernel pointer is printed at every boot if
debugging is enabled:

    vdso: 1 text pages at base (____ptrval____)

Remove the print completely, as it's useless without the address.

Based on commit 0f1bf7e39822476b ("arm64/vdso: don't leak kernel
addresses").

Fixes: ad67b74d2469d9b8 ("printk: hash addresses printed with %p")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 arch/arm/kernel/vdso.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/kernel/vdso.c b/arch/arm/kernel/vdso.c
index f4dd7f9663c10a70..e8cda5e02b4ea7bd 100644
--- a/arch/arm/kernel/vdso.c
+++ b/arch/arm/kernel/vdso.c
@@ -205,7 +205,6 @@ static int __init vdso_init(void)
 	}
 
 	text_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;
-	pr_debug("vdso: %i text pages at base %p\n", text_pages, vdso_start);
 
 	/* Allocate the VDSO text pagelist */
 	vdso_text_pagelist = kcalloc(text_pages, sizeof(struct page *),
-- 
2.17.1