[PATCH AUTOSEL 4.19 506/671] ARM: 8896/1: VDSO: Don't leak kernel addresses

Sasha Levin sashal at kernel.org
Thu Jan 16 09:02:24 PST 2020


From: Geert Uytterhoeven <geert at linux-m68k.org>

[ Upstream commit 3e07590e7248db951fed6a2039403b5a39010be7 ]

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 at glider.be>
Signed-off-by: Russell King <rmk+kernel at armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 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 f4dd7f9663c1..e8cda5e02b4e 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 *),
-- 
2.20.1




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