linux-kernel - [PATCH] arm64/vdso: don't leak kernel addresses

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Message-Id: <20190330184638.16219-1-mcroce@redhat.com>
Date:   Sat, 30 Mar 2019 19:46:38 +0100
From:   Matteo Croce <mcroce@...hat.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Subject: [PATCH] arm64/vdso: don't leak kernel addresses

Since commit ad67b74d2469d9b8 ("printk: hash addresses printed with %p"),
two obfuscated kernel pointer are printed at every boot:

    vdso: 2 pages (1 code @ (____ptrval____), 1 data @ (____ptrval____))

Remove the addresses from the print, which turns into a more discrete:

    vdso: 2 pages (1 code, 1 data)

Fixes: ad67b74d2469d9b8 ("printk: hash addresses printed with %p")
Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
 arch/arm64/kernel/vdso.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c
index 2d419006ad43..fdfee0ef5bc5 100644
--- a/arch/arm64/kernel/vdso.c
+++ b/arch/arm64/kernel/vdso.c
@@ -146,8 +146,8 @@ static int __init vdso_init(void)
 	}
 
 	vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;
-	pr_info("vdso: %ld pages (%ld code @ %p, %ld data @ %p)\n",
-		vdso_pages + 1, vdso_pages, vdso_start, 1L, vdso_data);
+	pr_info("vdso: %ld pages (%ld code, %ld data)\n",
+		vdso_pages + 1, vdso_pages, 1L);
 
 	/* Allocate the vDSO pagelist, plus a page for the data. */
 	vdso_pagelist = kcalloc(vdso_pages + 1, sizeof(struct page *),
-- 
2.19.1