34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
From aaa3e9152f27f6cd83c074d7dc99e79897ac8c20 Mon Sep 17 00:00:00 2001
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From: Dan Rosenberg <drosenberg@vsecurity.com>
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Date: Wed, 15 Sep 2010 19:08:24 -0400
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Subject: [PATCH] drivers/video/via/ioctl.c: prevent reading uninitialized stack memory
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The VIAFB_GET_INFO device ioctl allows unprivileged users to read 246
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bytes of uninitialized stack memory, because the "reserved" member of
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the viafb_ioctl_info struct declared on the stack is not altered or
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zeroed before being copied back to the user. This patch takes care of
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it.
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Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
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Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
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---
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drivers/video/via/ioctl.c | 2 ++
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1 files changed, 2 insertions(+), 0 deletions(-)
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diff --git a/drivers/video/via/ioctl.c b/drivers/video/via/ioctl.c
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index da03c07..4d553d0 100644
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--- a/drivers/video/via/ioctl.c
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+++ b/drivers/video/via/ioctl.c
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@@ -25,6 +25,8 @@ int viafb_ioctl_get_viafb_info(u_long arg)
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{
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struct viafb_ioctl_info viainfo;
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+ memset(&viainfo, 0, sizeof(struct viafb_ioctl_info));
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+
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viainfo.viafb_id = VIAID;
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viainfo.vendor_id = PCI_VIA_VENDOR_ID;
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--
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1.7.3.2
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