Re: [PATCH AUTOSEL 5.11 50/67] Drivers: hv: vmbus: Initialize memory to be sent to the host
From: Andrea Parri
Date: Wed Feb 24 2021 - 09:51:58 EST
On Wed, Feb 24, 2021 at 02:16:00PM +0100, Andrea Parri wrote:
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On Wed, Feb 24, 2021 at 07:50:08AM -0500, Sasha Levin wrote:
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> From: "Andrea Parri (Microsoft)" <parri.andrea@xxxxxxxxx>
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> [ Upstream commit e99c4afbee07e9323e9191a20b24d74dbf815bdf ]
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> __vmbus_open() and vmbus_teardown_gpadl() do not inizialite the memory
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> for the vmbus_channel_open_channel and the vmbus_channel_gpadl_teardown
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> objects they allocate respectively. These objects contain padding bytes
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> and fields that are left uninitialized and that are later sent to the
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> host, potentially leaking guest data. Zero initialize such fields to
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> avoid leaking sensitive information to the host.
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> Reported-by: Juan Vazquez <juvazq@xxxxxxxxxxxxx>
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> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@xxxxxxxxx>
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> Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
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> Link: https://lore.kernel.org/r/20201209070827.29335-2-parri.andrea@xxxxxxxxx
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> Signed-off-by: Wei Liu <wei.liu@xxxxxxxxxx>
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> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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Sasha - This patch is one of a group of patches where a Linux guest running on
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Hyper-V will start assuming that hypervisor behavior might be malicious, and
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guards against such behavior. Because this is a new assumption, these patches
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are more properly treated as new functionality rather than as bug fixes. So I
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would propose that we *not* bring such patches back to stable branches.
For future/similar cases: I'm wondering, is there some way to annotate a patch
with "please do not bring it back"?
Thanks,
Andrea