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Kirill A. Shutemov ef00818c50 x86/tdx: Fix data leak in mmio_read() 
commit b6fb565a2d upstream.

The mmio_read() function makes a TDVMCALL to retrieve MMIO data for an
address from the VMM.

Sean noticed that mmio_read() unintentionally exposes the value of an
initialized variable (val) on the stack to the VMM.

This variable is only needed as an output value. It did not need to be
passed to the VMM in the first place.

Do not send the original value of *val to the VMM.

[ dhansen: clarify what 'val' is used for. ]

Fixes: 31d58c4e55 ("x86/tdx: Handle in-kernel MMIO")
Reported-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc:stable@vger.kernel.org
Link: https://lore.kernel.org/all/20240826125304.1566719-1-kirill.shutemov%40linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-09-12 11:11:25 +02:00
..
tdx x86/tdx: Fix data leak in mmio_read() 2024-09-12 11:11:25 +02:00
core.c x86/coco: Require seeding RNG with RDRAND on CoCo systems 2024-04-10 16:36:03 +02:00
Makefile x86/tdx: Detect running as a TDX guest in early boot 2022-04-07 08:27:50 -07:00