On 1/10/21 1:11 AM, Hyunwook (Wooky) Baek wrote:
Don't assume dest/source buffers are userspace addresses when manually copying data for string I/O or MOVS MMIO, as {get,put}_user() will fail if handed a kernel address and ultimately lead to a kernel panic.Signed-off-by: Hyunwook (Wooky) Baek <[email protected]> Acked-by: David Rientjes <[email protected]> --- This patch is tested by invoking INSB/OUTSB instructions in kernel space in a SEV-ES-enabled VM. Without the patch, the kernel crashed with the following message: "SEV-ES: Unsupported exception in #VC instruction emulation - can't continue" With the patch, the instructions successfully read/wrote the string from/to the I/O port.
Shouldn't this have a Fixes: tag? Thanks, Tom
arch/x86/kernel/sev-es.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
