Alexey Gladkov (Intel) 4c0c5dcb54 x86/tdx: Fix "in-kernel MMIO" check ... commit d4fc4d01471528da8a9797a065982e05090e1d81 upstream. TDX only supports kernel-initiated MMIO operations. The handle_mmio() function checks if the #VE exception occurred in the kernel and rejects the operation if it did not. However, userspace can deceive the kernel into performing MMIO on its behalf. For example, if userspace can point a syscall to an MMIO address, syscall does get_user() or put_user() on it, triggering MMIO #VE. The kernel will treat the #VE as in-kernel MMIO. Ensure that the target MMIO address is within the kernel before decoding instruction. Fixes: 31d58c4e55 ("x86/tdx: Handle in-kernel MMIO") Signed-off-by: Alexey Gladkov (Intel) <legion@kernel.org> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Cc:stable@vger.kernel.org Link: https://lore.kernel.org/all/565a804b80387970460a4ebc67c88d1380f61ad1.1726237595.git.legion%40kernel.org Signed-off-by: Alexey Gladkov (Intel) <legion@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-10-04 16:30:05 +02:00
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tdx	x86/tdx: Fix "in-kernel MMIO" check	2024-10-04 16:30:05 +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