virt: tdx-guest: Just leak decrypted memory on unrecoverable errors

BugLink: https://bugs.launchpad.net/bugs/2103869

commit 27834971f616c5e154423c578fa95e0444444ce1 upstream.

In CoCo VMs it is possible for the untrusted host to cause
set_memory_decrypted() to fail such that an error is returned
and the resulting memory is shared. Callers need to take care
to handle these errors to avoid returning decrypted (shared)
memory to the page allocator, which could lead to functional
or security issues.

Leak the decrypted memory when set_memory_decrypted() fails,
and don't need to print an error since set_memory_decrypted()
will call WARN_ONCE().

Fixes: f4738f56d1 ("virt: tdx-guest: Add Quote generation support using TSM_REPORTS")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20240619111801.25630-1-lirongqing%40baidu.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CVE-2024-57793
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Mehmet Basaran <mehmet.basaran@canonical.com>

This commit is contained in:

Li RongQing

2024-06-19 19:18:01 +08:00

committed by

Mehmet Basaran

parent b65dce7a85

commit 946952f0e7

1 changed files with 1 additions and 3 deletions

									
										drivers/virt/coco/tdx-guest/tdx-guest.c
									
		+1
		-3
	
												View File
												
				@@ -124,10 +124,8 @@ static void *alloc_quote_buf(void)

					if (!addr)

						return NULL;

					if (set_memory_decrypted((unsigned long)addr, count)) {

						free_pages_exact(addr, len);

					if (set_memory_decrypted((unsigned long)addr, count))

						return NULL;

					}

					return addr;

				}