efi/x86: Don't panic or BUG() on non-critical error conditions

[ Upstream commit e2d68a955e49d61fd0384f23e92058dc9b79be5e ]

The logic in __efi_enter_virtual_mode() does a number of steps in
sequence, all of which may fail in one way or the other. In most
cases, we simply print an error and disable EFI runtime services
support, but in some cases, we BUG() or panic() and bring down the
system when encountering conditions that we could easily handle in
the same way.

While at it, replace a pointless page-to-virt-phys conversion with
one that goes straight from struct page to physical.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Matthew Garrett <mjg59@google.com>
Cc: linux-efi@vger.kernel.org
Link: https://lkml.kernel.org/r/20200103113953.9571-14-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 5b0275310070e7dae8a9168e4e06977dbb305108..e7f19dec16b9704927681dab9c74715f32b75faa 100644 (file)
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -930,16 +930,14 @@ static void __init __efi_enter_virtual_mode(void)
 
        if (efi_alloc_page_tables()) {
                pr_err("Failed to allocate EFI page tables\n");
-               clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
-               return;
+               goto err;
        }
 
        efi_merge_regions();
        new_memmap = efi_map_regions(&count, &pg_shift);
        if (!new_memmap) {
                pr_err("Error reallocating memory, EFI runtime non-functional!\n");
-               clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
-               return;
+               goto err;
        }
 
        pa = __pa(new_memmap);
@@ -953,8 +951,7 @@ static void __init __efi_enter_virtual_mode(void)
 
        if (efi_memmap_init_late(pa, efi.memmap.desc_size * count)) {
                pr_err("Failed to remap late EFI memory map\n");
-               clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
-               return;
+               goto err;
        }
 
        if (efi_enabled(EFI_DBG)) {
@@ -962,12 +959,11 @@ static void __init __efi_enter_virtual_mode(void)
                efi_print_memmap();
        }
 
-       BUG_ON(!efi.systab);
+       if (WARN_ON(!efi.systab))
+               goto err;
 
-       if (efi_setup_page_tables(pa, 1 << pg_shift)) {
-               clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
-               return;
-       }
+       if (efi_setup_page_tables(pa, 1 << pg_shift))
+               goto err;
 
        efi_sync_low_kernel_mappings();
 
@@ -987,9 +983,9 @@ static void __init __efi_enter_virtual_mode(void)
        }
 
        if (status != EFI_SUCCESS) {
-               pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n",
-                        status);
-               panic("EFI call to SetVirtualAddressMap() failed!");
+               pr_err("Unable to switch EFI into virtual mode (status=%lx)!\n",
+                      status);
+               goto err;
        }
 
        /*
@@ -1016,6 +1012,10 @@ static void __init __efi_enter_virtual_mode(void)
 
        /* clean DUMMY object */
        efi_delete_dummy_variable();
+       return;
+
+err:
+       clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 }
 
 void __init efi_enter_virtual_mode(void)

diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index ae369c2bbc3ebbf508e7c64bd32a8a9e77950848..0ebb7f94fd518c3cff6f94ea2494ade4a098ab7b 100644 (file)
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -390,11 +390,12 @@ int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
                return 0;
 
        page = alloc_page(GFP_KERNEL|__GFP_DMA32);
-       if (!page)
-               panic("Unable to allocate EFI runtime stack < 4GB\n");
+       if (!page) {
+               pr_err("Unable to allocate EFI runtime stack < 4GB\n");
+               return 1;
+       }
 
-       efi_scratch.phys_stack = virt_to_phys(page_address(page));
-       efi_scratch.phys_stack += PAGE_SIZE; /* stack grows down */
+       efi_scratch.phys_stack = page_to_phys(page + 1); /* stack grows down */
 
        npages = (_etext - _text) >> PAGE_SHIFT;
        text = __pa(_text);