File shim-bsc1175509-more-tpm-fixes.patch of Package shim-susesigned.16842
From 3574fb71d1849295f662c3fcf0818bcd40373649 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Tue, 18 Feb 2020 12:03:28 +0100
Subject: [PATCH 1/3] shim: Update EFI_LOADED_IMAGE with the second stage
loader file path
When shim loads the second stage loader (e.g: GRUB) the FilePath field of
the EFI_LOADED_IMAGE structure isn't updated with the path of the loaded
binary. So it still contains the file path of the shim binary.
This isn't a problem since the file path is currently not used. But should
be used to set the DevicePath field of the EFI_IMAGE_LOAD_EVENT structure
that is logged when measuring the PE/COFF binaries. In that case the TPM
Event Log will have an incorrect file path for the measured binary, i.e:
$ hexdump -Cv /sys/kernel/security/tpm0/binary_bios_measurements
...
00000a50 00 00 00 00 00 00 04 04 34 00 5c 00 45 00 46 00 |........4.\.E.F.|
00000a60 49 00 5c 00 72 00 65 00 64 00 68 00 61 00 74 00 |I.\.r.e.d.h.a.t.|
00000a70 5c 00 73 00 68 00 69 00 6d 00 78 00 36 00 34 00 |\.s.h.i.m.x.6.4.|
00000a80 2e 00 65 00 66 00 69 00 00 00 7f ff 04 00 00 00 |..e.f.i.........|
00000a90 00 00 00 00 00 00 af 08 00 00 00 0d 00 00 00 b5 |................|
00000aa0 cd d0 8f bb 16 31 e2 80 8b e8 58 75 c9 89 18 95 |.....1....Xu....|
00000ab0 d2 de 15 15 00 00 00 67 72 75 62 5f 63 6d 64 20 |.......grub_cmd |
00000ac0 73 65 74 20 70 61 67 65 72 3d 31 00 08 00 00 00 |set pager=1.....|
...
So update the EFI_LOADED_IMAGE structure with the second stage loader file
path to have the correct value in the log, i.e:
$ hexdump -Cv /sys/kernel/security/tpm0/binary_bios_measurements
...
00000a50 00 00 00 00 00 00 04 04 34 00 5c 00 45 00 46 00 |........4.\.E.F.|
00000a60 49 00 5c 00 72 00 65 00 64 00 68 00 61 00 74 00 |I.\.r.e.d.h.a.t.|
00000a70 5c 00 67 00 72 00 75 00 62 00 78 00 36 00 34 00 |\.g.r.u.b.x.6.4.|
00000a80 2e 00 65 00 66 00 69 00 00 00 7f ff 04 00 00 00 |..e.f.i.........|
00000a90 00 00 00 00 00 00 af 08 00 00 00 0d 00 00 00 b5 |................|
00000aa0 cd d0 8f bb 16 31 e2 80 8b e8 58 75 c9 89 18 95 |.....1....Xu....|
00000ab0 d2 de 15 15 00 00 00 67 72 75 62 5f 63 6d 64 20 |.......grub_cmd |
00000ac0 73 65 74 20 70 61 67 65 72 3d 31 00 08 00 00 00 |set pager=1.....|
...
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
(cherry picked from commit cd7d42d493d2913625b9852743db99d97ad15c72)
---
shim.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/shim.c b/shim.c
index ebc46f0..1dff8a4 100644
--- a/shim.c
+++ b/shim.c
@@ -1950,6 +1950,16 @@ EFI_STATUS start_image(EFI_HANDLE image_handle, CHAR16 *ImagePath)
*/
CopyMem(&li_bak, li, sizeof(li_bak));
+ /*
+ * Update the loaded image with the second stage loader file path
+ */
+ li->FilePath = FileDevicePath(NULL, PathName);
+ if (!li->FilePath) {
+ perror(L"Unable to update loaded image file path\n");
+ efi_status = EFI_OUT_OF_RESOURCES;
+ goto restore;
+ }
+
/*
* Verify and, if appropriate, relocate and execute the executable
*/
@@ -1959,8 +1969,7 @@ EFI_STATUS start_image(EFI_HANDLE image_handle, CHAR16 *ImagePath)
perror(L"Failed to load image: %r\n", efi_status);
PrintErrors();
ClearErrors();
- CopyMem(li, &li_bak, sizeof(li_bak));
- goto done;
+ goto restore;
}
loader_is_participating = 0;
@@ -1970,6 +1979,10 @@ EFI_STATUS start_image(EFI_HANDLE image_handle, CHAR16 *ImagePath)
*/
efi_status = entry_point(image_handle, systab);
+restore:
+ if (li->FilePath)
+ FreePool(li->FilePath);
+
/*
* Restore our original loaded image values
*/
--
2.28.0
From eee96f1c59ba0f1a58eb1748a4bdf7ed0855b17a Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Tue, 18 Feb 2020 12:03:17 +0100
Subject: [PATCH 2/3] tpm: Include information about PE/COFF images in the TPM
Event Log
The "TCG PC Client Specific Platform Firmware Profile Specification" says
that when measuring a PE/COFF image, the TCG_PCR_EVENT2 structure Event
field MUST contain a UEFI_IMAGE_LOAD_EVENT structure.
Currently an empty UEFI_IMAGE_LOAD_EVENT structure is passed so users only
have the hash of the PE/COFF image, but not information such the file path
of the binary.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
(cherry picked from commit c252b9ee94c342f9074a3e9064fd254eef203a63)
---
include/tpm.h | 5 +++--
shim.c | 7 +++++--
tpm.c | 46 ++++++++++++++++++++++++++++++++--------------
3 files changed, 40 insertions(+), 18 deletions(-)
diff --git a/include/tpm.h b/include/tpm.h
index 746e871..a05c249 100644
--- a/include/tpm.h
+++ b/include/tpm.h
@@ -10,8 +10,9 @@ EFI_STATUS tpm_log_event(EFI_PHYSICAL_ADDRESS buf, UINTN size, UINT8 pcr,
const CHAR8 *description);
EFI_STATUS fallback_should_prefer_reset(void);
-EFI_STATUS tpm_log_pe(EFI_PHYSICAL_ADDRESS buf, UINTN size, UINT8 *sha1hash,
- UINT8 pcr);
+EFI_STATUS tpm_log_pe(EFI_PHYSICAL_ADDRESS buf, UINTN size,
+ EFI_PHYSICAL_ADDRESS addr, EFI_DEVICE_PATH *path,
+ UINT8 *sha1hash, UINT8 pcr);
EFI_STATUS tpm_measure_variable(CHAR16 *dbname, EFI_GUID guid, UINTN size, void *data);
diff --git a/shim.c b/shim.c
index 1dff8a4..6ce30a0 100644
--- a/shim.c
+++ b/shim.c
@@ -1299,7 +1299,9 @@ static EFI_STATUS handle_image (void *data, unsigned int datasize,
#ifdef REQUIRE_TPM
efi_status =
#endif
- tpm_log_pe((EFI_PHYSICAL_ADDRESS)(UINTN)data, datasize, sha1hash, 4);
+ tpm_log_pe((EFI_PHYSICAL_ADDRESS)(UINTN)data, datasize,
+ (EFI_PHYSICAL_ADDRESS)(UINTN)context.ImageAddress,
+ li->FilePath, sha1hash, 4);
#ifdef REQUIRE_TPM
if (efi_status != EFI_SUCCESS) {
return efi_status;
@@ -1813,7 +1815,8 @@ EFI_STATUS shim_verify (void *buffer, UINT32 size)
#ifdef REQUIRE_TPM
efi_status =
#endif
- tpm_log_pe((EFI_PHYSICAL_ADDRESS)(UINTN)buffer, size, sha1hash, 4);
+ tpm_log_pe((EFI_PHYSICAL_ADDRESS)(UINTN)buffer, size, 0, NULL,
+ sha1hash, 4);
#ifdef REQUIRE_TPM
if (EFI_ERROR(efi_status))
goto done;
diff --git a/tpm.c b/tpm.c
index 196b93c..22ad148 100644
--- a/tpm.c
+++ b/tpm.c
@@ -210,21 +210,39 @@ EFI_STATUS tpm_log_event(EFI_PHYSICAL_ADDRESS buf, UINTN size, UINT8 pcr,
strlen(description) + 1, 0xd, NULL);
}
-EFI_STATUS tpm_log_pe(EFI_PHYSICAL_ADDRESS buf, UINTN size, UINT8 *sha1hash,
- UINT8 pcr)
+EFI_STATUS tpm_log_pe(EFI_PHYSICAL_ADDRESS buf, UINTN size,
+ EFI_PHYSICAL_ADDRESS addr, EFI_DEVICE_PATH *path,
+ UINT8 *sha1hash, UINT8 pcr)
{
- EFI_IMAGE_LOAD_EVENT ImageLoad;
-
- // All of this is informational and forces us to do more parsing before
- // we can generate it, so let's just leave it out for now
- ImageLoad.ImageLocationInMemory = 0;
- ImageLoad.ImageLengthInMemory = 0;
- ImageLoad.ImageLinkTimeAddress = 0;
- ImageLoad.LengthOfDevicePath = 0;
-
- return tpm_log_event_raw(buf, size, pcr, (CHAR8 *)&ImageLoad,
- sizeof(ImageLoad),
- EV_EFI_BOOT_SERVICES_APPLICATION, sha1hash);
+ EFI_IMAGE_LOAD_EVENT *ImageLoad = NULL;
+ EFI_STATUS efi_status;
+ UINTN path_size = 0;
+
+ if (path)
+ path_size = DevicePathSize(path);
+
+ ImageLoad = AllocateZeroPool(sizeof(*ImageLoad) + path_size);
+ if (!ImageLoad) {
+ perror(L"Unable to allocate image load event structure\n");
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ ImageLoad->ImageLocationInMemory = buf;
+ ImageLoad->ImageLengthInMemory = size;
+ ImageLoad->ImageLinkTimeAddress = addr;
+
+ if (path_size > 0) {
+ CopyMem(ImageLoad->DevicePath, path, path_size);
+ ImageLoad->LengthOfDevicePath = path_size;
+ }
+
+ efi_status = tpm_log_event_raw(buf, size, pcr, (CHAR8 *)ImageLoad,
+ sizeof(*ImageLoad) + path_size,
+ EV_EFI_BOOT_SERVICES_APPLICATION,
+ sha1hash);
+ FreePool(ImageLoad);
+
+ return efi_status;
}
typedef struct {
--
2.28.0
From 537851177b72328b76f74782709029cff466168b Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Thu, 23 Jul 2020 20:35:56 -0400
Subject: [PATCH 3/3] Fix a broken tpm type
Signed-off-by: Peter Jones <pjones@redhat.com>
(cherry picked from commit 871cfcf8bdc4f656642993d38b06e4e2d5be0c18)
---
tpm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tpm.c b/tpm.c
index 22ad148..03cf3a1 100644
--- a/tpm.c
+++ b/tpm.c
@@ -239,7 +239,7 @@ EFI_STATUS tpm_log_pe(EFI_PHYSICAL_ADDRESS buf, UINTN size,
efi_status = tpm_log_event_raw(buf, size, pcr, (CHAR8 *)ImageLoad,
sizeof(*ImageLoad) + path_size,
EV_EFI_BOOT_SERVICES_APPLICATION,
- sha1hash);
+ (CHAR8 *)sha1hash);
FreePool(ImageLoad);
return efi_status;
--
2.28.0
