grub: fs/fat: Don't error when mtime is 0

A issue was found when I run "runqemu genericx86-64 ovmf", grub failed
to boot, it's a known issue has been fixed in grub upstream, backport
the fix.

(From OE-Core rev: 51eab4bb0cae46c9c32d28986eb97badf47594b7)

Signed-off-by: Ming Liu <liu.ming50@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 71 insertions, 0 deletions

diff --git a/meta/recipes-bsp/grub/files/0001-fs-fat-Don-t-error-when-mtime-is-0.patch b/meta/recipes-bsp/grub/files/0001-fs-fat-Don-t-error-when-mtime-is-0.patch
new file mode 100644
index 0000000000..a5fbd58f46
--- /dev/null
+++ b/meta/recipes-bsp/grub/files/0001-fs-fat-Don-t-error-when-mtime-is-0.patch
@@ -0,0 +1,70 @@
+From e43f3d93b28cce852c110c7a8e40d8311bcd8bb1 Mon Sep 17 00:00:00 2001
+From: Robbie Harwood <rharwood@redhat.com>
+Date: Fri, 15 Jul 2022 16:13:02 -0400
+Subject: [PATCH] fs/fat: Don't error when mtime is 0
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+In the wild, we occasionally see valid ESPs where some file modification
+times are 0. For instance:
+
+    ├── [Dec 31  1979]  EFI
+    │   ├── [Dec 31  1979]  BOOT
+    │   │   ├── [Dec 31  1979]  BOOTX64.EFI
+    │   │   └── [Dec 31  1979]  fbx64.efi
+    │   └── [Jun 27 02:41]  fedora
+    │       ├── [Dec 31  1979]  BOOTX64.CSV
+    │       ├── [Dec 31  1979]  fonts
+    │       ├── [Mar 14 03:35]  fw
+    │       │   ├── [Mar 14 03:35]  fwupd-359c1169-abd6-4a0d-8bce-e4d4713335c1.cap
+    │       │   ├── [Mar 14 03:34]  fwupd-9d255c4b-2d88-4861-860d-7ee52ade9463.cap
+    │       │   └── [Mar 14 03:34]  fwupd-b36438d8-9128-49d2-b280-487be02d948b.cap
+    │       ├── [Dec 31  1979]  fwupdx64.efi
+    │       ├── [May 10 10:47]  grub.cfg
+    │       ├── [Jun  3 12:38]  grub.cfg.new.new
+    │       ├── [May 10 10:41]  grub.cfg.old
+    │       ├── [Jun 27 02:41]  grubenv
+    │       ├── [Dec 31  1979]  grubx64.efi
+    │       ├── [Dec 31  1979]  mmx64.efi
+    │       ├── [Dec 31  1979]  shim.efi
+    │       ├── [Dec 31  1979]  shimx64.efi
+    │       └── [Dec 31  1979]  shimx64-fedora.efi
+    └── [Dec 31  1979]  FSCK0000.REC
+
+    5 directories, 17 files
+
+This causes grub-probe failure, which in turn causes grub-mkconfig
+failure. They are valid filesystems that appear intact, and the Linux
+FAT stack is able to mount and manipulate them without complaint.
+
+The check for mtime of 0 has been present since
+20def1a3c3952982395cd7c3ea7e78638527962b (fat: support file
+modification times).
+
+Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=e43f3d93b28cce852c110c7a8e40d8311bcd8bb1]
+
+Signed-off-by: Robbie Harwood <rharwood@redhat.com>
+Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
+Signed-off-by: Ming Liu <liu.ming50@gmail.com>
+---
+ grub-core/fs/fat.c | 3 ---
+ 1 file changed, 3 deletions(-)
+
+diff --git a/grub-core/fs/fat.c b/grub-core/fs/fat.c
+index 0951b2e63..c5efed724 100644
+--- a/grub-core/fs/fat.c
++++ b/grub-core/fs/fat.c
+@@ -1027,9 +1027,6 @@ grub_fat_dir (grub_device_t device, const char *path, grub_fs_dir_hook_t hook,
+                                          grub_le_to_cpu16 (ctxt.dir.w_date),
+                                          &info.mtime);
+ #endif
+-      if (info.mtimeset == 0)
+-       grub_error (GRUB_ERR_OUT_OF_RANGE,
+-                   "invalid modification timestamp for %s", path);
+ 
+       if (hook (ctxt.filename, &info, hook_data))
+        break;
+-- 
+2.34.1
+
diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc
index f594e7d3a4..1215b24668 100644
--- a/meta/recipes-bsp/grub/grub2.inc
+++ b/meta/recipes-bsp/grub/grub2.inc
@@ -44,6 +44,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \
            file://0001-fs-ext2-Ignore-checksum-seed-incompat-feature.patch \
            file://CVE-2023-4692.patch \
            file://CVE-2023-4693.patch \
+           file://0001-fs-fat-Don-t-error-when-mtime-is-0.patch \
 "
 
 SRC_URI[sha256sum] = "23b64b4c741569f9426ed2e3d0e6780796fca081bee4c99f62aa3f53ae803f5f"