From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Robbie Harwood <rharwood@redhat.com>
Date: Fri, 15 Jul 2022 15:42:41 -0400
Subject: [PATCH] fs/fat: don't error when mtime is 0
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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").
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
(cherry picked from commit 0615c4887352e32d7bb7198e9ad0d695f9dc2c31)
---
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 dd82e4ee35..ff6200c5be 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;