Ah:
commit 336af6a4686d885a067ecea8c3c3dd129ba4fc75 (refs/bisect/bad)
Author: Michael Schaller <[email protected]>
Date: Fri Sep 25 09:45:02 2020 +0200
efivarfs: Replace invalid slashes with exclamation marks in dentries.
Without this patch efivarfs_alloc_dentry creates dentries with slashes in
their name if the respective EFI variable has slashes in its name. This in
turn causes EIO on getdents64, which prevents a complete directory listing
of /sys/firmware/efi/efivars/.
This patch replaces the invalid shlashes with exclamation marks like
kobject_set_name_vargs does for /sys/firmware/efi/vars/ to have consistently
named dentries under /sys/firmware/efi/vars/ and /sys/firmware/efi/efivars/.
Signed-off-by: Michael Schaller <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ard Biesheuvel <[email protected]>
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https://bugs.launchpad.net/bugs/1899993
Title:
EFI: Fails when BootCurrent entry does not exist
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