[Bug 2034705] Re: efivar fails to read variables

[Heinrich Schuchardt]

The problem is due to the kernel not supporting the deprecated statfs()
call on the efivarfs file system.

To demonstrate this I have created the following program (statfs.c):

#include <sys/vfs.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
        struct statfs s;
        int ret;

        if (argc < 2) {
                printf("usage: %s <dirpath>\n", argv[0]);
                return 1;
        }

        ret = statfs(argv[1], &s);
        if (ret == -1) {
                perror("statfs");
                return 1;
        } else {
                printf("%s type: 0x%llx\n", argv[1],
                       (unsigned long long)s.f_type);
        }
        return 0;
}

When I run it I get the following output:

$ ./statfs /sys/firmware/efi
/sys/firmware/efi type: 0x62656572
$ ./statfs /sys/firmware/efi/efivars/
statfs: Invalid argument
$ mount | grep efivarfs
efivarfs on /sys/firmware/efi/efivars type efivarfs (ro,nosuid,nodev,noexec,relatime)

Though efivarfs is mounted on /sys/firmware/efi/efivars the statfs call
fails.


** Also affects: linux-meta-riscv (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2034705

Title:
  efivar fails to read variables

Status in efivar package in Ubuntu:
  New
Status in linux-meta-riscv package in Ubuntu:
  New

Bug description:
  On riscv64 StarFive VisionFive 2 with U-Boot v2023.10-rc4 and kernel
  6.5.0-2-generic we see this output:

  
  root at ubuntu-server:/var# ls /sys/firmware/efi/efivars/
  AuditMode-8be4df61-93ca-11d2-aa0d-00e098032b8c
  DeployedMode-8be4df61-93ca-11d2-aa0d-00e098032b8c
  OsIndicationsSupported-8be4df61-93ca-11d2-aa0d-00e098032b8c
  PlatformLang-8be4df61-93ca-11d2-aa0d-00e098032b8c
  PlatformLangCodes-8be4df61-93ca-11d2-aa0d-00e098032b8c
  SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c
  SetupMode-8be4df61-93ca-11d2-aa0d-00e098032b8c
  VendorKeys-8be4df61-93ca-11d2-aa0d-00e098032b8c

  root at ubuntu-server:/var# efivar -l
  efivar: error listing variables: Function not implemented

  root at ubuntu-server:/var# efibootmgr -v
  EFI variables are not supported on this system.

  Expected behavior would be to display the variables.

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