Ubuntu
linux package

  1. Bug #1896119
  2. Comment #1

Comment 1 for bug 1896119

Revision history for this message
Fabio Augusto Miranda Martins (fabio.martins) wrote : Re: secure boot test locks machine up

Attempting to run:
cat /sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c
hangs.

hexdump barfs:
$ hexdump /sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c
hexdump: /sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c: Interrupted system call

Trying under sudo makes no difference.

stracing that cat request results in:
fstat(1, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
openat(AT_FDCWD, "/sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=5, ...}) = 0
fadvise64(3, 0, 0, POSIX_FADV_SEQUENTIAL) = 0
mmap(NULL, 139264, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd9ca513000
read(3, 0x7fd9ca514000, 131072) = -1 EINTR (Interrupted system call)
read(3, 0x7fd9ca514000, 131072) = -1 EINTR (Interrupted system call)
read(3, 0x7fd9ca514000, 131072) = -1 EINTR (Interrupted system call)
read(3, 0x7fd9ca514000, 131072) = -1 EINTR (Interrupted system call)

With that Interrupted system call just spinning repeating over and over until I stop it.