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kdumpctl: claim that kdump does not support secure boot when service start

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Kdump does not support secure boot yet, so let's claim it is not supported
at the begginning of service start function.

In this patch for checking secure boot status I'm checking the efivars per
suggestion from pjones. see in code comments for the details.

Tested in Fedora 19 + qemu ovmf with secure boot enabled.

Signed-off-by: Dave Young <dyoung@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
This commit is contained in:
Dave Young 2014-02-12 10:31:41 +08:00 committed by WANG Chao
parent 1060846036
commit afff4dc8a3
1 changed files with 43 additions and 0 deletions
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43
kdumpctl
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@ -500,6 +500,43 @@ selinux_relabel()
done
}
# Check if secure boot is being enforced.
#
# Per Peter Jones, we need check efivar SecureBoot-$(the UUID) and
# SetupMode-$(the UUID), they are both 5 bytes binary data. The first four
# bytes are the attributes associated with the variable and can safely be
# ignored, the last bytes are one-byte true-or-false variables. If SecureBoot
# is 1 and SetupMode is 0, then secure boot is being enforced.
#
# Assume efivars is mounted at /sys/firmware/efi/efivars.
function is_secure_boot_enforced()
{
local secure_boot_file setup_mode_file
local secure_boot_byte setup_mode_byte
secure_boot_file=$(find /sys/firmware/efi/efivars -name SecureBoot-* 2>/dev/null)
setup_mode_file=$(find /sys/firmware/efi/efivars -name SetupMode-* 2>/dev/null)
if [ -f "$secure_boot_file" ] && [ -f "$setup_mode_file" ]; then
secure_boot_byte=$(hexdump -v -e '/1 "%d\ "' $secure_boot_file|cut -d' ' -f 5)
setup_mode_byte=$(hexdump -v -e '/1 "%d\ "' $setup_mode_file|cut -d' ' -f 5)
if [ "$secure_boot_byte" = "1" ] && [ "$setup_mode_byte" = "0" ]; then
return 0
fi
fi
return 1
}
function check_kdump_feasibility()
{
if is_secure_boot_enforced; then
echo "Secure Boot is Enabled. Kdump service can't be started. Disable Secure Boot and retry"
return 1;
fi
}
function start()
{
check_config
@ -517,6 +554,12 @@ function start()
return 1
fi
check_kdump_feasibility
if [ $? -ne 0 ]; then
echo "Starting kdump: [FAILED]"
return 1
fi
status
rc=$?
if [ $rc == 2 ]; then