From: David Howells Date: Wed, 5 Apr 2017 17:40:31 +0100 Subject: [59/62] scsi: Lock down the eata driver Origin: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit?id=e6fc4e593143fbbb8b83c558bb8e6445d9aaa45a When the kernel is running in secure boot mode, we lock down the kernel to prevent userspace from modifying the running kernel image. Whilst this includes prohibiting access to things like /dev/mem, it must also prevent access by means of configuring driver modules in such a way as to cause a device to access or modify the kernel image. The eata driver takes a single string parameter that contains a slew of settings, including hardware resource configuration. Prohibit use of the parameter if the kernel is locked down. Suggested-by: Alan Cox Signed-off-by: David Howells cc: Dario Ballabio cc: "James E.J. Bottomley" cc: "Martin K. Petersen" cc: linux-scsi@vger.kernel.org --- drivers/scsi/eata.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c index 227dd2c2ec2f..5c036d10c18b 100644 --- a/drivers/scsi/eata.c +++ b/drivers/scsi/eata.c @@ -1552,8 +1552,13 @@ static int eata2x_detect(struct scsi_host_template *tpnt) tpnt->proc_name = "eata2x"; - if (strlen(boot_options)) + if (strlen(boot_options)) { + if (kernel_is_locked_down()) { + pr_err("Command line-specified device addresses, irqs and dma channels are not permitted when the kernel is locked down\n"); + return -EPERM; + } option_setup(boot_options); + } #if defined(MODULE) /* io_port could have been modified when loading as a module */