From: David Howells Date: Wed, 8 Nov 2017 15:11:35 +0000 Subject: [19/29] scsi: Lock down the eata driver Origin: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit?id=54aab7f5b0e4e6f68cec46d92c37e6c482b5e56e 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 | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c index 6501c330d8c8..72fceaa8f3da 100644 --- a/drivers/scsi/eata.c +++ b/drivers/scsi/eata.c @@ -1552,8 +1552,11 @@ 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("Command line-specified device addresses, irqs and dma channels")) + return -EPERM; option_setup(boot_options); + } #if defined(MODULE) /* io_port could have been modified when loading as a module */