From 07accfa9d1a8bac8262f6d24a94a54d2d1f35149 Mon Sep 17 00:00:00 2001 From: Jerry Hoemann Date: Wed, 6 Jan 2016 16:03:41 -0700 Subject: [PATCH] libnvdimm: Fix security issue with DSM IOCTL. Code attempts to prevent certain IOCTL DSM from being called when device is opened read only. This security feature can be trivially overcome by changing the size portion of the ioctl_command which isn't used. Check only the _IOC_NR (i.e. the command). Cc: Signed-off-by: Jerry Hoemann Signed-off-by: Dan Williams --- drivers/nvdimm/bus.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c index f85227a5ee28..2e9ac22595ec 100644 --- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -547,10 +547,10 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, /* fail write commands (when read-only) */ if (read_only) - switch (ioctl_cmd) { - case ND_IOCTL_VENDOR: - case ND_IOCTL_SET_CONFIG_DATA: - case ND_IOCTL_ARS_START: + switch (cmd) { + case ND_CMD_VENDOR: + case ND_CMD_SET_CONFIG_DATA: + case ND_CMD_ARS_START: dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n", nvdimm ? nvdimm_cmd_name(cmd) : nvdimm_bus_cmd_name(cmd)); -- 2.20.1