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path: root/drivers/nvme/host/ioctl.c
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Diffstat (limited to 'drivers/nvme/host/ioctl.c')
-rw-r--r--drivers/nvme/host/ioctl.c118
1 files changed, 85 insertions, 33 deletions
diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 81f5550b670d..9ddda571f046 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -8,6 +8,50 @@
#include <linux/io_uring.h>
#include "nvme.h"
+static bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c,
+ fmode_t mode)
+{
+ if (capable(CAP_SYS_ADMIN))
+ return true;
+
+ /*
+ * Do not allow unprivileged processes to send vendor specific or fabrics
+ * commands as we can't be sure about their effects.
+ */
+ if (c->common.opcode >= nvme_cmd_vendor_start ||
+ c->common.opcode == nvme_fabrics_command)
+ return false;
+
+ /*
+ * Do not allow unprivileged passthrough of admin commands except
+ * for a subset of identify commands that contain information required
+ * to form proper I/O commands in userspace and do not expose any
+ * potentially sensitive information.
+ */
+ if (!ns) {
+ if (c->common.opcode == nvme_admin_identify) {
+ switch (c->identify.cns) {
+ case NVME_ID_CNS_NS:
+ case NVME_ID_CNS_CS_NS:
+ case NVME_ID_CNS_NS_CS_INDEP:
+ case NVME_ID_CNS_CS_CTRL:
+ case NVME_ID_CNS_CTRL:
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /*
+ * Only allow I/O commands that transfer data to the controller if the
+ * special file is open for writing, but always allow I/O commands that
+ * transfer data from the controller.
+ */
+ if (nvme_is_write(c))
+ return mode & FMODE_WRITE;
+ return true;
+}
+
/*
* Convert integer values from ioctl structures to user pointers, silently
* ignoring the upper bits in the compat case to match behaviour of 32-bit
@@ -261,7 +305,7 @@ static bool nvme_validate_passthru_nsid(struct nvme_ctrl *ctrl,
}
static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
- struct nvme_passthru_cmd __user *ucmd)
+ struct nvme_passthru_cmd __user *ucmd, fmode_t mode)
{
struct nvme_passthru_cmd cmd;
struct nvme_command c;
@@ -269,8 +313,6 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
u64 result;
int status;
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
return -EFAULT;
if (cmd.flags)
@@ -291,6 +333,9 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
c.common.cdw14 = cpu_to_le32(cmd.cdw14);
c.common.cdw15 = cpu_to_le32(cmd.cdw15);
+ if (!nvme_cmd_allowed(ns, &c, mode))
+ return -EACCES;
+
if (cmd.timeout_ms)
timeout = msecs_to_jiffies(cmd.timeout_ms);
@@ -308,15 +353,14 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
}
static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
- struct nvme_passthru_cmd64 __user *ucmd, bool vec)
+ struct nvme_passthru_cmd64 __user *ucmd, bool vec,
+ fmode_t mode)
{
struct nvme_passthru_cmd64 cmd;
struct nvme_command c;
unsigned timeout = 0;
int status;
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
return -EFAULT;
if (cmd.flags)
@@ -337,6 +381,9 @@ static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
c.common.cdw14 = cpu_to_le32(cmd.cdw14);
c.common.cdw15 = cpu_to_le32(cmd.cdw15);
+ if (!nvme_cmd_allowed(ns, &c, mode))
+ return -EACCES;
+
if (cmd.timeout_ms)
timeout = msecs_to_jiffies(cmd.timeout_ms);
@@ -483,9 +530,6 @@ static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
void *meta = NULL;
int ret;
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
-
c.common.opcode = READ_ONCE(cmd->opcode);
c.common.flags = READ_ONCE(cmd->flags);
if (c.common.flags)
@@ -507,6 +551,9 @@ static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
c.common.cdw14 = cpu_to_le32(READ_ONCE(cmd->cdw14));
c.common.cdw15 = cpu_to_le32(READ_ONCE(cmd->cdw15));
+ if (!nvme_cmd_allowed(ns, &c, ioucmd->file->f_mode))
+ return -EACCES;
+
d.metadata = READ_ONCE(cmd->metadata);
d.addr = READ_ONCE(cmd->addr);
d.data_len = READ_ONCE(cmd->data_len);
@@ -570,13 +617,13 @@ static bool is_ctrl_ioctl(unsigned int cmd)
}
static int nvme_ctrl_ioctl(struct nvme_ctrl *ctrl, unsigned int cmd,
- void __user *argp)
+ void __user *argp, fmode_t mode)
{
switch (cmd) {
case NVME_IOCTL_ADMIN_CMD:
- return nvme_user_cmd(ctrl, NULL, argp);
+ return nvme_user_cmd(ctrl, NULL, argp, mode);
case NVME_IOCTL_ADMIN64_CMD:
- return nvme_user_cmd64(ctrl, NULL, argp, false);
+ return nvme_user_cmd64(ctrl, NULL, argp, false, mode);
default:
return sed_ioctl(ctrl->opal_dev, cmd, argp);
}
@@ -601,14 +648,14 @@ struct nvme_user_io32 {
#endif /* COMPAT_FOR_U64_ALIGNMENT */
static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd,
- void __user *argp)
+ void __user *argp, fmode_t mode)
{
switch (cmd) {
case NVME_IOCTL_ID:
force_successful_syscall_return();
return ns->head->ns_id;
case NVME_IOCTL_IO_CMD:
- return nvme_user_cmd(ns->ctrl, ns, argp);
+ return nvme_user_cmd(ns->ctrl, ns, argp, mode);
/*
* struct nvme_user_io can have different padding on some 32-bit ABIs.
* Just accept the compat version as all fields that are used are the
@@ -620,19 +667,20 @@ static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd,
case NVME_IOCTL_SUBMIT_IO:
return nvme_submit_io(ns, argp);
case NVME_IOCTL_IO64_CMD:
- return nvme_user_cmd64(ns->ctrl, ns, argp, false);
+ return nvme_user_cmd64(ns->ctrl, ns, argp, false, mode);
case NVME_IOCTL_IO64_CMD_VEC:
- return nvme_user_cmd64(ns->ctrl, ns, argp, true);
+ return nvme_user_cmd64(ns->ctrl, ns, argp, true, mode);
default:
return -ENOTTY;
}
}
-static int __nvme_ioctl(struct nvme_ns *ns, unsigned int cmd, void __user *arg)
+static int __nvme_ioctl(struct nvme_ns *ns, unsigned int cmd, void __user *arg,
+ fmode_t mode)
{
- if (is_ctrl_ioctl(cmd))
- return nvme_ctrl_ioctl(ns->ctrl, cmd, arg);
- return nvme_ns_ioctl(ns, cmd, arg);
+ if (is_ctrl_ioctl(cmd))
+ return nvme_ctrl_ioctl(ns->ctrl, cmd, arg, mode);
+ return nvme_ns_ioctl(ns, cmd, arg, mode);
}
int nvme_ioctl(struct block_device *bdev, fmode_t mode,
@@ -640,7 +688,7 @@ int nvme_ioctl(struct block_device *bdev, fmode_t mode,
{
struct nvme_ns *ns = bdev->bd_disk->private_data;
- return __nvme_ioctl(ns, cmd, (void __user *)arg);
+ return __nvme_ioctl(ns, cmd, (void __user *)arg, mode);
}
long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
@@ -648,7 +696,7 @@ long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
struct nvme_ns *ns =
container_of(file_inode(file)->i_cdev, struct nvme_ns, cdev);
- return __nvme_ioctl(ns, cmd, (void __user *)arg);
+ return __nvme_ioctl(ns, cmd, (void __user *)arg, file->f_mode);
}
static int nvme_uring_cmd_checks(unsigned int issue_flags)
@@ -716,7 +764,8 @@ int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd,
}
#ifdef CONFIG_NVME_MULTIPATH
static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
- void __user *argp, struct nvme_ns_head *head, int srcu_idx)
+ void __user *argp, struct nvme_ns_head *head, int srcu_idx,
+ fmode_t mode)
__releases(&head->srcu)
{
struct nvme_ctrl *ctrl = ns->ctrl;
@@ -724,7 +773,7 @@ static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
nvme_get_ctrl(ns->ctrl);
srcu_read_unlock(&head->srcu, srcu_idx);
- ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp);
+ ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp, mode);
nvme_put_ctrl(ctrl);
return ret;
@@ -749,9 +798,10 @@ int nvme_ns_head_ioctl(struct block_device *bdev, fmode_t mode,
* deadlock when deleting namespaces using the passthrough interface.
*/
if (is_ctrl_ioctl(cmd))
- return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx);
+ return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx,
+ mode);
- ret = nvme_ns_ioctl(ns, cmd, argp);
+ ret = nvme_ns_ioctl(ns, cmd, argp, mode);
out_unlock:
srcu_read_unlock(&head->srcu, srcu_idx);
return ret;
@@ -773,9 +823,10 @@ long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd,
goto out_unlock;
if (is_ctrl_ioctl(cmd))
- return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx);
+ return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx,
+ file->f_mode);
- ret = nvme_ns_ioctl(ns, cmd, argp);
+ ret = nvme_ns_ioctl(ns, cmd, argp, file->f_mode);
out_unlock:
srcu_read_unlock(&head->srcu, srcu_idx);
return ret;
@@ -849,7 +900,8 @@ int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags)
return ret;
}
-static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
+static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp,
+ fmode_t mode)
{
struct nvme_ns *ns;
int ret;
@@ -873,7 +925,7 @@ static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
kref_get(&ns->kref);
up_read(&ctrl->namespaces_rwsem);
- ret = nvme_user_cmd(ctrl, ns, argp);
+ ret = nvme_user_cmd(ctrl, ns, argp, mode);
nvme_put_ns(ns);
return ret;
@@ -890,11 +942,11 @@ long nvme_dev_ioctl(struct file *file, unsigned int cmd,
switch (cmd) {
case NVME_IOCTL_ADMIN_CMD:
- return nvme_user_cmd(ctrl, NULL, argp);
+ return nvme_user_cmd(ctrl, NULL, argp, file->f_mode);
case NVME_IOCTL_ADMIN64_CMD:
- return nvme_user_cmd64(ctrl, NULL, argp, false);
+ return nvme_user_cmd64(ctrl, NULL, argp, false, file->f_mode);
case NVME_IOCTL_IO_CMD:
- return nvme_dev_user_cmd(ctrl, argp);
+ return nvme_dev_user_cmd(ctrl, argp, file->f_mode);
case NVME_IOCTL_RESET:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-13 23:25:23 +0100