diff options
| -rw-r--r-- | drivers/nvme/host/ioctl.c | 28 | ||||
| -rw-r--r-- | include/linux/nvme.h | 1 |
2 files changed, 25 insertions, 4 deletions
diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c index 9ddda571f046..a8639919237e 100644 --- a/drivers/nvme/host/ioctl.c +++ b/drivers/nvme/host/ioctl.c @@ -11,6 +11,8 @@ static bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c, fmode_t mode) { + u32 effects; + if (capable(CAP_SYS_ADMIN)) return true; @@ -43,11 +45,29 @@ static bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c, } /* - * 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. + * Check if the controller provides a Commands Supported and Effects log + * and marks this command as supported. If not reject unprivileged + * passthrough. + */ + effects = nvme_command_effects(ns->ctrl, ns, c->common.opcode); + if (!(effects & NVME_CMD_EFFECTS_CSUPP)) + return false; + + /* + * Don't allow passthrough for command that have intrusive (or unknown) + * effects. + */ + if (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC | + NVME_CMD_EFFECTS_UUID_SEL | + NVME_CMD_EFFECTS_SCOPE_MASK)) + return false; + + /* + * Only allow I/O commands that transfer data to the controller or that + * change the logical block contents if the file descriptor is open for + * writing. */ - if (nvme_is_write(c)) + if (nvme_is_write(c) || (effects & NVME_CMD_EFFECTS_LBCC)) return mode & FMODE_WRITE; return true; } diff --git a/include/linux/nvme.h b/include/linux/nvme.h index d1cd53f2b6ab..4fad4aa245fb 100644 --- a/include/linux/nvme.h +++ b/include/linux/nvme.h @@ -642,6 +642,7 @@ enum { NVME_CMD_EFFECTS_CCC = 1 << 4, NVME_CMD_EFFECTS_CSE_MASK = GENMASK(18, 16), NVME_CMD_EFFECTS_UUID_SEL = 1 << 19, + NVME_CMD_EFFECTS_SCOPE_MASK = GENMASK(31, 20), }; struct nvme_effects_log { |