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nvme: identify-namespace without CAP_SYS_ADMIN

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Allow all identify-namespace variants (CNS 00h, 05h and 08h) without
requiring CAP_SYS_ADMIN. The information (retrieved using id-ns) is
needed to form IO commands for passthrough interface.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Kanchan Joshi 2022-11-01 10:43:07 +01:00 committed by Christoph Hellwig
parent 855b7717f4
commit e4fbcf32c8
1 changed files with 16 additions and 2 deletions
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18
drivers/nvme/host/ioctl.c
View file

@ -22,9 +22,23 @@ static bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c,
c->common.opcode == nvme_fabrics_command)
return false;
/* do not allow unprivileged admin commands */
if (!ns)
/*
* 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:
return true;
}
}
return false;
}
/*
* Only allow I/O commands that transfer data to the controller if the