forked from Minki/linux
740b03414b
This patch implements two new io_uring access controls, specifically
support for controlling the io_uring "personalities" and
IORING_SETUP_SQPOLL. Controlling the sharing of io_urings themselves
is handled via the normal file/inode labeling and sharing mechanisms.
The io_uring { override_creds } permission restricts which domains
the subject domain can use to override it's own credentials.
Granting a domain the io_uring { override_creds } permission allows
it to impersonate another domain in io_uring operations.
The io_uring { sqpoll } permission restricts which domains can create
asynchronous io_uring polling threads. This is important from a
security perspective as operations queued by this asynchronous thread
inherit the credentials of the thread creator by default; if an
io_uring is shared across process/domain boundaries this could result
in one domain impersonating another. Controlling the creation of
sqpoll threads, and the sharing of io_urings across processes, allow
policy authors to restrict the ability of one domain to impersonate
another via io_uring.
As a quick summary, this patch adds a new object class with two
permissions:
io_uring { override_creds sqpoll }
These permissions can be seen in the two simple policy statements
below:
allow domA_t domB_t : io_uring { override_creds };
allow domA_t self : io_uring { sqpoll };
Signed-off-by: Paul Moore <paul@paul-moore.com>
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| .. | ||
| apparmor | ||
| bpf | ||
| integrity | ||
| keys | ||
| landlock | ||
| loadpin | ||
| lockdown | ||
| safesetid | ||
| selinux | ||
| smack | ||
| tomoyo | ||
| yama | ||
| commoncap.c | ||
| device_cgroup.c | ||
| inode.c | ||
| Kconfig | ||
| Kconfig.hardening | ||
| lsm_audit.c | ||
| Makefile | ||
| min_addr.c | ||
| security.c | ||