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selinux: implement the security_uring_cmd() LSM hook

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Add a SELinux access control for the iouring IORING_OP_URING_CMD
command.  This includes the addition of a new permission in the
existing "io_uring" object class: "cmd".  The subject of the new
permission check is the domain of the process requesting access, the
object is the open file which points to the device/file that is the
target of the IORING_OP_URING_CMD operation.  A sample policy rule
is shown below:

  allow <domain> <file>:io_uring { cmd };

Cc: stable@vger.kernel.org
Fixes: ee692a21e9 ("fs,io_uring: add infrastructure for uring-cmd")
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore 2022-08-10 15:55:36 -04:00
parent 2a58401240
commit f4d653dcaa
2 changed files with 25 additions and 1 deletions
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24
security/selinux/hooks.c
View File

@ -91,6 +91,7 @@
#include <uapi/linux/mount.h>
#include <linux/fsnotify.h>
#include <linux/fanotify.h>
#include <linux/io_uring.h>
#include "avc.h"
#include "objsec.h"
@ -6987,6 +6988,28 @@ static int selinux_uring_sqpoll(void)
return avc_has_perm(&selinux_state, sid, sid,
SECCLASS_IO_URING, IO_URING__SQPOLL, NULL);
}
/**
* selinux_uring_cmd - check if IORING_OP_URING_CMD is allowed
* @ioucmd: the io_uring command structure
*
* Check to see if the current domain is allowed to execute an
* IORING_OP_URING_CMD against the device/file specified in @ioucmd.
*
*/
static int selinux_uring_cmd(struct io_uring_cmd *ioucmd)
{
struct file *file = ioucmd->file;
struct inode *inode = file_inode(file);
struct inode_security_struct *isec = selinux_inode(inode);
struct common_audit_data ad;
ad.type = LSM_AUDIT_DATA_FILE;
ad.u.file = file;
return avc_has_perm(&selinux_state, current_sid(), isec->sid,
SECCLASS_IO_URING, IO_URING__CMD, &ad);
}
#endif /* CONFIG_IO_URING */
/*
@ -7231,6 +7254,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
#ifdef CONFIG_IO_URING
LSM_HOOK_INIT(uring_override_creds, selinux_uring_override_creds),
LSM_HOOK_INIT(uring_sqpoll, selinux_uring_sqpoll),
LSM_HOOK_INIT(uring_cmd, selinux_uring_cmd),
#endif
/*

2
security/selinux/include/classmap.h
View File

@ -253,7 +253,7 @@ const struct security_class_mapping secclass_map[] = {
{ "anon_inode",
{ COMMON_FILE_PERMS, NULL } },
{ "io_uring",
{ "override_creds", "sqpoll", NULL } },
{ "override_creds", "sqpoll", "cmd", NULL } },
{ NULL }
};