mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2025-01-01 10:42:11 +00:00
a04a119808
Create a system call lsm_get_self_attr() to provide the security
module maintained attributes of the current process.
Create a system call lsm_set_self_attr() to set a security
module maintained attribute of the current process.
Historically these attributes have been exposed to user space via
entries in procfs under /proc/self/attr.
The attribute value is provided in a lsm_ctx structure. The structure
identifies the size of the attribute, and the attribute value. The format
of the attribute value is defined by the security module. A flags field
is included for LSM specific information. It is currently unused and must
be 0. The total size of the data, including the lsm_ctx structure and any
padding, is maintained as well.
struct lsm_ctx {
__u64 id;
__u64 flags;
__u64 len;
__u64 ctx_len;
__u8 ctx[];
};
Two new LSM hooks are used to interface with the LSMs.
security_getselfattr() collects the lsm_ctx values from the
LSMs that support the hook, accounting for space requirements.
security_setselfattr() identifies which LSM the attribute is
intended for and passes it along.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* System calls implementing the Linux Security Module API.
|
|
*
|
|
* Copyright (C) 2022 Casey Schaufler <casey@schaufler-ca.com>
|
|
* Copyright (C) 2022 Intel Corporation
|
|
*/
|
|
|
|
#include <asm/current.h>
|
|
#include <linux/compiler_types.h>
|
|
#include <linux/err.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/security.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/types.h>
|
|
#include <linux/lsm_hooks.h>
|
|
#include <uapi/linux/lsm.h>
|
|
|
|
/**
|
|
* sys_lsm_set_self_attr - Set current task's security module attribute
|
|
* @attr: which attribute to set
|
|
* @ctx: the LSM contexts
|
|
* @size: size of @ctx
|
|
* @flags: reserved for future use
|
|
*
|
|
* Sets the calling task's LSM context. On success this function
|
|
* returns 0. If the attribute specified cannot be set a negative
|
|
* value indicating the reason for the error is returned.
|
|
*/
|
|
SYSCALL_DEFINE4(lsm_set_self_attr, unsigned int, attr, struct lsm_ctx __user *,
|
|
ctx, size_t, size, u32, flags)
|
|
{
|
|
return security_setselfattr(attr, ctx, size, flags);
|
|
}
|
|
|
|
/**
|
|
* sys_lsm_get_self_attr - Return current task's security module attributes
|
|
* @attr: which attribute to return
|
|
* @ctx: the user-space destination for the information, or NULL
|
|
* @size: pointer to the size of space available to receive the data
|
|
* @flags: special handling options. LSM_FLAG_SINGLE indicates that only
|
|
* attributes associated with the LSM identified in the passed @ctx be
|
|
* reported.
|
|
*
|
|
* Returns the calling task's LSM contexts. On success this
|
|
* function returns the number of @ctx array elements. This value
|
|
* may be zero if there are no LSM contexts assigned. If @size is
|
|
* insufficient to contain the return data -E2BIG is returned and
|
|
* @size is set to the minimum required size. In all other cases
|
|
* a negative value indicating the error is returned.
|
|
*/
|
|
SYSCALL_DEFINE4(lsm_get_self_attr, unsigned int, attr, struct lsm_ctx __user *,
|
|
ctx, size_t __user *, size, u32, flags)
|
|
{
|
|
return security_getselfattr(attr, ctx, size, flags);
|
|
}
|