mirror of
https://github.com/torvalds/linux.git
synced 2024-11-21 11:35:45 +00:00
a5a858f622
Change the size parameters in lsm_list_modules(), lsm_set_self_attr() and lsm_get_self_attr() from size_t to u32. This avoids the need to have different interfaces for 32 and 64 bit systems. Cc: stable@vger.kernel.org Fixes:a04a119808("LSM: syscalls for current process attributes") Fixes:ad4aff9ec2("LSM: Create lsm_list_modules system call") Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Reported-and-reviewed-by: Dmitry V. Levin <ldv@strace.io> [PM: subject and metadata tweaks, syscall.h fixes] Signed-off-by: Paul Moore <paul@paul-moore.com>
121 lines
3.6 KiB
C
121 lines
3.6 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>
|
|
|
|
/**
|
|
* lsm_name_to_attr - map an LSM attribute name to its ID
|
|
* @name: name of the attribute
|
|
*
|
|
* Returns the LSM attribute value associated with @name, or 0 if
|
|
* there is no mapping.
|
|
*/
|
|
u64 lsm_name_to_attr(const char *name)
|
|
{
|
|
if (!strcmp(name, "current"))
|
|
return LSM_ATTR_CURRENT;
|
|
if (!strcmp(name, "exec"))
|
|
return LSM_ATTR_EXEC;
|
|
if (!strcmp(name, "fscreate"))
|
|
return LSM_ATTR_FSCREATE;
|
|
if (!strcmp(name, "keycreate"))
|
|
return LSM_ATTR_KEYCREATE;
|
|
if (!strcmp(name, "prev"))
|
|
return LSM_ATTR_PREV;
|
|
if (!strcmp(name, "sockcreate"))
|
|
return LSM_ATTR_SOCKCREATE;
|
|
return LSM_ATTR_UNDEF;
|
|
}
|
|
|
|
/**
|
|
* 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, u32, 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, u32 __user *, size, u32, flags)
|
|
{
|
|
return security_getselfattr(attr, ctx, size, flags);
|
|
}
|
|
|
|
/**
|
|
* sys_lsm_list_modules - Return a list of the active security modules
|
|
* @ids: the LSM module ids
|
|
* @size: pointer to size of @ids, updated on return
|
|
* @flags: reserved for future use, must be zero
|
|
*
|
|
* Returns a list of the active LSM ids. On success this function
|
|
* returns the number of @ids array elements. This value may be zero
|
|
* if there are no LSMs active. 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_DEFINE3(lsm_list_modules, u64 __user *, ids, u32 __user *, size,
|
|
u32, flags)
|
|
{
|
|
u32 total_size = lsm_active_cnt * sizeof(*ids);
|
|
u32 usize;
|
|
int i;
|
|
|
|
if (flags)
|
|
return -EINVAL;
|
|
|
|
if (get_user(usize, size))
|
|
return -EFAULT;
|
|
|
|
if (put_user(total_size, size) != 0)
|
|
return -EFAULT;
|
|
|
|
if (usize < total_size)
|
|
return -E2BIG;
|
|
|
|
for (i = 0; i < lsm_active_cnt; i++)
|
|
if (put_user(lsm_idlist[i]->id, ids++))
|
|
return -EFAULT;
|
|
|
|
return lsm_active_cnt;
|
|
}
|