forked from mirrors/linux
88527790c0
Since optimisitic decrypt may add extra load in case of retries require socket owner to explicitly opt-in. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (c) 2020 Christoph Hellwig.
|
|
*
|
|
* Support for "universal" pointers that can point to either kernel or userspace
|
|
* memory.
|
|
*/
|
|
#ifndef _LINUX_SOCKPTR_H
|
|
#define _LINUX_SOCKPTR_H
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
typedef struct {
|
|
union {
|
|
void *kernel;
|
|
void __user *user;
|
|
};
|
|
bool is_kernel : 1;
|
|
} sockptr_t;
|
|
|
|
static inline bool sockptr_is_kernel(sockptr_t sockptr)
|
|
{
|
|
return sockptr.is_kernel;
|
|
}
|
|
|
|
static inline sockptr_t KERNEL_SOCKPTR(void *p)
|
|
{
|
|
return (sockptr_t) { .kernel = p, .is_kernel = true };
|
|
}
|
|
|
|
static inline sockptr_t USER_SOCKPTR(void __user *p)
|
|
{
|
|
return (sockptr_t) { .user = p };
|
|
}
|
|
|
|
static inline bool sockptr_is_null(sockptr_t sockptr)
|
|
{
|
|
if (sockptr_is_kernel(sockptr))
|
|
return !sockptr.kernel;
|
|
return !sockptr.user;
|
|
}
|
|
|
|
static inline int copy_from_sockptr_offset(void *dst, sockptr_t src,
|
|
size_t offset, size_t size)
|
|
{
|
|
if (!sockptr_is_kernel(src))
|
|
return copy_from_user(dst, src.user + offset, size);
|
|
memcpy(dst, src.kernel + offset, size);
|
|
return 0;
|
|
}
|
|
|
|
static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
|
|
{
|
|
return copy_from_sockptr_offset(dst, src, 0, size);
|
|
}
|
|
|
|
static inline int copy_to_sockptr_offset(sockptr_t dst, size_t offset,
|
|
const void *src, size_t size)
|
|
{
|
|
if (!sockptr_is_kernel(dst))
|
|
return copy_to_user(dst.user + offset, src, size);
|
|
memcpy(dst.kernel + offset, src, size);
|
|
return 0;
|
|
}
|
|
|
|
static inline void *memdup_sockptr(sockptr_t src, size_t len)
|
|
{
|
|
void *p = kmalloc_track_caller(len, GFP_USER | __GFP_NOWARN);
|
|
|
|
if (!p)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (copy_from_sockptr(p, src, len)) {
|
|
kfree(p);
|
|
return ERR_PTR(-EFAULT);
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static inline void *memdup_sockptr_nul(sockptr_t src, size_t len)
|
|
{
|
|
char *p = kmalloc_track_caller(len + 1, GFP_KERNEL);
|
|
|
|
if (!p)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (copy_from_sockptr(p, src, len)) {
|
|
kfree(p);
|
|
return ERR_PTR(-EFAULT);
|
|
}
|
|
p[len] = '\0';
|
|
return p;
|
|
}
|
|
|
|
static inline long strncpy_from_sockptr(char *dst, sockptr_t src, size_t count)
|
|
{
|
|
if (sockptr_is_kernel(src)) {
|
|
size_t len = min(strnlen(src.kernel, count - 1) + 1, count);
|
|
|
|
memcpy(dst, src.kernel, len);
|
|
return len;
|
|
}
|
|
return strncpy_from_user(dst, src.user, count);
|
|
}
|
|
|
|
static inline int check_zeroed_sockptr(sockptr_t src, size_t offset,
|
|
size_t size)
|
|
{
|
|
if (!sockptr_is_kernel(src))
|
|
return check_zeroed_user(src.user + offset, size);
|
|
return memchr_inv(src.kernel + offset, 0, size) == NULL;
|
|
}
|
|
|
|
#endif /* _LINUX_SOCKPTR_H */
|