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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169/* 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;}
/* Deprecated. * This is unsafe, unless caller checked user provided optlen. * Prefer copy_safe_from_sockptr() instead. * * Returns 0 for success, or number of bytes not copied on error. */static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size){ return copy_from_sockptr_offset(dst, src, 0, size);}
/** * copy_safe_from_sockptr: copy a struct from sockptr * @dst: Destination address, in kernel space. This buffer must be @ksize * bytes long. * @ksize: Size of @dst struct. * @optval: Source address. (in user or kernel space) * @optlen: Size of @optval data. * * Returns: * * -EINVAL: @optlen < @ksize * * -EFAULT: access to userspace failed. * * 0 : @ksize bytes were copied */static inline int copy_safe_from_sockptr(void *dst, size_t ksize, sockptr_t optval, unsigned int optlen){ if (optlen < ksize) return -EINVAL; if (copy_from_sockptr(dst, optval, ksize)) return -EFAULT; return 0;}
static inline int copy_struct_from_sockptr(void *dst, size_t ksize, sockptr_t src, size_t usize){ if (!sockptr_is_kernel(src)) return copy_struct_from_user(dst, ksize, src.user, usize);
return copy_struct_from_bounce_buffer(dst, ksize, src.kernel, usize);}
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 int copy_to_sockptr(sockptr_t dst, const void *src, size_t size){ return copy_to_sockptr_offset(dst, 0, src, size);}
static inline intcopy_struct_to_sockptr(sockptr_t dst, size_t usize, const void *src, size_t ksize, bool *ignored_trailing){ if (!sockptr_is_kernel(dst)) return copy_struct_to_user(dst.user, usize, src, ksize, ignored_trailing);
return copy_struct_to_bounce_buffer(dst.kernel, usize, src, ksize, ignored_trailing);}
static inline void *memdup_sockptr_noprof(sockptr_t src, size_t len){ void *p = kmalloc_track_caller_noprof(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;}#define memdup_sockptr(...) alloc_hooks(memdup_sockptr_noprof(__VA_ARGS__))
static inline void *memdup_sockptr_nul_noprof(sockptr_t src, size_t len){ char *p = kmalloc_track_caller_noprof(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;}#define memdup_sockptr_nul(...) alloc_hooks(memdup_sockptr_nul_noprof(__VA_ARGS__))
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 */