cregit-Linux how code gets into the kernel

Release 4.18 fs/compat.c

Directory: fs
 *  linux/fs/compat.c
 *  Kernel compatibililty routines for e.g. 32 bit syscall support
 *  on 64 bit kernels.
 *  Copyright (C) 2002       Stephen Rothwell, IBM Corporation
 *  Copyright (C) 1997-2000  Jakub Jelinek  (
 *  Copyright (C) 1998       Eddie C. Dost  (
 *  Copyright (C) 2001,2002  Andi Kleen, SuSE Labs 
 *  Copyright (C) 2003       Pavel Machek (
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.

#include <linux/compat.h>
#include <linux/nfs4_mount.h>
#include <linux/syscalls.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "internal.h"

struct compat_nfs_string {
compat_uint_t len;
compat_uptr_t data;

static inline void compat_nfs_string(struct nfs_string *dst, struct compat_nfs_string *src) { dst->data = compat_ptr(src->data); dst->len = src->len; }


David Howells36100.00%1100.00%

struct compat_nfs4_mount_data_v1 { compat_int_t version; compat_int_t flags; compat_int_t rsize; compat_int_t wsize; compat_int_t timeo; compat_int_t retrans; compat_int_t acregmin; compat_int_t acregmax; compat_int_t acdirmin; compat_int_t acdirmax; struct compat_nfs_string client_addr; struct compat_nfs_string mnt_path; struct compat_nfs_string hostname; compat_uint_t host_addrlen; compat_uptr_t host_addr; compat_int_t proto; compat_int_t auth_flavourlen; compat_uptr_t auth_flavours; };
static int do_nfs4_super_data_conv(void *raw_data) { int version = *(compat_uint_t *) raw_data; if (version == 1) { struct compat_nfs4_mount_data_v1 *raw = raw_data; struct nfs4_mount_data *real = raw_data; /* copy the fields backwards */ real->auth_flavours = compat_ptr(raw->auth_flavours); real->auth_flavourlen = raw->auth_flavourlen; real->proto = raw->proto; real->host_addr = compat_ptr(raw->host_addr); real->host_addrlen = raw->host_addrlen; compat_nfs_string(&real->hostname, &raw->hostname); compat_nfs_string(&real->mnt_path, &raw->mnt_path); compat_nfs_string(&real->client_addr, &raw->client_addr); real->acdirmax = raw->acdirmax; real->acdirmin = raw->acdirmin; real->acregmax = raw->acregmax; real->acregmin = raw->acregmin; real->retrans = raw->retrans; real->timeo = raw->timeo; real->wsize = raw->wsize; real->rsize = raw->rsize; real->flags = raw->flags; real->version = raw->version; } return 0; }


David Howells211100.00%1100.00%

#define NFS4_NAME "nfs4" COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name, const char __user *, dir_name, const char __user *, type, compat_ulong_t, flags, const void __user *, data) { char *kernel_type; void *options; char *kernel_dev; int retval; kernel_type = copy_mount_string(type); retval = PTR_ERR(kernel_type); if (IS_ERR(kernel_type)) goto out; kernel_dev = copy_mount_string(dev_name); retval = PTR_ERR(kernel_dev); if (IS_ERR(kernel_dev)) goto out1; options = copy_mount_options(data); retval = PTR_ERR(options); if (IS_ERR(options)) goto out2; if (kernel_type && options) { if (!strcmp(kernel_type, NFS4_NAME)) { retval = -EINVAL; if (do_nfs4_super_data_conv(options)) goto out3; } } retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options); out3: kfree(options); out2: kfree(kernel_dev); out1: kfree(kernel_type); out: return retval; }

Overall Contributors

David Howells34264.29%213.33%
Matthew Wilcox7914.85%16.67%
Al Viro254.70%16.67%
Heiko Carstens244.51%16.67%
Tim Gardner224.14%16.67%
Vegard Nossum183.38%16.67%
SeungHun Lee61.13%16.67%
Stephen Rothwell50.94%16.67%
Andrew Morton50.94%213.33%
Tejun Heo30.56%16.67%
Linus Torvalds10.19%16.67%
Andrey Mirkin10.19%16.67%
Pavel Machek10.19%16.67%
Directory: fs
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