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001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 #include <hwcore/paging.h> 019 #include <hwcore/paging.h> 020 #include <sos/thread.h> 020 #include <sos/thread.h> 021 #include <sos/assert.h> 021 #include <sos/assert.h> 022 #include <sos/kmalloc.h> 022 #include <sos/kmalloc.h> 023 023 024 #include "uaccess.h" 024 #include "uaccess.h" 025 025 026 026 027 int __uaccess_zero_fool_gcc = 0; 027 int __uaccess_zero_fool_gcc = 0; 028 /** 028 /** 029 * Make sure gcc optimizations don't go too fa 029 * Make sure gcc optimizations don't go too far and don't suppress the 030 * code at the given label because 1/ a global 030 * code at the given label because 1/ a global return is "above" (wrt 031 * source code lines), 2/ it is never "goto" 031 * source code lines), 2/ it is never "goto" 032 */ 032 */ 033 #define KEEP_LABEL(lbl) \ 033 #define KEEP_LABEL(lbl) \ 034 ({ if (__uaccess_zero_fool_gcc) goto lbl; }) 034 ({ if (__uaccess_zero_fool_gcc) goto lbl; }) 035 035 036 036 037 static sos_ret_t nocheck_user_memcpy(sos_vaddr 037 static sos_ret_t nocheck_user_memcpy(sos_vaddr_t dest, 038 sos_vaddr 038 sos_vaddr_t src, 039 sos_size_ 039 sos_size_t size, 040 sos_bool_ 040 sos_bool_t transfer_from_user) 041 { 041 { 042 __label__ catch_pgflt; 042 __label__ catch_pgflt; 043 char *cptr_dst; 043 char *cptr_dst; 044 const char *cptr_src; 044 const char *cptr_src; 045 sos_size_t transfer_sz; 045 sos_size_t transfer_sz; 046 sos_ret_t retval; 046 sos_ret_t retval; 047 047 048 KEEP_LABEL(catch_pgflt); 048 KEEP_LABEL(catch_pgflt); 049 049 050 if (size <= 0) << 051 return 0; << 052 << 053 retval = sos_thread_prepare_user_space_acces 050 retval = sos_thread_prepare_user_space_access(NULL, 054 051 (sos_vaddr_t) && catch_pgflt); 055 if (SOS_OK != retval) 052 if (SOS_OK != retval) 056 return retval; 053 return retval; 057 054 058 /* Version of memcpy that does not alter the 055 /* Version of memcpy that does not alter the stack pointer, in 059 order to be able to abruptedly jump to ca 056 order to be able to abruptedly jump to catch_pgflt without stack 060 inconsistency. That's the reason why we d 057 inconsistency. That's the reason why we don't call the normal 061 memcpy here: on page fault, it would retu 058 memcpy here: on page fault, it would return back in here, with 062 the stack frame returning back here again 059 the stack frame returning back here again */ 063 for (cptr_dst = (char*)dest, 060 for (cptr_dst = (char*)dest, 064 cptr_src = (const char*)src, 061 cptr_src = (const char*)src, 065 transfer_sz = size ; 062 transfer_sz = size ; 066 transfer_sz > 0 ; 063 transfer_sz > 0 ; 067 cptr_dst++, cptr_src++, transfer_sz--) 064 cptr_dst++, cptr_src++, transfer_sz--) 068 *cptr_dst = *cptr_src; 065 *cptr_dst = *cptr_src; 069 066 070 retval = sos_thread_end_user_space_access(); 067 retval = sos_thread_end_user_space_access(); 071 if (SOS_OK != retval) 068 if (SOS_OK != retval) 072 return retval; 069 return retval; 073 070 074 return size; 071 return size; 075 072 076 /* An unresolved page fault occured while ac 073 /* An unresolved page fault occured while accessing user space */ 077 catch_pgflt: 074 catch_pgflt: 078 { 075 { 079 struct sos_thread * cur_thr = sos_thread_g 076 struct sos_thread * cur_thr = sos_thread_get_current(); 080 sos_uaddr_t faulted_uaddr = cur_thr->fixup 077 sos_uaddr_t faulted_uaddr = cur_thr->fixup_uaccess.faulted_uaddr; 081 078 082 if (transfer_from_user) 079 if (transfer_from_user) 083 { 080 { 084 if ( (faulted_uaddr < src) || (faulted 081 if ( (faulted_uaddr < src) || (faulted_uaddr - size > src) ) 085 sos_display_fatal_error("Unexpected 082 sos_display_fatal_error("Unexpected read access in user space"); 086 retval = faulted_uaddr - src; 083 retval = faulted_uaddr - src; 087 } 084 } 088 else 085 else 089 { 086 { 090 if ( (faulted_uaddr < dest) || (faulte 087 if ( (faulted_uaddr < dest) || (faulted_uaddr - size > dest) ) 091 sos_display_fatal_error("Unexpected 088 sos_display_fatal_error("Unexpected write access in user space"); 092 retval = faulted_uaddr - dest; 089 retval = faulted_uaddr - dest; 093 } 090 } 094 091 095 sos_thread_end_user_space_access(); 092 sos_thread_end_user_space_access(); 096 return retval; 093 return retval; 097 } 094 } 098 } 095 } 099 096 100 097 101 sos_ret_t sos_memcpy_from_user(sos_vaddr_t ker 098 sos_ret_t sos_memcpy_from_user(sos_vaddr_t kernel_to, 102 sos_uaddr_t use 099 sos_uaddr_t user_from, 103 sos_size_t size 100 sos_size_t size) 104 { 101 { 105 /* Make sure user is trying to access user s 102 /* Make sure user is trying to access user space */ 106 if (user_from < SOS_PAGING_BASE_USER_ADDRESS 103 if (user_from < SOS_PAGING_BASE_USER_ADDRESS) 107 return -SOS_EPERM; 104 return -SOS_EPERM; 108 105 109 if (user_from > SOS_PAGING_TOP_USER_ADDRESS 106 if (user_from > SOS_PAGING_TOP_USER_ADDRESS - size) 110 return -SOS_EPERM; 107 return -SOS_EPERM; 111 108 112 return nocheck_user_memcpy(kernel_to, user_f 109 return nocheck_user_memcpy(kernel_to, user_from, size, TRUE); 113 } 110 } 114 111 115 112 116 sos_ret_t sos_memdup_from_user(sos_vaddr_t * k << 117 sos_size_t leng << 118 sos_ui32_t kmal << 119 { << 120 sos_ret_t retval; << 121 << 122 if (length <= 0) << 123 return -SOS_EINVAL; << 124 << 125 *kernel_to = sos_kmalloc(length, kmalloc_fla << 126 if (NULL == (void*) *kernel_to) << 127 return -SOS_ENOMEM; << 128 << 129 retval = sos_memcpy_from_user(*kernel_to, fr << 130 if ((sos_ret_t)length != retval) << 131 { << 132 sos_kfree((sos_vaddr_t)*kernel_to); << 133 *kernel_to = (sos_vaddr_t) NULL; << 134 retval = -SOS_EFAULT; << 135 } << 136 else << 137 retval = SOS_OK; << 138 << 139 return retval; << 140 } << 141 << 142 << 143 sos_ret_t sos_memcpy_to_user(sos_uaddr_t user_ 113 sos_ret_t sos_memcpy_to_user(sos_uaddr_t user_to, 144 sos_vaddr_t kerne 114 sos_vaddr_t kernel_from, 145 sos_size_t size) 115 sos_size_t size) 146 { 116 { 147 /* Make sure user is trying to access user s 117 /* Make sure user is trying to access user space */ 148 if (user_to < SOS_PAGING_BASE_USER_ADDRESS) 118 if (user_to < SOS_PAGING_BASE_USER_ADDRESS) 149 return -SOS_EPERM; 119 return -SOS_EPERM; 150 120 151 if (user_to > SOS_PAGING_TOP_USER_ADDRESS - 121 if (user_to > SOS_PAGING_TOP_USER_ADDRESS - size) 152 return -SOS_EPERM; 122 return -SOS_EPERM; 153 123 154 return nocheck_user_memcpy(user_to, kernel_f 124 return nocheck_user_memcpy(user_to, kernel_from, size, FALSE); 155 } 125 } 156 126 157 127 158 sos_ret_t sos_strnlen_from_user(sos_uaddr_t us 128 sos_ret_t sos_strnlen_from_user(sos_uaddr_t user_str, sos_size_t max_len) 159 { 129 { 160 __label__ catch_pgflt; 130 __label__ catch_pgflt; 161 const char *sc; 131 const char *sc; 162 sos_ret_t retval; 132 sos_ret_t retval; 163 133 164 KEEP_LABEL(catch_pgflt); 134 KEEP_LABEL(catch_pgflt); 165 135 166 if (max_len <= 0) << 167 return 0; << 168 << 169 /* Make sure user is trying to access user s 136 /* Make sure user is trying to access user space */ 170 if (user_str < SOS_PAGING_BASE_USER_ADDRESS) 137 if (user_str < SOS_PAGING_BASE_USER_ADDRESS) 171 return -SOS_EPERM; 138 return -SOS_EPERM; 172 139 173 /* Don't allow invalid max_len */ 140 /* Don't allow invalid max_len */ 174 if ( (max_len < 1) || (max_len > SOS_PAGING_ 141 if ( (max_len < 1) || (max_len > SOS_PAGING_USER_SPACE_SIZE) ) 175 return -SOS_EINVAL; 142 return -SOS_EINVAL; 176 143 177 retval = sos_thread_prepare_user_space_acces 144 retval = sos_thread_prepare_user_space_access(NULL, 178 145 (sos_vaddr_t) && catch_pgflt); 179 if (SOS_OK != retval) 146 if (SOS_OK != retval) 180 return retval; 147 return retval; 181 148 182 /* Version of strnlen that does not alter th 149 /* Version of strnlen that does not alter the stack pointer, in 183 order to be able to abruptedly jump to ca 150 order to be able to abruptedly jump to catch_pgflt without stack 184 inconsistency. That's the reason why we d 151 inconsistency. That's the reason why we don't call the normal 185 strnlen here: on page fault, it would ret 152 strnlen here: on page fault, it would return back in here, with 186 the stack frame returning back here again 153 the stack frame returning back here again */ 187 for (sc = (const char *)user_str; max_len-- 154 for (sc = (const char *)user_str; max_len-- && *sc != '\0'; ++sc) 188 continue; 155 continue; 189 156 190 157 191 retval = sos_thread_end_user_space_access(); 158 retval = sos_thread_end_user_space_access(); 192 if (SOS_OK != retval) 159 if (SOS_OK != retval) 193 return retval; 160 return retval; 194 161 195 return ((sos_uaddr_t)sc - user_str); 162 return ((sos_uaddr_t)sc - user_str); 196 163 197 /* An unresolved page fault occured while ac 164 /* An unresolved page fault occured while accessing user space */ 198 catch_pgflt: 165 catch_pgflt: 199 { 166 { 200 sos_thread_end_user_space_access(); 167 sos_thread_end_user_space_access(); 201 return -SOS_EFAULT; 168 return -SOS_EFAULT; 202 } 169 } 203 } 170 } 204 171 205 172 206 static sos_ret_t nocheck_user_strzcpy(char *ds 173 static sos_ret_t nocheck_user_strzcpy(char *dst, const char *src, 207 sos_size 174 sos_size_t len) 208 { 175 { 209 __label__ catch_pgflt; 176 __label__ catch_pgflt; 210 unsigned int i; 177 unsigned int i; 211 sos_ret_t retval; 178 sos_ret_t retval; 212 179 213 KEEP_LABEL(catch_pgflt); 180 KEEP_LABEL(catch_pgflt); 214 181 215 if (len <= 0) << 216 return 0; << 217 << 218 retval = sos_thread_prepare_user_space_acces 182 retval = sos_thread_prepare_user_space_access(NULL, 219 183 (sos_vaddr_t) && catch_pgflt); 220 if (SOS_OK != retval) 184 if (SOS_OK != retval) 221 return retval; 185 return retval; 222 186 223 /* Version of strzcpy that does not alter th 187 /* Version of strzcpy that does not alter the stack pointer, in 224 order to be able to abruptedly jump to ca 188 order to be able to abruptedly jump to catch_pgflt without stack 225 inconsistency. That's the reason why we d 189 inconsistency. That's the reason why we don't call the normal 226 strzcpy here: on page fault, it would ret 190 strzcpy here: on page fault, it would return back in here, with 227 the stack frame returning back here again 191 the stack frame returning back here again */ 228 for (i = 0; i < len; i++) 192 for (i = 0; i < len; i++) 229 { 193 { 230 dst[i] = src[i]; 194 dst[i] = src[i]; 231 if(src[i] == '\0') 195 if(src[i] == '\0') 232 break; 196 break; 233 } 197 } 234 198 235 dst[len-1] = '\0'; 199 dst[len-1] = '\0'; 236 200 237 retval = sos_thread_end_user_space_access(); 201 retval = sos_thread_end_user_space_access(); 238 if (SOS_OK != retval) 202 if (SOS_OK != retval) 239 return retval; 203 return retval; 240 204 241 return SOS_OK; 205 return SOS_OK; 242 206 243 /* An unresolved page fault occured while ac 207 /* An unresolved page fault occured while accessing user space */ 244 catch_pgflt: 208 catch_pgflt: 245 { 209 { 246 sos_thread_end_user_space_access(); 210 sos_thread_end_user_space_access(); 247 return -SOS_EFAULT; 211 return -SOS_EFAULT; 248 } 212 } 249 } 213 } 250 214 251 215 252 sos_ret_t sos_strzcpy_from_user(char *kernel_t 216 sos_ret_t sos_strzcpy_from_user(char *kernel_to, sos_uaddr_t user_from, 253 sos_size_t max 217 sos_size_t max_len) 254 { 218 { 255 /* Make sure user is trying to access user s 219 /* Make sure user is trying to access user space */ 256 if ((sos_uaddr_t)user_from < SOS_PAGING_BASE 220 if ((sos_uaddr_t)user_from < SOS_PAGING_BASE_USER_ADDRESS) 257 return -SOS_EPERM; 221 return -SOS_EPERM; 258 222 259 /* Don't allow invalid max_len */ 223 /* Don't allow invalid max_len */ 260 if ( (max_len < 1) || (max_len > SOS_PAGING_ 224 if ( (max_len < 1) || (max_len > SOS_PAGING_USER_SPACE_SIZE) ) 261 return -SOS_EINVAL; 225 return -SOS_EINVAL; 262 226 263 return nocheck_user_strzcpy(kernel_to, (cons 227 return nocheck_user_strzcpy(kernel_to, (const char*)user_from, max_len); 264 } 228 } 265 229 266 230 267 sos_ret_t sos_strzcpy_to_user(sos_uaddr_t user 231 sos_ret_t sos_strzcpy_to_user(sos_uaddr_t user_to, const char *kernel_from, 268 sos_size_t max_l 232 sos_size_t max_len) 269 { 233 { 270 /* Make sure user is trying to access user s 234 /* Make sure user is trying to access user space */ 271 if ((sos_uaddr_t)user_to < SOS_PAGING_BASE_U 235 if ((sos_uaddr_t)user_to < SOS_PAGING_BASE_USER_ADDRESS) 272 return -SOS_EPERM; 236 return -SOS_EPERM; 273 237 274 /* Don't allow invalid max_len */ 238 /* Don't allow invalid max_len */ 275 if ( (max_len < 1) || (max_len > SOS_PAGING_ 239 if ( (max_len < 1) || (max_len > SOS_PAGING_USER_SPACE_SIZE) ) 276 return -SOS_EINVAL; 240 return -SOS_EINVAL; 277 241 278 return nocheck_user_strzcpy((char*)user_to, 242 return nocheck_user_strzcpy((char*)user_to, kernel_from, max_len); 279 } 243 } 280 244 281 245 282 sos_ret_t sos_strndup_from_user(char ** kernel 246 sos_ret_t sos_strndup_from_user(char ** kernel_to, sos_uaddr_t from_user, 283 sos_size_t max 247 sos_size_t max_len, 284 sos_ui32_t kma 248 sos_ui32_t kmalloc_flags) 285 { 249 { 286 sos_ret_t retval = sos_strnlen_from_user(fro 250 sos_ret_t retval = sos_strnlen_from_user(from_user, max_len); 287 if (retval < 0) 251 if (retval < 0) 288 return retval; 252 return retval; 289 253 290 *kernel_to = (char*)sos_kmalloc(retval + 1, 254 *kernel_to = (char*)sos_kmalloc(retval + 1, kmalloc_flags); 291 if (NULL == *kernel_to) 255 if (NULL == *kernel_to) 292 return -SOS_ENOMEM; 256 return -SOS_ENOMEM; 293 257 294 retval = sos_strzcpy_from_user(*kernel_to, f 258 retval = sos_strzcpy_from_user(*kernel_to, from_user, retval + 1); 295 if (SOS_OK != retval) 259 if (SOS_OK != retval) 296 { 260 { 297 sos_kfree((sos_vaddr_t)*kernel_to); 261 sos_kfree((sos_vaddr_t)*kernel_to); 298 *kernel_to = NULL; 262 *kernel_to = NULL; 299 } 263 } 300 264 301 return retval; 265 return retval; 302 } << 303 << 304 << 305 sos_ret_t sos_memcpy_generic_to(sos_genaddr_t << 306 sos_vaddr_t ke << 307 sos_size_t siz << 308 { << 309 if (to_addr.is_user) << 310 return sos_memcpy_to_user(to_addr.addr, ke << 311 memcpy((void*)to_addr.addr, (const void*)ker << 312 return size; << 313 } << 314 << 315 << 316 sos_ret_t sos_memcpy_generic_from(sos_vaddr_t << 317 sos_genaddr_ << 318 sos_size_t s << 319 { << 320 if (from_addr.is_user) << 321 return sos_memcpy_from_user(kernel_from, f << 322 memcpy((void*)kernel_from, (const void*)from << 323 return size; << 324 } 266 }
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