Blame view
fs/exec.c
46.9 KB
457c89965 treewide: Add SPD... |
1 |
// SPDX-License-Identifier: GPL-2.0-only |
1da177e4c Linux-2.6.12-rc2 |
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 |
/* * linux/fs/exec.c * * Copyright (C) 1991, 1992 Linus Torvalds */ /* * #!-checking implemented by tytso. */ /* * Demand-loading implemented 01.12.91 - no need to read anything but * the header into memory. The inode of the executable is put into * "current->executable", and page faults do the actual loading. Clean. * * Once more I can proudly say that linux stood up to being changed: it * was less than 2 hours work to get demand-loading completely implemented. * * Demand loading changed July 1993 by Eric Youngdale. Use mmap instead, * current->executable is only used by the procfs. This allows a dispatch * table to check for several different types of binary formats. We keep * trying until we recognize the file or we run out of supported binary |
613cc2b6f fs: exec: apply C... |
23 |
* formats. |
1da177e4c Linux-2.6.12-rc2 |
24 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
25 26 |
#include <linux/slab.h> #include <linux/file.h> |
9f3acc314 [PATCH] split lin... |
27 |
#include <linux/fdtable.h> |
ba92a43db exec: remove some... |
28 |
#include <linux/mm.h> |
615d6e875 mm: per-thread vm... |
29 |
#include <linux/vmacache.h> |
1da177e4c Linux-2.6.12-rc2 |
30 31 |
#include <linux/stat.h> #include <linux/fcntl.h> |
ba92a43db exec: remove some... |
32 |
#include <linux/swap.h> |
74aadce98 core_pattern: all... |
33 |
#include <linux/string.h> |
1da177e4c Linux-2.6.12-rc2 |
34 |
#include <linux/init.h> |
6e84f3152 sched/headers: Pr... |
35 |
#include <linux/sched/mm.h> |
f7ccbae45 sched/headers: Pr... |
36 |
#include <linux/sched/coredump.h> |
3f07c0144 sched/headers: Pr... |
37 |
#include <linux/sched/signal.h> |
6a3827d75 sched/headers: Pr... |
38 |
#include <linux/sched/numa_balancing.h> |
299300258 sched/headers: Pr... |
39 |
#include <linux/sched/task.h> |
ca5b172bd exec: include pag... |
40 |
#include <linux/pagemap.h> |
cdd6c482c perf: Do the big ... |
41 |
#include <linux/perf_event.h> |
1da177e4c Linux-2.6.12-rc2 |
42 43 44 45 46 |
#include <linux/highmem.h> #include <linux/spinlock.h> #include <linux/key.h> #include <linux/personality.h> #include <linux/binfmts.h> |
1da177e4c Linux-2.6.12-rc2 |
47 |
#include <linux/utsname.h> |
84d737866 [PATCH] add child... |
48 |
#include <linux/pid_namespace.h> |
1da177e4c Linux-2.6.12-rc2 |
49 50 |
#include <linux/module.h> #include <linux/namei.h> |
1da177e4c Linux-2.6.12-rc2 |
51 52 53 |
#include <linux/mount.h> #include <linux/security.h> #include <linux/syscalls.h> |
8f0ab5147 [PATCH] csa: conv... |
54 |
#include <linux/tsacct_kern.h> |
9f46080c4 [PATCH] Process E... |
55 |
#include <linux/cn_proc.h> |
473ae30bc [PATCH] execve ar... |
56 |
#include <linux/audit.h> |
6341c393f tracehook: exec |
57 |
#include <linux/tracehook.h> |
5f4123be3 remove CONFIG_KMO... |
58 |
#include <linux/kmod.h> |
6110e3abb sys_execve and sy... |
59 |
#include <linux/fsnotify.h> |
5ad4e53bd Get rid of indire... |
60 |
#include <linux/fs_struct.h> |
61be228a0 exec: allow do_co... |
61 |
#include <linux/pipe_fs_i.h> |
3d5992d2a oom: add per-mm o... |
62 |
#include <linux/oom.h> |
0e028465d exec: unify do_ex... |
63 |
#include <linux/compat.h> |
b44a7dfc6 vfs: define a gen... |
64 |
#include <linux/vmalloc.h> |
1da177e4c Linux-2.6.12-rc2 |
65 |
|
7c0f6ba68 Replace <asm/uacc... |
66 |
#include <linux/uaccess.h> |
1da177e4c Linux-2.6.12-rc2 |
67 |
#include <asm/mmu_context.h> |
b6a2fea39 mm: variable leng... |
68 |
#include <asm/tlb.h> |
43d2b1132 tracepoint: add t... |
69 70 |
#include <trace/events/task.h> |
a6f76f23d CRED: Make execve... |
71 |
#include "internal.h" |
1da177e4c Linux-2.6.12-rc2 |
72 |
|
4ff16c25e tracepoint, vfs, ... |
73 |
#include <trace/events/sched.h> |
d6e711448 [PATCH] setuid co... |
74 |
int suid_dumpable = 0; |
e4dc1b14d Use list_head in ... |
75 |
static LIST_HEAD(formats); |
1da177e4c Linux-2.6.12-rc2 |
76 |
static DEFINE_RWLOCK(binfmt_lock); |
8fc3dc5a3 __register_binfmt... |
77 |
void __register_binfmt(struct linux_binfmt * fmt, int insert) |
1da177e4c Linux-2.6.12-rc2 |
78 |
{ |
8fc3dc5a3 __register_binfmt... |
79 |
BUG_ON(!fmt); |
92eaa565a exec: kill ->load... |
80 81 |
if (WARN_ON(!fmt->load_binary)) return; |
1da177e4c Linux-2.6.12-rc2 |
82 |
write_lock(&binfmt_lock); |
74641f584 alpha: binfmt_aou... |
83 84 |
insert ? list_add(&fmt->lh, &formats) : list_add_tail(&fmt->lh, &formats); |
1da177e4c Linux-2.6.12-rc2 |
85 |
write_unlock(&binfmt_lock); |
1da177e4c Linux-2.6.12-rc2 |
86 |
} |
74641f584 alpha: binfmt_aou... |
87 |
EXPORT_SYMBOL(__register_binfmt); |
1da177e4c Linux-2.6.12-rc2 |
88 |
|
f6b450d48 Make unregister_b... |
89 |
void unregister_binfmt(struct linux_binfmt * fmt) |
1da177e4c Linux-2.6.12-rc2 |
90 |
{ |
1da177e4c Linux-2.6.12-rc2 |
91 |
write_lock(&binfmt_lock); |
e4dc1b14d Use list_head in ... |
92 |
list_del(&fmt->lh); |
1da177e4c Linux-2.6.12-rc2 |
93 |
write_unlock(&binfmt_lock); |
1da177e4c Linux-2.6.12-rc2 |
94 95 96 97 98 99 100 101 |
} EXPORT_SYMBOL(unregister_binfmt); static inline void put_binfmt(struct linux_binfmt * fmt) { module_put(fmt->module); } |
90f8572b0 vfs: Commit to ne... |
102 103 104 105 106 |
bool path_noexec(const struct path *path) { return (path->mnt->mnt_flags & MNT_NOEXEC) || (path->mnt->mnt_sb->s_iflags & SB_I_NOEXEC); } |
69369a700 fs, kernel: permi... |
107 |
#ifdef CONFIG_USELIB |
1da177e4c Linux-2.6.12-rc2 |
108 109 110 111 112 113 |
/* * Note that a shared library must be both readable and executable due to * security reasons. * * Also note that we take the address to load from from the file itself. */ |
1e7bfb213 [CVE-2009-0029] S... |
114 |
SYSCALL_DEFINE1(uselib, const char __user *, library) |
1da177e4c Linux-2.6.12-rc2 |
115 |
{ |
72c2d5319 file->f_op is nev... |
116 |
struct linux_binfmt *fmt; |
964bd1836 [PATCH] get rid o... |
117 |
struct file *file; |
91a27b2a7 vfs: define struc... |
118 |
struct filename *tmp = getname(library); |
964bd1836 [PATCH] get rid o... |
119 |
int error = PTR_ERR(tmp); |
47c805dc2 switch do_filp_op... |
120 121 |
static const struct open_flags uselib_flags = { .open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC, |
62fb4a155 don't carry MAY_O... |
122 |
.acc_mode = MAY_READ | MAY_EXEC, |
f9652e10c allow build_open_... |
123 124 |
.intent = LOOKUP_OPEN, .lookup_flags = LOOKUP_FOLLOW, |
47c805dc2 switch do_filp_op... |
125 |
}; |
964bd1836 [PATCH] get rid o... |
126 |
|
6e8341a11 Switch open_exec(... |
127 128 |
if (IS_ERR(tmp)) goto out; |
f9652e10c allow build_open_... |
129 |
file = do_filp_open(AT_FDCWD, tmp, &uselib_flags); |
6e8341a11 Switch open_exec(... |
130 131 132 |
putname(tmp); error = PTR_ERR(file); if (IS_ERR(file)) |
1da177e4c Linux-2.6.12-rc2 |
133 134 135 |
goto out; error = -EINVAL; |
496ad9aa8 new helper: file_... |
136 |
if (!S_ISREG(file_inode(file)->i_mode)) |
1da177e4c Linux-2.6.12-rc2 |
137 |
goto exit; |
30524472c [PATCH] take noex... |
138 |
error = -EACCES; |
90f8572b0 vfs: Commit to ne... |
139 |
if (path_noexec(&file->f_path)) |
6146f0d5e integrity: IMA hooks |
140 |
goto exit; |
1da177e4c Linux-2.6.12-rc2 |
141 |
|
2a12a9d78 fsnotify: pass a ... |
142 |
fsnotify_open(file); |
6110e3abb sys_execve and sy... |
143 |
|
1da177e4c Linux-2.6.12-rc2 |
144 |
error = -ENOEXEC; |
1da177e4c Linux-2.6.12-rc2 |
145 |
|
72c2d5319 file->f_op is nev... |
146 147 148 149 150 151 |
read_lock(&binfmt_lock); list_for_each_entry(fmt, &formats, lh) { if (!fmt->load_shlib) continue; if (!try_module_get(fmt->module)) continue; |
1da177e4c Linux-2.6.12-rc2 |
152 |
read_unlock(&binfmt_lock); |
72c2d5319 file->f_op is nev... |
153 154 155 156 157 |
error = fmt->load_shlib(file); read_lock(&binfmt_lock); put_binfmt(fmt); if (error != -ENOEXEC) break; |
1da177e4c Linux-2.6.12-rc2 |
158 |
} |
72c2d5319 file->f_op is nev... |
159 |
read_unlock(&binfmt_lock); |
6e8341a11 Switch open_exec(... |
160 |
exit: |
1da177e4c Linux-2.6.12-rc2 |
161 162 163 |
fput(file); out: return error; |
1da177e4c Linux-2.6.12-rc2 |
164 |
} |
69369a700 fs, kernel: permi... |
165 |
#endif /* #ifdef CONFIG_USELIB */ |
1da177e4c Linux-2.6.12-rc2 |
166 |
|
b6a2fea39 mm: variable leng... |
167 |
#ifdef CONFIG_MMU |
ae6b585ee exec: document ac... |
168 169 170 171 172 173 |
/* * The nascent bprm->mm is not visible until exec_mmap() but it can * use a lot of memory, account these pages in current->mm temporary * for oom_badness()->get_mm_rss(). Once exec succeeds or fails, we * change the counter back via acct_arg_size(0). */ |
0e028465d exec: unify do_ex... |
174 |
static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages) |
3c77f8457 exec: make argv/e... |
175 176 177 178 179 180 181 182 |
{ struct mm_struct *mm = current->mm; long diff = (long)(pages - bprm->vma_pages); if (!mm || !diff) return; bprm->vma_pages = pages; |
3c77f8457 exec: make argv/e... |
183 |
add_mm_counter(mm, MM_ANONPAGES, diff); |
3c77f8457 exec: make argv/e... |
184 |
} |
0e028465d exec: unify do_ex... |
185 |
static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, |
b6a2fea39 mm: variable leng... |
186 187 188 189 |
int write) { struct page *page; int ret; |
9beae1ea8 mm: replace get_u... |
190 |
unsigned int gup_flags = FOLL_FORCE; |
b6a2fea39 mm: variable leng... |
191 192 193 |
#ifdef CONFIG_STACK_GROWSUP if (write) { |
d05f3169c mm: make expand_d... |
194 |
ret = expand_downwards(bprm->vma, pos); |
b6a2fea39 mm: variable leng... |
195 196 197 198 |
if (ret < 0) return NULL; } #endif |
9beae1ea8 mm: replace get_u... |
199 200 201 |
if (write) gup_flags |= FOLL_WRITE; |
1e9877902 mm/gup: Introduce... |
202 203 204 205 |
/* * We are doing an exec(). 'current' is the process * doing the exec and bprm->mm is the new process's mm. */ |
9beae1ea8 mm: replace get_u... |
206 |
ret = get_user_pages_remote(current, bprm->mm, pos, 1, gup_flags, |
5b56d49fc mm: add locked pa... |
207 |
&page, NULL, NULL); |
b6a2fea39 mm: variable leng... |
208 209 |
if (ret <= 0) return NULL; |
655c16a8c exec: separate MM... |
210 211 |
if (write) acct_arg_size(bprm, vma_pages(bprm->vma)); |
b6a2fea39 mm: variable leng... |
212 213 214 215 216 217 218 219 |
return page; } static void put_arg_page(struct page *page) { put_page(page); } |
b6a2fea39 mm: variable leng... |
220 221 222 223 224 225 226 227 228 229 230 231 |
static void free_arg_pages(struct linux_binprm *bprm) { } static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos, struct page *page) { flush_cache_page(bprm->vma, pos, page_to_pfn(page)); } static int __bprm_mm_init(struct linux_binprm *bprm) { |
eaccbfa56 fs/exec.c:__bprm_... |
232 |
int err; |
b6a2fea39 mm: variable leng... |
233 234 |
struct vm_area_struct *vma = NULL; struct mm_struct *mm = bprm->mm; |
490fc0538 mm: make vm_area_... |
235 |
bprm->vma = vma = vm_area_alloc(mm); |
b6a2fea39 mm: variable leng... |
236 |
if (!vma) |
eaccbfa56 fs/exec.c:__bprm_... |
237 |
return -ENOMEM; |
bfd40eaff mm: fix vma_is_an... |
238 |
vma_set_anonymous(vma); |
b6a2fea39 mm: variable leng... |
239 |
|
f268dfe90 exec: make exec p... |
240 241 242 243 |
if (down_write_killable(&mm->mmap_sem)) { err = -EINTR; goto err_free; } |
b6a2fea39 mm: variable leng... |
244 245 246 247 248 249 250 |
/* * Place the stack at the largest stack address the architecture * supports. Later, we'll move this to an appropriate place. We don't * use STACK_TOP because that can depend on attributes which aren't * configured yet. */ |
aacb3d17a fs/exec.c: use BU... |
251 |
BUILD_BUG_ON(VM_STACK_FLAGS & VM_STACK_INCOMPLETE_SETUP); |
b6a2fea39 mm: variable leng... |
252 253 |
vma->vm_end = STACK_TOP_MAX; vma->vm_start = vma->vm_end - PAGE_SIZE; |
d9104d1ca mm: track vma cha... |
254 |
vma->vm_flags = VM_SOFTDIRTY | VM_STACK_FLAGS | VM_STACK_INCOMPLETE_SETUP; |
3ed75eb8f setup vma->vm_pag... |
255 |
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
462e635e5 install_special_m... |
256 |
|
b6a2fea39 mm: variable leng... |
257 |
err = insert_vm_struct(mm, vma); |
eaccbfa56 fs/exec.c:__bprm_... |
258 |
if (err) |
b6a2fea39 mm: variable leng... |
259 |
goto err; |
b6a2fea39 mm: variable leng... |
260 261 |
mm->stack_vm = mm->total_vm = 1; |
fe3d197f8 x86, mpx: On-dema... |
262 |
arch_bprm_mm_init(mm, vma); |
b6a2fea39 mm: variable leng... |
263 |
up_write(&mm->mmap_sem); |
b6a2fea39 mm: variable leng... |
264 |
bprm->p = vma->vm_end - sizeof(void *); |
b6a2fea39 mm: variable leng... |
265 |
return 0; |
b6a2fea39 mm: variable leng... |
266 |
err: |
eaccbfa56 fs/exec.c:__bprm_... |
267 |
up_write(&mm->mmap_sem); |
f268dfe90 exec: make exec p... |
268 |
err_free: |
eaccbfa56 fs/exec.c:__bprm_... |
269 |
bprm->vma = NULL; |
3928d4f5e mm: use helper fu... |
270 |
vm_area_free(vma); |
b6a2fea39 mm: variable leng... |
271 272 273 274 275 276 277 278 279 |
return err; } static bool valid_arg_len(struct linux_binprm *bprm, long len) { return len <= MAX_ARG_STRLEN; } #else |
0e028465d exec: unify do_ex... |
280 |
static inline void acct_arg_size(struct linux_binprm *bprm, unsigned long pages) |
3c77f8457 exec: make argv/e... |
281 282 |
{ } |
0e028465d exec: unify do_ex... |
283 |
static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, |
b6a2fea39 mm: variable leng... |
284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 |
int write) { struct page *page; page = bprm->page[pos / PAGE_SIZE]; if (!page && write) { page = alloc_page(GFP_HIGHUSER|__GFP_ZERO); if (!page) return NULL; bprm->page[pos / PAGE_SIZE] = page; } return page; } static void put_arg_page(struct page *page) { } static void free_arg_page(struct linux_binprm *bprm, int i) { if (bprm->page[i]) { __free_page(bprm->page[i]); bprm->page[i] = NULL; } } static void free_arg_pages(struct linux_binprm *bprm) { int i; for (i = 0; i < MAX_ARG_PAGES; i++) free_arg_page(bprm, i); } static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos, struct page *page) { } static int __bprm_mm_init(struct linux_binprm *bprm) { bprm->p = PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *); return 0; } static bool valid_arg_len(struct linux_binprm *bprm, long len) { return len <= bprm->p; } #endif /* CONFIG_MMU */ /* * Create a new mm_struct and populate it with a temporary stack * vm_area_struct. We don't have enough context at this point to set the stack * flags, permissions, and offset, so we use temporary values. We'll update * them later in setup_arg_pages(). */ |
9cc64ceaa fs/exec.c: make b... |
343 |
static int bprm_mm_init(struct linux_binprm *bprm) |
b6a2fea39 mm: variable leng... |
344 345 346 347 348 349 350 351 |
{ int err; struct mm_struct *mm = NULL; bprm->mm = mm = mm_alloc(); err = -ENOMEM; if (!mm) goto err; |
c31dbb146 exec: pin stack l... |
352 353 354 355 |
/* Save current stack limit for all calculations made during exec. */ task_lock(current->group_leader); bprm->rlim_stack = current->signal->rlim[RLIMIT_STACK]; task_unlock(current->group_leader); |
b6a2fea39 mm: variable leng... |
356 357 358 359 360 361 362 363 364 365 366 367 368 369 |
err = __bprm_mm_init(bprm); if (err) goto err; return 0; err: if (mm) { bprm->mm = NULL; mmdrop(mm); } return err; } |
ba2d01629 exec: introduce s... |
370 |
struct user_arg_ptr { |
0e028465d exec: unify do_ex... |
371 372 373 374 375 376 |
#ifdef CONFIG_COMPAT bool is_compat; #endif union { const char __user *const __user *native; #ifdef CONFIG_COMPAT |
38b983b34 generic sys_execve() |
377 |
const compat_uptr_t __user *compat; |
0e028465d exec: unify do_ex... |
378 379 |
#endif } ptr; |
ba2d01629 exec: introduce s... |
380 381 382 |
}; static const char __user *get_user_arg_ptr(struct user_arg_ptr argv, int nr) |
1d1dbf813 exec: introduce g... |
383 |
{ |
0e028465d exec: unify do_ex... |
384 385 386 387 388 389 390 391 |
const char __user *native; #ifdef CONFIG_COMPAT if (unlikely(argv.is_compat)) { compat_uptr_t compat; if (get_user(compat, argv.ptr.compat + nr)) return ERR_PTR(-EFAULT); |
1d1dbf813 exec: introduce g... |
392 |
|
0e028465d exec: unify do_ex... |
393 394 395 396 397 |
return compat_ptr(compat); } #endif if (get_user(native, argv.ptr.native + nr)) |
1d1dbf813 exec: introduce g... |
398 |
return ERR_PTR(-EFAULT); |
0e028465d exec: unify do_ex... |
399 |
return native; |
1d1dbf813 exec: introduce g... |
400 |
} |
1da177e4c Linux-2.6.12-rc2 |
401 402 403 |
/* * count() counts the number of strings in array ARGV. */ |
ba2d01629 exec: introduce s... |
404 |
static int count(struct user_arg_ptr argv, int max) |
1da177e4c Linux-2.6.12-rc2 |
405 406 |
{ int i = 0; |
0e028465d exec: unify do_ex... |
407 |
if (argv.ptr.native != NULL) { |
1da177e4c Linux-2.6.12-rc2 |
408 |
for (;;) { |
1d1dbf813 exec: introduce g... |
409 |
const char __user *p = get_user_arg_ptr(argv, i); |
1da177e4c Linux-2.6.12-rc2 |
410 |
|
1da177e4c Linux-2.6.12-rc2 |
411 412 |
if (!p) break; |
1d1dbf813 exec: introduce g... |
413 414 415 |
if (IS_ERR(p)) return -EFAULT; |
6d92d4f6a fs/exec.c: work a... |
416 |
if (i >= max) |
1da177e4c Linux-2.6.12-rc2 |
417 |
return -E2BIG; |
6d92d4f6a fs/exec.c: work a... |
418 |
++i; |
9aea5a65a execve: make resp... |
419 420 421 |
if (fatal_signal_pending(current)) return -ERESTARTNOHAND; |
1da177e4c Linux-2.6.12-rc2 |
422 423 424 425 426 |
cond_resched(); } } return i; } |
655c16a8c exec: separate MM... |
427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 |
static int prepare_arg_pages(struct linux_binprm *bprm, struct user_arg_ptr argv, struct user_arg_ptr envp) { unsigned long limit, ptr_size; bprm->argc = count(argv, MAX_ARG_STRINGS); if (bprm->argc < 0) return bprm->argc; bprm->envc = count(envp, MAX_ARG_STRINGS); if (bprm->envc < 0) return bprm->envc; /* * Limit to 1/4 of the max stack size or 3/4 of _STK_LIM * (whichever is smaller) for the argv+env strings. * This ensures that: * - the remaining binfmt code will not run out of stack space, * - the program will have a reasonable amount of stack left * to work from. */ limit = _STK_LIM / 4 * 3; limit = min(limit, bprm->rlim_stack.rlim_cur / 4); /* * We've historically supported up to 32 pages (ARG_MAX) * of argument strings even with small stacks */ limit = max_t(unsigned long, limit, ARG_MAX); /* * We must account for the size of all the argv and envp pointers to * the argv and envp strings, since they will also take up space in * the stack. They aren't stored until much later when we can't * signal to the parent that the child has run out of stack space. * Instead, calculate it here so it's possible to fail gracefully. */ ptr_size = (bprm->argc + bprm->envc) * sizeof(void *); if (limit <= ptr_size) return -E2BIG; limit -= ptr_size; bprm->argmin = bprm->p - limit; return 0; } |
1da177e4c Linux-2.6.12-rc2 |
470 |
/* |
b6a2fea39 mm: variable leng... |
471 472 473 |
* 'copy_strings()' copies argument/environment strings from the old * processes's memory to the new process's stack. The call to get_user_pages() * ensures the destination page is created and not swapped out. |
1da177e4c Linux-2.6.12-rc2 |
474 |
*/ |
ba2d01629 exec: introduce s... |
475 |
static int copy_strings(int argc, struct user_arg_ptr argv, |
75c96f858 [PATCH] make some... |
476 |
struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
477 478 479 |
{ struct page *kmapped_page = NULL; char *kaddr = NULL; |
b6a2fea39 mm: variable leng... |
480 |
unsigned long kpos = 0; |
1da177e4c Linux-2.6.12-rc2 |
481 482 483 |
int ret; while (argc-- > 0) { |
d7627467b Make do_execve() ... |
484 |
const char __user *str; |
1da177e4c Linux-2.6.12-rc2 |
485 486 |
int len; unsigned long pos; |
1d1dbf813 exec: introduce g... |
487 488 489 |
ret = -EFAULT; str = get_user_arg_ptr(argv, argc); if (IS_ERR(str)) |
1da177e4c Linux-2.6.12-rc2 |
490 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
491 |
|
1d1dbf813 exec: introduce g... |
492 493 494 495 496 497 |
len = strnlen_user(str, MAX_ARG_STRLEN); if (!len) goto out; ret = -E2BIG; if (!valid_arg_len(bprm, len)) |
1da177e4c Linux-2.6.12-rc2 |
498 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
499 |
|
b6a2fea39 mm: variable leng... |
500 |
/* We're going to work our way backwords. */ |
1da177e4c Linux-2.6.12-rc2 |
501 |
pos = bprm->p; |
b6a2fea39 mm: variable leng... |
502 503 |
str += len; bprm->p -= len; |
655c16a8c exec: separate MM... |
504 505 506 507 |
#ifdef CONFIG_MMU if (bprm->p < bprm->argmin) goto out; #endif |
1da177e4c Linux-2.6.12-rc2 |
508 509 |
while (len > 0) { |
1da177e4c Linux-2.6.12-rc2 |
510 |
int offset, bytes_to_copy; |
1da177e4c Linux-2.6.12-rc2 |
511 |
|
9aea5a65a execve: make resp... |
512 513 514 515 |
if (fatal_signal_pending(current)) { ret = -ERESTARTNOHAND; goto out; } |
7993bc1f4 execve: improve i... |
516 |
cond_resched(); |
1da177e4c Linux-2.6.12-rc2 |
517 |
offset = pos % PAGE_SIZE; |
b6a2fea39 mm: variable leng... |
518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 |
if (offset == 0) offset = PAGE_SIZE; bytes_to_copy = offset; if (bytes_to_copy > len) bytes_to_copy = len; offset -= bytes_to_copy; pos -= bytes_to_copy; str -= bytes_to_copy; len -= bytes_to_copy; if (!kmapped_page || kpos != (pos & PAGE_MASK)) { struct page *page; page = get_arg_page(bprm, pos, 1); |
1da177e4c Linux-2.6.12-rc2 |
534 |
if (!page) { |
b6a2fea39 mm: variable leng... |
535 |
ret = -E2BIG; |
1da177e4c Linux-2.6.12-rc2 |
536 537 |
goto out; } |
1da177e4c Linux-2.6.12-rc2 |
538 |
|
b6a2fea39 mm: variable leng... |
539 540 |
if (kmapped_page) { flush_kernel_dcache_page(kmapped_page); |
1da177e4c Linux-2.6.12-rc2 |
541 |
kunmap(kmapped_page); |
b6a2fea39 mm: variable leng... |
542 543 |
put_arg_page(kmapped_page); } |
1da177e4c Linux-2.6.12-rc2 |
544 545 |
kmapped_page = page; kaddr = kmap(kmapped_page); |
b6a2fea39 mm: variable leng... |
546 547 |
kpos = pos & PAGE_MASK; flush_arg_page(bprm, kpos, kmapped_page); |
1da177e4c Linux-2.6.12-rc2 |
548 |
} |
b6a2fea39 mm: variable leng... |
549 |
if (copy_from_user(kaddr+offset, str, bytes_to_copy)) { |
1da177e4c Linux-2.6.12-rc2 |
550 551 552 |
ret = -EFAULT; goto out; } |
1da177e4c Linux-2.6.12-rc2 |
553 554 555 556 |
} } ret = 0; out: |
b6a2fea39 mm: variable leng... |
557 558 |
if (kmapped_page) { flush_kernel_dcache_page(kmapped_page); |
1da177e4c Linux-2.6.12-rc2 |
559 |
kunmap(kmapped_page); |
b6a2fea39 mm: variable leng... |
560 561 |
put_arg_page(kmapped_page); } |
1da177e4c Linux-2.6.12-rc2 |
562 563 564 565 566 567 |
return ret; } /* * Like copy_strings, but get argv and its values from kernel memory. */ |
ba2d01629 exec: introduce s... |
568 |
int copy_strings_kernel(int argc, const char *const *__argv, |
d7627467b Make do_execve() ... |
569 |
struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
570 571 572 |
{ int r; mm_segment_t oldfs = get_fs(); |
ba2d01629 exec: introduce s... |
573 |
struct user_arg_ptr argv = { |
0e028465d exec: unify do_ex... |
574 |
.ptr.native = (const char __user *const __user *)__argv, |
ba2d01629 exec: introduce s... |
575 |
}; |
1da177e4c Linux-2.6.12-rc2 |
576 |
set_fs(KERNEL_DS); |
ba2d01629 exec: introduce s... |
577 |
r = copy_strings(argc, argv, bprm); |
1da177e4c Linux-2.6.12-rc2 |
578 |
set_fs(oldfs); |
ba2d01629 exec: introduce s... |
579 |
|
1da177e4c Linux-2.6.12-rc2 |
580 581 |
return r; } |
1da177e4c Linux-2.6.12-rc2 |
582 583 584 |
EXPORT_SYMBOL(copy_strings_kernel); #ifdef CONFIG_MMU |
b6a2fea39 mm: variable leng... |
585 |
|
1da177e4c Linux-2.6.12-rc2 |
586 |
/* |
b6a2fea39 mm: variable leng... |
587 588 589 |
* During bprm_mm_init(), we create a temporary stack at STACK_TOP_MAX. Once * the binfmt code determines where the new stack should reside, we shift it to * its final location. The process proceeds as follows: |
1da177e4c Linux-2.6.12-rc2 |
590 |
* |
b6a2fea39 mm: variable leng... |
591 592 593 594 595 596 |
* 1) Use shift to calculate the new vma endpoints. * 2) Extend vma to cover both the old and new ranges. This ensures the * arguments passed to subsequent functions are consistent. * 3) Move vma's page tables to the new range. * 4) Free up any cleared pgd range. * 5) Shrink the vma to cover only the new range. |
1da177e4c Linux-2.6.12-rc2 |
597 |
*/ |
b6a2fea39 mm: variable leng... |
598 |
static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift) |
1da177e4c Linux-2.6.12-rc2 |
599 600 |
{ struct mm_struct *mm = vma->vm_mm; |
b6a2fea39 mm: variable leng... |
601 602 603 604 605 |
unsigned long old_start = vma->vm_start; unsigned long old_end = vma->vm_end; unsigned long length = old_end - old_start; unsigned long new_start = old_start - shift; unsigned long new_end = old_end - shift; |
d16dfc550 mm: mmu_gather re... |
606 |
struct mmu_gather tlb; |
1da177e4c Linux-2.6.12-rc2 |
607 |
|
b6a2fea39 mm: variable leng... |
608 |
BUG_ON(new_start > new_end); |
1da177e4c Linux-2.6.12-rc2 |
609 |
|
b6a2fea39 mm: variable leng... |
610 611 612 613 614 615 616 617 618 619 |
/* * ensure there are no vmas between where we want to go * and where we are */ if (vma != find_vma(mm, new_start)) return -EFAULT; /* * cover the whole range: [new_start, old_end) */ |
5beb49305 mm: change anon_v... |
620 621 |
if (vma_adjust(vma, new_start, old_end, vma->vm_pgoff, NULL)) return -ENOMEM; |
b6a2fea39 mm: variable leng... |
622 623 624 625 626 627 |
/* * move the page tables downwards, on failure we rely on * process cleanup to remove whatever mess we made. */ if (length != move_page_tables(vma, old_start, |
38a76013a mm: avoid taking ... |
628 |
vma, new_start, length, false)) |
b6a2fea39 mm: variable leng... |
629 630 631 |
return -ENOMEM; lru_add_drain(); |
2b047252d Fix TLB gather vi... |
632 |
tlb_gather_mmu(&tlb, mm, old_start, old_end); |
b6a2fea39 mm: variable leng... |
633 634 635 636 |
if (new_end > old_start) { /* * when the old and new regions overlap clear from new_end. */ |
d16dfc550 mm: mmu_gather re... |
637 |
free_pgd_range(&tlb, new_end, old_end, new_end, |
6ee8630e0 mm: allow arch co... |
638 |
vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING); |
b6a2fea39 mm: variable leng... |
639 640 641 642 643 644 645 |
} else { /* * otherwise, clean from old_start; this is done to not touch * the address space in [new_end, old_start) some architectures * have constraints on va-space that make this illegal (IA64) - * for the others its just a little faster. */ |
d16dfc550 mm: mmu_gather re... |
646 |
free_pgd_range(&tlb, old_start, old_end, new_end, |
6ee8630e0 mm: allow arch co... |
647 |
vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING); |
1da177e4c Linux-2.6.12-rc2 |
648 |
} |
2b047252d Fix TLB gather vi... |
649 |
tlb_finish_mmu(&tlb, old_start, old_end); |
b6a2fea39 mm: variable leng... |
650 651 |
/* |
5beb49305 mm: change anon_v... |
652 |
* Shrink the vma to just the new range. Always succeeds. |
b6a2fea39 mm: variable leng... |
653 654 655 656 |
*/ vma_adjust(vma, new_start, new_end, vma->vm_pgoff, NULL); return 0; |
1da177e4c Linux-2.6.12-rc2 |
657 |
} |
b6a2fea39 mm: variable leng... |
658 659 660 661 |
/* * Finalizes the stack vm_area_struct. The flags and permissions are updated, * the stack is optionally relocated, and some extra space is added. */ |
1da177e4c Linux-2.6.12-rc2 |
662 663 664 665 |
int setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack) { |
b6a2fea39 mm: variable leng... |
666 667 |
unsigned long ret; unsigned long stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
668 |
struct mm_struct *mm = current->mm; |
b6a2fea39 mm: variable leng... |
669 670 671 672 |
struct vm_area_struct *vma = bprm->vma; struct vm_area_struct *prev = NULL; unsigned long vm_flags; unsigned long stack_base; |
803bf5ec2 fs/exec.c: restri... |
673 674 675 |
unsigned long stack_size; unsigned long stack_expand; unsigned long rlim_stack; |
1da177e4c Linux-2.6.12-rc2 |
676 677 |
#ifdef CONFIG_STACK_GROWSUP |
d71f290b4 metag: Reduce max... |
678 |
/* Limit stack size */ |
c31dbb146 exec: pin stack l... |
679 |
stack_base = bprm->rlim_stack.rlim_max; |
d71f290b4 metag: Reduce max... |
680 681 |
if (stack_base > STACK_SIZE_MAX) stack_base = STACK_SIZE_MAX; |
1da177e4c Linux-2.6.12-rc2 |
682 |
|
d045c77c1 parisc,metag: Fix... |
683 684 |
/* Add space for stack randomization. */ stack_base += (STACK_RND_MASK << PAGE_SHIFT); |
b6a2fea39 mm: variable leng... |
685 686 687 |
/* Make sure we didn't let the argument array grow too large. */ if (vma->vm_end - vma->vm_start > stack_base) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
688 |
|
b6a2fea39 mm: variable leng... |
689 |
stack_base = PAGE_ALIGN(stack_top - stack_base); |
1da177e4c Linux-2.6.12-rc2 |
690 |
|
b6a2fea39 mm: variable leng... |
691 692 693 |
stack_shift = vma->vm_start - stack_base; mm->arg_start = bprm->p - stack_shift; bprm->p = vma->vm_end - stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
694 |
#else |
b6a2fea39 mm: variable leng... |
695 696 |
stack_top = arch_align_stack(stack_top); stack_top = PAGE_ALIGN(stack_top); |
1b528181b setup_arg_pages: ... |
697 698 699 700 |
if (unlikely(stack_top < mmap_min_addr) || unlikely(vma->vm_end - vma->vm_start >= stack_top - mmap_min_addr)) return -ENOMEM; |
b6a2fea39 mm: variable leng... |
701 702 703 |
stack_shift = vma->vm_end - stack_top; bprm->p -= stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
704 |
mm->arg_start = bprm->p; |
1da177e4c Linux-2.6.12-rc2 |
705 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
706 |
if (bprm->loader) |
b6a2fea39 mm: variable leng... |
707 708 |
bprm->loader -= stack_shift; bprm->exec -= stack_shift; |
1da177e4c Linux-2.6.12-rc2 |
709 |
|
f268dfe90 exec: make exec p... |
710 711 |
if (down_write_killable(&mm->mmap_sem)) return -EINTR; |
96a8e13ed exec: fix stack e... |
712 |
vm_flags = VM_STACK_FLAGS; |
b6a2fea39 mm: variable leng... |
713 714 715 716 717 718 719 720 721 722 723 |
/* * Adjust stack execute permissions; explicitly enable for * EXSTACK_ENABLE_X, disable for EXSTACK_DISABLE_X and leave alone * (arch default) otherwise. */ if (unlikely(executable_stack == EXSTACK_ENABLE_X)) vm_flags |= VM_EXEC; else if (executable_stack == EXSTACK_DISABLE_X) vm_flags &= ~VM_EXEC; vm_flags |= mm->def_flags; |
a8bef8ff6 mm: migration: av... |
724 |
vm_flags |= VM_STACK_INCOMPLETE_SETUP; |
b6a2fea39 mm: variable leng... |
725 726 727 728 729 730 731 732 733 734 |
ret = mprotect_fixup(vma, &prev, vma->vm_start, vma->vm_end, vm_flags); if (ret) goto out_unlock; BUG_ON(prev != vma); /* Move stack pages down in memory. */ if (stack_shift) { ret = shift_arg_pages(vma, stack_shift); |
fc63cf237 exec: setup_arg_p... |
735 736 |
if (ret) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
737 |
} |
a8bef8ff6 mm: migration: av... |
738 739 |
/* mprotect_fixup is overkill to remove the temporary stack flags */ vma->vm_flags &= ~VM_STACK_INCOMPLETE_SETUP; |
5ef097dd7 exec: create init... |
740 |
stack_expand = 131072UL; /* randomly 32*4k (or 2*64k) pages */ |
803bf5ec2 fs/exec.c: restri... |
741 742 743 744 745 |
stack_size = vma->vm_end - vma->vm_start; /* * Align this down to a page boundary as expand_stack * will align it up. */ |
c31dbb146 exec: pin stack l... |
746 |
rlim_stack = bprm->rlim_stack.rlim_cur & PAGE_MASK; |
b6a2fea39 mm: variable leng... |
747 |
#ifdef CONFIG_STACK_GROWSUP |
803bf5ec2 fs/exec.c: restri... |
748 749 750 751 |
if (stack_size + stack_expand > rlim_stack) stack_base = vma->vm_start + rlim_stack; else stack_base = vma->vm_end + stack_expand; |
b6a2fea39 mm: variable leng... |
752 |
#else |
803bf5ec2 fs/exec.c: restri... |
753 754 755 756 |
if (stack_size + stack_expand > rlim_stack) stack_base = vma->vm_end - rlim_stack; else stack_base = vma->vm_start - stack_expand; |
b6a2fea39 mm: variable leng... |
757 |
#endif |
3af9e8592 perf: Add non-exe... |
758 |
current->mm->start_stack = bprm->p; |
b6a2fea39 mm: variable leng... |
759 760 761 762 763 |
ret = expand_stack(vma, stack_base); if (ret) ret = -EFAULT; out_unlock: |
1da177e4c Linux-2.6.12-rc2 |
764 |
up_write(&mm->mmap_sem); |
fc63cf237 exec: setup_arg_p... |
765 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
766 |
} |
1da177e4c Linux-2.6.12-rc2 |
767 |
EXPORT_SYMBOL(setup_arg_pages); |
7e7ec6a93 elf_fdpic_transfe... |
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 |
#else /* * Transfer the program arguments and environment from the holding pages * onto the stack. The provided stack pointer is adjusted accordingly. */ int transfer_args_to_stack(struct linux_binprm *bprm, unsigned long *sp_location) { unsigned long index, stop, sp; int ret = 0; stop = bprm->p >> PAGE_SHIFT; sp = *sp_location; for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { unsigned int offset = index == stop ? bprm->p & ~PAGE_MASK : 0; char *src = kmap(bprm->page[index]) + offset; sp -= PAGE_SIZE - offset; if (copy_to_user((void *) sp, src, PAGE_SIZE - offset) != 0) ret = -EFAULT; kunmap(bprm->page[index]); if (ret) goto out; } *sp_location = sp; out: return ret; } EXPORT_SYMBOL(transfer_args_to_stack); |
1da177e4c Linux-2.6.12-rc2 |
800 |
#endif /* CONFIG_MMU */ |
51f39a1f0 syscalls: impleme... |
801 |
static struct file *do_open_execat(int fd, struct filename *name, int flags) |
1da177e4c Linux-2.6.12-rc2 |
802 |
{ |
1da177e4c Linux-2.6.12-rc2 |
803 |
struct file *file; |
e56b6a5dd Re: [PATCH 3/6] v... |
804 |
int err; |
51f39a1f0 syscalls: impleme... |
805 |
struct open_flags open_exec_flags = { |
47c805dc2 switch do_filp_op... |
806 |
.open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC, |
62fb4a155 don't carry MAY_O... |
807 |
.acc_mode = MAY_EXEC, |
f9652e10c allow build_open_... |
808 809 |
.intent = LOOKUP_OPEN, .lookup_flags = LOOKUP_FOLLOW, |
47c805dc2 switch do_filp_op... |
810 |
}; |
1da177e4c Linux-2.6.12-rc2 |
811 |
|
51f39a1f0 syscalls: impleme... |
812 813 814 815 816 817 818 819 |
if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0) return ERR_PTR(-EINVAL); if (flags & AT_SYMLINK_NOFOLLOW) open_exec_flags.lookup_flags &= ~LOOKUP_FOLLOW; if (flags & AT_EMPTY_PATH) open_exec_flags.lookup_flags |= LOOKUP_EMPTY; file = do_filp_open(fd, name, &open_exec_flags); |
6e8341a11 Switch open_exec(... |
820 |
if (IS_ERR(file)) |
e56b6a5dd Re: [PATCH 3/6] v... |
821 822 823 |
goto out; err = -EACCES; |
496ad9aa8 new helper: file_... |
824 |
if (!S_ISREG(file_inode(file)->i_mode)) |
6e8341a11 Switch open_exec(... |
825 |
goto exit; |
e56b6a5dd Re: [PATCH 3/6] v... |
826 |
|
90f8572b0 vfs: Commit to ne... |
827 |
if (path_noexec(&file->f_path)) |
6e8341a11 Switch open_exec(... |
828 |
goto exit; |
e56b6a5dd Re: [PATCH 3/6] v... |
829 830 |
err = deny_write_access(file); |
6e8341a11 Switch open_exec(... |
831 832 |
if (err) goto exit; |
1da177e4c Linux-2.6.12-rc2 |
833 |
|
51f39a1f0 syscalls: impleme... |
834 835 |
if (name->name[0] != '\0') fsnotify_open(file); |
6e8341a11 Switch open_exec(... |
836 |
out: |
e56b6a5dd Re: [PATCH 3/6] v... |
837 |
return file; |
6e8341a11 Switch open_exec(... |
838 839 |
exit: fput(file); |
e56b6a5dd Re: [PATCH 3/6] v... |
840 841 |
return ERR_PTR(err); } |
c4ad8f98b execve: use 'stru... |
842 843 844 |
struct file *open_exec(const char *name) { |
516891041 fs: create proper... |
845 846 847 848 849 850 851 852 |
struct filename *filename = getname_kernel(name); struct file *f = ERR_CAST(filename); if (!IS_ERR(filename)) { f = do_open_execat(AT_FDCWD, filename, 0); putname(filename); } return f; |
c4ad8f98b execve: use 'stru... |
853 |
} |
1da177e4c Linux-2.6.12-rc2 |
854 |
EXPORT_SYMBOL(open_exec); |
b44a7dfc6 vfs: define a gen... |
855 |
int kernel_read_file(struct file *file, void **buf, loff_t *size, |
bc8ca5b92 vfs: define kerne... |
856 |
loff_t max_size, enum kernel_read_file_id id) |
b44a7dfc6 vfs: define a gen... |
857 858 859 860 861 862 863 |
{ loff_t i_size, pos; ssize_t bytes = 0; int ret; if (!S_ISREG(file_inode(file)->i_mode) || max_size < 0) return -EINVAL; |
7bd698b3c exec: Set file un... |
864 |
ret = deny_write_access(file); |
39eeb4fb9 security: define ... |
865 866 |
if (ret) return ret; |
7bd698b3c exec: Set file un... |
867 |
ret = security_kernel_read_file(file, id); |
39d637af5 vfs: forbid write... |
868 |
if (ret) |
7bd698b3c exec: Set file un... |
869 |
goto out; |
39d637af5 vfs: forbid write... |
870 |
|
b44a7dfc6 vfs: define a gen... |
871 |
i_size = i_size_read(file_inode(file)); |
39d637af5 vfs: forbid write... |
872 873 874 875 |
if (i_size <= 0) { ret = -EINVAL; goto out; } |
691115c35 vfs: require i_si... |
876 877 878 879 |
if (i_size > SIZE_MAX || (max_size > 0 && i_size > max_size)) { ret = -EFBIG; goto out; } |
b44a7dfc6 vfs: define a gen... |
880 |
|
a098ecd2f firmware: support... |
881 882 |
if (id != READING_FIRMWARE_PREALLOC_BUFFER) *buf = vmalloc(i_size); |
39d637af5 vfs: forbid write... |
883 884 885 886 |
if (!*buf) { ret = -ENOMEM; goto out; } |
b44a7dfc6 vfs: define a gen... |
887 888 889 |
pos = 0; while (pos < i_size) { |
bdd1d2d3d fs: fix kernel_re... |
890 |
bytes = kernel_read(file, *buf + pos, i_size - pos, &pos); |
b44a7dfc6 vfs: define a gen... |
891 892 |
if (bytes < 0) { ret = bytes; |
f612acfae exec: Fix mem lea... |
893 |
goto out_free; |
b44a7dfc6 vfs: define a gen... |
894 895 896 897 |
} if (bytes == 0) break; |
b44a7dfc6 vfs: define a gen... |
898 899 900 901 |
} if (pos != i_size) { ret = -EIO; |
39d637af5 vfs: forbid write... |
902 |
goto out_free; |
b44a7dfc6 vfs: define a gen... |
903 |
} |
bc8ca5b92 vfs: define kerne... |
904 |
ret = security_kernel_post_read_file(file, *buf, i_size, id); |
b44a7dfc6 vfs: define a gen... |
905 906 |
if (!ret) *size = pos; |
39d637af5 vfs: forbid write... |
907 |
out_free: |
b44a7dfc6 vfs: define a gen... |
908 |
if (ret < 0) { |
a098ecd2f firmware: support... |
909 910 911 912 |
if (id != READING_FIRMWARE_PREALLOC_BUFFER) { vfree(*buf); *buf = NULL; } |
b44a7dfc6 vfs: define a gen... |
913 |
} |
39d637af5 vfs: forbid write... |
914 915 916 |
out: allow_write_access(file); |
b44a7dfc6 vfs: define a gen... |
917 918 919 |
return ret; } EXPORT_SYMBOL_GPL(kernel_read_file); |
711aab1db vfs: constify pat... |
920 |
int kernel_read_file_from_path(const char *path, void **buf, loff_t *size, |
09596b94f vfs: define kerne... |
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 |
loff_t max_size, enum kernel_read_file_id id) { struct file *file; int ret; if (!path || !*path) return -EINVAL; file = filp_open(path, O_RDONLY, 0); if (IS_ERR(file)) return PTR_ERR(file); ret = kernel_read_file(file, buf, size, max_size, id); fput(file); return ret; } EXPORT_SYMBOL_GPL(kernel_read_file_from_path); |
b844f0ecb vfs: define kerne... |
938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 |
int kernel_read_file_from_fd(int fd, void **buf, loff_t *size, loff_t max_size, enum kernel_read_file_id id) { struct fd f = fdget(fd); int ret = -EBADF; if (!f.file) goto out; ret = kernel_read_file(f.file, buf, size, max_size, id); out: fdput(f); return ret; } EXPORT_SYMBOL_GPL(kernel_read_file_from_fd); |
3dc20cb28 new helper: read_... |
953 954 |
ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len) { |
ec6955798 read_code(): go t... |
955 |
ssize_t res = vfs_read(file, (void __user *)addr, len, &pos); |
3dc20cb28 new helper: read_... |
956 957 958 959 960 |
if (res > 0) flush_icache_range(addr, addr + len); return res; } EXPORT_SYMBOL(read_code); |
1da177e4c Linux-2.6.12-rc2 |
961 962 963 |
static int exec_mmap(struct mm_struct *mm) { struct task_struct *tsk; |
615d6e875 mm: per-thread vm... |
964 |
struct mm_struct *old_mm, *active_mm; |
1da177e4c Linux-2.6.12-rc2 |
965 966 967 968 |
/* Notify parent that we're no longer interested in the old VM */ tsk = current; old_mm = current->mm; |
7d7e93588 exit/exec: Sepera... |
969 |
exec_mm_release(tsk, old_mm); |
1da177e4c Linux-2.6.12-rc2 |
970 971 |
if (old_mm) { |
4fe7efdbd mm: correctly syn... |
972 |
sync_mm_rss(old_mm); |
1da177e4c Linux-2.6.12-rc2 |
973 974 975 976 |
/* * Make sure that if there is a core dump in progress * for the old mm, we get out and die instead of going * through with the exec. We must hold mmap_sem around |
999d9fc16 coredump: move mm... |
977 |
* checking core_state and changing tsk->mm. |
1da177e4c Linux-2.6.12-rc2 |
978 979 |
*/ down_read(&old_mm->mmap_sem); |
999d9fc16 coredump: move mm... |
980 |
if (unlikely(old_mm->core_state)) { |
1da177e4c Linux-2.6.12-rc2 |
981 982 983 984 985 986 |
up_read(&old_mm->mmap_sem); return -EINTR; } } task_lock(tsk); active_mm = tsk->active_mm; |
227a4aadc sched/membarrier:... |
987 |
membarrier_exec_mmap(mm); |
1da177e4c Linux-2.6.12-rc2 |
988 989 990 |
tsk->mm = mm; tsk->active_mm = mm; activate_mm(active_mm, mm); |
615d6e875 mm: per-thread vm... |
991 992 |
tsk->mm->vmacache_seqnum = 0; vmacache_flush(tsk); |
1da177e4c Linux-2.6.12-rc2 |
993 |
task_unlock(tsk); |
1da177e4c Linux-2.6.12-rc2 |
994 995 |
if (old_mm) { up_read(&old_mm->mmap_sem); |
7dddb12c6 BUG_ON() Conversi... |
996 |
BUG_ON(active_mm != old_mm); |
701085b21 exec: move de_thr... |
997 |
setmax_mm_hiwater_rss(&tsk->signal->maxrss, old_mm); |
31a78f23b mm owner: fix rac... |
998 |
mm_update_next_owner(old_mm); |
1da177e4c Linux-2.6.12-rc2 |
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 |
mmput(old_mm); return 0; } mmdrop(active_mm); return 0; } /* * This function makes sure the current process has its own signal table, * so that flush_signal_handlers can later reset the handlers without * disturbing other processes. (Other processes might share the signal * table via the CLONE_SIGHAND option to clone().) */ |
858119e15 [PATCH] Unlinline... |
1012 |
static int de_thread(struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
1013 1014 |
{ struct signal_struct *sig = tsk->signal; |
b2c903b87 exec: simplify th... |
1015 |
struct sighand_struct *oldsighand = tsk->sighand; |
1da177e4c Linux-2.6.12-rc2 |
1016 |
spinlock_t *lock = &oldsighand->siglock; |
1da177e4c Linux-2.6.12-rc2 |
1017 |
|
aafe6c2a2 [PATCH] de_thread... |
1018 |
if (thread_group_empty(tsk)) |
1da177e4c Linux-2.6.12-rc2 |
1019 1020 1021 1022 |
goto no_thread_group; /* * Kill all other threads in the thread group. |
1da177e4c Linux-2.6.12-rc2 |
1023 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1024 |
spin_lock_irq(lock); |
ed5d2cac1 exec: rework the ... |
1025 |
if (signal_group_exit(sig)) { |
1da177e4c Linux-2.6.12-rc2 |
1026 1027 1028 1029 1030 |
/* * Another group action in progress, just * return so that the signal is processed. */ spin_unlock_irq(lock); |
1da177e4c Linux-2.6.12-rc2 |
1031 1032 |
return -EAGAIN; } |
d344193a0 exit: avoid sig->... |
1033 |
|
ed5d2cac1 exec: rework the ... |
1034 |
sig->group_exit_task = tsk; |
d344193a0 exit: avoid sig->... |
1035 1036 1037 |
sig->notify_count = zap_other_threads(tsk); if (!thread_group_leader(tsk)) sig->notify_count--; |
1da177e4c Linux-2.6.12-rc2 |
1038 |
|
d344193a0 exit: avoid sig->... |
1039 |
while (sig->notify_count) { |
d5bbd43d5 exec: make de_thr... |
1040 |
__set_current_state(TASK_KILLABLE); |
1da177e4c Linux-2.6.12-rc2 |
1041 |
spin_unlock_irq(lock); |
a72173ecf Revert "exec: mak... |
1042 |
schedule(); |
08d405c8b fs/: remove calle... |
1043 |
if (__fatal_signal_pending(tsk)) |
d5bbd43d5 exec: make de_thr... |
1044 |
goto killed; |
1da177e4c Linux-2.6.12-rc2 |
1045 1046 |
spin_lock_irq(lock); } |
1da177e4c Linux-2.6.12-rc2 |
1047 1048 1049 1050 1051 1052 1053 |
spin_unlock_irq(lock); /* * At this point all other threads have exited, all we have to * do is to wait for the thread group leader to become inactive, * and to assume its PID: */ |
aafe6c2a2 [PATCH] de_thread... |
1054 |
if (!thread_group_leader(tsk)) { |
8187926bd posix-timers: sim... |
1055 |
struct task_struct *leader = tsk->group_leader; |
6db840fa7 exec: RT sub-thre... |
1056 |
|
6db840fa7 exec: RT sub-thre... |
1057 |
for (;;) { |
780de9dd2 sched/headers, cg... |
1058 |
cgroup_threadgroup_change_begin(tsk); |
6db840fa7 exec: RT sub-thre... |
1059 |
write_lock_irq(&tasklist_lock); |
dfcce791f fs/exec.c:de_thre... |
1060 1061 1062 1063 1064 |
/* * Do this under tasklist_lock to ensure that * exit_notify() can't miss ->group_exit_task */ sig->notify_count = -1; |
6db840fa7 exec: RT sub-thre... |
1065 1066 |
if (likely(leader->exit_state)) break; |
d5bbd43d5 exec: make de_thr... |
1067 |
__set_current_state(TASK_KILLABLE); |
6db840fa7 exec: RT sub-thre... |
1068 |
write_unlock_irq(&tasklist_lock); |
780de9dd2 sched/headers, cg... |
1069 |
cgroup_threadgroup_change_end(tsk); |
a72173ecf Revert "exec: mak... |
1070 |
schedule(); |
08d405c8b fs/: remove calle... |
1071 |
if (__fatal_signal_pending(tsk)) |
d5bbd43d5 exec: make de_thr... |
1072 |
goto killed; |
6db840fa7 exec: RT sub-thre... |
1073 |
} |
1da177e4c Linux-2.6.12-rc2 |
1074 |
|
f5e902817 [PATCH] process a... |
1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 |
/* * The only record we have of the real-time age of a * process, regardless of execs it's done, is start_time. * All the past CPU time is accumulated in signal_struct * from sister threads now dead. But in this non-leader * exec, nothing survives from the original leader thread, * whose birth marks the true age of this process now. * When we take on its identity by switching to its PID, we * also take its birthdate (always earlier than our own). */ |
aafe6c2a2 [PATCH] de_thread... |
1085 |
tsk->start_time = leader->start_time; |
266b7a021 fs/exec.c:de_thre... |
1086 |
tsk->real_start_time = leader->real_start_time; |
f5e902817 [PATCH] process a... |
1087 |
|
bac0abd61 Isolate some expl... |
1088 1089 |
BUG_ON(!same_thread_group(leader, tsk)); BUG_ON(has_group_leader_pid(tsk)); |
1da177e4c Linux-2.6.12-rc2 |
1090 1091 1092 1093 1094 1095 |
/* * An exec() starts a new thread group with the * TGID of the previous thread group. Rehash the * two threads with a switched PID, and release * the former thread group leader: */ |
d73d65293 [PATCH] pidhash: ... |
1096 1097 |
/* Become a process group leader with the old leader's pid. |
c18258c6f [PATCH] pid: Impl... |
1098 1099 |
* The old leader becomes a thread of the this thread group. * Note: The old leader also uses this pid until release_task |
d73d65293 [PATCH] pidhash: ... |
1100 1101 |
* is called. Odd but simple and correct. */ |
aafe6c2a2 [PATCH] de_thread... |
1102 |
tsk->pid = leader->pid; |
3f4185483 fs/exec.c:de_thre... |
1103 |
change_pid(tsk, PIDTYPE_PID, task_pid(leader)); |
6883f81aa pid: Implement PI... |
1104 |
transfer_pid(leader, tsk, PIDTYPE_TGID); |
aafe6c2a2 [PATCH] de_thread... |
1105 1106 |
transfer_pid(leader, tsk, PIDTYPE_PGID); transfer_pid(leader, tsk, PIDTYPE_SID); |
9cd80bbb0 do_wait() optimiz... |
1107 |
|
aafe6c2a2 [PATCH] de_thread... |
1108 |
list_replace_rcu(&leader->tasks, &tsk->tasks); |
9cd80bbb0 do_wait() optimiz... |
1109 |
list_replace_init(&leader->sibling, &tsk->sibling); |
1da177e4c Linux-2.6.12-rc2 |
1110 |
|
aafe6c2a2 [PATCH] de_thread... |
1111 1112 |
tsk->group_leader = tsk; leader->group_leader = tsk; |
de12a7878 [PATCH] de_thread... |
1113 |
|
aafe6c2a2 [PATCH] de_thread... |
1114 |
tsk->exit_signal = SIGCHLD; |
087806b12 redefine thread_g... |
1115 |
leader->exit_signal = -1; |
962b564cf [PATCH] fix do_wa... |
1116 1117 1118 |
BUG_ON(leader->exit_state != EXIT_ZOMBIE); leader->exit_state = EXIT_DEAD; |
eac1b5e57 ptrace: do_wait(t... |
1119 1120 1121 1122 1123 1124 1125 1126 |
/* * We are going to release_task()->ptrace_unlink() silently, * the tracer can sleep in do_wait(). EXIT_DEAD guarantees * the tracer wont't block again waiting for this thread. */ if (unlikely(leader->ptrace)) __wake_up_parent(leader, leader->parent); |
1da177e4c Linux-2.6.12-rc2 |
1127 |
write_unlock_irq(&tasklist_lock); |
780de9dd2 sched/headers, cg... |
1128 |
cgroup_threadgroup_change_end(tsk); |
8187926bd posix-timers: sim... |
1129 1130 |
release_task(leader); |
ed5d2cac1 exec: rework the ... |
1131 |
} |
1da177e4c Linux-2.6.12-rc2 |
1132 |
|
6db840fa7 exec: RT sub-thre... |
1133 1134 |
sig->group_exit_task = NULL; sig->notify_count = 0; |
1da177e4c Linux-2.6.12-rc2 |
1135 1136 |
no_thread_group: |
e63682534 exit_signal: simp... |
1137 1138 |
/* we have changed execution domain */ tsk->exit_signal = SIGCHLD; |
baa73d9e4 posix-timers: Mak... |
1139 |
#ifdef CONFIG_POSIX_TIMERS |
1da177e4c Linux-2.6.12-rc2 |
1140 |
exit_itimers(sig); |
cbaffba12 posix timers: dis... |
1141 |
flush_itimer_signals(); |
baa73d9e4 posix-timers: Mak... |
1142 |
#endif |
329f7dba5 [PATCH] fix de_th... |
1143 |
|
d036bda7d sched/core: Conve... |
1144 |
if (refcount_read(&oldsighand->count) != 1) { |
b2c903b87 exec: simplify th... |
1145 |
struct sighand_struct *newsighand; |
1da177e4c Linux-2.6.12-rc2 |
1146 |
/* |
b2c903b87 exec: simplify th... |
1147 1148 |
* This ->sighand is shared with the CLONE_SIGHAND * but not CLONE_THREAD task, switch to the new one. |
1da177e4c Linux-2.6.12-rc2 |
1149 |
*/ |
b2c903b87 exec: simplify th... |
1150 1151 1152 |
newsighand = kmem_cache_alloc(sighand_cachep, GFP_KERNEL); if (!newsighand) return -ENOMEM; |
d036bda7d sched/core: Conve... |
1153 |
refcount_set(&newsighand->count, 1); |
1da177e4c Linux-2.6.12-rc2 |
1154 1155 1156 1157 1158 |
memcpy(newsighand->action, oldsighand->action, sizeof(newsighand->action)); write_lock_irq(&tasklist_lock); spin_lock(&oldsighand->siglock); |
aafe6c2a2 [PATCH] de_thread... |
1159 |
rcu_assign_pointer(tsk->sighand, newsighand); |
1da177e4c Linux-2.6.12-rc2 |
1160 1161 |
spin_unlock(&oldsighand->siglock); write_unlock_irq(&tasklist_lock); |
fba2afaae signal/timer/even... |
1162 |
__cleanup_sighand(oldsighand); |
1da177e4c Linux-2.6.12-rc2 |
1163 |
} |
aafe6c2a2 [PATCH] de_thread... |
1164 |
BUG_ON(!thread_group_leader(tsk)); |
1da177e4c Linux-2.6.12-rc2 |
1165 |
return 0; |
d5bbd43d5 exec: make de_thr... |
1166 1167 1168 1169 1170 1171 1172 1173 |
killed: /* protects against exit_notify() and __exit_signal() */ read_lock(&tasklist_lock); sig->group_exit_task = NULL; sig->notify_count = 0; read_unlock(&tasklist_lock); return -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1174 |
} |
0840a90d9 exec: simplify ->... |
1175 |
|
3756f6401 exec: avoid gcc-8... |
1176 |
char *__get_task_comm(char *buf, size_t buf_size, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
1177 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1178 |
task_lock(tsk); |
3756f6401 exec: avoid gcc-8... |
1179 |
strncpy(buf, tsk->comm, buf_size); |
1da177e4c Linux-2.6.12-rc2 |
1180 |
task_unlock(tsk); |
59714d65d get_task_comm(): ... |
1181 |
return buf; |
1da177e4c Linux-2.6.12-rc2 |
1182 |
} |
3756f6401 exec: avoid gcc-8... |
1183 |
EXPORT_SYMBOL_GPL(__get_task_comm); |
1da177e4c Linux-2.6.12-rc2 |
1184 |
|
6a6d27de3 take close-on-exe... |
1185 1186 1187 1188 |
/* * These functions flushes out all traces of the currently running executable * so that a new one can be started */ |
82b897782 perf: Differentia... |
1189 |
void __set_task_comm(struct task_struct *tsk, const char *buf, bool exec) |
1da177e4c Linux-2.6.12-rc2 |
1190 1191 |
{ task_lock(tsk); |
43d2b1132 tracepoint: add t... |
1192 |
trace_task_rename(tsk, buf); |
1da177e4c Linux-2.6.12-rc2 |
1193 1194 |
strlcpy(tsk->comm, buf, sizeof(tsk->comm)); task_unlock(tsk); |
82b897782 perf: Differentia... |
1195 |
perf_event_comm(tsk, exec); |
1da177e4c Linux-2.6.12-rc2 |
1196 |
} |
a9208e42b exec: Correct com... |
1197 1198 1199 1200 1201 1202 |
/* * Calling this is the point of no return. None of the failures will be * seen by userspace since either the process is already taking a fatal * signal (via de_thread() or coredump), or will have SEGV raised * (after exec_mmap()) by search_binary_handlers (see below). */ |
1da177e4c Linux-2.6.12-rc2 |
1203 1204 |
int flush_old_exec(struct linux_binprm * bprm) { |
221af7f87 Split 'flush_old_... |
1205 |
int retval; |
1da177e4c Linux-2.6.12-rc2 |
1206 1207 1208 1209 1210 1211 1212 1213 |
/* * Make sure we have a private signal table and that * we are unassociated from the previous thread group. */ retval = de_thread(current); if (retval) goto out; |
6e399cd14 prctl: avoid usin... |
1214 1215 1216 1217 1218 |
/* * Must be called _before_ exec_mmap() as bprm->mm is * not visibile until then. This also enables the update * to be lockless. */ |
925d1c401 procfs task exe s... |
1219 |
set_mm_exe_file(bprm->mm, bprm->file); |
6e399cd14 prctl: avoid usin... |
1220 |
|
1da177e4c Linux-2.6.12-rc2 |
1221 |
/* |
1da177e4c Linux-2.6.12-rc2 |
1222 1223 |
* Release all of the old mmap stuff */ |
3c77f8457 exec: make argv/e... |
1224 |
acct_arg_size(bprm, 0); |
1da177e4c Linux-2.6.12-rc2 |
1225 1226 |
retval = exec_mmap(bprm->mm); if (retval) |
fd8328be8 [PATCH] sanitize ... |
1227 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1228 |
|
a9208e42b exec: Correct com... |
1229 1230 1231 1232 1233 1234 1235 |
/* * After clearing bprm->mm (to mark that current is using the * prepared mm now), we have nothing left of the original * process. If anything from here on returns an error, the check * in search_binary_handler() will SEGV current. */ bprm->mm = NULL; |
7ab02af42 Fix 'flush_old_ex... |
1236 |
|
dac853ae8 exec: delay addre... |
1237 |
set_fs(USER_DS); |
b88fae644 exec: avoid propa... |
1238 1239 |
current->flags &= ~(PF_RANDOMIZE | PF_FORKNOEXEC | PF_KTHREAD | PF_NOFREEZE | PF_NO_SETAFFINITY); |
7ab02af42 Fix 'flush_old_ex... |
1240 1241 |
flush_thread(); current->personality &= ~bprm->per_clear; |
613cc2b6f fs: exec: apply C... |
1242 1243 1244 1245 1246 1247 1248 |
/* * We have to apply CLOEXEC before we change whether the process is * dumpable (in setup_new_exec) to avoid a race with a process in userspace * trying to access the should-be-closed file descriptors of a process * undergoing exec(2). */ do_close_on_exec(current->files); |
221af7f87 Split 'flush_old_... |
1249 1250 1251 1252 1253 1254 |
return 0; out: return retval; } EXPORT_SYMBOL(flush_old_exec); |
1b5d783c9 consolidate BINPR... |
1255 1256 |
void would_dump(struct linux_binprm *bprm, struct file *file) { |
f84df2a6f exec: Ensure mm->... |
1257 1258 1259 |
struct inode *inode = file_inode(file); if (inode_permission(inode, MAY_READ) < 0) { struct user_namespace *old, *user_ns; |
1b5d783c9 consolidate BINPR... |
1260 |
bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; |
f84df2a6f exec: Ensure mm->... |
1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 |
/* Ensure mm->user_ns contains the executable */ user_ns = old = bprm->mm->user_ns; while ((user_ns != &init_user_ns) && !privileged_wrt_inode_uidgid(user_ns, inode)) user_ns = user_ns->parent; if (old != user_ns) { bprm->mm->user_ns = get_user_ns(user_ns); put_user_ns(old); } } |
1b5d783c9 consolidate BINPR... |
1273 1274 |
} EXPORT_SYMBOL(would_dump); |
221af7f87 Split 'flush_old_... |
1275 1276 |
void setup_new_exec(struct linux_binprm * bprm) { |
46d98eb4e commoncap: Refact... |
1277 1278 1279 1280 1281 1282 |
/* * Once here, prepare_binrpm() will not be called any more, so * the final state of setuid/setgid/fscaps can be merged into the * secureexec flag. */ bprm->secureexec |= bprm->cap_elevated; |
64701dee4 exec: Use sane st... |
1283 |
if (bprm->secureexec) { |
fe8993b3a exec: Consolidate... |
1284 1285 |
/* Make sure parent cannot signal privileged process. */ current->pdeath_signal = 0; |
64701dee4 exec: Use sane st... |
1286 1287 1288 1289 1290 |
/* * For secureexec, reset the stack limit to sane default to * avoid bad behavior from the prior rlimits. This has to * happen before arch_pick_mmap_layout(), which examines * RLIMIT_STACK, but after the point of no return to avoid |
779f4e1c6 Revert "exec: avo... |
1291 |
* needing to clean up the change on failure. |
64701dee4 exec: Use sane st... |
1292 |
*/ |
c31dbb146 exec: pin stack l... |
1293 1294 |
if (bprm->rlim_stack.rlim_cur > _STK_LIM) bprm->rlim_stack.rlim_cur = _STK_LIM; |
64701dee4 exec: Use sane st... |
1295 |
} |
c31dbb146 exec: pin stack l... |
1296 |
arch_pick_mmap_layout(current->mm, &bprm->rlim_stack); |
1da177e4c Linux-2.6.12-rc2 |
1297 |
|
1da177e4c Linux-2.6.12-rc2 |
1298 |
current->sas_ss_sp = current->sas_ss_size = 0; |
e816c201a exec: Weaken dump... |
1299 1300 1301 1302 1303 |
/* * Figure out dumpability. Note that this checking only of current * is wrong, but userspace depends on it. This should be testing * bprm->secureexec instead. */ |
473d89639 exec: Consolidate... |
1304 |
if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP || |
e816c201a exec: Weaken dump... |
1305 1306 |
!(uid_eq(current_euid(), current_uid()) && gid_eq(current_egid(), current_gid()))) |
6c5d52382 coredump masking:... |
1307 |
set_dumpable(current->mm, suid_dumpable); |
473d89639 exec: Consolidate... |
1308 1309 |
else set_dumpable(current->mm, SUID_DUMP_USER); |
d6e711448 [PATCH] setuid co... |
1310 |
|
e9ea1e7f5 x86/arch_prctl: A... |
1311 |
arch_setup_new_exec(); |
e041e328c perf: Fix perf_ev... |
1312 |
perf_event_exec(); |
82b897782 perf: Differentia... |
1313 |
__set_task_comm(current, kbasename(bprm->filename), true); |
1da177e4c Linux-2.6.12-rc2 |
1314 |
|
0551fbd29 [PATCH] Add mm->t... |
1315 1316 1317 1318 1319 |
/* Set the new mm task size. We have to do that late because it may * depend on TIF_32BIT which is only updated in flush_thread() on * some architectures like powerpc */ current->mm->task_size = TASK_SIZE; |
1da177e4c Linux-2.6.12-rc2 |
1320 1321 |
/* An exec changes our domain. We are no longer part of the thread group */ |
1da177e4c Linux-2.6.12-rc2 |
1322 |
current->self_exec_id++; |
1da177e4c Linux-2.6.12-rc2 |
1323 |
flush_signal_handlers(current, 0); |
1da177e4c Linux-2.6.12-rc2 |
1324 |
} |
221af7f87 Split 'flush_old_... |
1325 |
EXPORT_SYMBOL(setup_new_exec); |
1da177e4c Linux-2.6.12-rc2 |
1326 |
|
b83838313 exec: introduce f... |
1327 1328 1329 |
/* Runs immediately before start_thread() takes over. */ void finalize_exec(struct linux_binprm *bprm) { |
c31dbb146 exec: pin stack l... |
1330 1331 1332 1333 |
/* Store any stack rlimit changes before starting thread. */ task_lock(current->group_leader); current->signal->rlim[RLIMIT_STACK] = bprm->rlim_stack; task_unlock(current->group_leader); |
b83838313 exec: introduce f... |
1334 1335 |
} EXPORT_SYMBOL(finalize_exec); |
a6f76f23d CRED: Make execve... |
1336 |
/* |
a2a8474c3 exec: do not slee... |
1337 1338 1339 1340 1341 |
* Prepare credentials and lock ->cred_guard_mutex. * install_exec_creds() commits the new creds and drops the lock. * Or, if exec fails before, free_bprm() should release ->cred and * and unlock. */ |
4addd2640 exec: make prepar... |
1342 |
static int prepare_bprm_creds(struct linux_binprm *bprm) |
a2a8474c3 exec: do not slee... |
1343 |
{ |
9b1bf12d5 signals: move cre... |
1344 |
if (mutex_lock_interruptible(¤t->signal->cred_guard_mutex)) |
a2a8474c3 exec: do not slee... |
1345 1346 1347 1348 1349 |
return -ERESTARTNOINTR; bprm->cred = prepare_exec_creds(); if (likely(bprm->cred)) return 0; |
9b1bf12d5 signals: move cre... |
1350 |
mutex_unlock(¤t->signal->cred_guard_mutex); |
a2a8474c3 exec: do not slee... |
1351 1352 |
return -ENOMEM; } |
c4ad8f98b execve: use 'stru... |
1353 |
static void free_bprm(struct linux_binprm *bprm) |
a2a8474c3 exec: do not slee... |
1354 1355 1356 |
{ free_arg_pages(bprm); if (bprm->cred) { |
9b1bf12d5 signals: move cre... |
1357 |
mutex_unlock(¤t->signal->cred_guard_mutex); |
a2a8474c3 exec: do not slee... |
1358 1359 |
abort_creds(bprm->cred); } |
63e46b95e exec: move the fi... |
1360 1361 1362 1363 |
if (bprm->file) { allow_write_access(bprm->file); fput(bprm->file); } |
b66c59840 exec: do not leav... |
1364 1365 1366 |
/* If a binfmt changed the interp, free it. */ if (bprm->interp != bprm->filename) kfree(bprm->interp); |
a2a8474c3 exec: do not slee... |
1367 1368 |
kfree(bprm); } |
c2315c187 exec: load_script... |
1369 |
int bprm_change_interp(const char *interp, struct linux_binprm *bprm) |
b66c59840 exec: do not leav... |
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 |
{ /* If a binfmt changed the interp, free it first. */ if (bprm->interp != bprm->filename) kfree(bprm->interp); bprm->interp = kstrdup(interp, GFP_KERNEL); if (!bprm->interp) return -ENOMEM; return 0; } EXPORT_SYMBOL(bprm_change_interp); |
a2a8474c3 exec: do not slee... |
1380 |
/* |
a6f76f23d CRED: Make execve... |
1381 1382 1383 1384 1385 1386 1387 1388 |
* install the new credentials for this executable */ void install_exec_creds(struct linux_binprm *bprm) { security_bprm_committing_creds(bprm); commit_creds(bprm->cred); bprm->cred = NULL; |
2976b10f0 perf: Disable mon... |
1389 1390 1391 1392 1393 1394 1395 1396 1397 |
/* * Disable monitoring for regular users * when executing setuid binaries. Must * wait until new credentials are committed * by commit_creds() above */ if (get_dumpable(current->mm) != SUID_DUMP_USER) perf_event_exit_task(current); |
a2a8474c3 exec: do not slee... |
1398 1399 |
/* * cred_guard_mutex must be held at least to this point to prevent |
a6f76f23d CRED: Make execve... |
1400 |
* ptrace_attach() from altering our determination of the task's |
a2a8474c3 exec: do not slee... |
1401 1402 |
* credentials; any time after this it may be unlocked. */ |
a6f76f23d CRED: Make execve... |
1403 |
security_bprm_committed_creds(bprm); |
9b1bf12d5 signals: move cre... |
1404 |
mutex_unlock(¤t->signal->cred_guard_mutex); |
a6f76f23d CRED: Make execve... |
1405 1406 1407 1408 1409 |
} EXPORT_SYMBOL(install_exec_creds); /* * determine how safe it is to execute the proposed program |
9b1bf12d5 signals: move cre... |
1410 |
* - the caller must hold ->cred_guard_mutex to protect against |
c2e1f2e30 seccomp: implemen... |
1411 |
* PTRACE_ATTACH or seccomp thread-sync |
a6f76f23d CRED: Make execve... |
1412 |
*/ |
9e00cdb09 exec:check_unsafe... |
1413 |
static void check_unsafe_exec(struct linux_binprm *bprm) |
a6f76f23d CRED: Make execve... |
1414 |
{ |
0bf2f3aec CRED: Fix SUID ex... |
1415 |
struct task_struct *p = current, *t; |
f1191b50e check_unsafe_exec... |
1416 |
unsigned n_fs; |
a6f76f23d CRED: Make execve... |
1417 |
|
9227dd2a8 exec: Remove LSM_... |
1418 1419 |
if (p->ptrace) bprm->unsafe |= LSM_UNSAFE_PTRACE; |
a6f76f23d CRED: Make execve... |
1420 |
|
259e5e6c7 Add PR_{GET,SET}_... |
1421 1422 1423 1424 |
/* * This isn't strictly necessary, but it makes it harder for LSMs to * mess up. */ |
1d4457f99 sched: move no_ne... |
1425 |
if (task_no_new_privs(current)) |
259e5e6c7 Add PR_{GET,SET}_... |
1426 |
bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS; |
83f62a2ea exec:check_unsafe... |
1427 |
t = p; |
0bf2f3aec CRED: Fix SUID ex... |
1428 |
n_fs = 1; |
2a4419b5b fs: fs_struct rwl... |
1429 |
spin_lock(&p->fs->lock); |
437f7fdb6 check_unsafe_exec... |
1430 |
rcu_read_lock(); |
83f62a2ea exec:check_unsafe... |
1431 |
while_each_thread(p, t) { |
0bf2f3aec CRED: Fix SUID ex... |
1432 1433 |
if (t->fs == p->fs) n_fs++; |
0bf2f3aec CRED: Fix SUID ex... |
1434 |
} |
437f7fdb6 check_unsafe_exec... |
1435 |
rcu_read_unlock(); |
0bf2f3aec CRED: Fix SUID ex... |
1436 |
|
9e00cdb09 exec:check_unsafe... |
1437 |
if (p->fs->users > n_fs) |
a6f76f23d CRED: Make execve... |
1438 |
bprm->unsafe |= LSM_UNSAFE_SHARE; |
9e00cdb09 exec:check_unsafe... |
1439 1440 |
else p->fs->in_exec = 1; |
2a4419b5b fs: fs_struct rwl... |
1441 |
spin_unlock(&p->fs->lock); |
a6f76f23d CRED: Make execve... |
1442 |
} |
8b01fc86b fs: take i_mutex ... |
1443 1444 1445 1446 1447 1448 |
static void bprm_fill_uid(struct linux_binprm *bprm) { struct inode *inode; unsigned int mode; kuid_t uid; kgid_t gid; |
cb6fd68fd exec: clarify rea... |
1449 1450 1451 1452 1453 1454 |
/* * Since this can be called multiple times (via prepare_binprm), * we must clear any previous work done when setting set[ug]id * bits from any earlier bprm->file uses (for example when run * first for a setuid script then again for its interpreter). */ |
8b01fc86b fs: take i_mutex ... |
1455 1456 |
bprm->cred->euid = current_euid(); bprm->cred->egid = current_egid(); |
380cf5ba6 fs: Treat foreign... |
1457 |
if (!mnt_may_suid(bprm->file->f_path.mnt)) |
8b01fc86b fs: take i_mutex ... |
1458 1459 1460 1461 |
return; if (task_no_new_privs(current)) return; |
fea6d2a61 vfs: Use upper fi... |
1462 |
inode = bprm->file->f_path.dentry->d_inode; |
8b01fc86b fs: take i_mutex ... |
1463 1464 1465 1466 1467 |
mode = READ_ONCE(inode->i_mode); if (!(mode & (S_ISUID|S_ISGID))) return; /* Be careful if suid/sgid is set */ |
5955102c9 wrappers for ->i_... |
1468 |
inode_lock(inode); |
8b01fc86b fs: take i_mutex ... |
1469 1470 1471 1472 1473 |
/* reload atomically mode/uid/gid now that lock held */ mode = inode->i_mode; uid = inode->i_uid; gid = inode->i_gid; |
5955102c9 wrappers for ->i_... |
1474 |
inode_unlock(inode); |
8b01fc86b fs: take i_mutex ... |
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 |
/* We ignore suid/sgid if there are no mappings for them in the ns */ if (!kuid_has_mapping(bprm->cred->user_ns, uid) || !kgid_has_mapping(bprm->cred->user_ns, gid)) return; if (mode & S_ISUID) { bprm->per_clear |= PER_CLEAR_ON_SETID; bprm->cred->euid = uid; } if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { bprm->per_clear |= PER_CLEAR_ON_SETID; bprm->cred->egid = gid; } } |
9e00cdb09 exec:check_unsafe... |
1491 1492 |
/* * Fill the binprm structure from the inode. |
6eb3c3d0a exec: increase BI... |
1493 |
* Check permissions, then read the first BINPRM_BUF_SIZE bytes |
a6f76f23d CRED: Make execve... |
1494 1495 |
* * This may be called multiple times for binary chains (scripts for example). |
1da177e4c Linux-2.6.12-rc2 |
1496 1497 1498 |
*/ int prepare_binprm(struct linux_binprm *bprm) { |
1da177e4c Linux-2.6.12-rc2 |
1499 |
int retval; |
bdd1d2d3d fs: fix kernel_re... |
1500 |
loff_t pos = 0; |
1da177e4c Linux-2.6.12-rc2 |
1501 |
|
8b01fc86b fs: take i_mutex ... |
1502 |
bprm_fill_uid(bprm); |
1da177e4c Linux-2.6.12-rc2 |
1503 1504 |
/* fill in binprm security blob */ |
a6f76f23d CRED: Make execve... |
1505 |
retval = security_bprm_set_creds(bprm); |
1da177e4c Linux-2.6.12-rc2 |
1506 1507 |
if (retval) return retval; |
ddb4a1442 exec: Rename bprm... |
1508 |
bprm->called_set_creds = 1; |
1da177e4c Linux-2.6.12-rc2 |
1509 |
|
a6f76f23d CRED: Make execve... |
1510 |
memset(bprm->buf, 0, BINPRM_BUF_SIZE); |
bdd1d2d3d fs: fix kernel_re... |
1511 |
return kernel_read(bprm->file, bprm->buf, BINPRM_BUF_SIZE, &pos); |
1da177e4c Linux-2.6.12-rc2 |
1512 1513 1514 |
} EXPORT_SYMBOL(prepare_binprm); |
4fc75ff48 exec: fix remove_... |
1515 1516 1517 1518 1519 |
/* * Arguments are '\0' separated strings found at the location bprm->p * points to; chop off the first by relocating brpm->p to right after * the first '\0' encountered. */ |
b6a2fea39 mm: variable leng... |
1520 |
int remove_arg_zero(struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
1521 |
{ |
b6a2fea39 mm: variable leng... |
1522 1523 1524 1525 |
int ret = 0; unsigned long offset; char *kaddr; struct page *page; |
4fc75ff48 exec: fix remove_... |
1526 |
|
b6a2fea39 mm: variable leng... |
1527 1528 |
if (!bprm->argc) return 0; |
1da177e4c Linux-2.6.12-rc2 |
1529 |
|
b6a2fea39 mm: variable leng... |
1530 1531 1532 1533 1534 1535 1536 |
do { offset = bprm->p & ~PAGE_MASK; page = get_arg_page(bprm, bprm->p, 0); if (!page) { ret = -EFAULT; goto out; } |
e8e3c3d66 fs: remove the se... |
1537 |
kaddr = kmap_atomic(page); |
4fc75ff48 exec: fix remove_... |
1538 |
|
b6a2fea39 mm: variable leng... |
1539 1540 1541 |
for (; offset < PAGE_SIZE && kaddr[offset]; offset++, bprm->p++) ; |
4fc75ff48 exec: fix remove_... |
1542 |
|
e8e3c3d66 fs: remove the se... |
1543 |
kunmap_atomic(kaddr); |
b6a2fea39 mm: variable leng... |
1544 |
put_arg_page(page); |
b6a2fea39 mm: variable leng... |
1545 |
} while (offset == PAGE_SIZE); |
4fc75ff48 exec: fix remove_... |
1546 |
|
b6a2fea39 mm: variable leng... |
1547 1548 1549 |
bprm->p++; bprm->argc--; ret = 0; |
4fc75ff48 exec: fix remove_... |
1550 |
|
b6a2fea39 mm: variable leng... |
1551 1552 |
out: return ret; |
1da177e4c Linux-2.6.12-rc2 |
1553 |
} |
1da177e4c Linux-2.6.12-rc2 |
1554 |
EXPORT_SYMBOL(remove_arg_zero); |
cb7b6b1cb exec: cleanup the... |
1555 1556 |
#define printable(c) (((c)=='\t') || ((c)==' ') || (0x20<=(c) && (c)<=0x7e)) |
1da177e4c Linux-2.6.12-rc2 |
1557 1558 1559 |
/* * cycle the list of binary formats handler, until one recognizes the image */ |
3c456bfc4 get rid of pt_reg... |
1560 |
int search_binary_handler(struct linux_binprm *bprm) |
1da177e4c Linux-2.6.12-rc2 |
1561 |
{ |
cb7b6b1cb exec: cleanup the... |
1562 |
bool need_retry = IS_ENABLED(CONFIG_MODULES); |
1da177e4c Linux-2.6.12-rc2 |
1563 |
struct linux_binfmt *fmt; |
cb7b6b1cb exec: cleanup the... |
1564 |
int retval; |
1da177e4c Linux-2.6.12-rc2 |
1565 |
|
d74026986 exec: use -ELOOP ... |
1566 |
/* This allows 4 levels of binfmt rewrites before failing hard. */ |
131b2f9f1 exec: kill "int d... |
1567 |
if (bprm->recursion_depth > 5) |
d74026986 exec: use -ELOOP ... |
1568 |
return -ELOOP; |
1da177e4c Linux-2.6.12-rc2 |
1569 1570 1571 |
retval = security_bprm_check(bprm); if (retval) return retval; |
1da177e4c Linux-2.6.12-rc2 |
1572 |
retval = -ENOENT; |
cb7b6b1cb exec: cleanup the... |
1573 1574 1575 1576 1577 1578 |
retry: read_lock(&binfmt_lock); list_for_each_entry(fmt, &formats, lh) { if (!try_module_get(fmt->module)) continue; read_unlock(&binfmt_lock); |
d53ddd018 fs/exec.c: move -... |
1579 |
|
cb7b6b1cb exec: cleanup the... |
1580 1581 |
bprm->recursion_depth++; retval = fmt->load_binary(bprm); |
d53ddd018 fs/exec.c: move -... |
1582 |
bprm->recursion_depth--; |
19d860a14 handle suicide on... |
1583 1584 |
read_lock(&binfmt_lock); put_binfmt(fmt); |
19d860a14 handle suicide on... |
1585 1586 1587 |
if (retval < 0 && !bprm->mm) { /* we got to flush_old_exec() and failed after it */ read_unlock(&binfmt_lock); |
cb44c9a0a signal: Remove ta... |
1588 |
force_sigsegv(SIGSEGV); |
19d860a14 handle suicide on... |
1589 1590 1591 1592 |
return retval; } if (retval != -ENOEXEC || !bprm->file) { read_unlock(&binfmt_lock); |
cb7b6b1cb exec: cleanup the... |
1593 |
return retval; |
1da177e4c Linux-2.6.12-rc2 |
1594 |
} |
1da177e4c Linux-2.6.12-rc2 |
1595 |
} |
cb7b6b1cb exec: cleanup the... |
1596 |
read_unlock(&binfmt_lock); |
19d860a14 handle suicide on... |
1597 |
if (need_retry) { |
cb7b6b1cb exec: cleanup the... |
1598 1599 1600 |
if (printable(bprm->buf[0]) && printable(bprm->buf[1]) && printable(bprm->buf[2]) && printable(bprm->buf[3])) return retval; |
4e0621a07 exec: don't retry... |
1601 1602 |
if (request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)) < 0) return retval; |
cb7b6b1cb exec: cleanup the... |
1603 1604 1605 |
need_retry = false; goto retry; } |
1da177e4c Linux-2.6.12-rc2 |
1606 1607 |
return retval; } |
1da177e4c Linux-2.6.12-rc2 |
1608 |
EXPORT_SYMBOL(search_binary_handler); |
5d1baf3b6 exec: introduce e... |
1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 |
static int exec_binprm(struct linux_binprm *bprm) { pid_t old_pid, old_vpid; int ret; /* Need to fetch pid before load_binary changes it */ old_pid = current->pid; rcu_read_lock(); old_vpid = task_pid_nr_ns(current, task_active_pid_ns(current->parent)); rcu_read_unlock(); ret = search_binary_handler(bprm); if (ret >= 0) { |
3eaded86a Merge git://git.i... |
1622 |
audit_bprm(bprm); |
5d1baf3b6 exec: introduce e... |
1623 1624 |
trace_sched_process_exec(current, old_pid, bprm); ptrace_event(PTRACE_EVENT_EXEC, old_vpid); |
9beb266f2 exec: proc_exec_c... |
1625 |
proc_exec_connector(current); |
5d1baf3b6 exec: introduce e... |
1626 1627 1628 1629 |
} return ret; } |
1da177e4c Linux-2.6.12-rc2 |
1630 1631 1632 |
/* * sys_execve() executes a new program. */ |
449325b52 umh: introduce fo... |
1633 1634 1635 1636 |
static int __do_execve_file(int fd, struct filename *filename, struct user_arg_ptr argv, struct user_arg_ptr envp, int flags, struct file *file) |
1da177e4c Linux-2.6.12-rc2 |
1637 |
{ |
51f39a1f0 syscalls: impleme... |
1638 |
char *pathbuf = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1639 |
struct linux_binprm *bprm; |
3b1253880 [PATCH] sanitize ... |
1640 |
struct files_struct *displaced; |
1da177e4c Linux-2.6.12-rc2 |
1641 |
int retval; |
72fa59970 move RLIMIT_NPROC... |
1642 |
|
c4ad8f98b execve: use 'stru... |
1643 1644 |
if (IS_ERR(filename)) return PTR_ERR(filename); |
72fa59970 move RLIMIT_NPROC... |
1645 1646 1647 1648 1649 1650 1651 |
/* * We move the actual failure in case of RLIMIT_NPROC excess from * set*uid() to execve() because too many poorly written programs * don't check setuid() return code. Here we additionally recheck * whether NPROC limit is still exceeded. */ if ((current->flags & PF_NPROC_EXCEEDED) && |
bd9d43f47 fs/exec.c: do_exe... |
1652 |
atomic_read(¤t_user()->processes) > rlimit(RLIMIT_NPROC)) { |
72fa59970 move RLIMIT_NPROC... |
1653 1654 1655 1656 1657 1658 1659 |
retval = -EAGAIN; goto out_ret; } /* We're below the limit (still or again), so we don't want to make * further execve() calls fail. */ current->flags &= ~PF_NPROC_EXCEEDED; |
1da177e4c Linux-2.6.12-rc2 |
1660 |
|
3b1253880 [PATCH] sanitize ... |
1661 |
retval = unshare_files(&displaced); |
fd8328be8 [PATCH] sanitize ... |
1662 1663 |
if (retval) goto out_ret; |
1da177e4c Linux-2.6.12-rc2 |
1664 |
retval = -ENOMEM; |
11b0b5abb [PATCH] use kzall... |
1665 |
bprm = kzalloc(sizeof(*bprm), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1666 |
if (!bprm) |
fd8328be8 [PATCH] sanitize ... |
1667 |
goto out_files; |
1da177e4c Linux-2.6.12-rc2 |
1668 |
|
a2a8474c3 exec: do not slee... |
1669 1670 |
retval = prepare_bprm_creds(bprm); if (retval) |
a6f76f23d CRED: Make execve... |
1671 |
goto out_free; |
498052bba New locking/refco... |
1672 |
|
9e00cdb09 exec:check_unsafe... |
1673 |
check_unsafe_exec(bprm); |
a2a8474c3 exec: do not slee... |
1674 |
current->in_execve = 1; |
a6f76f23d CRED: Make execve... |
1675 |
|
449325b52 umh: introduce fo... |
1676 1677 |
if (!file) file = do_open_execat(fd, filename, flags); |
1da177e4c Linux-2.6.12-rc2 |
1678 1679 |
retval = PTR_ERR(file); if (IS_ERR(file)) |
498052bba New locking/refco... |
1680 |
goto out_unmark; |
1da177e4c Linux-2.6.12-rc2 |
1681 1682 |
sched_exec(); |
1da177e4c Linux-2.6.12-rc2 |
1683 |
bprm->file = file; |
449325b52 umh: introduce fo... |
1684 1685 1686 |
if (!filename) { bprm->filename = "none"; } else if (fd == AT_FDCWD || filename->name[0] == '/') { |
51f39a1f0 syscalls: impleme... |
1687 1688 1689 |
bprm->filename = filename->name; } else { if (filename->name[0] == '\0') |
0ee931c4e mm: treewide: rem... |
1690 |
pathbuf = kasprintf(GFP_KERNEL, "/dev/fd/%d", fd); |
51f39a1f0 syscalls: impleme... |
1691 |
else |
0ee931c4e mm: treewide: rem... |
1692 |
pathbuf = kasprintf(GFP_KERNEL, "/dev/fd/%d/%s", |
51f39a1f0 syscalls: impleme... |
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 |
fd, filename->name); if (!pathbuf) { retval = -ENOMEM; goto out_unmark; } /* * Record that a name derived from an O_CLOEXEC fd will be * inaccessible after exec. Relies on having exclusive access to * current->files (due to unshare_files above). */ if (close_on_exec(fd, rcu_dereference_raw(current->files->fdt))) bprm->interp_flags |= BINPRM_FLAGS_PATH_INACCESSIBLE; bprm->filename = pathbuf; } bprm->interp = bprm->filename; |
1da177e4c Linux-2.6.12-rc2 |
1708 |
|
b6a2fea39 mm: variable leng... |
1709 1710 |
retval = bprm_mm_init(bprm); if (retval) |
63e46b95e exec: move the fi... |
1711 |
goto out_unmark; |
1da177e4c Linux-2.6.12-rc2 |
1712 |
|
655c16a8c exec: separate MM... |
1713 1714 |
retval = prepare_arg_pages(bprm, argv, envp); if (retval < 0) |
1da177e4c Linux-2.6.12-rc2 |
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 |
goto out; retval = prepare_binprm(bprm); if (retval < 0) goto out; retval = copy_strings_kernel(1, &bprm->filename, bprm); if (retval < 0) goto out; bprm->exec = bprm->p; retval = copy_strings(bprm->envc, envp, bprm); if (retval < 0) goto out; retval = copy_strings(bprm->argc, argv, bprm); if (retval < 0) goto out; |
f84df2a6f exec: Ensure mm->... |
1733 |
would_dump(bprm, bprm->file); |
5d1baf3b6 exec: introduce e... |
1734 |
retval = exec_binprm(bprm); |
a6f76f23d CRED: Make execve... |
1735 1736 |
if (retval < 0) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1737 |
|
a6f76f23d CRED: Make execve... |
1738 |
/* execve succeeded */ |
498052bba New locking/refco... |
1739 |
current->fs->in_exec = 0; |
f9ce1f1cd Add in_execve fla... |
1740 |
current->in_execve = 0; |
d7822b1e2 rseq: Introduce r... |
1741 |
rseq_execve(current); |
a6f76f23d CRED: Make execve... |
1742 |
acct_update_integrals(current); |
16d51a590 sched/fair: Don't... |
1743 |
task_numa_free(current, false); |
a6f76f23d CRED: Make execve... |
1744 |
free_bprm(bprm); |
51f39a1f0 syscalls: impleme... |
1745 |
kfree(pathbuf); |
449325b52 umh: introduce fo... |
1746 1747 |
if (filename) putname(filename); |
a6f76f23d CRED: Make execve... |
1748 1749 1750 |
if (displaced) put_files_struct(displaced); return retval; |
1da177e4c Linux-2.6.12-rc2 |
1751 |
|
a6f76f23d CRED: Make execve... |
1752 |
out: |
3c77f8457 exec: make argv/e... |
1753 1754 1755 1756 |
if (bprm->mm) { acct_arg_size(bprm, 0); mmput(bprm->mm); } |
1da177e4c Linux-2.6.12-rc2 |
1757 |
|
498052bba New locking/refco... |
1758 |
out_unmark: |
9e00cdb09 exec:check_unsafe... |
1759 |
current->fs->in_exec = 0; |
f9ce1f1cd Add in_execve fla... |
1760 |
current->in_execve = 0; |
a6f76f23d CRED: Make execve... |
1761 1762 |
out_free: |
08a6fac1c [PATCH] get rid o... |
1763 |
free_bprm(bprm); |
51f39a1f0 syscalls: impleme... |
1764 |
kfree(pathbuf); |
1da177e4c Linux-2.6.12-rc2 |
1765 |
|
fd8328be8 [PATCH] sanitize ... |
1766 |
out_files: |
3b1253880 [PATCH] sanitize ... |
1767 1768 |
if (displaced) reset_files_struct(displaced); |
1da177e4c Linux-2.6.12-rc2 |
1769 |
out_ret: |
449325b52 umh: introduce fo... |
1770 1771 |
if (filename) putname(filename); |
1da177e4c Linux-2.6.12-rc2 |
1772 1773 |
return retval; } |
449325b52 umh: introduce fo... |
1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 |
static int do_execveat_common(int fd, struct filename *filename, struct user_arg_ptr argv, struct user_arg_ptr envp, int flags) { return __do_execve_file(fd, filename, argv, envp, flags, NULL); } int do_execve_file(struct file *file, void *__argv, void *__envp) { struct user_arg_ptr argv = { .ptr.native = __argv }; struct user_arg_ptr envp = { .ptr.native = __envp }; return __do_execve_file(AT_FDCWD, NULL, argv, envp, 0, file); } |
c4ad8f98b execve: use 'stru... |
1789 |
int do_execve(struct filename *filename, |
ba2d01629 exec: introduce s... |
1790 |
const char __user *const __user *__argv, |
da3d4c5fa get rid of pt_reg... |
1791 |
const char __user *const __user *__envp) |
ba2d01629 exec: introduce s... |
1792 |
{ |
0e028465d exec: unify do_ex... |
1793 1794 |
struct user_arg_ptr argv = { .ptr.native = __argv }; struct user_arg_ptr envp = { .ptr.native = __envp }; |
51f39a1f0 syscalls: impleme... |
1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 |
return do_execveat_common(AT_FDCWD, filename, argv, envp, 0); } int do_execveat(int fd, struct filename *filename, const char __user *const __user *__argv, const char __user *const __user *__envp, int flags) { struct user_arg_ptr argv = { .ptr.native = __argv }; struct user_arg_ptr envp = { .ptr.native = __envp }; return do_execveat_common(fd, filename, argv, envp, flags); |
0e028465d exec: unify do_ex... |
1807 1808 1809 |
} #ifdef CONFIG_COMPAT |
c4ad8f98b execve: use 'stru... |
1810 |
static int compat_do_execve(struct filename *filename, |
38b983b34 generic sys_execve() |
1811 |
const compat_uptr_t __user *__argv, |
d03d26e58 make compat_do_ex... |
1812 |
const compat_uptr_t __user *__envp) |
0e028465d exec: unify do_ex... |
1813 1814 1815 1816 1817 1818 1819 1820 1821 |
{ struct user_arg_ptr argv = { .is_compat = true, .ptr.compat = __argv, }; struct user_arg_ptr envp = { .is_compat = true, .ptr.compat = __envp, }; |
51f39a1f0 syscalls: impleme... |
1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 |
return do_execveat_common(AT_FDCWD, filename, argv, envp, 0); } static int compat_do_execveat(int fd, struct filename *filename, const compat_uptr_t __user *__argv, const compat_uptr_t __user *__envp, int flags) { struct user_arg_ptr argv = { .is_compat = true, .ptr.compat = __argv, }; struct user_arg_ptr envp = { .is_compat = true, .ptr.compat = __envp, }; return do_execveat_common(fd, filename, argv, envp, flags); |
ba2d01629 exec: introduce s... |
1839 |
} |
0e028465d exec: unify do_ex... |
1840 |
#endif |
ba2d01629 exec: introduce s... |
1841 |
|
964ee7df9 exec: fix set_bin... |
1842 |
void set_binfmt(struct linux_binfmt *new) |
1da177e4c Linux-2.6.12-rc2 |
1843 |
{ |
801460d0c task_struct clean... |
1844 1845 1846 1847 |
struct mm_struct *mm = current->mm; if (mm->binfmt) module_put(mm->binfmt->module); |
1da177e4c Linux-2.6.12-rc2 |
1848 |
|
801460d0c task_struct clean... |
1849 |
mm->binfmt = new; |
964ee7df9 exec: fix set_bin... |
1850 1851 |
if (new) __module_get(new->module); |
1da177e4c Linux-2.6.12-rc2 |
1852 |
} |
1da177e4c Linux-2.6.12-rc2 |
1853 |
EXPORT_SYMBOL(set_binfmt); |
6c5d52382 coredump masking:... |
1854 |
/* |
7288e1187 coredump: kill MM... |
1855 |
* set_dumpable stores three-value SUID_DUMP_* into mm->flags. |
6c5d52382 coredump masking:... |
1856 1857 1858 |
*/ void set_dumpable(struct mm_struct *mm, int value) { |
7288e1187 coredump: kill MM... |
1859 1860 |
if (WARN_ON((unsigned)value > SUID_DUMP_ROOT)) return; |
26e152252 fs/exec.c: replac... |
1861 |
set_mask_bits(&mm->flags, MMF_DUMPABLE_MASK, value); |
6c5d52382 coredump masking:... |
1862 |
} |
6c5d52382 coredump masking:... |
1863 |
|
38b983b34 generic sys_execve() |
1864 1865 1866 1867 1868 |
SYSCALL_DEFINE3(execve, const char __user *, filename, const char __user *const __user *, argv, const char __user *const __user *, envp) { |
c4ad8f98b execve: use 'stru... |
1869 |
return do_execve(getname(filename), argv, envp); |
38b983b34 generic sys_execve() |
1870 |
} |
51f39a1f0 syscalls: impleme... |
1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 |
SYSCALL_DEFINE5(execveat, int, fd, const char __user *, filename, const char __user *const __user *, argv, const char __user *const __user *, envp, int, flags) { int lookup_flags = (flags & AT_EMPTY_PATH) ? LOOKUP_EMPTY : 0; return do_execveat(fd, getname_flags(filename, lookup_flags, NULL), argv, envp, flags); } |
38b983b34 generic sys_execve() |
1884 |
#ifdef CONFIG_COMPAT |
625b1d7e8 fs/compat: conver... |
1885 1886 1887 |
COMPAT_SYSCALL_DEFINE3(execve, const char __user *, filename, const compat_uptr_t __user *, argv, const compat_uptr_t __user *, envp) |
38b983b34 generic sys_execve() |
1888 |
{ |
c4ad8f98b execve: use 'stru... |
1889 |
return compat_do_execve(getname(filename), argv, envp); |
38b983b34 generic sys_execve() |
1890 |
} |
51f39a1f0 syscalls: impleme... |
1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 |
COMPAT_SYSCALL_DEFINE5(execveat, int, fd, const char __user *, filename, const compat_uptr_t __user *, argv, const compat_uptr_t __user *, envp, int, flags) { int lookup_flags = (flags & AT_EMPTY_PATH) ? LOOKUP_EMPTY : 0; return compat_do_execveat(fd, getname_flags(filename, lookup_flags, NULL), argv, envp, flags); } |
38b983b34 generic sys_execve() |
1904 |
#endif |