Blame view
kernel/seccomp.c
54.2 KB
b24413180 License cleanup: ... |
1 |
// SPDX-License-Identifier: GPL-2.0 |
1da177e4c Linux-2.6.12-rc2 |
2 3 4 5 6 |
/* * linux/kernel/seccomp.c * * Copyright 2004-2005 Andrea Arcangeli <andrea@cpushare.com> * |
e2cfabdfd seccomp: add syst... |
7 8 9 10 11 12 13 14 |
* Copyright (C) 2012 Google, Inc. * Will Drewry <wad@chromium.org> * * This defines a simple but solid secure-computing facility. * * Mode 1 uses a fixed list of allowed system calls. * Mode 2 allows user-defined system call filters in the form * of Berkeley Packet Filters/Linux Socket Filters. |
1da177e4c Linux-2.6.12-rc2 |
15 |
*/ |
e68f9d49d seccomp: Use pr_fmt |
16 |
#define pr_fmt(fmt) "seccomp: " fmt |
1da177e4c Linux-2.6.12-rc2 |
17 |
|
0b5fa2290 seccomp: Switch f... |
18 |
#include <linux/refcount.h> |
85e7bac33 seccomp: audit ab... |
19 |
#include <linux/audit.h> |
5b1017404 x86-64: seccomp: ... |
20 |
#include <linux/compat.h> |
b25e67161 seccomp: dump cor... |
21 |
#include <linux/coredump.h> |
8e5f1ad11 seccomp: Sysctl t... |
22 |
#include <linux/kmemleak.h> |
5c3070890 seccomp: Enable s... |
23 24 |
#include <linux/nospec.h> #include <linux/prctl.h> |
e2cfabdfd seccomp: add syst... |
25 |
#include <linux/sched.h> |
68db0cf10 sched/headers: Pr... |
26 |
#include <linux/sched/task_stack.h> |
e2cfabdfd seccomp: add syst... |
27 |
#include <linux/seccomp.h> |
c8bee430d seccomp: split fi... |
28 |
#include <linux/slab.h> |
48dc92b9f seccomp: add "sec... |
29 |
#include <linux/syscalls.h> |
8e5f1ad11 seccomp: Sysctl t... |
30 |
#include <linux/sysctl.h> |
1da177e4c Linux-2.6.12-rc2 |
31 |
|
a4412fc94 seccomp,x86,arm,m... |
32 |
#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER |
e2cfabdfd seccomp: add syst... |
33 |
#include <asm/syscall.h> |
a4412fc94 seccomp,x86,arm,m... |
34 |
#endif |
e2cfabdfd seccomp: add syst... |
35 36 |
#ifdef CONFIG_SECCOMP_FILTER |
6a21cc50f seccomp: add a re... |
37 |
#include <linux/file.h> |
e2cfabdfd seccomp: add syst... |
38 |
#include <linux/filter.h> |
c2e1f2e30 seccomp: implemen... |
39 |
#include <linux/pid.h> |
fb0fadf9b ptrace,seccomp: A... |
40 |
#include <linux/ptrace.h> |
fb14528e4 seccomp: Set PF_S... |
41 |
#include <linux/capability.h> |
e2cfabdfd seccomp: add syst... |
42 43 |
#include <linux/tracehook.h> #include <linux/uaccess.h> |
6a21cc50f seccomp: add a re... |
44 |
#include <linux/anon_inodes.h> |
9f87dcf14 seccomp: Add find... |
45 |
#include <linux/lockdep.h> |
6a21cc50f seccomp: add a re... |
46 |
|
47e33c05f seccomp: Fix ioct... |
47 48 49 50 51 52 53 |
/* * When SECCOMP_IOCTL_NOTIF_ID_VALID was first introduced, it had the * wrong direction flag in the ioctl number. This is the broken one, * which the kernel needs to keep supporting until all userspaces stop * using the wrong command number. */ #define SECCOMP_IOCTL_NOTIF_ID_VALID_WRONG_DIR SECCOMP_IOR(2, __u64) |
6a21cc50f seccomp: add a re... |
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 |
enum notify_state { SECCOMP_NOTIFY_INIT, SECCOMP_NOTIFY_SENT, SECCOMP_NOTIFY_REPLIED, }; struct seccomp_knotif { /* The struct pid of the task whose filter triggered the notification */ struct task_struct *task; /* The "cookie" for this request; this is unique for this filter. */ u64 id; /* * The seccomp data. This pointer is valid the entire time this * notification is active, since it comes from __seccomp_filter which * eclipses the entire lifecycle here. */ const struct seccomp_data *data; /* * Notification states. When SECCOMP_RET_USER_NOTIF is returned, a * struct seccomp_knotif is created and starts out in INIT. Once the * handler reads the notification off of an FD, it transitions to SENT. * If a signal is received the state transitions back to INIT and * another message is sent. When the userspace handler replies, state * transitions to REPLIED. */ enum notify_state state; /* The return values, only valid when in SECCOMP_NOTIFY_REPLIED */ int error; long val; |
fb3c5386b seccomp: add SECC... |
87 |
u32 flags; |
6a21cc50f seccomp: add a re... |
88 |
|
7cf97b125 seccomp: Introduc... |
89 90 91 92 |
/* * Signals when this has changed states, such as the listener * dying, a new seccomp addfd message, or changing to REPLIED */ |
6a21cc50f seccomp: add a re... |
93 94 95 |
struct completion ready; struct list_head list; |
7cf97b125 seccomp: Introduc... |
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 |
/* outstanding addfd requests */ struct list_head addfd; }; /** * struct seccomp_kaddfd - container for seccomp_addfd ioctl messages * * @file: A reference to the file to install in the other task * @fd: The fd number to install it at. If the fd number is -1, it means the * installing process should allocate the fd as normal. * @flags: The flags for the new file descriptor. At the moment, only O_CLOEXEC * is allowed. * @ret: The return value of the installing process. It is set to the fd num * upon success (>= 0). * @completion: Indicates that the installing process has completed fd * installation, or gone away (either due to successful * reply, or signal) * */ struct seccomp_kaddfd { struct file *file; int fd; unsigned int flags; /* To only be set on reply */ int ret; struct completion completion; struct list_head list; |
6a21cc50f seccomp: add a re... |
125 126 127 128 129 130 131 132 133 134 135 136 137 |
}; /** * struct notification - container for seccomp userspace notifications. Since * most seccomp filters will not have notification listeners attached and this * structure is fairly large, we store the notification-specific stuff in a * separate structure. * * @request: A semaphore that users of this notification can wait on for * changes. Actual reads and writes are still controlled with * filter->notify_lock. * @next_id: The id of the next request. * @notifications: A list of struct seccomp_knotif elements. |
6a21cc50f seccomp: add a re... |
138 139 140 141 142 |
*/ struct notification { struct semaphore request; u64 next_id; struct list_head notifications; |
6a21cc50f seccomp: add a re... |
143 |
}; |
e2cfabdfd seccomp: add syst... |
144 145 146 147 |
/** * struct seccomp_filter - container for seccomp BPF programs * |
b707ddee1 seccomp: rename "... |
148 149 150 151 152 |
* @refs: Reference count to manage the object lifetime. * A filter's reference count is incremented for each directly * attached task, once for the dependent filter, and if * requested for the user notifier. When @refs reaches zero, * the filter can be freed. |
99cdb8b9a seccomp: notify a... |
153 154 155 156 157 158 159 160 |
* @users: A filter's @users count is incremented for each directly * attached task (filter installation, fork(), thread_sync), * and once for the dependent filter (tracked in filter->prev). * When it reaches zero it indicates that no direct or indirect * users of that filter exist. No new tasks can get associated with * this filter after reaching 0. The @users count is always smaller * or equal to @refs. Hence, reaching 0 for @users does not mean * the filter can be freed. |
e66a39977 seccomp: Filter f... |
161 |
* @log: true if all actions except for SECCOMP_RET_ALLOW should be logged |
e2cfabdfd seccomp: add syst... |
162 |
* @prev: points to a previously installed, or inherited, filter |
285fdfc5d seccomp: Fix docu... |
163 |
* @prog: the BPF program to evaluate |
6a21cc50f seccomp: add a re... |
164 165 |
* @notif: the struct that holds all notification related information * @notify_lock: A lock for all notification-related accesses. |
76194c4e8 seccomp: Lift wai... |
166 |
* @wqh: A wait queue for poll if a notifier is in use. |
e2cfabdfd seccomp: add syst... |
167 168 169 170 171 172 173 174 175 |
* * seccomp_filter objects are organized in a tree linked via the @prev * pointer. For any task, it appears to be a singly-linked list starting * with current->seccomp.filter, the most recently attached or inherited filter. * However, multiple filters may share a @prev node, by way of fork(), which * results in a unidirectional tree existing in memory. This is similar to * how namespaces work. * * seccomp_filter objects should never be modified after being attached |
b707ddee1 seccomp: rename "... |
176 |
* to a task_struct (other than @refs). |
e2cfabdfd seccomp: add syst... |
177 178 |
*/ struct seccomp_filter { |
b707ddee1 seccomp: rename "... |
179 |
refcount_t refs; |
99cdb8b9a seccomp: notify a... |
180 |
refcount_t users; |
e66a39977 seccomp: Filter f... |
181 |
bool log; |
e2cfabdfd seccomp: add syst... |
182 |
struct seccomp_filter *prev; |
7ae457c1e net: filter: spli... |
183 |
struct bpf_prog *prog; |
6a21cc50f seccomp: add a re... |
184 185 |
struct notification *notif; struct mutex notify_lock; |
76194c4e8 seccomp: Lift wai... |
186 |
wait_queue_head_t wqh; |
e2cfabdfd seccomp: add syst... |
187 188 189 190 |
}; /* Limit any path through the tree to 256KB worth of instructions. */ #define MAX_INSNS_PER_PATH ((1 << 18) / sizeof(struct sock_filter)) |
bd4cf0ed3 net: filter: rewo... |
191 |
/* |
e2cfabdfd seccomp: add syst... |
192 193 194 |
* Endianness is explicitly ignored and left for BPF program authors to manage * as per the specific architecture. */ |
bd4cf0ed3 net: filter: rewo... |
195 |
static void populate_seccomp_data(struct seccomp_data *sd) |
e2cfabdfd seccomp: add syst... |
196 |
{ |
2d9ca267a seccomp: Use curr... |
197 198 199 200 |
/* * Instead of using current_pt_reg(), we're already doing the work * to safely fetch "current", so just use "task" everywhere below. */ |
bd4cf0ed3 net: filter: rewo... |
201 202 |
struct task_struct *task = current; struct pt_regs *regs = task_pt_regs(task); |
2eac76483 seccomp: fix popu... |
203 |
unsigned long args[6]; |
e2cfabdfd seccomp: add syst... |
204 |
|
bd4cf0ed3 net: filter: rewo... |
205 |
sd->nr = syscall_get_nr(task, regs); |
16add4116 syscall_get_arch:... |
206 |
sd->arch = syscall_get_arch(task); |
b35f549df syscalls: Remove ... |
207 |
syscall_get_arguments(task, regs, args); |
2eac76483 seccomp: fix popu... |
208 209 210 211 212 213 |
sd->args[0] = args[0]; sd->args[1] = args[1]; sd->args[2] = args[2]; sd->args[3] = args[3]; sd->args[4] = args[4]; sd->args[5] = args[5]; |
bd4cf0ed3 net: filter: rewo... |
214 |
sd->instruction_pointer = KSTK_EIP(task); |
e2cfabdfd seccomp: add syst... |
215 216 217 218 219 220 221 |
} /** * seccomp_check_filter - verify seccomp filter code * @filter: filter to verify * @flen: length of filter * |
4df95ff48 net: filter: rena... |
222 |
* Takes a previously checked filter (by bpf_check_classic) and |
e2cfabdfd seccomp: add syst... |
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 |
* redirects all filter code that loads struct sk_buff data * and related data through seccomp_bpf_load. It also * enforces length and alignment checking of those loads. * * Returns 0 if the rule set is legal or -EINVAL if not. */ static int seccomp_check_filter(struct sock_filter *filter, unsigned int flen) { int pc; for (pc = 0; pc < flen; pc++) { struct sock_filter *ftest = &filter[pc]; u16 code = ftest->code; u32 k = ftest->k; switch (code) { |
348059313 net: filter: get ... |
238 |
case BPF_LD | BPF_W | BPF_ABS: |
bd4cf0ed3 net: filter: rewo... |
239 |
ftest->code = BPF_LDX | BPF_W | BPF_ABS; |
e2cfabdfd seccomp: add syst... |
240 241 242 243 |
/* 32-bit aligned and not out of bounds. */ if (k >= sizeof(struct seccomp_data) || k & 3) return -EINVAL; continue; |
348059313 net: filter: get ... |
244 |
case BPF_LD | BPF_W | BPF_LEN: |
bd4cf0ed3 net: filter: rewo... |
245 |
ftest->code = BPF_LD | BPF_IMM; |
e2cfabdfd seccomp: add syst... |
246 247 |
ftest->k = sizeof(struct seccomp_data); continue; |
348059313 net: filter: get ... |
248 |
case BPF_LDX | BPF_W | BPF_LEN: |
bd4cf0ed3 net: filter: rewo... |
249 |
ftest->code = BPF_LDX | BPF_IMM; |
e2cfabdfd seccomp: add syst... |
250 251 252 |
ftest->k = sizeof(struct seccomp_data); continue; /* Explicitly include allowed calls. */ |
348059313 net: filter: get ... |
253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 |
case BPF_RET | BPF_K: case BPF_RET | BPF_A: case BPF_ALU | BPF_ADD | BPF_K: case BPF_ALU | BPF_ADD | BPF_X: case BPF_ALU | BPF_SUB | BPF_K: case BPF_ALU | BPF_SUB | BPF_X: case BPF_ALU | BPF_MUL | BPF_K: case BPF_ALU | BPF_MUL | BPF_X: case BPF_ALU | BPF_DIV | BPF_K: case BPF_ALU | BPF_DIV | BPF_X: case BPF_ALU | BPF_AND | BPF_K: case BPF_ALU | BPF_AND | BPF_X: case BPF_ALU | BPF_OR | BPF_K: case BPF_ALU | BPF_OR | BPF_X: case BPF_ALU | BPF_XOR | BPF_K: case BPF_ALU | BPF_XOR | BPF_X: case BPF_ALU | BPF_LSH | BPF_K: case BPF_ALU | BPF_LSH | BPF_X: case BPF_ALU | BPF_RSH | BPF_K: case BPF_ALU | BPF_RSH | BPF_X: case BPF_ALU | BPF_NEG: case BPF_LD | BPF_IMM: case BPF_LDX | BPF_IMM: case BPF_MISC | BPF_TAX: case BPF_MISC | BPF_TXA: case BPF_LD | BPF_MEM: case BPF_LDX | BPF_MEM: case BPF_ST: case BPF_STX: case BPF_JMP | BPF_JA: case BPF_JMP | BPF_JEQ | BPF_K: case BPF_JMP | BPF_JEQ | BPF_X: case BPF_JMP | BPF_JGE | BPF_K: case BPF_JMP | BPF_JGE | BPF_X: case BPF_JMP | BPF_JGT | BPF_K: case BPF_JMP | BPF_JGT | BPF_X: case BPF_JMP | BPF_JSET | BPF_K: case BPF_JMP | BPF_JSET | BPF_X: |
e2cfabdfd seccomp: add syst... |
291 292 293 294 295 296 297 298 299 |
continue; default: return -EINVAL; } } return 0; } /** |
285fdfc5d seccomp: Fix docu... |
300 301 |
* seccomp_run_filters - evaluates all seccomp filters against @sd * @sd: optional seccomp data to be passed to filters |
deb4de8b3 seccomp: Provide ... |
302 303 304 |
* @match: stores struct seccomp_filter that resulted in the return value, * unless filter returned SECCOMP_RET_ALLOW, in which case it will * be unchanged. |
e2cfabdfd seccomp: add syst... |
305 306 307 |
* * Returns valid seccomp BPF response codes. */ |
0466bdb99 seccomp: Implemen... |
308 |
#define ACTION_ONLY(ret) ((s32)((ret) & (SECCOMP_RET_ACTION_FULL))) |
deb4de8b3 seccomp: Provide ... |
309 310 |
static u32 seccomp_run_filters(const struct seccomp_data *sd, struct seccomp_filter **match) |
e2cfabdfd seccomp: add syst... |
311 |
{ |
acf3b2c71 seccomp: add SECC... |
312 |
u32 ret = SECCOMP_RET_ALLOW; |
8225d3853 seccomp: Replace ... |
313 314 |
/* Make sure cross-thread synced filter points somewhere sane. */ struct seccomp_filter *f = |
506458efa locking/barriers:... |
315 |
READ_ONCE(current->seccomp.filter); |
acf3b2c71 seccomp: add SECC... |
316 317 |
/* Ensure unexpected behavior doesn't result in failing open. */ |
0d42d73a3 seccomp: remove u... |
318 |
if (WARN_ON(f == NULL)) |
4d3b0b05a seccomp: Introduc... |
319 |
return SECCOMP_RET_KILL_PROCESS; |
acf3b2c71 seccomp: add SECC... |
320 |
|
e2cfabdfd seccomp: add syst... |
321 322 |
/* * All filters in the list are evaluated and the lowest BPF return |
acf3b2c71 seccomp: add SECC... |
323 |
* value always takes priority (ignoring the DATA). |
e2cfabdfd seccomp: add syst... |
324 |
*/ |
3ba2530cc seccomp: allow mo... |
325 |
for (; f; f = f->prev) { |
3d9f773cf bpf: Use bpf_prog... |
326 |
u32 cur_ret = bpf_prog_run_pin_on_cpu(f->prog, sd); |
8f577cadf seccomp: JIT comp... |
327 |
|
0466bdb99 seccomp: Implemen... |
328 |
if (ACTION_ONLY(cur_ret) < ACTION_ONLY(ret)) { |
acf3b2c71 seccomp: add SECC... |
329 |
ret = cur_ret; |
deb4de8b3 seccomp: Provide ... |
330 331 |
*match = f; } |
e2cfabdfd seccomp: add syst... |
332 333 334 |
} return ret; } |
1f41b4504 seccomp: extract ... |
335 |
#endif /* CONFIG_SECCOMP_FILTER */ |
e2cfabdfd seccomp: add syst... |
336 |
|
1f41b4504 seccomp: extract ... |
337 338 |
static inline bool seccomp_may_assign_mode(unsigned long seccomp_mode) { |
69f6a34bd seccomp: Replace ... |
339 |
assert_spin_locked(¤t->sighand->siglock); |
dbd952127 seccomp: introduc... |
340 |
|
1f41b4504 seccomp: extract ... |
341 342 343 344 345 |
if (current->seccomp.mode && current->seccomp.mode != seccomp_mode) return false; return true; } |
8bf37d8c0 seccomp: Move spe... |
346 |
void __weak arch_seccomp_spec_mitigate(struct task_struct *task) { } |
5c3070890 seccomp: Enable s... |
347 |
|
3ba2530cc seccomp: allow mo... |
348 |
static inline void seccomp_assign_mode(struct task_struct *task, |
00a02d0c5 seccomp: Add filt... |
349 350 |
unsigned long seccomp_mode, unsigned long flags) |
1f41b4504 seccomp: extract ... |
351 |
{ |
69f6a34bd seccomp: Replace ... |
352 |
assert_spin_locked(&task->sighand->siglock); |
dbd952127 seccomp: introduc... |
353 |
|
3ba2530cc seccomp: allow mo... |
354 355 356 357 358 359 |
task->seccomp.mode = seccomp_mode; /* * Make sure TIF_SECCOMP cannot be set before the mode (and * filter) is set. */ smp_mb__before_atomic(); |
00a02d0c5 seccomp: Add filt... |
360 361 |
/* Assume default seccomp processes want spec flaw mitigation. */ if ((flags & SECCOMP_FILTER_FLAG_SPEC_ALLOW) == 0) |
8bf37d8c0 seccomp: Move spe... |
362 |
arch_seccomp_spec_mitigate(task); |
3ba2530cc seccomp: allow mo... |
363 |
set_tsk_thread_flag(task, TIF_SECCOMP); |
1f41b4504 seccomp: extract ... |
364 365 366 |
} #ifdef CONFIG_SECCOMP_FILTER |
c2e1f2e30 seccomp: implemen... |
367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 |
/* Returns 1 if the parent is an ancestor of the child. */ static int is_ancestor(struct seccomp_filter *parent, struct seccomp_filter *child) { /* NULL is the root ancestor. */ if (parent == NULL) return 1; for (; child; child = child->prev) if (child == parent) return 1; return 0; } /** * seccomp_can_sync_threads: checks if all threads can be synchronized * * Expects sighand and cred_guard_mutex locks to be held. * * Returns 0 on success, -ve on error, or the pid of a thread which was |
6beff00b7 seccomp: fix up g... |
386 |
* either not in the correct seccomp mode or did not have an ancestral |
c2e1f2e30 seccomp: implemen... |
387 388 389 390 391 392 393 |
* seccomp filter. */ static inline pid_t seccomp_can_sync_threads(void) { struct task_struct *thread, *caller; BUG_ON(!mutex_is_locked(¤t->signal->cred_guard_mutex)); |
69f6a34bd seccomp: Replace ... |
394 |
assert_spin_locked(¤t->sighand->siglock); |
c2e1f2e30 seccomp: implemen... |
395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 |
/* Validate all threads being eligible for synchronization. */ caller = current; for_each_thread(caller, thread) { pid_t failed; /* Skip current, since it is initiating the sync. */ if (thread == caller) continue; if (thread->seccomp.mode == SECCOMP_MODE_DISABLED || (thread->seccomp.mode == SECCOMP_MODE_FILTER && is_ancestor(thread->seccomp.filter, caller->seccomp.filter))) continue; /* Return the first thread that cannot be synchronized. */ failed = task_pid_vnr(thread); /* If the pid cannot be resolved, then return -ESRCH */ |
0d42d73a3 seccomp: remove u... |
414 |
if (WARN_ON(failed == 0)) |
c2e1f2e30 seccomp: implemen... |
415 416 417 418 419 420 |
failed = -ESRCH; return failed; } return 0; } |
3a15fb6ed seccomp: release ... |
421 422 423 424 425 426 427 |
static inline void seccomp_filter_free(struct seccomp_filter *filter) { if (filter) { bpf_prog_destroy(filter->prog); kfree(filter); } } |
99cdb8b9a seccomp: notify a... |
428 429 430 431 432 433 434 435 |
static void __seccomp_filter_orphan(struct seccomp_filter *orig) { while (orig && refcount_dec_and_test(&orig->users)) { if (waitqueue_active(&orig->wqh)) wake_up_poll(&orig->wqh, EPOLLHUP); orig = orig->prev; } } |
3a15fb6ed seccomp: release ... |
436 437 438 439 440 441 442 443 444 |
static void __put_seccomp_filter(struct seccomp_filter *orig) { /* Clean up single-reference branches iteratively. */ while (orig && refcount_dec_and_test(&orig->refs)) { struct seccomp_filter *freeme = orig; orig = orig->prev; seccomp_filter_free(freeme); } } |
99cdb8b9a seccomp: notify a... |
445 446 447 448 449 450 451 |
static void __seccomp_filter_release(struct seccomp_filter *orig) { /* Notify about any unused filters in the task's former filter tree. */ __seccomp_filter_orphan(orig); /* Finally drop all references to the task's former tree. */ __put_seccomp_filter(orig); } |
3a15fb6ed seccomp: release ... |
452 |
/** |
99cdb8b9a seccomp: notify a... |
453 454 455 |
* seccomp_filter_release - Detach the task from its filter tree, * drop its reference count, and notify * about unused filters |
3a15fb6ed seccomp: release ... |
456 457 458 459 460 461 462 463 464 465 466 |
* * This function should only be called when the task is exiting as * it detaches it from its filter tree. As such, READ_ONCE() and * barriers are not needed here, as would normally be needed. */ void seccomp_filter_release(struct task_struct *tsk) { struct seccomp_filter *orig = tsk->seccomp.filter; /* Detach task from its filter tree. */ tsk->seccomp.filter = NULL; |
99cdb8b9a seccomp: notify a... |
467 |
__seccomp_filter_release(orig); |
3a15fb6ed seccomp: release ... |
468 |
} |
c2e1f2e30 seccomp: implemen... |
469 470 471 472 473 474 475 476 |
/** * seccomp_sync_threads: sets all threads to use current's filter * * Expects sighand and cred_guard_mutex locks to be held, and for * seccomp_can_sync_threads() to have returned success already * without dropping the locks. * */ |
00a02d0c5 seccomp: Add filt... |
477 |
static inline void seccomp_sync_threads(unsigned long flags) |
c2e1f2e30 seccomp: implemen... |
478 479 480 481 |
{ struct task_struct *thread, *caller; BUG_ON(!mutex_is_locked(¤t->signal->cred_guard_mutex)); |
69f6a34bd seccomp: Replace ... |
482 |
assert_spin_locked(¤t->sighand->siglock); |
c2e1f2e30 seccomp: implemen... |
483 484 485 486 487 488 489 490 491 492 |
/* Synchronize all threads. */ caller = current; for_each_thread(caller, thread) { /* Skip current, since it needs no changes. */ if (thread == caller) continue; /* Get a task reference for the new leaf node. */ get_seccomp_filter(caller); |
99cdb8b9a seccomp: notify a... |
493 |
|
c2e1f2e30 seccomp: implemen... |
494 495 496 497 498 |
/* * Drop the task reference to the shared ancestor since * current's path will hold a reference. (This also * allows a put before the assignment.) */ |
99cdb8b9a seccomp: notify a... |
499 500 501 |
__seccomp_filter_release(thread->seccomp.filter); /* Make our new filter tree visible. */ |
c2e1f2e30 seccomp: implemen... |
502 503 |
smp_store_release(&thread->seccomp.filter, caller->seccomp.filter); |
c818c03b6 seccomp: Report n... |
504 505 |
atomic_set(&thread->seccomp.filter_count, atomic_read(&thread->seccomp.filter_count)); |
103502a35 seccomp: always p... |
506 507 508 509 510 511 512 513 514 |
/* * Don't let an unprivileged task work around * the no_new_privs restriction by creating * a thread that sets it up, enters seccomp, * then dies. */ if (task_no_new_privs(caller)) task_set_no_new_privs(thread); |
c2e1f2e30 seccomp: implemen... |
515 516 517 518 519 520 |
/* * Opt the other thread into seccomp if needed. * As threads are considered to be trust-realm * equivalent (see ptrace_may_access), it is safe to * allow one thread to transition the other. */ |
103502a35 seccomp: always p... |
521 |
if (thread->seccomp.mode == SECCOMP_MODE_DISABLED) |
00a02d0c5 seccomp: Add filt... |
522 523 |
seccomp_assign_mode(thread, SECCOMP_MODE_FILTER, flags); |
c2e1f2e30 seccomp: implemen... |
524 525 |
} } |
e2cfabdfd seccomp: add syst... |
526 |
/** |
c8bee430d seccomp: split fi... |
527 |
* seccomp_prepare_filter: Prepares a seccomp filter for use. |
e2cfabdfd seccomp: add syst... |
528 529 |
* @fprog: BPF program to install * |
c8bee430d seccomp: split fi... |
530 |
* Returns filter on success or an ERR_PTR on failure. |
e2cfabdfd seccomp: add syst... |
531 |
*/ |
c8bee430d seccomp: split fi... |
532 |
static struct seccomp_filter *seccomp_prepare_filter(struct sock_fprog *fprog) |
e2cfabdfd seccomp: add syst... |
533 |
{ |
ac67eb2c5 seccomp, filter: ... |
534 535 |
struct seccomp_filter *sfilter; int ret; |
97f2645f3 tree-wide: replac... |
536 |
const bool save_orig = IS_ENABLED(CONFIG_CHECKPOINT_RESTORE); |
e2cfabdfd seccomp: add syst... |
537 538 |
if (fprog->len == 0 || fprog->len > BPF_MAXINSNS) |
c8bee430d seccomp: split fi... |
539 |
return ERR_PTR(-EINVAL); |
d9e12f42e seccomp: simplify... |
540 |
|
c8bee430d seccomp: split fi... |
541 |
BUG_ON(INT_MAX / fprog->len < sizeof(struct sock_filter)); |
e2cfabdfd seccomp: add syst... |
542 543 |
/* |
119ce5c8b kernel/seccomp.c:... |
544 |
* Installing a seccomp filter requires that the task has |
e2cfabdfd seccomp: add syst... |
545 546 547 548 |
* CAP_SYS_ADMIN in its namespace or be running with no_new_privs. * This avoids scenarios where unprivileged tasks can affect the * behavior of privileged children. */ |
1d4457f99 sched: move no_ne... |
549 |
if (!task_no_new_privs(current) && |
fb14528e4 seccomp: Set PF_S... |
550 |
!ns_capable_noaudit(current_user_ns(), CAP_SYS_ADMIN)) |
c8bee430d seccomp: split fi... |
551 |
return ERR_PTR(-EACCES); |
e2cfabdfd seccomp: add syst... |
552 |
|
bd4cf0ed3 net: filter: rewo... |
553 |
/* Allocate a new seccomp_filter */ |
ac67eb2c5 seccomp, filter: ... |
554 555 |
sfilter = kzalloc(sizeof(*sfilter), GFP_KERNEL | __GFP_NOWARN); if (!sfilter) |
d9e12f42e seccomp: simplify... |
556 |
return ERR_PTR(-ENOMEM); |
ac67eb2c5 seccomp, filter: ... |
557 |
|
6a21cc50f seccomp: add a re... |
558 |
mutex_init(&sfilter->notify_lock); |
ac67eb2c5 seccomp, filter: ... |
559 |
ret = bpf_prog_create_from_user(&sfilter->prog, fprog, |
f8e529ed9 seccomp, ptrace: ... |
560 |
seccomp_check_filter, save_orig); |
ac67eb2c5 seccomp, filter: ... |
561 562 563 |
if (ret < 0) { kfree(sfilter); return ERR_PTR(ret); |
d9e12f42e seccomp: simplify... |
564 |
} |
bd4cf0ed3 net: filter: rewo... |
565 |
|
b707ddee1 seccomp: rename "... |
566 |
refcount_set(&sfilter->refs, 1); |
99cdb8b9a seccomp: notify a... |
567 |
refcount_set(&sfilter->users, 1); |
76194c4e8 seccomp: Lift wai... |
568 |
init_waitqueue_head(&sfilter->wqh); |
e2cfabdfd seccomp: add syst... |
569 |
|
ac67eb2c5 seccomp, filter: ... |
570 |
return sfilter; |
e2cfabdfd seccomp: add syst... |
571 572 573 |
} /** |
c8bee430d seccomp: split fi... |
574 |
* seccomp_prepare_user_filter - prepares a user-supplied sock_fprog |
e2cfabdfd seccomp: add syst... |
575 576 577 578 |
* @user_filter: pointer to the user data containing a sock_fprog. * * Returns 0 on success and non-zero otherwise. */ |
c8bee430d seccomp: split fi... |
579 580 |
static struct seccomp_filter * seccomp_prepare_user_filter(const char __user *user_filter) |
e2cfabdfd seccomp: add syst... |
581 582 |
{ struct sock_fprog fprog; |
c8bee430d seccomp: split fi... |
583 |
struct seccomp_filter *filter = ERR_PTR(-EFAULT); |
e2cfabdfd seccomp: add syst... |
584 585 |
#ifdef CONFIG_COMPAT |
5c38065e0 seccomp: check in... |
586 |
if (in_compat_syscall()) { |
e2cfabdfd seccomp: add syst... |
587 588 589 590 591 592 593 594 595 |
struct compat_sock_fprog fprog32; if (copy_from_user(&fprog32, user_filter, sizeof(fprog32))) goto out; fprog.len = fprog32.len; fprog.filter = compat_ptr(fprog32.filter); } else /* falls through to the if below. */ #endif if (copy_from_user(&fprog, user_filter, sizeof(fprog))) goto out; |
c8bee430d seccomp: split fi... |
596 |
filter = seccomp_prepare_filter(&fprog); |
e2cfabdfd seccomp: add syst... |
597 |
out: |
c8bee430d seccomp: split fi... |
598 599 600 601 602 603 604 605 |
return filter; } /** * seccomp_attach_filter: validate and attach filter * @flags: flags to change filter behavior * @filter: seccomp filter to add to the current process * |
dbd952127 seccomp: introduc... |
606 607 |
* Caller must be holding current->sighand->siglock lock. * |
7a0df7fbc seccomp: Make NEW... |
608 609 610 611 |
* Returns 0 on success, -ve on error, or * - in TSYNC mode: the pid of a thread which was either not in the correct * seccomp mode or did not have an ancestral seccomp filter * - in NEW_LISTENER mode: the fd of the new listener |
c8bee430d seccomp: split fi... |
612 613 614 615 616 617 |
*/ static long seccomp_attach_filter(unsigned int flags, struct seccomp_filter *filter) { unsigned long total_insns; struct seccomp_filter *walker; |
69f6a34bd seccomp: Replace ... |
618 |
assert_spin_locked(¤t->sighand->siglock); |
dbd952127 seccomp: introduc... |
619 |
|
c8bee430d seccomp: split fi... |
620 621 622 623 624 625 |
/* Validate resulting filter length. */ total_insns = filter->prog->len; for (walker = current->seccomp.filter; walker; walker = walker->prev) total_insns += walker->prog->len + 4; /* 4 instr penalty */ if (total_insns > MAX_INSNS_PER_PATH) return -ENOMEM; |
c2e1f2e30 seccomp: implemen... |
626 627 628 629 630 |
/* If thread sync has been requested, check that it is possible. */ if (flags & SECCOMP_FILTER_FLAG_TSYNC) { int ret; ret = seccomp_can_sync_threads(); |
51891498f seccomp: allow TS... |
631 632 633 634 635 636 |
if (ret) { if (flags & SECCOMP_FILTER_FLAG_TSYNC_ESRCH) return -ESRCH; else return ret; } |
c2e1f2e30 seccomp: implemen... |
637 |
} |
e66a39977 seccomp: Filter f... |
638 639 640 |
/* Set log flag, if present. */ if (flags & SECCOMP_FILTER_FLAG_LOG) filter->log = true; |
c8bee430d seccomp: split fi... |
641 642 643 644 645 646 |
/* * If there is an existing filter, make it the prev and don't drop its * task reference. */ filter->prev = current->seccomp.filter; current->seccomp.filter = filter; |
c818c03b6 seccomp: Report n... |
647 |
atomic_inc(¤t->seccomp.filter_count); |
c8bee430d seccomp: split fi... |
648 |
|
c2e1f2e30 seccomp: implemen... |
649 650 |
/* Now that the new filter is in place, synchronize to all threads. */ if (flags & SECCOMP_FILTER_FLAG_TSYNC) |
00a02d0c5 seccomp: Add filt... |
651 |
seccomp_sync_threads(flags); |
c2e1f2e30 seccomp: implemen... |
652 |
|
c8bee430d seccomp: split fi... |
653 |
return 0; |
e2cfabdfd seccomp: add syst... |
654 |
} |
084f5601c seccomp: make fun... |
655 |
static void __get_seccomp_filter(struct seccomp_filter *filter) |
66a733ea6 seccomp: fix the ... |
656 |
{ |
b707ddee1 seccomp: rename "... |
657 |
refcount_inc(&filter->refs); |
66a733ea6 seccomp: fix the ... |
658 |
} |
e2cfabdfd seccomp: add syst... |
659 660 661 662 663 664 |
/* get_seccomp_filter - increments the reference count of the filter on @tsk */ void get_seccomp_filter(struct task_struct *tsk) { struct seccomp_filter *orig = tsk->seccomp.filter; if (!orig) return; |
66a733ea6 seccomp: fix the ... |
665 |
__get_seccomp_filter(orig); |
99cdb8b9a seccomp: notify a... |
666 |
refcount_inc(&orig->users); |
e2cfabdfd seccomp: add syst... |
667 |
} |
ae7795bc6 signal: Distingui... |
668 |
static void seccomp_init_siginfo(kernel_siginfo_t *info, int syscall, int reason) |
b25e67161 seccomp: dump cor... |
669 |
{ |
3b10db2b0 signal: Replace m... |
670 |
clear_siginfo(info); |
b25e67161 seccomp: dump cor... |
671 672 673 674 |
info->si_signo = SIGSYS; info->si_code = SYS_SECCOMP; info->si_call_addr = (void __user *)KSTK_EIP(current); info->si_errno = reason; |
16add4116 syscall_get_arch:... |
675 |
info->si_arch = syscall_get_arch(current); |
b25e67161 seccomp: dump cor... |
676 677 |
info->si_syscall = syscall; } |
bb6ea4301 seccomp: Add SECC... |
678 679 680 681 682 683 684 685 686 |
/** * seccomp_send_sigsys - signals the task to allow in-process syscall emulation * @syscall: syscall number to send to userland * @reason: filter-supplied reason code to send to userland (via si_errno) * * Forces a SIGSYS with a code of SYS_SECCOMP and related sigsys info. */ static void seccomp_send_sigsys(int syscall, int reason) { |
ae7795bc6 signal: Distingui... |
687 |
struct kernel_siginfo info; |
b25e67161 seccomp: dump cor... |
688 |
seccomp_init_siginfo(&info, syscall, reason); |
a89e9b8ab signal: Remove th... |
689 |
force_sig_info(&info); |
bb6ea4301 seccomp: Add SECC... |
690 |
} |
e2cfabdfd seccomp: add syst... |
691 |
#endif /* CONFIG_SECCOMP_FILTER */ |
1da177e4c Linux-2.6.12-rc2 |
692 |
|
0ddec0fc8 seccomp: Sysctl t... |
693 |
/* For use with seccomp_actions_logged */ |
4d3b0b05a seccomp: Introduc... |
694 695 |
#define SECCOMP_LOG_KILL_PROCESS (1 << 0) #define SECCOMP_LOG_KILL_THREAD (1 << 1) |
0ddec0fc8 seccomp: Sysctl t... |
696 697 698 |
#define SECCOMP_LOG_TRAP (1 << 2) #define SECCOMP_LOG_ERRNO (1 << 3) #define SECCOMP_LOG_TRACE (1 << 4) |
59f5cf44a seccomp: Action t... |
699 700 |
#define SECCOMP_LOG_LOG (1 << 5) #define SECCOMP_LOG_ALLOW (1 << 6) |
6a21cc50f seccomp: add a re... |
701 |
#define SECCOMP_LOG_USER_NOTIF (1 << 7) |
0ddec0fc8 seccomp: Sysctl t... |
702 |
|
4d3b0b05a seccomp: Introduc... |
703 704 |
static u32 seccomp_actions_logged = SECCOMP_LOG_KILL_PROCESS | SECCOMP_LOG_KILL_THREAD | |
fd76875ca seccomp: Rename S... |
705 706 |
SECCOMP_LOG_TRAP | SECCOMP_LOG_ERRNO | |
6a21cc50f seccomp: add a re... |
707 |
SECCOMP_LOG_USER_NOTIF | |
fd76875ca seccomp: Rename S... |
708 |
SECCOMP_LOG_TRACE | |
59f5cf44a seccomp: Action t... |
709 |
SECCOMP_LOG_LOG; |
0ddec0fc8 seccomp: Sysctl t... |
710 |
|
e66a39977 seccomp: Filter f... |
711 712 |
static inline void seccomp_log(unsigned long syscall, long signr, u32 action, bool requested) |
0ddec0fc8 seccomp: Sysctl t... |
713 714 715 716 717 |
{ bool log = false; switch (action) { case SECCOMP_RET_ALLOW: |
e66a39977 seccomp: Filter f... |
718 |
break; |
0ddec0fc8 seccomp: Sysctl t... |
719 |
case SECCOMP_RET_TRAP: |
e66a39977 seccomp: Filter f... |
720 721 |
log = requested && seccomp_actions_logged & SECCOMP_LOG_TRAP; break; |
0ddec0fc8 seccomp: Sysctl t... |
722 |
case SECCOMP_RET_ERRNO: |
e66a39977 seccomp: Filter f... |
723 724 |
log = requested && seccomp_actions_logged & SECCOMP_LOG_ERRNO; break; |
0ddec0fc8 seccomp: Sysctl t... |
725 |
case SECCOMP_RET_TRACE: |
e66a39977 seccomp: Filter f... |
726 |
log = requested && seccomp_actions_logged & SECCOMP_LOG_TRACE; |
0ddec0fc8 seccomp: Sysctl t... |
727 |
break; |
6a21cc50f seccomp: add a re... |
728 729 730 |
case SECCOMP_RET_USER_NOTIF: log = requested && seccomp_actions_logged & SECCOMP_LOG_USER_NOTIF; break; |
59f5cf44a seccomp: Action t... |
731 732 733 |
case SECCOMP_RET_LOG: log = seccomp_actions_logged & SECCOMP_LOG_LOG; break; |
fd76875ca seccomp: Rename S... |
734 |
case SECCOMP_RET_KILL_THREAD: |
fd76875ca seccomp: Rename S... |
735 |
log = seccomp_actions_logged & SECCOMP_LOG_KILL_THREAD; |
4d3b0b05a seccomp: Introduc... |
736 737 738 739 |
break; case SECCOMP_RET_KILL_PROCESS: default: log = seccomp_actions_logged & SECCOMP_LOG_KILL_PROCESS; |
0ddec0fc8 seccomp: Sysctl t... |
740 741 742 |
} /* |
326bee028 seccomp: Don't sp... |
743 744 745 746 |
* Emit an audit message when the action is RET_KILL_*, RET_LOG, or the * FILTER_FLAG_LOG bit was set. The admin has the ability to silence * any action from being logged by removing the action name from the * seccomp_actions_logged sysctl. |
0ddec0fc8 seccomp: Sysctl t... |
747 |
*/ |
326bee028 seccomp: Don't sp... |
748 749 |
if (!log) return; |
0ddec0fc8 seccomp: Sysctl t... |
750 |
|
326bee028 seccomp: Don't sp... |
751 |
audit_seccomp(syscall, signr, action); |
0ddec0fc8 seccomp: Sysctl t... |
752 |
} |
1da177e4c Linux-2.6.12-rc2 |
753 754 755 756 757 |
/* * Secure computing mode 1 allows only read/write/exit/sigreturn. * To be fully secure this must be combined with rlimit * to limit the stack allocations too. */ |
cb4253aa0 secomp: Constify ... |
758 |
static const int mode1_syscalls[] = { |
1da177e4c Linux-2.6.12-rc2 |
759 |
__NR_seccomp_read, __NR_seccomp_write, __NR_seccomp_exit, __NR_seccomp_sigreturn, |
fe4bfff86 seccomp: Use -1 m... |
760 |
-1, /* negative terminated */ |
1da177e4c Linux-2.6.12-rc2 |
761 |
}; |
a4412fc94 seccomp,x86,arm,m... |
762 |
static void __secure_computing_strict(int this_syscall) |
1da177e4c Linux-2.6.12-rc2 |
763 |
{ |
fe4bfff86 seccomp: Use -1 m... |
764 |
const int *allowed_syscalls = mode1_syscalls; |
a4412fc94 seccomp,x86,arm,m... |
765 |
#ifdef CONFIG_COMPAT |
5c38065e0 seccomp: check in... |
766 |
if (in_compat_syscall()) |
fe4bfff86 seccomp: Use -1 m... |
767 |
allowed_syscalls = get_compat_mode1_syscalls(); |
a4412fc94 seccomp,x86,arm,m... |
768 769 |
#endif do { |
fe4bfff86 seccomp: Use -1 m... |
770 |
if (*allowed_syscalls == this_syscall) |
a4412fc94 seccomp,x86,arm,m... |
771 |
return; |
fe4bfff86 seccomp: Use -1 m... |
772 |
} while (*++allowed_syscalls != -1); |
a4412fc94 seccomp,x86,arm,m... |
773 774 775 776 |
#ifdef SECCOMP_DEBUG dump_stack(); #endif |
fd76875ca seccomp: Rename S... |
777 |
seccomp_log(this_syscall, SIGKILL, SECCOMP_RET_KILL_THREAD, true); |
a4412fc94 seccomp,x86,arm,m... |
778 779 780 781 782 783 784 |
do_exit(SIGKILL); } #ifndef CONFIG_HAVE_ARCH_SECCOMP_FILTER void secure_computing_strict(int this_syscall) { int mode = current->seccomp.mode; |
97f2645f3 tree-wide: replac... |
785 |
if (IS_ENABLED(CONFIG_CHECKPOINT_RESTORE) && |
13c4a9011 seccomp: add ptra... |
786 787 |
unlikely(current->ptrace & PT_SUSPEND_SECCOMP)) return; |
221272f97 seccomp: swap har... |
788 |
if (mode == SECCOMP_MODE_DISABLED) |
a4412fc94 seccomp,x86,arm,m... |
789 790 791 792 793 794 795 |
return; else if (mode == SECCOMP_MODE_STRICT) __secure_computing_strict(this_syscall); else BUG(); } #else |
13aa72f0f seccomp: Refactor... |
796 797 |
#ifdef CONFIG_SECCOMP_FILTER |
6a21cc50f seccomp: add a re... |
798 799 800 801 802 803 804 805 806 |
static u64 seccomp_next_notify_id(struct seccomp_filter *filter) { /* * Note: overflow is ok here, the id just needs to be unique per * filter. */ lockdep_assert_held(&filter->notify_lock); return filter->notif->next_id++; } |
7cf97b125 seccomp: Introduc... |
807 808 809 810 811 812 813 814 815 816 |
static void seccomp_handle_addfd(struct seccomp_kaddfd *addfd) { /* * Remove the notification, and reset the list pointers, indicating * that it has been handled. */ list_del_init(&addfd->list); addfd->ret = receive_fd_replace(addfd->fd, addfd->file, addfd->flags); complete(&addfd->completion); } |
fb3c5386b seccomp: add SECC... |
817 818 819 |
static int seccomp_do_user_notification(int this_syscall, struct seccomp_filter *match, const struct seccomp_data *sd) |
6a21cc50f seccomp: add a re... |
820 821 |
{ int err; |
fb3c5386b seccomp: add SECC... |
822 |
u32 flags = 0; |
6a21cc50f seccomp: add a re... |
823 824 |
long ret = 0; struct seccomp_knotif n = {}; |
7cf97b125 seccomp: Introduc... |
825 |
struct seccomp_kaddfd *addfd, *tmp; |
6a21cc50f seccomp: add a re... |
826 827 828 829 830 831 832 833 834 835 836 837 |
mutex_lock(&match->notify_lock); err = -ENOSYS; if (!match->notif) goto out; n.task = current; n.state = SECCOMP_NOTIFY_INIT; n.data = sd; n.id = seccomp_next_notify_id(match); init_completion(&n.ready); list_add(&n.list, &match->notif->notifications); |
7cf97b125 seccomp: Introduc... |
838 |
INIT_LIST_HEAD(&n.addfd); |
6a21cc50f seccomp: add a re... |
839 840 |
up(&match->notif->request); |
76194c4e8 seccomp: Lift wai... |
841 |
wake_up_poll(&match->wqh, EPOLLIN | EPOLLRDNORM); |
6a21cc50f seccomp: add a re... |
842 843 844 845 846 |
mutex_unlock(&match->notify_lock); /* * This is where we wait for a reply from userspace. */ |
7cf97b125 seccomp: Introduc... |
847 |
wait: |
6a21cc50f seccomp: add a re... |
848 849 850 |
err = wait_for_completion_interruptible(&n.ready); mutex_lock(&match->notify_lock); if (err == 0) { |
7cf97b125 seccomp: Introduc... |
851 852 853 854 855 856 857 858 |
/* Check if we were woken up by a addfd message */ addfd = list_first_entry_or_null(&n.addfd, struct seccomp_kaddfd, list); if (addfd && n.state != SECCOMP_NOTIFY_REPLIED) { seccomp_handle_addfd(addfd); mutex_unlock(&match->notify_lock); goto wait; } |
6a21cc50f seccomp: add a re... |
859 860 |
ret = n.val; err = n.error; |
fb3c5386b seccomp: add SECC... |
861 |
flags = n.flags; |
6a21cc50f seccomp: add a re... |
862 |
} |
7cf97b125 seccomp: Introduc... |
863 864 865 866 867 868 869 |
/* If there were any pending addfd calls, clear them out */ list_for_each_entry_safe(addfd, tmp, &n.addfd, list) { /* The process went away before we got a chance to handle it */ addfd->ret = -ESRCH; list_del_init(&addfd->list); complete(&addfd->completion); } |
6a21cc50f seccomp: add a re... |
870 871 |
/* * Note that it's possible the listener died in between the time when |
7cf97b125 seccomp: Introduc... |
872 |
* we were notified of a response (or a signal) and when we were able to |
6a21cc50f seccomp: add a re... |
873 874 875 876 877 878 879 880 881 882 883 |
* re-acquire the lock, so only delete from the list if the * notification actually exists. * * Also note that this test is only valid because there's no way to * *reattach* to a notifier right now. If one is added, we'll need to * keep track of the notif itself and make sure they match here. */ if (match->notif) list_del(&n.list); out: mutex_unlock(&match->notify_lock); |
fb3c5386b seccomp: add SECC... |
884 885 886 887 |
/* Userspace requests to continue the syscall. */ if (flags & SECCOMP_USER_NOTIF_FLAG_CONTINUE) return 0; |
2d9ca267a seccomp: Use curr... |
888 |
syscall_set_return_value(current, current_pt_regs(), |
6a21cc50f seccomp: add a re... |
889 |
err, ret); |
fb3c5386b seccomp: add SECC... |
890 |
return -1; |
6a21cc50f seccomp: add a re... |
891 |
} |
ce6526e8a seccomp: recheck ... |
892 893 |
static int __seccomp_filter(int this_syscall, const struct seccomp_data *sd, const bool recheck_after_trace) |
13aa72f0f seccomp: Refactor... |
894 895 |
{ u32 filter_ret, action; |
deb4de8b3 seccomp: Provide ... |
896 |
struct seccomp_filter *match = NULL; |
13aa72f0f seccomp: Refactor... |
897 |
int data; |
db5113911 seccomp: hoist st... |
898 |
struct seccomp_data sd_local; |
1da177e4c Linux-2.6.12-rc2 |
899 |
|
3ba2530cc seccomp: allow mo... |
900 901 902 903 904 |
/* * Make sure that any changes to mode from another thread have * been seen after TIF_SECCOMP was seen. */ rmb(); |
db5113911 seccomp: hoist st... |
905 906 907 908 |
if (!sd) { populate_seccomp_data(&sd_local); sd = &sd_local; } |
deb4de8b3 seccomp: Provide ... |
909 |
filter_ret = seccomp_run_filters(sd, &match); |
13aa72f0f seccomp: Refactor... |
910 |
data = filter_ret & SECCOMP_RET_DATA; |
0466bdb99 seccomp: Implemen... |
911 |
action = filter_ret & SECCOMP_RET_ACTION_FULL; |
13aa72f0f seccomp: Refactor... |
912 913 914 |
switch (action) { case SECCOMP_RET_ERRNO: |
580c57f10 seccomp: cap SECC... |
915 916 917 |
/* Set low-order bits as an errno, capped at MAX_ERRNO. */ if (data > MAX_ERRNO) data = MAX_ERRNO; |
2d9ca267a seccomp: Use curr... |
918 |
syscall_set_return_value(current, current_pt_regs(), |
13aa72f0f seccomp: Refactor... |
919 920 921 922 923 |
-data, 0); goto skip; case SECCOMP_RET_TRAP: /* Show the handler the original registers. */ |
2d9ca267a seccomp: Use curr... |
924 |
syscall_rollback(current, current_pt_regs()); |
13aa72f0f seccomp: Refactor... |
925 926 927 928 929 |
/* Let the filter pass back 16 bits of data. */ seccomp_send_sigsys(this_syscall, data); goto skip; case SECCOMP_RET_TRACE: |
ce6526e8a seccomp: recheck ... |
930 931 932 |
/* We've been put in this state by the ptracer already. */ if (recheck_after_trace) return 0; |
8112c4f14 seccomp: remove 2... |
933 934 935 |
/* ENOSYS these calls if there is no tracer attached. */ if (!ptrace_event_enabled(current, PTRACE_EVENT_SECCOMP)) { syscall_set_return_value(current, |
2d9ca267a seccomp: Use curr... |
936 |
current_pt_regs(), |
8112c4f14 seccomp: remove 2... |
937 938 939 940 941 942 943 944 |
-ENOSYS, 0); goto skip; } /* Allow the BPF to provide the event message */ ptrace_event(PTRACE_EVENT_SECCOMP, data); /* * The delivery of a fatal signal during event |
485a252a5 seccomp: Fix trac... |
945 946 947 948 949 950 951 |
* notification may silently skip tracer notification, * which could leave us with a potentially unmodified * syscall that the tracer would have liked to have * changed. Since the process is about to die, we just * force the syscall to be skipped and let the signal * kill the process and correctly handle any tracer exit * notifications. |
8112c4f14 seccomp: remove 2... |
952 953 |
*/ if (fatal_signal_pending(current)) |
485a252a5 seccomp: Fix trac... |
954 |
goto skip; |
8112c4f14 seccomp: remove 2... |
955 |
/* Check if the tracer forced the syscall to be skipped. */ |
2d9ca267a seccomp: Use curr... |
956 |
this_syscall = syscall_get_nr(current, current_pt_regs()); |
8112c4f14 seccomp: remove 2... |
957 958 |
if (this_syscall < 0) goto skip; |
ce6526e8a seccomp: recheck ... |
959 960 961 962 963 964 965 966 |
/* * Recheck the syscall, since it may have changed. This * intentionally uses a NULL struct seccomp_data to force * a reload of all registers. This does not goto skip since * a skip would have already been reported. */ if (__seccomp_filter(this_syscall, NULL, true)) return -1; |
8112c4f14 seccomp: remove 2... |
967 |
return 0; |
13aa72f0f seccomp: Refactor... |
968 |
|
6a21cc50f seccomp: add a re... |
969 |
case SECCOMP_RET_USER_NOTIF: |
fb3c5386b seccomp: add SECC... |
970 971 972 973 |
if (seccomp_do_user_notification(this_syscall, match, sd)) goto skip; return 0; |
6a21cc50f seccomp: add a re... |
974 |
|
59f5cf44a seccomp: Action t... |
975 976 977 |
case SECCOMP_RET_LOG: seccomp_log(this_syscall, 0, action, true); return 0; |
13aa72f0f seccomp: Refactor... |
978 |
case SECCOMP_RET_ALLOW: |
deb4de8b3 seccomp: Provide ... |
979 980 981 982 983 |
/* * Note that the "match" filter will always be NULL for * this action since SECCOMP_RET_ALLOW is the starting * state in seccomp_run_filters(). */ |
8112c4f14 seccomp: remove 2... |
984 |
return 0; |
13aa72f0f seccomp: Refactor... |
985 |
|
fd76875ca seccomp: Rename S... |
986 |
case SECCOMP_RET_KILL_THREAD: |
4d3b0b05a seccomp: Introduc... |
987 |
case SECCOMP_RET_KILL_PROCESS: |
131b63515 seccomp: Clean up... |
988 |
default: |
e66a39977 seccomp: Filter f... |
989 |
seccomp_log(this_syscall, SIGSYS, action, true); |
d7276e321 seccomp: Only dum... |
990 |
/* Dump core only if this is the last remaining thread. */ |
4d671d922 seccomp: kill pro... |
991 |
if (action != SECCOMP_RET_KILL_THREAD || |
4d3b0b05a seccomp: Introduc... |
992 |
get_nr_threads(current) == 1) { |
ae7795bc6 signal: Distingui... |
993 |
kernel_siginfo_t info; |
131b63515 seccomp: Clean up... |
994 |
|
d7276e321 seccomp: Only dum... |
995 |
/* Show the original registers in the dump. */ |
2d9ca267a seccomp: Use curr... |
996 |
syscall_rollback(current, current_pt_regs()); |
d7276e321 seccomp: Only dum... |
997 998 999 1000 |
/* Trigger a manual coredump since do_exit skips it. */ seccomp_init_siginfo(&info, this_syscall, data); do_coredump(&info); } |
4d671d922 seccomp: kill pro... |
1001 |
if (action == SECCOMP_RET_KILL_THREAD) |
4d3b0b05a seccomp: Introduc... |
1002 |
do_exit(SIGSYS); |
4d671d922 seccomp: kill pro... |
1003 1004 |
else do_group_exit(SIGSYS); |
13aa72f0f seccomp: Refactor... |
1005 1006 1007 1008 1009 |
} unreachable(); skip: |
e66a39977 seccomp: Filter f... |
1010 |
seccomp_log(this_syscall, 0, action, match ? match->log : false); |
8112c4f14 seccomp: remove 2... |
1011 1012 1013 |
return -1; } #else |
ce6526e8a seccomp: recheck ... |
1014 1015 |
static int __seccomp_filter(int this_syscall, const struct seccomp_data *sd, const bool recheck_after_trace) |
8112c4f14 seccomp: remove 2... |
1016 1017 |
{ BUG(); |
13aa72f0f seccomp: Refactor... |
1018 |
} |
1da177e4c Linux-2.6.12-rc2 |
1019 |
#endif |
13aa72f0f seccomp: Refactor... |
1020 |
|
8112c4f14 seccomp: remove 2... |
1021 |
int __secure_computing(const struct seccomp_data *sd) |
13aa72f0f seccomp: Refactor... |
1022 1023 |
{ int mode = current->seccomp.mode; |
8112c4f14 seccomp: remove 2... |
1024 |
int this_syscall; |
13aa72f0f seccomp: Refactor... |
1025 |
|
97f2645f3 tree-wide: replac... |
1026 |
if (IS_ENABLED(CONFIG_CHECKPOINT_RESTORE) && |
13c4a9011 seccomp: add ptra... |
1027 |
unlikely(current->ptrace & PT_SUSPEND_SECCOMP)) |
8112c4f14 seccomp: remove 2... |
1028 1029 1030 |
return 0; this_syscall = sd ? sd->nr : |
2d9ca267a seccomp: Use curr... |
1031 |
syscall_get_nr(current, current_pt_regs()); |
13c4a9011 seccomp: add ptra... |
1032 |
|
13aa72f0f seccomp: Refactor... |
1033 |
switch (mode) { |
e2cfabdfd seccomp: add syst... |
1034 |
case SECCOMP_MODE_STRICT: |
13aa72f0f seccomp: Refactor... |
1035 |
__secure_computing_strict(this_syscall); /* may call do_exit */ |
8112c4f14 seccomp: remove 2... |
1036 |
return 0; |
13aa72f0f seccomp: Refactor... |
1037 |
case SECCOMP_MODE_FILTER: |
ce6526e8a seccomp: recheck ... |
1038 |
return __seccomp_filter(this_syscall, sd, false); |
1da177e4c Linux-2.6.12-rc2 |
1039 1040 1041 |
default: BUG(); } |
13aa72f0f seccomp: Refactor... |
1042 |
} |
a4412fc94 seccomp,x86,arm,m... |
1043 |
#endif /* CONFIG_HAVE_ARCH_SECCOMP_FILTER */ |
1d9d02fee move seccomp from... |
1044 1045 1046 1047 1048 |
long prctl_get_seccomp(void) { return current->seccomp.mode; } |
e2cfabdfd seccomp: add syst... |
1049 |
/** |
3b23dd128 seccomp: split mo... |
1050 |
* seccomp_set_mode_strict: internal function for setting strict seccomp |
e2cfabdfd seccomp: add syst... |
1051 1052 1053 1054 1055 |
* * Once current->seccomp.mode is non-zero, it may not be changed. * * Returns 0 on success or -EINVAL on failure. */ |
3b23dd128 seccomp: split mo... |
1056 |
static long seccomp_set_mode_strict(void) |
1d9d02fee move seccomp from... |
1057 |
{ |
3b23dd128 seccomp: split mo... |
1058 |
const unsigned long seccomp_mode = SECCOMP_MODE_STRICT; |
e2cfabdfd seccomp: add syst... |
1059 |
long ret = -EINVAL; |
1d9d02fee move seccomp from... |
1060 |
|
dbd952127 seccomp: introduc... |
1061 |
spin_lock_irq(¤t->sighand->siglock); |
1f41b4504 seccomp: extract ... |
1062 |
if (!seccomp_may_assign_mode(seccomp_mode)) |
1d9d02fee move seccomp from... |
1063 |
goto out; |
cf99abace make seccomp zero... |
1064 |
#ifdef TIF_NOTSC |
3b23dd128 seccomp: split mo... |
1065 |
disable_TSC(); |
cf99abace make seccomp zero... |
1066 |
#endif |
00a02d0c5 seccomp: Add filt... |
1067 |
seccomp_assign_mode(current, seccomp_mode, 0); |
3b23dd128 seccomp: split mo... |
1068 1069 1070 |
ret = 0; out: |
dbd952127 seccomp: introduc... |
1071 |
spin_unlock_irq(¤t->sighand->siglock); |
3b23dd128 seccomp: split mo... |
1072 1073 1074 |
return ret; } |
e2cfabdfd seccomp: add syst... |
1075 |
#ifdef CONFIG_SECCOMP_FILTER |
e83931790 seccomp: don't le... |
1076 1077 1078 1079 1080 |
static void seccomp_notify_free(struct seccomp_filter *filter) { kfree(filter->notif); filter->notif = NULL; } |
a566a9012 seccomp: don't le... |
1081 |
static void seccomp_notify_detach(struct seccomp_filter *filter) |
6a21cc50f seccomp: add a re... |
1082 |
{ |
6a21cc50f seccomp: add a re... |
1083 |
struct seccomp_knotif *knotif; |
a811dc615 seccomp: fix UAF ... |
1084 |
if (!filter) |
a566a9012 seccomp: don't le... |
1085 |
return; |
a811dc615 seccomp: fix UAF ... |
1086 |
|
6a21cc50f seccomp: add a re... |
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 |
mutex_lock(&filter->notify_lock); /* * If this file is being closed because e.g. the task who owned it * died, let's wake everyone up who was waiting on us. */ list_for_each_entry(knotif, &filter->notif->notifications, list) { if (knotif->state == SECCOMP_NOTIFY_REPLIED) continue; knotif->state = SECCOMP_NOTIFY_REPLIED; knotif->error = -ENOSYS; knotif->val = 0; |
7cf97b125 seccomp: Introduc... |
1100 1101 1102 1103 1104 |
/* * We do not need to wake up any pending addfd messages, as * the notifier will do that for us, as this just looks * like a standard reply. */ |
6a21cc50f seccomp: add a re... |
1105 1106 |
complete(&knotif->ready); } |
e83931790 seccomp: don't le... |
1107 |
seccomp_notify_free(filter); |
6a21cc50f seccomp: add a re... |
1108 |
mutex_unlock(&filter->notify_lock); |
a566a9012 seccomp: don't le... |
1109 1110 1111 1112 1113 1114 1115 |
} static int seccomp_notify_release(struct inode *inode, struct file *file) { struct seccomp_filter *filter = file->private_data; seccomp_notify_detach(filter); |
6a21cc50f seccomp: add a re... |
1116 1117 1118 |
__put_seccomp_filter(filter); return 0; } |
9f87dcf14 seccomp: Add find... |
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 |
/* must be called with notif_lock held */ static inline struct seccomp_knotif * find_notification(struct seccomp_filter *filter, u64 id) { struct seccomp_knotif *cur; lockdep_assert_held(&filter->notify_lock); list_for_each_entry(cur, &filter->notif->notifications, list) { if (cur->id == id) return cur; } return NULL; } |
6a21cc50f seccomp: add a re... |
1134 1135 1136 1137 1138 1139 |
static long seccomp_notify_recv(struct seccomp_filter *filter, void __user *buf) { struct seccomp_knotif *knotif = NULL, *cur; struct seccomp_notif unotif; ssize_t ret; |
2882d53c9 seccomp: Check th... |
1140 1141 1142 1143 1144 1145 |
/* Verify that we're not given garbage to keep struct extensible. */ ret = check_zeroed_user(buf, sizeof(unotif)); if (ret < 0) return ret; if (!ret) return -EINVAL; |
6a21cc50f seccomp: add a re... |
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 |
memset(&unotif, 0, sizeof(unotif)); ret = down_interruptible(&filter->notif->request); if (ret < 0) return ret; mutex_lock(&filter->notify_lock); list_for_each_entry(cur, &filter->notif->notifications, list) { if (cur->state == SECCOMP_NOTIFY_INIT) { knotif = cur; break; } } /* * If we didn't find a notification, it could be that the task was * interrupted by a fatal signal between the time we were woken and * when we were able to acquire the rw lock. */ if (!knotif) { ret = -ENOENT; goto out; } unotif.id = knotif->id; unotif.pid = task_pid_vnr(knotif->task); unotif.data = *(knotif->data); knotif->state = SECCOMP_NOTIFY_SENT; |
76194c4e8 seccomp: Lift wai... |
1175 |
wake_up_poll(&filter->wqh, EPOLLOUT | EPOLLWRNORM); |
6a21cc50f seccomp: add a re... |
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 |
ret = 0; out: mutex_unlock(&filter->notify_lock); if (ret == 0 && copy_to_user(buf, &unotif, sizeof(unotif))) { ret = -EFAULT; /* * Userspace screwed up. To make sure that we keep this * notification alive, let's reset it back to INIT. It * may have died when we released the lock, so we need to make * sure it's still around. */ |
6a21cc50f seccomp: add a re... |
1189 |
mutex_lock(&filter->notify_lock); |
9f87dcf14 seccomp: Add find... |
1190 |
knotif = find_notification(filter, unotif.id); |
6a21cc50f seccomp: add a re... |
1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 |
if (knotif) { knotif->state = SECCOMP_NOTIFY_INIT; up(&filter->notif->request); } mutex_unlock(&filter->notify_lock); } return ret; } static long seccomp_notify_send(struct seccomp_filter *filter, void __user *buf) { struct seccomp_notif_resp resp = {}; |
9f87dcf14 seccomp: Add find... |
1205 |
struct seccomp_knotif *knotif; |
6a21cc50f seccomp: add a re... |
1206 1207 1208 1209 |
long ret; if (copy_from_user(&resp, buf, sizeof(resp))) return -EFAULT; |
fb3c5386b seccomp: add SECC... |
1210 1211 1212 1213 1214 |
if (resp.flags & ~SECCOMP_USER_NOTIF_FLAG_CONTINUE) return -EINVAL; if ((resp.flags & SECCOMP_USER_NOTIF_FLAG_CONTINUE) && (resp.error || resp.val)) |
6a21cc50f seccomp: add a re... |
1215 1216 1217 1218 1219 |
return -EINVAL; ret = mutex_lock_interruptible(&filter->notify_lock); if (ret < 0) return ret; |
9f87dcf14 seccomp: Add find... |
1220 |
knotif = find_notification(filter, resp.id); |
6a21cc50f seccomp: add a re... |
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 |
if (!knotif) { ret = -ENOENT; goto out; } /* Allow exactly one reply. */ if (knotif->state != SECCOMP_NOTIFY_SENT) { ret = -EINPROGRESS; goto out; } ret = 0; knotif->state = SECCOMP_NOTIFY_REPLIED; knotif->error = resp.error; knotif->val = resp.val; |
fb3c5386b seccomp: add SECC... |
1236 |
knotif->flags = resp.flags; |
6a21cc50f seccomp: add a re... |
1237 1238 1239 1240 1241 1242 1243 1244 1245 |
complete(&knotif->ready); out: mutex_unlock(&filter->notify_lock); return ret; } static long seccomp_notify_id_valid(struct seccomp_filter *filter, void __user *buf) { |
9f87dcf14 seccomp: Add find... |
1246 |
struct seccomp_knotif *knotif; |
6a21cc50f seccomp: add a re... |
1247 1248 1249 1250 1251 1252 1253 1254 1255 |
u64 id; long ret; if (copy_from_user(&id, buf, sizeof(id))) return -EFAULT; ret = mutex_lock_interruptible(&filter->notify_lock); if (ret < 0) return ret; |
9f87dcf14 seccomp: Add find... |
1256 1257 1258 1259 1260 |
knotif = find_notification(filter, id); if (knotif && knotif->state == SECCOMP_NOTIFY_SENT) ret = 0; else ret = -ENOENT; |
6a21cc50f seccomp: add a re... |
1261 |
|
6a21cc50f seccomp: add a re... |
1262 1263 1264 |
mutex_unlock(&filter->notify_lock); return ret; } |
7cf97b125 seccomp: Introduc... |
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 |
static long seccomp_notify_addfd(struct seccomp_filter *filter, struct seccomp_notif_addfd __user *uaddfd, unsigned int size) { struct seccomp_notif_addfd addfd; struct seccomp_knotif *knotif; struct seccomp_kaddfd kaddfd; int ret; BUILD_BUG_ON(sizeof(addfd) < SECCOMP_NOTIFY_ADDFD_SIZE_VER0); BUILD_BUG_ON(sizeof(addfd) != SECCOMP_NOTIFY_ADDFD_SIZE_LATEST); if (size < SECCOMP_NOTIFY_ADDFD_SIZE_VER0 || size >= PAGE_SIZE) return -EINVAL; ret = copy_struct_from_user(&addfd, sizeof(addfd), uaddfd, size); if (ret) return ret; if (addfd.newfd_flags & ~O_CLOEXEC) return -EINVAL; if (addfd.flags & ~SECCOMP_ADDFD_FLAG_SETFD) return -EINVAL; if (addfd.newfd && !(addfd.flags & SECCOMP_ADDFD_FLAG_SETFD)) return -EINVAL; kaddfd.file = fget(addfd.srcfd); if (!kaddfd.file) return -EBADF; kaddfd.flags = addfd.newfd_flags; kaddfd.fd = (addfd.flags & SECCOMP_ADDFD_FLAG_SETFD) ? addfd.newfd : -1; init_completion(&kaddfd.completion); ret = mutex_lock_interruptible(&filter->notify_lock); if (ret < 0) goto out; knotif = find_notification(filter, addfd.id); if (!knotif) { ret = -ENOENT; goto out_unlock; } /* * We do not want to allow for FD injection to occur before the * notification has been picked up by a userspace handler, or after * the notification has been replied to. */ if (knotif->state != SECCOMP_NOTIFY_SENT) { ret = -EINPROGRESS; goto out_unlock; } list_add(&kaddfd.list, &knotif->addfd); complete(&knotif->ready); mutex_unlock(&filter->notify_lock); /* Now we wait for it to be processed or be interrupted */ ret = wait_for_completion_interruptible(&kaddfd.completion); if (ret == 0) { /* * We had a successful completion. The other side has already * removed us from the addfd queue, and * wait_for_completion_interruptible has a memory barrier upon * success that lets us read this value directly without * locking. */ ret = kaddfd.ret; goto out; } mutex_lock(&filter->notify_lock); /* * Even though we were woken up by a signal and not a successful * completion, a completion may have happened in the mean time. * * We need to check again if the addfd request has been handled, * and if not, we will remove it from the queue. */ if (list_empty(&kaddfd.list)) ret = kaddfd.ret; else list_del(&kaddfd.list); out_unlock: mutex_unlock(&filter->notify_lock); out: fput(kaddfd.file); return ret; } |
6a21cc50f seccomp: add a re... |
1360 1361 1362 1363 1364 |
static long seccomp_notify_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct seccomp_filter *filter = file->private_data; void __user *buf = (void __user *)arg; |
7cf97b125 seccomp: Introduc... |
1365 |
/* Fixed-size ioctls */ |
6a21cc50f seccomp: add a re... |
1366 1367 1368 1369 1370 |
switch (cmd) { case SECCOMP_IOCTL_NOTIF_RECV: return seccomp_notify_recv(filter, buf); case SECCOMP_IOCTL_NOTIF_SEND: return seccomp_notify_send(filter, buf); |
47e33c05f seccomp: Fix ioct... |
1371 |
case SECCOMP_IOCTL_NOTIF_ID_VALID_WRONG_DIR: |
6a21cc50f seccomp: add a re... |
1372 1373 |
case SECCOMP_IOCTL_NOTIF_ID_VALID: return seccomp_notify_id_valid(filter, buf); |
7cf97b125 seccomp: Introduc... |
1374 1375 1376 1377 1378 1379 1380 |
} /* Extensible Argument ioctls */ #define EA_IOCTL(cmd) ((cmd) & ~(IOC_INOUT | IOCSIZE_MASK)) switch (EA_IOCTL(cmd)) { case EA_IOCTL(SECCOMP_IOCTL_NOTIF_ADDFD): return seccomp_notify_addfd(filter, buf, _IOC_SIZE(cmd)); |
6a21cc50f seccomp: add a re... |
1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 |
default: return -EINVAL; } } static __poll_t seccomp_notify_poll(struct file *file, struct poll_table_struct *poll_tab) { struct seccomp_filter *filter = file->private_data; __poll_t ret = 0; struct seccomp_knotif *cur; |
76194c4e8 seccomp: Lift wai... |
1392 |
poll_wait(file, &filter->wqh, poll_tab); |
6a21cc50f seccomp: add a re... |
1393 |
|
319deec7d seccomp: fix poor... |
1394 |
if (mutex_lock_interruptible(&filter->notify_lock) < 0) |
6a21cc50f seccomp: add a re... |
1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 |
return EPOLLERR; list_for_each_entry(cur, &filter->notif->notifications, list) { if (cur->state == SECCOMP_NOTIFY_INIT) ret |= EPOLLIN | EPOLLRDNORM; if (cur->state == SECCOMP_NOTIFY_SENT) ret |= EPOLLOUT | EPOLLWRNORM; if ((ret & EPOLLIN) && (ret & EPOLLOUT)) break; } mutex_unlock(&filter->notify_lock); |
99cdb8b9a seccomp: notify a... |
1407 1408 |
if (refcount_read(&filter->users) == 0) ret |= EPOLLHUP; |
6a21cc50f seccomp: add a re... |
1409 1410 1411 1412 1413 1414 1415 |
return ret; } static const struct file_operations seccomp_notify_ops = { .poll = seccomp_notify_poll, .release = seccomp_notify_release, .unlocked_ioctl = seccomp_notify_ioctl, |
3db81afd9 seccomp: Add miss... |
1416 |
.compat_ioctl = seccomp_notify_ioctl, |
6a21cc50f seccomp: add a re... |
1417 1418 1419 1420 |
}; static struct file *init_listener(struct seccomp_filter *filter) { |
dfe719fef seccomp: Make dup... |
1421 |
struct file *ret; |
6a21cc50f seccomp: add a re... |
1422 1423 1424 1425 1426 1427 1428 1429 1430 |
ret = ERR_PTR(-ENOMEM); filter->notif = kzalloc(sizeof(*(filter->notif)), GFP_KERNEL); if (!filter->notif) goto out; sema_init(&filter->notif->request, 0); filter->notif->next_id = get_random_u64(); INIT_LIST_HEAD(&filter->notif->notifications); |
6a21cc50f seccomp: add a re... |
1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 |
ret = anon_inode_getfile("seccomp notify", &seccomp_notify_ops, filter, O_RDWR); if (IS_ERR(ret)) goto out_notif; /* The file has a reference to it now */ __get_seccomp_filter(filter); out_notif: if (IS_ERR(ret)) |
e83931790 seccomp: don't le... |
1442 |
seccomp_notify_free(filter); |
6a21cc50f seccomp: add a re... |
1443 1444 1445 |
out: return ret; } |
dfe719fef seccomp: Make dup... |
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 |
/* * Does @new_child have a listener while an ancestor also has a listener? * If so, we'll want to reject this filter. * This only has to be tested for the current process, even in the TSYNC case, * because TSYNC installs @child with the same parent on all threads. * Note that @new_child is not hooked up to its parent at this point yet, so * we use current->seccomp.filter. */ static bool has_duplicate_listener(struct seccomp_filter *new_child) { struct seccomp_filter *cur; /* must be protected against concurrent TSYNC */ lockdep_assert_held(¤t->sighand->siglock); if (!new_child->notif) return false; for (cur = current->seccomp.filter; cur; cur = cur->prev) { if (cur->notif) return true; } return false; } |
3b23dd128 seccomp: split mo... |
1470 1471 |
/** * seccomp_set_mode_filter: internal function for setting seccomp filter |
48dc92b9f seccomp: add "sec... |
1472 |
* @flags: flags to change filter behavior |
3b23dd128 seccomp: split mo... |
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 |
* @filter: struct sock_fprog containing filter * * This function may be called repeatedly to install additional filters. * Every filter successfully installed will be evaluated (in reverse order) * for each system call the task makes. * * Once current->seccomp.mode is non-zero, it may not be changed. * * Returns 0 on success or -EINVAL on failure. */ |
48dc92b9f seccomp: add "sec... |
1483 1484 |
static long seccomp_set_mode_filter(unsigned int flags, const char __user *filter) |
3b23dd128 seccomp: split mo... |
1485 1486 |
{ const unsigned long seccomp_mode = SECCOMP_MODE_FILTER; |
c8bee430d seccomp: split fi... |
1487 |
struct seccomp_filter *prepared = NULL; |
3b23dd128 seccomp: split mo... |
1488 |
long ret = -EINVAL; |
6a21cc50f seccomp: add a re... |
1489 1490 |
int listener = -1; struct file *listener_f = NULL; |
3b23dd128 seccomp: split mo... |
1491 |
|
48dc92b9f seccomp: add "sec... |
1492 |
/* Validate flags. */ |
c2e1f2e30 seccomp: implemen... |
1493 |
if (flags & ~SECCOMP_FILTER_FLAG_MASK) |
dbd952127 seccomp: introduc... |
1494 |
return -EINVAL; |
48dc92b9f seccomp: add "sec... |
1495 |
|
7a0df7fbc seccomp: Make NEW... |
1496 1497 1498 1499 |
/* * In the successful case, NEW_LISTENER returns the new listener fd. * But in the failure case, TSYNC returns the thread that died. If you * combine these two flags, there's no way to tell whether something |
51891498f seccomp: allow TS... |
1500 1501 |
* succeeded or failed. So, let's disallow this combination if the user * has not explicitly requested no errors from TSYNC. |
7a0df7fbc seccomp: Make NEW... |
1502 1503 |
*/ if ((flags & SECCOMP_FILTER_FLAG_TSYNC) && |
51891498f seccomp: allow TS... |
1504 1505 |
(flags & SECCOMP_FILTER_FLAG_NEW_LISTENER) && ((flags & SECCOMP_FILTER_FLAG_TSYNC_ESRCH) == 0)) |
7a0df7fbc seccomp: Make NEW... |
1506 |
return -EINVAL; |
c8bee430d seccomp: split fi... |
1507 1508 1509 1510 |
/* Prepare the new filter before holding any locks. */ prepared = seccomp_prepare_user_filter(filter); if (IS_ERR(prepared)) return PTR_ERR(prepared); |
6a21cc50f seccomp: add a re... |
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 |
if (flags & SECCOMP_FILTER_FLAG_NEW_LISTENER) { listener = get_unused_fd_flags(O_CLOEXEC); if (listener < 0) { ret = listener; goto out_free; } listener_f = init_listener(prepared); if (IS_ERR(listener_f)) { put_unused_fd(listener); ret = PTR_ERR(listener_f); goto out_free; } } |
c2e1f2e30 seccomp: implemen... |
1525 1526 1527 1528 1529 1530 |
/* * Make sure we cannot change seccomp or nnp state via TSYNC * while another thread is in the middle of calling exec. */ if (flags & SECCOMP_FILTER_FLAG_TSYNC && mutex_lock_killable(¤t->signal->cred_guard_mutex)) |
6a21cc50f seccomp: add a re... |
1531 |
goto out_put_fd; |
c2e1f2e30 seccomp: implemen... |
1532 |
|
dbd952127 seccomp: introduc... |
1533 |
spin_lock_irq(¤t->sighand->siglock); |
3b23dd128 seccomp: split mo... |
1534 1535 |
if (!seccomp_may_assign_mode(seccomp_mode)) goto out; |
dfe719fef seccomp: Make dup... |
1536 1537 1538 1539 |
if (has_duplicate_listener(prepared)) { ret = -EBUSY; goto out; } |
c8bee430d seccomp: split fi... |
1540 |
ret = seccomp_attach_filter(flags, prepared); |
3b23dd128 seccomp: split mo... |
1541 |
if (ret) |
e2cfabdfd seccomp: add syst... |
1542 |
goto out; |
c8bee430d seccomp: split fi... |
1543 1544 |
/* Do not free the successfully attached filter. */ prepared = NULL; |
1d9d02fee move seccomp from... |
1545 |
|
00a02d0c5 seccomp: Add filt... |
1546 |
seccomp_assign_mode(current, seccomp_mode, flags); |
e2cfabdfd seccomp: add syst... |
1547 |
out: |
dbd952127 seccomp: introduc... |
1548 |
spin_unlock_irq(¤t->sighand->siglock); |
c2e1f2e30 seccomp: implemen... |
1549 1550 |
if (flags & SECCOMP_FILTER_FLAG_TSYNC) mutex_unlock(¤t->signal->cred_guard_mutex); |
6a21cc50f seccomp: add a re... |
1551 1552 |
out_put_fd: if (flags & SECCOMP_FILTER_FLAG_NEW_LISTENER) { |
7a0df7fbc seccomp: Make NEW... |
1553 |
if (ret) { |
a811dc615 seccomp: fix UAF ... |
1554 |
listener_f->private_data = NULL; |
6a21cc50f seccomp: add a re... |
1555 1556 |
fput(listener_f); put_unused_fd(listener); |
a566a9012 seccomp: don't le... |
1557 |
seccomp_notify_detach(prepared); |
6a21cc50f seccomp: add a re... |
1558 1559 1560 1561 1562 |
} else { fd_install(listener, listener_f); ret = listener; } } |
c2e1f2e30 seccomp: implemen... |
1563 |
out_free: |
c8bee430d seccomp: split fi... |
1564 |
seccomp_filter_free(prepared); |
1d9d02fee move seccomp from... |
1565 1566 |
return ret; } |
3b23dd128 seccomp: split mo... |
1567 |
#else |
48dc92b9f seccomp: add "sec... |
1568 1569 |
static inline long seccomp_set_mode_filter(unsigned int flags, const char __user *filter) |
3b23dd128 seccomp: split mo... |
1570 1571 1572 1573 |
{ return -EINVAL; } #endif |
d78ab02c2 seccomp: create i... |
1574 |
|
d612b1fd8 seccomp: Operatio... |
1575 1576 1577 1578 1579 1580 1581 1582 |
static long seccomp_get_action_avail(const char __user *uaction) { u32 action; if (copy_from_user(&action, uaction, sizeof(action))) return -EFAULT; switch (action) { |
0466bdb99 seccomp: Implemen... |
1583 |
case SECCOMP_RET_KILL_PROCESS: |
fd76875ca seccomp: Rename S... |
1584 |
case SECCOMP_RET_KILL_THREAD: |
d612b1fd8 seccomp: Operatio... |
1585 1586 |
case SECCOMP_RET_TRAP: case SECCOMP_RET_ERRNO: |
6a21cc50f seccomp: add a re... |
1587 |
case SECCOMP_RET_USER_NOTIF: |
d612b1fd8 seccomp: Operatio... |
1588 |
case SECCOMP_RET_TRACE: |
59f5cf44a seccomp: Action t... |
1589 |
case SECCOMP_RET_LOG: |
d612b1fd8 seccomp: Operatio... |
1590 1591 1592 1593 1594 1595 1596 1597 |
case SECCOMP_RET_ALLOW: break; default: return -EOPNOTSUPP; } return 0; } |
6a21cc50f seccomp: add a re... |
1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 |
static long seccomp_get_notif_sizes(void __user *usizes) { struct seccomp_notif_sizes sizes = { .seccomp_notif = sizeof(struct seccomp_notif), .seccomp_notif_resp = sizeof(struct seccomp_notif_resp), .seccomp_data = sizeof(struct seccomp_data), }; if (copy_to_user(usizes, &sizes, sizeof(sizes))) return -EFAULT; return 0; } |
48dc92b9f seccomp: add "sec... |
1611 1612 |
/* Common entry point for both prctl and syscall. */ static long do_seccomp(unsigned int op, unsigned int flags, |
a5662e4d8 seccomp: switch s... |
1613 |
void __user *uargs) |
48dc92b9f seccomp: add "sec... |
1614 1615 1616 1617 1618 1619 1620 1621 |
{ switch (op) { case SECCOMP_SET_MODE_STRICT: if (flags != 0 || uargs != NULL) return -EINVAL; return seccomp_set_mode_strict(); case SECCOMP_SET_MODE_FILTER: return seccomp_set_mode_filter(flags, uargs); |
d612b1fd8 seccomp: Operatio... |
1622 1623 1624 1625 1626 |
case SECCOMP_GET_ACTION_AVAIL: if (flags != 0) return -EINVAL; return seccomp_get_action_avail(uargs); |
6a21cc50f seccomp: add a re... |
1627 1628 1629 1630 1631 |
case SECCOMP_GET_NOTIF_SIZES: if (flags != 0) return -EINVAL; return seccomp_get_notif_sizes(uargs); |
48dc92b9f seccomp: add "sec... |
1632 1633 1634 1635 1636 1637 |
default: return -EINVAL; } } SYSCALL_DEFINE3(seccomp, unsigned int, op, unsigned int, flags, |
a5662e4d8 seccomp: switch s... |
1638 |
void __user *, uargs) |
48dc92b9f seccomp: add "sec... |
1639 1640 1641 |
{ return do_seccomp(op, flags, uargs); } |
d78ab02c2 seccomp: create i... |
1642 1643 1644 1645 1646 1647 1648 |
/** * prctl_set_seccomp: configures current->seccomp.mode * @seccomp_mode: requested mode to use * @filter: optional struct sock_fprog for use with SECCOMP_MODE_FILTER * * Returns 0 on success or -EINVAL on failure. */ |
a5662e4d8 seccomp: switch s... |
1649 |
long prctl_set_seccomp(unsigned long seccomp_mode, void __user *filter) |
d78ab02c2 seccomp: create i... |
1650 |
{ |
48dc92b9f seccomp: add "sec... |
1651 |
unsigned int op; |
a5662e4d8 seccomp: switch s... |
1652 |
void __user *uargs; |
48dc92b9f seccomp: add "sec... |
1653 |
|
3b23dd128 seccomp: split mo... |
1654 1655 |
switch (seccomp_mode) { case SECCOMP_MODE_STRICT: |
48dc92b9f seccomp: add "sec... |
1656 1657 1658 1659 1660 1661 1662 1663 |
op = SECCOMP_SET_MODE_STRICT; /* * Setting strict mode through prctl always ignored filter, * so make sure it is always NULL here to pass the internal * check in do_seccomp(). */ uargs = NULL; break; |
3b23dd128 seccomp: split mo... |
1664 |
case SECCOMP_MODE_FILTER: |
48dc92b9f seccomp: add "sec... |
1665 1666 1667 |
op = SECCOMP_SET_MODE_FILTER; uargs = filter; break; |
3b23dd128 seccomp: split mo... |
1668 1669 1670 |
default: return -EINVAL; } |
48dc92b9f seccomp: add "sec... |
1671 1672 1673 |
/* prctl interface doesn't have flags, so they are always zero. */ return do_seccomp(op, 0, uargs); |
d78ab02c2 seccomp: create i... |
1674 |
} |
f8e529ed9 seccomp, ptrace: ... |
1675 1676 |
#if defined(CONFIG_SECCOMP_FILTER) && defined(CONFIG_CHECKPOINT_RESTORE) |
f06eae831 seccomp: hoist ou... |
1677 1678 |
static struct seccomp_filter *get_nth_filter(struct task_struct *task, unsigned long filter_off) |
f8e529ed9 seccomp, ptrace: ... |
1679 |
{ |
f06eae831 seccomp: hoist ou... |
1680 1681 |
struct seccomp_filter *orig, *filter; unsigned long count; |
f8e529ed9 seccomp, ptrace: ... |
1682 |
|
f06eae831 seccomp: hoist ou... |
1683 1684 1685 1686 |
/* * Note: this is only correct because the caller should be the (ptrace) * tracer of the task, otherwise lock_task_sighand is needed. */ |
f8e529ed9 seccomp, ptrace: ... |
1687 |
spin_lock_irq(&task->sighand->siglock); |
f06eae831 seccomp: hoist ou... |
1688 |
|
f8e529ed9 seccomp, ptrace: ... |
1689 |
if (task->seccomp.mode != SECCOMP_MODE_FILTER) { |
f06eae831 seccomp: hoist ou... |
1690 1691 |
spin_unlock_irq(&task->sighand->siglock); return ERR_PTR(-EINVAL); |
f8e529ed9 seccomp, ptrace: ... |
1692 |
} |
f06eae831 seccomp: hoist ou... |
1693 1694 1695 1696 1697 1698 |
orig = task->seccomp.filter; __get_seccomp_filter(orig); spin_unlock_irq(&task->sighand->siglock); count = 0; for (filter = orig; filter; filter = filter->prev) |
f8e529ed9 seccomp, ptrace: ... |
1699 |
count++; |
f8e529ed9 seccomp, ptrace: ... |
1700 1701 |
if (filter_off >= count) { |
f06eae831 seccomp: hoist ou... |
1702 |
filter = ERR_PTR(-ENOENT); |
f8e529ed9 seccomp, ptrace: ... |
1703 1704 |
goto out; } |
f8e529ed9 seccomp, ptrace: ... |
1705 |
|
f06eae831 seccomp: hoist ou... |
1706 1707 |
count -= filter_off; for (filter = orig; filter && count > 1; filter = filter->prev) |
f8e529ed9 seccomp, ptrace: ... |
1708 |
count--; |
f8e529ed9 seccomp, ptrace: ... |
1709 1710 |
if (WARN_ON(count != 1 || !filter)) { |
f06eae831 seccomp: hoist ou... |
1711 |
filter = ERR_PTR(-ENOENT); |
f8e529ed9 seccomp, ptrace: ... |
1712 1713 |
goto out; } |
f06eae831 seccomp: hoist ou... |
1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 |
__get_seccomp_filter(filter); out: __put_seccomp_filter(orig); return filter; } long seccomp_get_filter(struct task_struct *task, unsigned long filter_off, void __user *data) { struct seccomp_filter *filter; struct sock_fprog_kern *fprog; long ret; if (!capable(CAP_SYS_ADMIN) || current->seccomp.mode != SECCOMP_MODE_DISABLED) { return -EACCES; } filter = get_nth_filter(task, filter_off); if (IS_ERR(filter)) return PTR_ERR(filter); |
f8e529ed9 seccomp, ptrace: ... |
1736 1737 |
fprog = filter->prog->orig_prog; if (!fprog) { |
470bf1f27 seccomp: Fix comm... |
1738 |
/* This must be a new non-cBPF filter, since we save |
f8e529ed9 seccomp, ptrace: ... |
1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 |
* every cBPF filter's orig_prog above when * CONFIG_CHECKPOINT_RESTORE is enabled. */ ret = -EMEDIUMTYPE; goto out; } ret = fprog->len; if (!data) goto out; |
f8e529ed9 seccomp, ptrace: ... |
1749 1750 |
if (copy_to_user(data, fprog->filter, bpf_classic_proglen(fprog))) ret = -EFAULT; |
f8e529ed9 seccomp, ptrace: ... |
1751 |
out: |
66a733ea6 seccomp: fix the ... |
1752 |
__put_seccomp_filter(filter); |
f8e529ed9 seccomp, ptrace: ... |
1753 |
return ret; |
f8e529ed9 seccomp, ptrace: ... |
1754 |
} |
f8e529ed9 seccomp, ptrace: ... |
1755 |
|
26500475a ptrace, seccomp: ... |
1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 |
long seccomp_get_metadata(struct task_struct *task, unsigned long size, void __user *data) { long ret; struct seccomp_filter *filter; struct seccomp_metadata kmd = {}; if (!capable(CAP_SYS_ADMIN) || current->seccomp.mode != SECCOMP_MODE_DISABLED) { return -EACCES; } size = min_t(unsigned long, size, sizeof(kmd)); |
63bb0045b ptrace, seccomp: ... |
1769 1770 1771 1772 |
if (size < sizeof(kmd.filter_off)) return -EINVAL; if (copy_from_user(&kmd.filter_off, data, sizeof(kmd.filter_off))) |
26500475a ptrace, seccomp: ... |
1773 1774 1775 1776 1777 |
return -EFAULT; filter = get_nth_filter(task, kmd.filter_off); if (IS_ERR(filter)) return PTR_ERR(filter); |
26500475a ptrace, seccomp: ... |
1778 1779 1780 1781 1782 1783 1784 1785 |
if (filter->log) kmd.flags |= SECCOMP_FILTER_FLAG_LOG; ret = size; if (copy_to_user(data, &kmd, size)) ret = -EFAULT; __put_seccomp_filter(filter); |
f8e529ed9 seccomp, ptrace: ... |
1786 1787 1788 |
return ret; } #endif |
8e5f1ad11 seccomp: Sysctl t... |
1789 1790 1791 1792 |
#ifdef CONFIG_SYSCTL /* Human readable action names for friendly sysctl interaction */ |
0466bdb99 seccomp: Implemen... |
1793 |
#define SECCOMP_RET_KILL_PROCESS_NAME "kill_process" |
fd76875ca seccomp: Rename S... |
1794 |
#define SECCOMP_RET_KILL_THREAD_NAME "kill_thread" |
8e5f1ad11 seccomp: Sysctl t... |
1795 1796 |
#define SECCOMP_RET_TRAP_NAME "trap" #define SECCOMP_RET_ERRNO_NAME "errno" |
6a21cc50f seccomp: add a re... |
1797 |
#define SECCOMP_RET_USER_NOTIF_NAME "user_notif" |
8e5f1ad11 seccomp: Sysctl t... |
1798 |
#define SECCOMP_RET_TRACE_NAME "trace" |
59f5cf44a seccomp: Action t... |
1799 |
#define SECCOMP_RET_LOG_NAME "log" |
8e5f1ad11 seccomp: Sysctl t... |
1800 |
#define SECCOMP_RET_ALLOW_NAME "allow" |
fd76875ca seccomp: Rename S... |
1801 |
static const char seccomp_actions_avail[] = |
0466bdb99 seccomp: Implemen... |
1802 |
SECCOMP_RET_KILL_PROCESS_NAME " " |
fd76875ca seccomp: Rename S... |
1803 1804 1805 |
SECCOMP_RET_KILL_THREAD_NAME " " SECCOMP_RET_TRAP_NAME " " SECCOMP_RET_ERRNO_NAME " " |
6a21cc50f seccomp: add a re... |
1806 |
SECCOMP_RET_USER_NOTIF_NAME " " |
fd76875ca seccomp: Rename S... |
1807 1808 1809 |
SECCOMP_RET_TRACE_NAME " " SECCOMP_RET_LOG_NAME " " SECCOMP_RET_ALLOW_NAME; |
8e5f1ad11 seccomp: Sysctl t... |
1810 |
|
0ddec0fc8 seccomp: Sysctl t... |
1811 1812 1813 1814 1815 1816 |
struct seccomp_log_name { u32 log; const char *name; }; static const struct seccomp_log_name seccomp_log_names[] = { |
0466bdb99 seccomp: Implemen... |
1817 |
{ SECCOMP_LOG_KILL_PROCESS, SECCOMP_RET_KILL_PROCESS_NAME }, |
fd76875ca seccomp: Rename S... |
1818 |
{ SECCOMP_LOG_KILL_THREAD, SECCOMP_RET_KILL_THREAD_NAME }, |
0ddec0fc8 seccomp: Sysctl t... |
1819 1820 |
{ SECCOMP_LOG_TRAP, SECCOMP_RET_TRAP_NAME }, { SECCOMP_LOG_ERRNO, SECCOMP_RET_ERRNO_NAME }, |
6a21cc50f seccomp: add a re... |
1821 |
{ SECCOMP_LOG_USER_NOTIF, SECCOMP_RET_USER_NOTIF_NAME }, |
0ddec0fc8 seccomp: Sysctl t... |
1822 |
{ SECCOMP_LOG_TRACE, SECCOMP_RET_TRACE_NAME }, |
59f5cf44a seccomp: Action t... |
1823 |
{ SECCOMP_LOG_LOG, SECCOMP_RET_LOG_NAME }, |
0ddec0fc8 seccomp: Sysctl t... |
1824 1825 1826 1827 1828 |
{ SECCOMP_LOG_ALLOW, SECCOMP_RET_ALLOW_NAME }, { } }; static bool seccomp_names_from_actions_logged(char *names, size_t size, |
beb44acaf seccomp: Configur... |
1829 1830 |
u32 actions_logged, const char *sep) |
0ddec0fc8 seccomp: Sysctl t... |
1831 1832 |
{ const struct seccomp_log_name *cur; |
beb44acaf seccomp: Configur... |
1833 |
bool append_sep = false; |
0ddec0fc8 seccomp: Sysctl t... |
1834 1835 1836 1837 1838 1839 |
for (cur = seccomp_log_names; cur->name && size; cur++) { ssize_t ret; if (!(actions_logged & cur->log)) continue; |
beb44acaf seccomp: Configur... |
1840 1841 |
if (append_sep) { ret = strscpy(names, sep, size); |
0ddec0fc8 seccomp: Sysctl t... |
1842 1843 1844 1845 1846 1847 |
if (ret < 0) return false; names += ret; size -= ret; } else |
beb44acaf seccomp: Configur... |
1848 |
append_sep = true; |
0ddec0fc8 seccomp: Sysctl t... |
1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 |
ret = strscpy(names, cur->name, size); if (ret < 0) return false; names += ret; size -= ret; } return true; } static bool seccomp_action_logged_from_name(u32 *action_logged, const char *name) { const struct seccomp_log_name *cur; for (cur = seccomp_log_names; cur->name; cur++) { if (!strcmp(cur->name, name)) { *action_logged = cur->log; return true; } } return false; } static bool seccomp_actions_logged_from_names(u32 *actions_logged, char *names) { char *name; *actions_logged = 0; while ((name = strsep(&names, " ")) && *name) { u32 action_logged = 0; if (!seccomp_action_logged_from_name(&action_logged, name)) return false; *actions_logged |= action_logged; } return true; } |
d013db029 seccomp: Separate... |
1892 1893 |
static int read_actions_logged(struct ctl_table *ro_table, void __user *buffer, size_t *lenp, loff_t *ppos) |
0ddec0fc8 seccomp: Sysctl t... |
1894 1895 1896 |
{ char names[sizeof(seccomp_actions_avail)]; struct ctl_table table; |
d013db029 seccomp: Separate... |
1897 1898 1899 1900 |
memset(names, 0, sizeof(names)); if (!seccomp_names_from_actions_logged(names, sizeof(names), |
beb44acaf seccomp: Configur... |
1901 |
seccomp_actions_logged, " ")) |
d013db029 seccomp: Separate... |
1902 1903 1904 1905 1906 1907 1908 1909 1910 |
return -EINVAL; table = *ro_table; table.data = names; table.maxlen = sizeof(names); return proc_dostring(&table, 0, buffer, lenp, ppos); } static int write_actions_logged(struct ctl_table *ro_table, void __user *buffer, |
ea6eca778 seccomp: Audit at... |
1911 |
size_t *lenp, loff_t *ppos, u32 *actions_logged) |
0ddec0fc8 seccomp: Sysctl t... |
1912 1913 1914 1915 |
{ char names[sizeof(seccomp_actions_avail)]; struct ctl_table table; int ret; |
d013db029 seccomp: Separate... |
1916 |
if (!capable(CAP_SYS_ADMIN)) |
0ddec0fc8 seccomp: Sysctl t... |
1917 1918 1919 |
return -EPERM; memset(names, 0, sizeof(names)); |
0ddec0fc8 seccomp: Sysctl t... |
1920 1921 1922 |
table = *ro_table; table.data = names; table.maxlen = sizeof(names); |
d013db029 seccomp: Separate... |
1923 |
ret = proc_dostring(&table, 1, buffer, lenp, ppos); |
0ddec0fc8 seccomp: Sysctl t... |
1924 1925 |
if (ret) return ret; |
ea6eca778 seccomp: Audit at... |
1926 |
if (!seccomp_actions_logged_from_names(actions_logged, table.data)) |
d013db029 seccomp: Separate... |
1927 |
return -EINVAL; |
0ddec0fc8 seccomp: Sysctl t... |
1928 |
|
ea6eca778 seccomp: Audit at... |
1929 |
if (*actions_logged & SECCOMP_LOG_ALLOW) |
d013db029 seccomp: Separate... |
1930 |
return -EINVAL; |
0ddec0fc8 seccomp: Sysctl t... |
1931 |
|
ea6eca778 seccomp: Audit at... |
1932 |
seccomp_actions_logged = *actions_logged; |
0ddec0fc8 seccomp: Sysctl t... |
1933 1934 |
return 0; } |
0ddec0fc8 seccomp: Sysctl t... |
1935 |
|
ea6eca778 seccomp: Audit at... |
1936 1937 1938 1939 1940 1941 1942 |
static void audit_actions_logged(u32 actions_logged, u32 old_actions_logged, int ret) { char names[sizeof(seccomp_actions_avail)]; char old_names[sizeof(seccomp_actions_avail)]; const char *new = names; const char *old = old_names; |
0ddec0fc8 seccomp: Sysctl t... |
1943 |
|
ea6eca778 seccomp: Audit at... |
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 |
if (!audit_enabled) return; memset(names, 0, sizeof(names)); memset(old_names, 0, sizeof(old_names)); if (ret) new = "?"; else if (!actions_logged) new = "(none)"; else if (!seccomp_names_from_actions_logged(names, sizeof(names), actions_logged, ",")) new = "?"; if (!old_actions_logged) old = "(none)"; else if (!seccomp_names_from_actions_logged(old_names, sizeof(old_names), old_actions_logged, ",")) old = "?"; return audit_seccomp_actions_logged(new, old, !ret); } |
d013db029 seccomp: Separate... |
1967 |
static int seccomp_actions_logged_handler(struct ctl_table *ro_table, int write, |
32927393d sysctl: pass kern... |
1968 |
void *buffer, size_t *lenp, |
d013db029 seccomp: Separate... |
1969 1970 |
loff_t *ppos) { |
ea6eca778 seccomp: Audit at... |
1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 |
int ret; if (write) { u32 actions_logged = 0; u32 old_actions_logged = seccomp_actions_logged; ret = write_actions_logged(ro_table, buffer, lenp, ppos, &actions_logged); audit_actions_logged(actions_logged, old_actions_logged, ret); } else ret = read_actions_logged(ro_table, buffer, lenp, ppos); return ret; |
0ddec0fc8 seccomp: Sysctl t... |
1984 |
} |
8e5f1ad11 seccomp: Sysctl t... |
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 |
static struct ctl_path seccomp_sysctl_path[] = { { .procname = "kernel", }, { .procname = "seccomp", }, { } }; static struct ctl_table seccomp_sysctl_table[] = { { .procname = "actions_avail", .data = (void *) &seccomp_actions_avail, .maxlen = sizeof(seccomp_actions_avail), .mode = 0444, .proc_handler = proc_dostring, }, |
0ddec0fc8 seccomp: Sysctl t... |
1999 2000 2001 2002 2003 |
{ .procname = "actions_logged", .mode = 0644, .proc_handler = seccomp_actions_logged_handler, }, |
8e5f1ad11 seccomp: Sysctl t... |
2004 2005 2006 2007 2008 2009 2010 2011 2012 |
{ } }; static int __init seccomp_sysctl_init(void) { struct ctl_table_header *hdr; hdr = register_sysctl_paths(seccomp_sysctl_path, seccomp_sysctl_table); if (!hdr) |
e68f9d49d seccomp: Use pr_fmt |
2013 2014 |
pr_warn("sysctl registration failed "); |
8e5f1ad11 seccomp: Sysctl t... |
2015 2016 2017 2018 2019 2020 2021 2022 2023 |
else kmemleak_not_leak(hdr); return 0; } device_initcall(seccomp_sysctl_init) #endif /* CONFIG_SYSCTL */ |