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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
d7832d2c | 2 | |
d7832d2c | 3 | #include <errno.h> |
3ffd4af2 | 4 | #include <grp.h> |
d7832d2c | 5 | #include <stdio.h> |
11c3a366 | 6 | #include <stdlib.h> |
d7832d2c KS |
7 | #include <sys/capability.h> |
8 | #include <sys/prctl.h> | |
3ffd4af2 | 9 | #include <unistd.h> |
d7832d2c | 10 | |
b5efdb8a | 11 | #include "alloc-util.h" |
430f0182 | 12 | #include "capability-util.h" |
3ffd4af2 LP |
13 | #include "fileio.h" |
14 | #include "log.h" | |
d7832d2c | 15 | #include "macro.h" |
a22692d7 | 16 | #include "missing_prctl.h" |
6bedfcbb | 17 | #include "parse-util.h" |
36d85478 | 18 | #include "user-util.h" |
d7832d2c | 19 | #include "util.h" |
d7832d2c KS |
20 | |
21 | int have_effective_cap(int value) { | |
5ce70e5b | 22 | _cleanup_cap_free_ cap_t cap; |
d7832d2c | 23 | cap_flag_value_t fv; |
d7832d2c | 24 | |
ec8927ca LP |
25 | cap = cap_get_proc(); |
26 | if (!cap) | |
d7832d2c KS |
27 | return -errno; |
28 | ||
29 | if (cap_get_flag(cap, value, CAP_EFFECTIVE, &fv) < 0) | |
5ce70e5b | 30 | return -errno; |
15ce3f26 LP |
31 | |
32 | return fv == CAP_SET; | |
d7832d2c KS |
33 | } |
34 | ||
35 | unsigned long cap_last_cap(void) { | |
ec202eae SL |
36 | static thread_local unsigned long saved; |
37 | static thread_local bool valid = false; | |
80b43783 | 38 | _cleanup_free_ char *content = NULL; |
a7f7d1bd | 39 | unsigned long p = 0; |
80b43783 | 40 | int r; |
d7832d2c KS |
41 | |
42 | if (valid) | |
43 | return saved; | |
44 | ||
80b43783 DH |
45 | /* available since linux-3.2 */ |
46 | r = read_one_line_file("/proc/sys/kernel/cap_last_cap", &content); | |
47 | if (r >= 0) { | |
48 | r = safe_atolu(content, &p); | |
49 | if (r >= 0) { | |
5211445e LP |
50 | |
51 | if (p > 63) /* Safety for the future: if one day the kernel learns more than 64 caps, | |
52 | * then we are in trouble (since we, as much userspace and kernel space | |
d09a2585 | 53 | * store capability masks in uint64_t types). Let's hence protect |
5211445e LP |
54 | * ourselves against that and always cap at 63 for now. */ |
55 | p = 63; | |
56 | ||
80b43783 DH |
57 | saved = p; |
58 | valid = true; | |
59 | return p; | |
60 | } | |
61 | } | |
62 | ||
63 | /* fall back to syscall-probing for pre linux-3.2 */ | |
d7832d2c KS |
64 | p = (unsigned long) CAP_LAST_CAP; |
65 | ||
66 | if (prctl(PR_CAPBSET_READ, p) < 0) { | |
67 | ||
5211445e | 68 | /* Hmm, look downwards, until we find one that works */ |
d7832d2c KS |
69 | for (p--; p > 0; p --) |
70 | if (prctl(PR_CAPBSET_READ, p) >= 0) | |
71 | break; | |
72 | ||
73 | } else { | |
74 | ||
5211445e LP |
75 | /* Hmm, look upwards, until we find one that doesn't work */ |
76 | for (; p < 63; p++) | |
d7832d2c KS |
77 | if (prctl(PR_CAPBSET_READ, p+1) < 0) |
78 | break; | |
79 | } | |
80 | ||
81 | saved = p; | |
82 | valid = true; | |
83 | ||
84 | return p; | |
85 | } | |
ec8927ca | 86 | |
755d4b67 IP |
87 | int capability_update_inherited_set(cap_t caps, uint64_t set) { |
88 | unsigned long i; | |
89 | ||
90 | /* Add capabilities in the set to the inherited caps. Do not apply | |
91 | * them yet. */ | |
92 | ||
93 | for (i = 0; i < cap_last_cap(); i++) { | |
94 | ||
95 | if (set & (UINT64_C(1) << i)) { | |
96 | cap_value_t v; | |
97 | ||
98 | v = (cap_value_t) i; | |
99 | ||
100 | /* Make the capability inheritable. */ | |
101 | if (cap_set_flag(caps, CAP_INHERITABLE, 1, &v, CAP_SET) < 0) | |
102 | return -errno; | |
103 | } | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | int capability_ambient_set_apply(uint64_t set, bool also_inherit) { | |
755d4b67 | 110 | _cleanup_cap_free_ cap_t caps = NULL; |
15ce3f26 LP |
111 | unsigned long i; |
112 | int r; | |
755d4b67 IP |
113 | |
114 | /* Add the capabilities to the ambient set. */ | |
115 | ||
116 | if (also_inherit) { | |
755d4b67 IP |
117 | caps = cap_get_proc(); |
118 | if (!caps) | |
119 | return -errno; | |
120 | ||
121 | r = capability_update_inherited_set(caps, set); | |
122 | if (r < 0) | |
123 | return -errno; | |
124 | ||
125 | if (cap_set_proc(caps) < 0) | |
126 | return -errno; | |
127 | } | |
128 | ||
129 | for (i = 0; i < cap_last_cap(); i++) { | |
130 | ||
131 | if (set & (UINT64_C(1) << i)) { | |
132 | ||
133 | /* Add the capability to the ambient set. */ | |
134 | if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, i, 0, 0) < 0) | |
135 | return -errno; | |
136 | } | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
a103496c | 142 | int capability_bounding_set_drop(uint64_t keep, bool right_now) { |
6067611a | 143 | _cleanup_cap_free_ cap_t before_cap = NULL, after_cap = NULL; |
ec8927ca | 144 | cap_flag_value_t fv; |
6a010ac9 | 145 | unsigned long i; |
ec8927ca LP |
146 | int r; |
147 | ||
148 | /* If we are run as PID 1 we will lack CAP_SETPCAP by default | |
149 | * in the effective set (yes, the kernel drops that when | |
150 | * executing init!), so get it back temporarily so that we can | |
151 | * call PR_CAPBSET_DROP. */ | |
152 | ||
6067611a LP |
153 | before_cap = cap_get_proc(); |
154 | if (!before_cap) | |
ec8927ca LP |
155 | return -errno; |
156 | ||
6067611a | 157 | if (cap_get_flag(before_cap, CAP_SETPCAP, CAP_EFFECTIVE, &fv) < 0) |
ec8927ca | 158 | return -errno; |
ec8927ca LP |
159 | |
160 | if (fv != CAP_SET) { | |
6a010ac9 | 161 | _cleanup_cap_free_ cap_t temp_cap = NULL; |
ec8927ca LP |
162 | static const cap_value_t v = CAP_SETPCAP; |
163 | ||
6067611a LP |
164 | temp_cap = cap_dup(before_cap); |
165 | if (!temp_cap) | |
166 | return -errno; | |
ec8927ca | 167 | |
6067611a LP |
168 | if (cap_set_flag(temp_cap, CAP_EFFECTIVE, 1, &v, CAP_SET) < 0) |
169 | return -errno; | |
ec8927ca | 170 | |
6067611a LP |
171 | if (cap_set_proc(temp_cap) < 0) |
172 | log_debug_errno(errno, "Can't acquire effective CAP_SETPCAP bit, ignoring: %m"); | |
173 | ||
174 | /* If we didn't manage to acquire the CAP_SETPCAP bit, we continue anyway, after all this just means | |
175 | * we'll fail later, when we actually intend to drop some capabilities. */ | |
ec8927ca LP |
176 | } |
177 | ||
6067611a LP |
178 | after_cap = cap_dup(before_cap); |
179 | if (!after_cap) | |
180 | return -errno; | |
181 | ||
ec8927ca | 182 | for (i = 0; i <= cap_last_cap(); i++) { |
6067611a | 183 | cap_value_t v; |
ec8927ca | 184 | |
6067611a LP |
185 | if ((keep & (UINT64_C(1) << i))) |
186 | continue; | |
ec8927ca | 187 | |
6067611a LP |
188 | /* Drop it from the bounding set */ |
189 | if (prctl(PR_CAPBSET_DROP, i) < 0) { | |
190 | r = -errno; | |
191 | ||
192 | /* If dropping the capability failed, let's see if we didn't have it in the first place. If so, | |
193 | * continue anyway, as dropping a capability we didn't have in the first place doesn't really | |
194 | * matter anyway. */ | |
195 | if (prctl(PR_CAPBSET_READ, i) != 0) | |
ec8927ca | 196 | goto finish; |
6067611a LP |
197 | } |
198 | v = (cap_value_t) i; | |
199 | ||
200 | /* Also drop it from the inheritable set, so | |
201 | * that anything we exec() loses the | |
202 | * capability for good. */ | |
203 | if (cap_set_flag(after_cap, CAP_INHERITABLE, 1, &v, CAP_CLEAR) < 0) { | |
204 | r = -errno; | |
205 | goto finish; | |
206 | } | |
ec8927ca | 207 | |
6067611a LP |
208 | /* If we shall apply this right now drop it |
209 | * also from our own capability sets. */ | |
210 | if (right_now) { | |
211 | if (cap_set_flag(after_cap, CAP_PERMITTED, 1, &v, CAP_CLEAR) < 0 || | |
212 | cap_set_flag(after_cap, CAP_EFFECTIVE, 1, &v, CAP_CLEAR) < 0) { | |
ec8927ca LP |
213 | r = -errno; |
214 | goto finish; | |
215 | } | |
ec8927ca LP |
216 | } |
217 | } | |
218 | ||
219 | r = 0; | |
220 | ||
221 | finish: | |
6067611a LP |
222 | if (cap_set_proc(after_cap) < 0) { |
223 | /* If there are no actual changes anyway then let's ignore this error. */ | |
224 | if (cap_compare(before_cap, after_cap) != 0) | |
225 | r = -errno; | |
226 | } | |
ec8927ca LP |
227 | |
228 | return r; | |
229 | } | |
939b8f14 | 230 | |
a103496c | 231 | static int drop_from_file(const char *fn, uint64_t keep) { |
3130fca5 | 232 | _cleanup_free_ char *p = NULL; |
939b8f14 | 233 | uint64_t current, after; |
3130fca5 LP |
234 | uint32_t hi, lo; |
235 | int r, k; | |
939b8f14 LP |
236 | |
237 | r = read_one_line_file(fn, &p); | |
238 | if (r < 0) | |
239 | return r; | |
240 | ||
241 | assert_cc(sizeof(hi) == sizeof(unsigned)); | |
242 | assert_cc(sizeof(lo) == sizeof(unsigned)); | |
243 | ||
244 | k = sscanf(p, "%u %u", &lo, &hi); | |
939b8f14 LP |
245 | if (k != 2) |
246 | return -EIO; | |
247 | ||
248 | current = (uint64_t) lo | ((uint64_t) hi << 32ULL); | |
a103496c | 249 | after = current & keep; |
939b8f14 LP |
250 | |
251 | if (current == after) | |
252 | return 0; | |
253 | ||
254 | lo = (unsigned) (after & 0xFFFFFFFFULL); | |
255 | hi = (unsigned) ((after >> 32ULL) & 0xFFFFFFFFULL); | |
256 | ||
3130fca5 | 257 | return write_string_filef(fn, WRITE_STRING_FILE_CREATE, "%u %u", lo, hi); |
939b8f14 LP |
258 | } |
259 | ||
a103496c | 260 | int capability_bounding_set_drop_usermode(uint64_t keep) { |
939b8f14 LP |
261 | int r; |
262 | ||
a103496c | 263 | r = drop_from_file("/proc/sys/kernel/usermodehelper/inheritable", keep); |
939b8f14 LP |
264 | if (r < 0) |
265 | return r; | |
266 | ||
a103496c | 267 | r = drop_from_file("/proc/sys/kernel/usermodehelper/bset", keep); |
939b8f14 LP |
268 | if (r < 0) |
269 | return r; | |
270 | ||
271 | return r; | |
272 | } | |
966bff26 | 273 | |
ed617ec2 | 274 | int drop_privileges(uid_t uid, gid_t gid, uint64_t keep_capabilities) { |
966bff26 LP |
275 | int r; |
276 | ||
bff74941 LP |
277 | /* Unfortunately we cannot leave privilege dropping to PID 1 here, since we want to run as user but |
278 | * want to keep some capabilities. Since file capabilities have been introduced this cannot be done | |
279 | * across exec() anymore, unless our binary has the capability configured in the file system, which | |
280 | * we want to avoid. */ | |
966bff26 | 281 | |
4a62c710 MS |
282 | if (setresgid(gid, gid, gid) < 0) |
283 | return log_error_errno(errno, "Failed to change group ID: %m"); | |
966bff26 | 284 | |
97f0e76f LP |
285 | r = maybe_setgroups(0, NULL); |
286 | if (r < 0) | |
287 | return log_error_errno(r, "Failed to drop auxiliary groups list: %m"); | |
966bff26 | 288 | |
bff74941 LP |
289 | /* Ensure we keep the permitted caps across the setresuid(). Note that we do this even if we actually |
290 | * don't want to keep any capabilities, since we want to be able to drop them from the bounding set | |
291 | * too, and we can only do that if we have capabilities. */ | |
51ddf615 | 292 | if (prctl(PR_SET_KEEPCAPS, 1) < 0) |
4a62c710 | 293 | return log_error_errno(errno, "Failed to enable keep capabilities flag: %m"); |
966bff26 | 294 | |
b1c05b98 | 295 | if (setresuid(uid, uid, uid) < 0) |
4a62c710 | 296 | return log_error_errno(errno, "Failed to change user ID: %m"); |
966bff26 | 297 | |
4a62c710 MS |
298 | if (prctl(PR_SET_KEEPCAPS, 0) < 0) |
299 | return log_error_errno(errno, "Failed to disable keep capabilities flag: %m"); | |
966bff26 | 300 | |
bff74941 LP |
301 | /* Drop all caps from the bounding set (as well as the inheritable/permitted/effective sets), except |
302 | * the ones we want to keep */ | |
a103496c | 303 | r = capability_bounding_set_drop(keep_capabilities, true); |
f647962d MS |
304 | if (r < 0) |
305 | return log_error_errno(r, "Failed to drop capabilities: %m"); | |
966bff26 | 306 | |
f11943c5 | 307 | /* Now upgrade the permitted caps we still kept to effective caps */ |
bff74941 | 308 | if (keep_capabilities != 0) { |
057255fb | 309 | cap_value_t bits[u64log2(keep_capabilities) + 1]; |
bff74941 LP |
310 | _cleanup_cap_free_ cap_t d = NULL; |
311 | unsigned i, j = 0; | |
312 | ||
313 | d = cap_init(); | |
314 | if (!d) | |
315 | return log_oom(); | |
6a010ac9 | 316 | |
7d328b54 | 317 | for (i = 0; i < ELEMENTSOF(bits); i++) |
51ddf615 ZJS |
318 | if (keep_capabilities & (1ULL << i)) |
319 | bits[j++] = i; | |
057255fb | 320 | |
2c9fc266 ZJS |
321 | /* use enough bits */ |
322 | assert(i == 64 || (keep_capabilities >> i) == 0); | |
323 | /* don't use too many bits */ | |
324 | assert(keep_capabilities & (1ULL << (i - 1))); | |
966bff26 | 325 | |
51ddf615 | 326 | if (cap_set_flag(d, CAP_EFFECTIVE, j, bits, CAP_SET) < 0 || |
e1427b13 MS |
327 | cap_set_flag(d, CAP_PERMITTED, j, bits, CAP_SET) < 0) |
328 | return log_error_errno(errno, "Failed to enable capabilities bits: %m"); | |
51ddf615 ZJS |
329 | |
330 | if (cap_set_proc(d) < 0) | |
331 | return log_error_errno(errno, "Failed to increase capabilities: %m"); | |
332 | } | |
966bff26 LP |
333 | |
334 | return 0; | |
335 | } | |
dd5ae4c3 PK |
336 | |
337 | int drop_capability(cap_value_t cv) { | |
338 | _cleanup_cap_free_ cap_t tmp_cap = NULL; | |
339 | ||
340 | tmp_cap = cap_get_proc(); | |
341 | if (!tmp_cap) | |
342 | return -errno; | |
343 | ||
344 | if ((cap_set_flag(tmp_cap, CAP_INHERITABLE, 1, &cv, CAP_CLEAR) < 0) || | |
345 | (cap_set_flag(tmp_cap, CAP_PERMITTED, 1, &cv, CAP_CLEAR) < 0) || | |
346 | (cap_set_flag(tmp_cap, CAP_EFFECTIVE, 1, &cv, CAP_CLEAR) < 0)) | |
347 | return -errno; | |
348 | ||
349 | if (cap_set_proc(tmp_cap) < 0) | |
350 | return -errno; | |
351 | ||
352 | return 0; | |
353 | } | |
39f608e4 LP |
354 | |
355 | bool ambient_capabilities_supported(void) { | |
356 | static int cache = -1; | |
357 | ||
358 | if (cache >= 0) | |
359 | return cache; | |
360 | ||
361 | /* If PR_CAP_AMBIENT returns something valid, or an unexpected error code we assume that ambient caps are | |
362 | * available. */ | |
363 | ||
364 | cache = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_KILL, 0, 0) >= 0 || | |
365 | !IN_SET(errno, EINVAL, EOPNOTSUPP, ENOSYS); | |
366 | ||
367 | return cache; | |
368 | } | |
d7391698 LP |
369 | |
370 | int capability_quintet_enforce(const CapabilityQuintet *q) { | |
371 | _cleanup_cap_free_ cap_t c = NULL; | |
9a2c5911 | 372 | bool need_set_proc_again = false; |
d7391698 LP |
373 | int r; |
374 | ||
375 | if (q->ambient != (uint64_t) -1) { | |
376 | unsigned long i; | |
377 | bool changed = false; | |
378 | ||
379 | c = cap_get_proc(); | |
380 | if (!c) | |
381 | return -errno; | |
382 | ||
383 | /* In order to raise the ambient caps set we first need to raise the matching inheritable + permitted | |
384 | * cap */ | |
385 | for (i = 0; i <= cap_last_cap(); i++) { | |
386 | uint64_t m = UINT64_C(1) << i; | |
387 | cap_value_t cv = (cap_value_t) i; | |
388 | cap_flag_value_t old_value_inheritable, old_value_permitted; | |
389 | ||
390 | if ((q->ambient & m) == 0) | |
391 | continue; | |
392 | ||
393 | if (cap_get_flag(c, cv, CAP_INHERITABLE, &old_value_inheritable) < 0) | |
394 | return -errno; | |
395 | if (cap_get_flag(c, cv, CAP_PERMITTED, &old_value_permitted) < 0) | |
396 | return -errno; | |
397 | ||
398 | if (old_value_inheritable == CAP_SET && old_value_permitted == CAP_SET) | |
399 | continue; | |
400 | ||
401 | if (cap_set_flag(c, CAP_INHERITABLE, 1, &cv, CAP_SET) < 0) | |
402 | return -errno; | |
d7391698 LP |
403 | if (cap_set_flag(c, CAP_PERMITTED, 1, &cv, CAP_SET) < 0) |
404 | return -errno; | |
405 | ||
406 | changed = true; | |
407 | } | |
408 | ||
409 | if (changed) | |
410 | if (cap_set_proc(c) < 0) | |
411 | return -errno; | |
412 | ||
413 | r = capability_ambient_set_apply(q->ambient, false); | |
414 | if (r < 0) | |
415 | return r; | |
416 | } | |
417 | ||
418 | if (q->inheritable != (uint64_t) -1 || q->permitted != (uint64_t) -1 || q->effective != (uint64_t) -1) { | |
419 | bool changed = false; | |
420 | unsigned long i; | |
421 | ||
422 | if (!c) { | |
423 | c = cap_get_proc(); | |
424 | if (!c) | |
425 | return -errno; | |
426 | } | |
427 | ||
428 | for (i = 0; i <= cap_last_cap(); i++) { | |
429 | uint64_t m = UINT64_C(1) << i; | |
430 | cap_value_t cv = (cap_value_t) i; | |
431 | ||
432 | if (q->inheritable != (uint64_t) -1) { | |
433 | cap_flag_value_t old_value, new_value; | |
434 | ||
248dd941 LP |
435 | if (cap_get_flag(c, cv, CAP_INHERITABLE, &old_value) < 0) { |
436 | if (errno == EINVAL) /* If the kernel knows more caps than this | |
437 | * version of libcap, then this will return | |
438 | * EINVAL. In that case, simply ignore it, | |
439 | * pretend it doesn't exist. */ | |
440 | continue; | |
441 | ||
d7391698 | 442 | return -errno; |
248dd941 | 443 | } |
d7391698 LP |
444 | |
445 | new_value = (q->inheritable & m) ? CAP_SET : CAP_CLEAR; | |
446 | ||
447 | if (old_value != new_value) { | |
448 | changed = true; | |
449 | ||
450 | if (cap_set_flag(c, CAP_INHERITABLE, 1, &cv, new_value) < 0) | |
451 | return -errno; | |
452 | } | |
453 | } | |
454 | ||
455 | if (q->permitted != (uint64_t) -1) { | |
456 | cap_flag_value_t old_value, new_value; | |
457 | ||
248dd941 LP |
458 | if (cap_get_flag(c, cv, CAP_PERMITTED, &old_value) < 0) { |
459 | if (errno == EINVAL) | |
460 | continue; | |
461 | ||
d7391698 | 462 | return -errno; |
248dd941 | 463 | } |
d7391698 LP |
464 | |
465 | new_value = (q->permitted & m) ? CAP_SET : CAP_CLEAR; | |
466 | ||
467 | if (old_value != new_value) { | |
468 | changed = true; | |
469 | ||
470 | if (cap_set_flag(c, CAP_PERMITTED, 1, &cv, new_value) < 0) | |
471 | return -errno; | |
472 | } | |
473 | } | |
474 | ||
475 | if (q->effective != (uint64_t) -1) { | |
476 | cap_flag_value_t old_value, new_value; | |
477 | ||
248dd941 LP |
478 | if (cap_get_flag(c, cv, CAP_EFFECTIVE, &old_value) < 0) { |
479 | if (errno == EINVAL) | |
480 | continue; | |
481 | ||
d7391698 | 482 | return -errno; |
248dd941 | 483 | } |
d7391698 LP |
484 | |
485 | new_value = (q->effective & m) ? CAP_SET : CAP_CLEAR; | |
486 | ||
487 | if (old_value != new_value) { | |
488 | changed = true; | |
489 | ||
490 | if (cap_set_flag(c, CAP_EFFECTIVE, 1, &cv, new_value) < 0) | |
491 | return -errno; | |
492 | } | |
493 | } | |
494 | } | |
495 | ||
9a2c5911 LP |
496 | if (changed) { |
497 | _cleanup_cap_free_ cap_t modified = NULL; | |
498 | ||
499 | /* In order to change the bounding caps, we need to keep CAP_SETPCAP for a bit | |
500 | * longer. Let's add it to our list hence for now. */ | |
501 | if (q->bounding != (uint64_t) -1) { | |
502 | cap_value_t cv = CAP_SETPCAP; | |
503 | ||
504 | modified = cap_dup(c); | |
505 | if (!modified) | |
506 | return -ENOMEM; | |
507 | ||
508 | if (cap_set_flag(modified, CAP_PERMITTED, 1, &cv, CAP_SET) < 0) | |
509 | return -errno; | |
510 | if (cap_set_flag(modified, CAP_EFFECTIVE, 1, &cv, CAP_SET) < 0) | |
511 | return -errno; | |
512 | ||
513 | if (cap_compare(modified, c) == 0) { | |
514 | /* No change? then drop this nonsense again */ | |
515 | cap_free(modified); | |
516 | modified = NULL; | |
517 | } | |
518 | } | |
519 | ||
520 | /* Now, let's enforce the caps for the first time. Note that this is where we acquire | |
521 | * caps in any of the sets we currently don't have. We have to do this before | |
522 | * droppoing the bounding caps below, since at that point we can never acquire new | |
523 | * caps in inherited/permitted/effective anymore, but only lose them.*/ | |
524 | if (cap_set_proc(modified ?: c) < 0) | |
d7391698 | 525 | return -errno; |
9a2c5911 LP |
526 | |
527 | need_set_proc_again = !!modified; | |
528 | } | |
d7391698 LP |
529 | } |
530 | ||
531 | if (q->bounding != (uint64_t) -1) { | |
532 | r = capability_bounding_set_drop(q->bounding, false); | |
533 | if (r < 0) | |
534 | return r; | |
535 | } | |
536 | ||
9a2c5911 LP |
537 | /* If needed, let's now set the caps again, this time in the final version, which differs from what |
538 | * we have already set only in the CAP_SETPCAP bit, which we needed for dropping the bounding | |
539 | * bits. This call only undoes bits and doesn't acquire any which means the bounding caps don't | |
540 | * matter. */ | |
541 | if (need_set_proc_again) | |
542 | if (cap_set_proc(c) < 0) | |
543 | return -errno; | |
544 | ||
d7391698 LP |
545 | return 0; |
546 | } |